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1. Rare variant contribution to the heritability of coronary artery disease

Author: Ghislain Rocheleau, Shoa L. Clarke, Gaëlle Auguste, Natalie R. Hasbani, Alanna C. Morrison, Adam S. Heath, Lawrence F. Bielak, Kruthika R. Iyer, Erica P. Young, Nathan O. Stitziel, Goo Jun, Cecelia Laurie, Jai G. Broome, Alyna T. Khan, Donna K. Arnett, Lewis C. Becker, Joshua C. Bis, Eric Boerwinkle, Donald W. Bowden, April P. Carson, Patrick T. Ellinor, Myriam Fornage, Nora Franceschini, Barry I. Freedman, Nancy L. Heard-Costa, Lifang Hou, Yii-Der Ida Chen, Eimear E. Kenny, Charles Kooperberg, Brian G. Kral, Ruth J. F. Loos, Sharon M. Lutz, JoAnn E. Manson, Lisa W. Martin, Braxton D. Mitchell, Rami Nassir, Nicholette D. Palmer, Wendy S. Post, Michael H. Preuss, Bruce M. Psaty, Laura M. Raffield, Elizabeth A. Regan, Stephen S. Rich, Jennifer A. Smith, Kent D. Taylor, Lisa R. Yanek, Kendra A. Young, NHLBI Trans-Omics for Precision Medicine (TOPMed) Consortium, Austin T. Hilliard, Catherine Tcheandjieu, Patricia A. Peyser, Ramachandran S. Vasan, Jerome I. Rotter, Clint L. Miller, Themistocles L. Assimes, Paul S. de Vries, and Ron Do
Subjects: Science
Abstract: Abstract Whole genome sequences (WGS) enable discovery of rare variants which may contribute to missing heritability of coronary artery disease (CAD). To measure their contribution, we apply the GREML-LDMS-I approach to WGS of 4949 cases and 17,494 controls of European ancestry from the NHLBI TOPMed program. We estimate CAD heritability at 34.3% assuming a prevalence of 8.2%. Ultra-rare (minor allele frequency ≤ 0.1%) variants with low linkage disequilibrium (LD) score contribute ~50% of the heritability. We also investigate CAD heritability enrichment using a diverse set of functional annotations: i) constraint; ii) predicted protein-altering impact; iii) cis-regulatory elements from a cell-specific chromatin atlas of the human coronary; and iv) annotation principal components representing a wide range of functional processes. We observe marked enrichment of CAD heritability for most functional annotations. These results reveal the predominant role of ultra-rare variants in low LD on the heritability of CAD. Moreover, they highlight several functional processes including cell type-specific regulatory mechanisms as key drivers of CAD genetic risk.
Published: 2024
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2. Validation of human telomere length multi-ancestry meta-analysis association signals identifies POP5 and KBTBD6 as human telomere length regulation genes

Author: Rebecca Keener, Surya B. Chhetri, Carla J. Connelly, Margaret A. Taub, Matthew P. Conomos, Joshua Weinstock, Bohan Ni, Benjamin Strober, Stella Aslibekyan, Paul L. Auer, Lucas Barwick, Lewis C. Becker, John Blangero, Eugene R. Bleecker, Jennifer A. Brody, Brian E. Cade, Juan C. Celedon, Yi-Cheng Chang, L. Adrienne Cupples, Brian Custer, Barry I. Freedman, Mark T. Gladwin, Susan R. Heckbert, Lifang Hou, Marguerite R. Irvin, Carmen R. Isasi, Jill M. Johnsen, Eimear E. Kenny, Charles Kooperberg, Ryan L. Minster, Take Naseri, Satupa’itea Viali, Sergei Nekhai, Nathan Pankratz, Patricia A. Peyser, Kent D. Taylor, Marilyn J. Telen, Baojun Wu, Lisa R. Yanek, Ivana V. Yang, Christine Albert, Donna K. Arnett, Allison E. Ashley-Koch, Kathleen C. Barnes, Joshua C. Bis, Thomas W. Blackwell, Eric Boerwinkle, Esteban G. Burchard, April P. Carson, Zhanghua Chen, Yii-Der Ida Chen, Dawood Darbar, Mariza de Andrade, Patrick T. Ellinor, Myriam Fornage, Bruce D. Gelb, Frank D. Gilliland, Jiang He, Talat Islam, Stefan Kaab, Sharon L. R. Kardia, Shannon Kelly, Barbara A. Konkle, Rajesh Kumar, Ruth J. F. Loos, Fernando D. Martinez, Stephen T. McGarvey, Deborah A. Meyers, Braxton D. Mitchell, Courtney G. Montgomery, Kari E. North, Nicholette D. Palmer, Juan M. Peralta, Benjamin A. Raby, Susan Redline, Stephen S. Rich, Dan Roden, Jerome I. Rotter, Ingo Ruczinski, David Schwartz, Frank Sciurba, M. Benjamin Shoemaker, Edwin K. Silverman, Moritz F. Sinner, Nicholas L. Smith, Albert V. Smith, Hemant K. Tiwari, Ramachandran S. Vasan, Scott T. Weiss, L. Keoki Williams, Yingze Zhang, Elad Ziv, Laura M. Raffield, Alexander P. Reiner, NHLBI Trans-Omics for Precision Medicine (TOPMed) Consortium, TOPMed Hematology and Hemostasis Working Group, TOPMed Structural Variation Working Group, Marios Arvanitis, Carol W. Greider, Rasika A. Mathias, and Alexis Battle
Subjects: Science
Abstract: Abstract Genome-wide association studies (GWAS) have become well-powered to detect loci associated with telomere length. However, no prior work has validated genes nominated by GWAS to examine their role in telomere length regulation. We conducted a multi-ancestry meta-analysis of 211,369 individuals and identified five novel association signals. Enrichment analyses of chromatin state and cell-type heritability suggested that blood/immune cells are the most relevant cell type to examine telomere length association signals. We validated specific GWAS associations by overexpressing KBTBD6 or POP5 and demonstrated that both lengthened telomeres. CRISPR/Cas9 deletion of the predicted causal regions in K562 blood cells reduced expression of these genes, demonstrating that these loci are related to transcriptional regulation of KBTBD6 and POP5. Our results demonstrate the utility of telomere length GWAS in the identification of telomere length regulation mechanisms and validate KBTBD6 and POP5 as genes affecting telomere length regulation.
Published: 2024
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3. Gene-educational attainment interactions in a multi-population genome-wide meta-analysis identify novel lipid loci

Author: Lisa de las Fuentes, Karen L. Schwander, Michael R. Brown, Amy R. Bentley, Thomas W. Winkler, Yun Ju Sung, Patricia B. Munroe, Clint L. Miller, Hugo Aschard, Stella Aslibekyan, Traci M. Bartz, Lawrence F. Bielak, Jin Fang Chai, Ching-Yu Cheng, Rajkumar Dorajoo, Mary F. Feitosa, Xiuqing Guo, Fernando P. Hartwig, Andrea Horimoto, Ivana Kolčić, Elise Lim, Yongmei Liu, Alisa K. Manning, Jonathan Marten, Solomon K. Musani, Raymond Noordam, Sandosh Padmanabhan, Tuomo Rankinen, Melissa A. Richard, Paul M. Ridker, Albert V. Smith, Dina Vojinovic, Alan B. Zonderman, Maris Alver, Mathilde Boissel, Kaare Christensen, Barry I. Freedman, Chuan Gao, Franco Giulianini, Sarah E. Harris, Meian He, Fang-Chi Hsu, Brigitte Kühnel, Federica Laguzzi, Xiaoyin Li, Leo-Pekka Lyytikäinen, Ilja M. Nolte, Alaitz Poveda, Rainer Rauramaa, Muhammad Riaz, Antonietta Robino, Tamar Sofer, Fumihiko Takeuchi, Bamidele O. Tayo, Peter J. van der Most, Niek Verweij, Erin B. Ware, Stefan Weiss, Wanqing Wen, Lisa R. Yanek, Yiqiang Zhan, Najaf Amin, Dan E. Arking, Christie Ballantyne, Eric Boerwinkle, Jennifer A. Brody, Ulrich Broeckel, Archie Campbell, Mickaël Canouil, Xiaoran Chai, Yii-Der Ida Chen, Xu Chen, Kumaraswamy Naidu Chitrala, Maria Pina Concas, Ulf de Faire, Renée de Mutsert, H. Janaka de Silva, Paul S. de Vries, Ahn Do, Jessica D. Faul, Virginia Fisher, James S. Floyd, Terrence Forrester, Yechiel Friedlander, Giorgia Girotto, C. Charles Gu, Göran Hallmans, Sami Heikkinen, Chew-Kiat Heng, Georg Homuth, Steven Hunt, M. Arfan Ikram, David R. Jacobs, Maryam Kavousi, Chiea Chuen Khor, Tuomas O. Kilpeläinen, Woon-Puay Koh, Pirjo Komulainen, Carl D. Langefeld, Jingjing Liang, Kiang Liu, Jianjun Liu, Kurt Lohman, Reedik Mägi, Ani W. Manichaikul, Colin A. McKenzie, Thomas Meitinger, Yuri Milaneschi, Matthias Nauck, Christopher P. Nelson, Jeffrey R. O’Connell, Nicholette D. Palmer, Alexandre C. Pereira, Thomas Perls, Annette Peters, Ozren Polašek, Olli T. Raitakari, Kenneth Rice, Treva K. Rice, Stephen S. Rich, Charumathi Sabanayagam, Pamela J. Schreiner, Xiao-Ou Shu, Stephen Sidney, Mario Sims, Jennifer A. Smith, John M. Starr, Konstantin Strauch, E. Shyong Tai, Kent D. Taylor, Michael Y. Tsai, André G. Uitterlinden, Diana van Heemst, Melanie Waldenberger, Ya-Xing Wang, Wen-Bin Wei, Gregory Wilson, Deng Xuan, Jie Yao, Caizheng Yu, Jian-Min Yuan, Wei Zhao, Diane M. Becker, Amélie Bonnefond, Donald W. Bowden, Richard S. Cooper, Ian J. Deary, Jasmin Divers, Tõnu Esko, Paul W. Franks, Philippe Froguel, Christian Gieger, Jost B. Jonas, Norihiro Kato, Timo A. Lakka, Karin Leander, Terho Lehtimäki, Patrik K. E. Magnusson, Kari E. North, Ioanna Ntalla, Brenda Penninx, Nilesh J. Samani, Harold Snieder, Beatrice Spedicati, Pim van der Harst, Henry Völzke, Lynne E. Wagenknecht, David R. Weir, Mary K. Wojczynski, Tangchun Wu, Wei Zheng, Xiaofeng Zhu, Claude Bouchard, Daniel I. Chasman, Michele K. Evans, Ervin R. Fox, Vilmundur Gudnason, Caroline Hayward, Bernardo L. Horta, Sharon L. R. Kardia, Jose Eduardo Krieger, Dennis O. Mook-Kanamori, Patricia A. Peyser, Michael M. Province, Bruce M. Psaty, Igor Rudan, Xueling Sim, Blair H. Smith, Rob M. van Dam, Cornelia M. van Duijn, Tien Yin Wong, Donna K. Arnett, Dabeeru C. Rao, James Gauderman, Ching-Ti Liu, Alanna C. Morrison, Jerome I. Rotter, and Myriam Fornage
Subjects: educational attainment, lipids, cholesterol, triglycerides, genome-wide association study, meta-analysis, Genetics, QH426-470
Abstract: Introduction: Educational attainment, widely used in epidemiologic studies as a surrogate for socioeconomic status, is a predictor of cardiovascular health outcomes.Methods: A two-stage genome-wide meta-analysis of low-density lipoprotein cholesterol (LDL), high-density lipoprotein cholesterol (HDL), and triglyceride (TG) levels was performed while accounting for gene-educational attainment interactions in up to 226,315 individuals from five population groups. We considered two educational attainment variables: “Some College” (yes/no, for any education beyond high school) and “Graduated College” (yes/no, for completing a 4-year college degree). Genome-wide significant (p < 5 × 10−8) and suggestive (p < 1 × 10−6) variants were identified in Stage 1 (in up to 108,784 individuals) through genome-wide analysis, and those variants were followed up in Stage 2 studies (in up to 117,531 individuals).Results: In combined analysis of Stages 1 and 2, we identified 18 novel lipid loci (nine for LDL, seven for HDL, and two for TG) by two degree-of-freedom (2 DF) joint tests of main and interaction effects. Four loci showed significant interaction with educational attainment. Two loci were significant only in cross-population analyses. Several loci include genes with known or suggested roles in adipose (FOXP1, MBOAT4, SKP2, STIM1, STX4), brain (BRI3, FILIP1, FOXP1, LINC00290, LMTK2, MBOAT4, MYO6, SENP6, SRGAP3, STIM1, TMEM167A, TMEM30A), and liver (BRI3, FOXP1) biology, highlighting the potential importance of brain-adipose-liver communication in the regulation of lipid metabolism. An investigation of the potential druggability of genes in identified loci resulted in five gene targets shown to interact with drugs approved by the Food and Drug Administration, including genes with roles in adipose and brain tissue.Discussion: Genome-wide interaction analysis of educational attainment identified novel lipid loci not previously detected by analyses limited to main genetic effects.
Published: 2023
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4. Whole genome sequence analysis of blood lipid levels in >66,000 individuals

Author: Margaret Sunitha Selvaraj, Xihao Li, Zilin Li, Akhil Pampana, David Y. Zhang, Joseph Park, Stella Aslibekyan, Joshua C. Bis, Jennifer A. Brody, Brian E. Cade, Lee-Ming Chuang, Ren-Hua Chung, Joanne E. Curran, Lisa de las Fuentes, Paul S. de Vries, Ravindranath Duggirala, Barry I. Freedman, Mariaelisa Graff, Xiuqing Guo, Nancy Heard-Costa, Bertha Hidalgo, Chii-Min Hwu, Marguerite R. Irvin, Tanika N. Kelly, Brian G. Kral, Leslie Lange, Xiaohui Li, Martin Lisa, Steven A. Lubitz, Ani W. Manichaikul, Preuss Michael, May E. Montasser, Alanna C. Morrison, Take Naseri, Jeffrey R. O’Connell, Nicholette D. Palmer, Patricia A. Peyser, Muagututia S. Reupena, Jennifer A. Smith, Xiao Sun, Kent D. Taylor, Russell P. Tracy, Michael Y. Tsai, Zhe Wang, Yuxuan Wang, Wei Bao, John T. Wilkins, Lisa R. Yanek, Wei Zhao, Donna K. Arnett, John Blangero, Eric Boerwinkle, Donald W. Bowden, Yii-Der Ida Chen, Adolfo Correa, L. Adrienne Cupples, Susan K. Dutcher, Patrick T. Ellinor, Myriam Fornage, Stacey Gabriel, Soren Germer, Richard Gibbs, Jiang He, Robert C. Kaplan, Sharon L. R. Kardia, Ryan Kim, Charles Kooperberg, Ruth J. F. Loos, Karine A Viaud-Martinez, Rasika A. Mathias, Stephen T. McGarvey, Braxton D. Mitchell, Deborah Nickerson, Kari E. North, Bruce M. Psaty, Susan Redline, Alexander P. Reiner, Ramachandran S. Vasan, Stephen S. Rich, Cristen Willer, Jerome I. Rotter, Daniel J. Rader, Xihong Lin, NHLBI Trans-Omics for Precision Medicine (TOPMed) Consortium, Gina M. Peloso, and Pradeep Natarajan
Subjects: Science
Abstract: Although the common genetic variants contributing to blood lipid levels have been studied, the contribution of rare variants is less understood. Here, the authors perform a rare coding and noncoding variant association study of blood lipid levels using whole genome sequencing data.
Published: 2022
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5. Differential and shared genetic effects on kidney function between diabetic and non-diabetic individuals

Author: Thomas W. Winkler, Humaira Rasheed, Alexander Teumer, Mathias Gorski, Bryce X. Rowan, Kira J. Stanzick, Laurent F. Thomas, Adrienne Tin, Anselm Hoppmann, Audrey Y. Chu, Bamidele Tayo, Chris H. L. Thio, Daniele Cusi, Jin-Fang Chai, Karsten B. Sieber, Katrin Horn, Man Li, Markus Scholz, Massimiliano Cocca, Matthias Wuttke, Peter J. van der Most, Qiong Yang, Sahar Ghasemi, Teresa Nutile, Yong Li, Giulia Pontali, Felix Günther, Abbas Dehghan, Adolfo Correa, Afshin Parsa, Agnese Feresin, Aiko P. J. de Vries, Alan B. Zonderman, Albert V. Smith, Albertine J. Oldehinkel, Alessandro De Grandi, Alexander R. Rosenkranz, Andre Franke, Andrej Teren, Andres Metspalu, Andrew A. Hicks, Andrew P. Morris, Anke Tönjes, Anna Morgan, Anna I. Podgornaia, Annette Peters, Antje Körner, Anubha Mahajan, Archie Campbell, Barry I. Freedman, Beatrice Spedicati, Belen Ponte, Ben Schöttker, Ben Brumpton, Bernhard Banas, Bernhard K. Krämer, Bettina Jung, Bjørn Olav Åsvold, Blair H. Smith, Boting Ning, Brenda W. J. H. Penninx, Brett R. Vanderwerff, Bruce M. Psaty, Candace M. Kammerer, Carl D. Langefeld, Caroline Hayward, Cassandra N. Spracklen, Cassianne Robinson-Cohen, Catharina A. Hartman, Cecilia M. Lindgren, Chaolong Wang, Charumathi Sabanayagam, Chew-Kiat Heng, Chiara Lanzani, Chiea-Chuen Khor, Ching-Yu Cheng, Christian Fuchsberger, Christian Gieger, Christian M. Shaffer, Christina-Alexandra Schulz, Cristen J. Willer, Daniel I. Chasman, Daniel F. Gudbjartsson, Daniela Ruggiero, Daniela Toniolo, Darina Czamara, David J. Porteous, Dawn M. Waterworth, Deborah Mascalzoni, Dennis O. Mook-Kanamori, Dermot F. Reilly, E. Warwick Daw, Edith Hofer, Eric Boerwinkle, Erika Salvi, Erwin P. Bottinger, E-Shyong Tai, Eulalia Catamo, Federica Rizzi, Feng Guo, Fernando Rivadeneira, Franco Guilianini, Gardar Sveinbjornsson, Georg Ehret, Gerard Waeber, Ginevra Biino, Giorgia Girotto, Giorgio Pistis, Girish N. Nadkarni, Graciela E. Delgado, Grant W. Montgomery, Harold Snieder, Harry Campbell, Harvey D. White, He Gao, Heather M. Stringham, Helena Schmidt, Hengtong Li, Hermann Brenner, Hilma Holm, Holgen Kirsten, Holly Kramer, Igor Rudan, Ilja M. Nolte, Ioanna Tzoulaki, Isleifur Olafsson, Jade Martins, James P. Cook, James F. Wilson, Jan Halbritter, Janine F. Felix, Jasmin Divers, Jaspal S. Kooner, Jeannette Jen-Mai Lee, Jeffrey O’Connell, Jerome I. Rotter, Jianjun Liu, Jie Xu, Joachim Thiery, Johan Ärnlöv, Johanna Kuusisto, Johanna Jakobsdottir, Johanne Tremblay, John C. Chambers, John B. Whitfield, John M. Gaziano, Jonathan Marten, Josef Coresh, Jost B. Jonas, Josyf C. Mychaleckyj, Kaare Christensen, Kai-Uwe Eckardt, Karen L. Mohlke, Karlhans Endlich, Katalin Dittrich, Kathleen A. Ryan, Kenneth M. Rice, Kent D. Taylor, Kevin Ho, Kjell Nikus, Koichi Matsuda, Konstantin Strauch, Kozeta Miliku, Kristian Hveem, Lars Lind, Lars Wallentin, Laura M. Yerges-Armstrong, Laura M. Raffield, Lawrence S. Phillips, Lenore J. Launer, Leo-Pekka Lyytikäinen, Leslie A. Lange, Lorena Citterio, Lucija Klaric, M. Arfan Ikram, Marcus Ising, Marcus E. Kleber, Margherita Francescatto, Maria Pina Concas, Marina Ciullo, Mario Piratsu, Marju Orho-Melander, Markku Laakso, Markus Loeffler, Markus Perola, Martin H. de Borst, Martin Gögele, Martina La Bianca, Mary Ann Lukas, Mary F. Feitosa, Mary L. Biggs, Mary K. Wojczynski, Maryam Kavousi, Masahiro Kanai, Masato Akiyama, Masayuki Yasuda, Matthias Nauck, Melanie Waldenberger, Miao-Li Chee, Miao-Ling Chee, Michael Boehnke, Michael H. Preuss, Michael Stumvoll, Michael A. Province, Michele K. Evans, Michelle L. O’Donoghue, Michiaki Kubo, Mika Kähönen, Mika Kastarinen, Mike A. Nalls, Mikko Kuokkanen, Mohsen Ghanbari, Murielle Bochud, Navya Shilpa Josyula, Nicholas G. Martin, Nicholas Y. Q. Tan, Nicholette D. Palmer, Nicola Pirastu, Nicole Schupf, Niek Verweij, Nina Hutri-Kähönen, Nina Mononen, Nisha Bansal, Olivier Devuyst, Olle Melander, Olli T. Raitakari, Ozren Polasek, Paolo Manunta, Paolo Gasparini, Pashupati P. Mishra, Patrick Sulem, Patrik K. E. Magnusson, Paul Elliott, Paul M. Ridker, Pavel Hamet, Per O. Svensson, Peter K. Joshi, Peter Kovacs, Peter P. Pramstaller, Peter Rossing, Peter Vollenweider, Pim van der Harst, Rajkumar Dorajoo, Ralene Z. H. Sim, Ralph Burkhardt, Ran Tao, Raymond Noordam, Reedik Mägi, Reinhold Schmidt, Renée de Mutsert, Rico Rueedi, Rob M. van Dam, Robert J. Carroll, Ron T. Gansevoort, Ruth J. F. Loos, Sala Cinzia Felicita, Sanaz Sedaghat, Sandosh Padmanabhan, Sandra Freitag-Wolf, Sarah A. Pendergrass, Sarah E. Graham, Scott D. Gordon, Shih-Jen Hwang, Shona M. Kerr, Simona Vaccargiu, Snehal B. Patil, Stein Hallan, Stephan J. L. Bakker, Su-Chi Lim, Susanne Lucae, Suzanne Vogelezang, Sven Bergmann, Tanguy Corre, Tarunveer S. Ahluwalia, Terho Lehtimäki, Thibaud S. Boutin, Thomas Meitinger, Tien-Yin Wong, Tobias Bergler, Ton J. Rabelink, Tõnu Esko, Toomas Haller, Unnur Thorsteinsdottir, Uwe Völker, Valencia Hui Xian Foo, Veikko Salomaa, Veronique Vitart, Vilmantas Giedraitis, Vilmundur Gudnason, Vincent W. V. Jaddoe, Wei Huang, Weihua Zhang, Wen Bin Wei, Wieland Kiess, Winfried März, Wolfgang Koenig, Wolfgang Lieb, Xin Gao, Xueling Sim, Ya Xing Wang, Yechiel Friedlander, Yih-Chung Tham, Yoichiro Kamatani, Yukinori Okada, Yuri Milaneschi, Zhi Yu, Lifelines cohort study, DiscovEHR/MyCode study, VA Million Veteran Program, Klaus J. Stark, Kari Stefansson, Carsten A. Böger, Adriana M. Hung, Florian Kronenberg, Anna Köttgen, Cristian Pattaro, and Iris M. Heid
Subjects: Biology (General), QH301-705.5
Abstract: A large-scale GWAS provides insight on diabetes-dependent genetic effects on the glomerular filtration rate, a common metric to monitor kidney health in disease.
Published: 2022
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6. Employment status at transplant influences ethnic disparities in outcomes after deceased donor kidney transplantation

Author: Jasmin Divers, Sumit Mohan, W. Mark Brown, Stephen O. Pastan, Ajay K. Israni, Robert S. Gaston, Robert Bray, Shahidul Islam, Natalia V. Sakhovskaya, Alejandra M. Mena-Gutierrez, Amber M. Reeves-Daniel, Bruce A. Julian, and Barry I. Freedman
Subjects: Deceased donor kidney transplantation, Allograft failure, Kidney recipient mortality, Outcome disparity, Employment status, Diseases of the genitourinary system. Urology, RC870-923
Abstract: Abstract Background African American (AA) recipients of deceased-donor (DD) kidney transplants (KT) have shorter allograft survival than recipients of other ethnic groups. Reasons for this disparity encompass complex interactions between donors and recipients characteristics. Methods Outcomes from 3872 AA and 19,719 European American (EA) DDs who had one kidney transplanted in an AA recipient and one in an EA recipient were analyzed. Four donor/recipient pair groups (DRP) were studied, AA/AA, AA/EA, EA/AA, and EA/EA. Survival random forests and Cox proportional hazard models were fitted to rank and evaluate modifying effects of DRP on variables associated with allograft survival. These analyses sought to identify factors contributing to the observed disparities in transplant outcomes among AA and EA DDKT recipients. Results Transplant era, discharge serum creatinine, delayed graft function, and DRP were among the top predictors of allograft survival and mortality among DDKT recipients. Interaction effects between DRP with the kidney donor risk index and transplant era showed significant improvement in allograft survival over time in EA recipients. However, AA recipients appeared to have similar or poorer outcomes for DDKT performed after 2010 versus before 2001; allograft survival hazard ratios (95% CI) were 1.15 (0.74, 1.76) and 1.07 (0.8, 1.45) for AA/AA and EA/AA, compared to 0.62 (0.54, 0.71) and 0.5 (0.41, 0.62) for EA/EA and AA/EA DRP, respectively. Recipient mortality improved over time among all DRP, except unemployed AA/AAs. Relative to DDKT performed pre-2001, employed AA/AAs had HR = 0.37 (0.2, 0.69) versus 0.59 (0.31, 1.11) for unemployed AA/AA after 2010. Conclusion Relative to DDKT performed before 2001, similar or worse overall DCAS was observed among AA/AAs, while EA/EAs experienced considerable improvement regardless of employment status, KDRI, and EPTS. AA recipients of an AA DDKT, especially if unemployed, had worse allograft survival and mortality and did not appear to benefit from advances in care over the past 20 years.
Published: 2022
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7. PTH-Related Protein Assays in Advanced Kidney Disease: Implications for Evaluation of Hypercalcemia

Author: Jobira A. Woldemichael, Andres D. Pirela, and Barry I. Freedman
Subjects: Diseases of the genitourinary system. Urology, RC870-923
Abstract: Hypercalcemia is a common and potentially serious electrolyte abnormality that is often observed in patients with chronic kidney disease (CKD). When malignancy is considered, parathyroid hormone-related protein (PTHrP) levels are often measured. PTHrP is produced by cancer cells and mimics the effects of parathyroid hormone (PTH) to elevate serum calcium concentrations. The amino and carboxy termini of PTHrP are of functional relevance. C-terminal PTHrP levels accumulate with CKD and can be elevated in normocalcemic CKD patients who lack malignancy. The existence of amino (N)-terminal and carboxy (C)-terminal PTHrP assays and how their concentrations are impacted by CKD are reviewed herein. The case of a patient on maintenance hemodialysis who developed prolonged hypercalcemia with elevated PTHrP concentrations is presented. The workup revealed suppressed intact PTH, low 25-hydroxyvitamin D, and 1,25-dihydroxyvitamin D levels. The initial PTHrP assay returned elevated. However, it was unappreciated that it was the C-terminal assay and the patient underwent an unnecessary search for malignancy. A subsequent N-terminal PTHrP assay returned within the normal range. Many commercial labs run the C-terminal PTHrP assay as their first-line test. This can lead to inaccurate differential diagnoses in hypercalcemic patients with CKD. We emphasize the need to specifically request N-terminal PTHrP assays in patients with advanced kidney disease when humoral hypercalcemia of malignancy is suspected.
Published: 2023
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8. Plasma metabolomic profiling in subclinical atherosclerosis: the Diabetes Heart Study

Author: Parag Anilkumar Chevli, Barry I. Freedman, Fang-Chi Hsu, Jianzhao Xu, Megan E. Rudock, Lijun Ma, John S. Parks, Nicholette D. Palmer, and Michael D. Shapiro
Subjects: Diabetes mellitus, Cardiovascular disease, Coronary artery calcium, Metabolomics, African Americans, European Americans, Diseases of the circulatory (Cardiovascular) system, RC666-701
Abstract: Abstract Background Incidence rates of cardiovascular disease (CVD) are increasing, partly driven by the diabetes epidemic. Novel prediction tools and modifiable treatment targets are needed to enhance risk assessment and management. Plasma metabolite associations with subclinical atherosclerosis were investigated in the Diabetes Heart Study (DHS), a cohort enriched for type 2 diabetes (T2D). Methods The analysis included 700 DHS participants, 438 African Americans (AAs), and 262 European Americans (EAs), in whom coronary artery calcium (CAC) was assessed using ECG-gated computed tomography. Plasma metabolomics using liquid chromatography-mass spectrometry identified 853 known metabolites. An ancestry-specific marginal model incorporating generalized estimating equations examined associations between metabolites and CAC (log-transformed (CAC + 1) as outcome measure). Models were adjusted for age, sex, BMI, diabetes duration, date of plasma collection, time between plasma collection and CT exam, low-density lipoprotein cholesterol (LDL-C), and statin use. Results At an FDR-corrected p-value
Published: 2021
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9. Chromosome Xq23 is associated with lower atherogenic lipid concentrations and favorable cardiometabolic indices

Author: Pradeep Natarajan, Akhil Pampana, Sarah E. Graham, Sanni E. Ruotsalainen, James A. Perry, Paul S. de Vries, Jai G. Broome, James P. Pirruccello, Michael C. Honigberg, Krishna Aragam, Brooke Wolford, Jennifer A. Brody, Lucinda Antonacci-Fulton, Moscati Arden, Stella Aslibekyan, Themistocles L. Assimes, Christie M. Ballantyne, Lawrence F. Bielak, Joshua C. Bis, Brian E. Cade, Ron Do, Harsha Doddapaneni, Leslie S. Emery, Yi-Jen Hung, Marguerite R. Irvin, Alyna T. Khan, Leslie Lange, Jiwon Lee, Rozenn N. Lemaitre, Lisa W. Martin, Ginger Metcalf, May E. Montasser, Jee-Young Moon, Donna Muzny, Jeffrey R. O’Connell, Nicholette D. Palmer, Juan M. Peralta, Patricia A. Peyser, Adrienne M. Stilp, Michael Tsai, Fei Fei Wang, Daniel E. Weeks, Lisa R. Yanek, James G. Wilson, Goncalo Abecasis, Donna K. Arnett, Lewis C. Becker, John Blangero, Eric Boerwinkle, Donald W. Bowden, Yi-Cheng Chang, Yii-Der I. Chen, Won Jung Choi, Adolfo Correa, Joanne E. Curran, Mark J. Daly, Susan K. Dutcher, Patrick T. Ellinor, Myriam Fornage, Barry I. Freedman, Stacey Gabriel, Soren Germer, Richard A. Gibbs, Jiang He, Kristian Hveem, Gail P. Jarvik, Robert C. Kaplan, Sharon L. R. Kardia, Eimear Kenny, Ryan W. Kim, Charles Kooperberg, Cathy C. Laurie, Seonwook Lee, Don M. Lloyd-Jones, Ruth J. F. Loos, Steven A. Lubitz, Rasika A. Mathias, Karine A. Viaud Martinez, Stephen T. McGarvey, Braxton D. Mitchell, Deborah A. Nickerson, Kari E. North, Aarno Palotie, Cheol Joo Park, Bruce M. Psaty, D. C. Rao, Susan Redline, Alexander P. Reiner, Daekwan Seo, Jeong-Sun Seo, Albert V. Smith, Russell P. Tracy, Ramachandran S. Vasan, Sekar Kathiresan, L. Adrienne Cupples, Jerome I. Rotter, Alanna C. Morrison, Stephen S. Rich, Samuli Ripatti, Cristen Willer, NHLBI Trans-Omics for Precision Medicine (TOPMed) Consortium, FinnGen, and Gina M. Peloso
Subjects: Science
Abstract: The influence of X chromosome genetic variation on blood lipids and coronary heart disease (CHD) is not well understood. Here, the authors analyse X chromosome sequencing data across 65,322 multi-ancestry individuals, identifying associations of the Xq23 locus with lipid changes and reduced risk of CHD and diabetes mellitus.
Published: 2021
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10. Intensive Blood Pressure Control, APOL1 Genotype, and Kidney Outcomes in Individuals With Type 2 Diabetes: A Post Hoc Analysis of the Action to Control Cardiovascular Risk in Diabetes-Blood Pressure (ACCORD-BP) Trial

Author: Alex Dinh, MD, Timothy Copeland, PhD, Barry I. Freedman, MD, Charles E. McCulloch, PhD, and Elaine Ku, MD, MAS
Subjects: Diseases of the genitourinary system. Urology, RC870-923
Published: 2021
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11. A randomized pilot study to evaluate graft versus fistula vascular access strategy in older patients with advanced kidney disease: results of a feasibility study

Author: Mariana Murea, Randolph L. Geary, Denise K. Houston, Matthew S. Edwards, Todd W. Robinson, Ross P. Davis, Justin B. Hurie, Timothy K. Williams, Gabriela Velazquez-Ramirez, Benjamin Bagwell, Audrey B. Tuttle, Shahriar Moossavi, Michael V. Rocco, Barry I. Freedman, Jeff D. Williamson, Haiying Chen, and Jasmin Divers
Subjects: Arteriovenous vascular access, Hemodialysis, Kidney disease, Older adults, Randomized trial, Medicine (General), R5-920
Abstract: Abstract Background Although older adults encompass almost half of patients with advanced chronic kidney disease, it remains unclear which long-term hemodialysis vascular access type, arteriovenous fistula or arteriovenous graft, is optimal with respect to effectiveness and patient satisfaction. Clinical outcomes based on the initial AV access type have not been evaluated in randomized controlled trials. This pilot study tested the feasibility of randomizing older adults with advanced kidney disease to initial arteriovenous fistula versus graft vascular access surgery. Methods Patients 65 years or older with pre-dialysis chronic kidney disease or incident end-stage kidney disease and no prior arteriovenous vascular access intervention were randomized in a 1:1 ratio to undergo surgical placement of a fistula or a graft after providing informed consent. Trial feasibility was evaluated as (i) recruitment of ≥ 70% of eligible participants, (ii) ≥ 50 to 70% of participants undergo placement of index arteriovenous access within 90 to 180 days of enrollment, respectively, (iii) ≥ 80% adherence to study-related assessments, and (iv) ≥ 70% of participants who underwent index arteriovenous access placement will have a follow-up duration of ≥ 12 months after index surgery date. Results Between September 2018 and October 2019, 81% (44/54) of eligible participants consented and were enrolled in the study; 11 had pre-dialysis chronic kidney disease, and 33 had incident or prevalent end-stage kidney disease. After randomization, 100% (21/21) assigned to arteriovenous fistula surgery and 78% (18/23) assigned to arteriovenous graft surgery underwent index arteriovenous access placement within a median (1st, 3rd quartile) of 5.0 (1.0, 14.0) days and 13.0 (5.0, 44.3) days, respectively, after referral to vascular surgery. The completion rates for study-specific assessments ranged between 40.0 and 88.6%. At median follow-up of 215.0 days, 5 participants expired, 7 completed 12 months of follow-up, and 29 are actively being followed. Assessments of grip strength, functional independence, and vascular access satisfaction were completed by > 85% of patients who reached pre-specified post-operative assessment time point. Conclusions Results from this study reveal it is feasible to enroll and randomize older adults with advanced kidney disease to one of two different arteriovenous vascular access placement surgeries. The study can progress with minor protocol adjustments to a multisite clinical trial. Trial registration Clinical Trials ID, NCT03545113 .
Published: 2020
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12. APOL1 Long-term Kidney Transplantation Outcomes Network (APOLLO): Design and Rationale

Author: Barry I. Freedman, Marva M. Moxey-Mims, Amir A. Alexander, Brad C. Astor, Kelly A. Birdwell, Donald W. Bowden, Gordon Bowen, Jonathan Bromberg, Timothy E. Craven, Darshana M. Dadhania, Jasmin Divers, Mona D. Doshi, Elling Eidbo, Alessia Fornoni, Michael D. Gautreaux, Rasheed A. Gbadegesin, Patrick O. Gee, Giselle Guerra, Chi-yuan Hsu, Ana S. Iltis, Nichole Jefferson, Bruce A. Julian, David K. Klassen, Patrick P. Koty, Carl D. Langefeld, Krista L. Lentine, Lijun Ma, Roslyn B. Mannon, Madhav C. Menon, Sumit Mohan, J. Brian Moore, Barbara Murphy, Kenneth A. Newell, Jonah Odim, Mariella Ortigosa-Goggins, Nicholette D. Palmer, Meyeon Park, Afshin Parsa, Stephen O. Pastan, Emilio D. Poggio, Nishadi Rajapakse, Amber M. Reeves-Daniel, Sylvia E. Rosas, Laurie P. Russell, Deirdre Sawinski, S. Carrie Smith, Mitzie Spainhour, Robert J. Stratta, Matthew R. Weir, David M. Reboussin, Paul L. Kimmel, and Daniel C. Brennan
Subjects: Diseases of the genitourinary system. Urology, RC870-923
Abstract: Introduction: Much of the higher risk for end-stage kidney disease (ESKD) in African American individuals relates to ancestry-specific variation in the apolipoprotein L1 gene (APOL1). Relative to kidneys from European American deceased-donors, kidneys from African American deceased-donors have shorter allograft survival and African American living-kidney donors more often develop ESKD. The National Institutes of Health (NIH)–sponsored APOL1 Long-term Kidney Transplantation Outcomes Network (APOLLO) is prospectively assessing kidney allograft survival from donors with recent African ancestry based on donor and recipient APOL1 genotypes. Methods: APOLLO will evaluate outcomes from 2614 deceased kidney donor-recipient pairs, as well as additional living-kidney donor-recipient pairs and unpaired deceased-donor kidneys. Results: The United Network for Organ Sharing (UNOS), Association of Organ Procurement Organizations, American Society of Transplantation, American Society for Histocompatibility and Immunogenetics, and nearly all U.S. kidney transplant programs, organ procurement organizations (OPOs), and histocompatibility laboratories are participating in this observational study. APOLLO employs a central institutional review board (cIRB) and maintains voluntary partnerships with OPOs and histocompatibility laboratories. A Community Advisory Council composed of African American individuals with a personal or family history of kidney disease has advised the NIH Project Office and Steering Committee since inception. UNOS is providing data for outcome analyses. Conclusion: This article describes unique aspects of the protocol, design, and performance of APOLLO. Results will guide use of APOL1 genotypic data to improve the assessment of quality in deceased-donor kidneys and could increase numbers of transplanted kidneys, reduce rates of discard, and improve the safety of living-kidney donation. Keywords: African Americans, APOL1, chronic kidney disease, graft failure, kidney transplantation, outcomes
Published: 2020
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13. Genetic determinants of telomere length from 109,122 ancestrally diverse whole-genome sequences in TOPMed

Author: Margaret A. Taub, Matthew P. Conomos, Rebecca Keener, Kruthika R. Iyer, Joshua S. Weinstock, Lisa R. Yanek, John Lane, Tyne W. Miller-Fleming, Jennifer A. Brody, Laura M. Raffield, Caitlin P. McHugh, Deepti Jain, Stephanie M. Gogarten, Cecelia A. Laurie, Ali Keramati, Marios Arvanitis, Albert V. Smith, Benjamin Heavner, Lucas Barwick, Lewis C. Becker, Joshua C. Bis, John Blangero, Eugene R. Bleecker, Esteban G. Burchard, Juan C. Celedón, Yen Pei C. Chang, Brian Custer, Dawood Darbar, Lisa de las Fuentes, Dawn L. DeMeo, Barry I. Freedman, Melanie E. Garrett, Mark T. Gladwin, Susan R. Heckbert, Bertha A. Hidalgo, Marguerite R. Irvin, Talat Islam, W. Craig Johnson, Stefan Kaab, Lenore Launer, Jiwon Lee, Simin Liu, Arden Moscati, Kari E. North, Patricia A. Peyser, Nicholas Rafaels, Christine Seidman, Daniel E. Weeks, Fayun Wen, Marsha M. Wheeler, L. Keoki Williams, Ivana V. Yang, Wei Zhao, Stella Aslibekyan, Paul L. Auer, Donald W. Bowden, Brian E. Cade, Zhanghua Chen, Michael H. Cho, L. Adrienne Cupples, Joanne E. Curran, Michelle Daya, Ranjan Deka, Celeste Eng, Tasha E. Fingerlin, Xiuqing Guo, Lifang Hou, Shih-Jen Hwang, Jill M. Johnsen, Eimear E. Kenny, Albert M. Levin, Chunyu Liu, Ryan L. Minster, Take Naseri, Mehdi Nouraie, Muagututi‘a Sefuiva Reupena, Ester C. Sabino, Jennifer A. Smith, Nicholas L. Smith, Jessica Lasky-Su, James G. Taylor, VI, Marilyn J. Telen, Hemant K. Tiwari, Russell P. Tracy, Marquitta J. White, Yingze Zhang, Kerri L. Wiggins, Scott T. Weiss, Ramachandran S. Vasan, Kent D. Taylor, Moritz F. Sinner, Edwin K. Silverman, M. Benjamin Shoemaker, Wayne H.-H. Sheu, Frank Sciurba, David A. Schwartz, Jerome I. Rotter, Daniel Roden, Susan Redline, Benjamin A. Raby, Bruce M. Psaty, Juan M. Peralta, Nicholette D. Palmer, Sergei Nekhai, Courtney G. Montgomery, Braxton D. Mitchell, Deborah A. Meyers, Stephen T. McGarvey, Angel C.Y. Mak, Ruth J.F. Loos, Rajesh Kumar, Charles Kooperberg, Barbara A. Konkle, Shannon Kelly, Sharon L.R. Kardia, Robert Kaplan, Jiang He, Hongsheng Gui, Frank D. Gilliland, Bruce D. Gelb, Myriam Fornage, Patrick T. Ellinor, Mariza de Andrade, Adolfo Correa, Yii-Der Ida Chen, Eric Boerwinkle, Kathleen C. Barnes, Allison E. Ashley-Koch, Donna K. Arnett, Christine Albert, Cathy C. Laurie, Goncalo Abecasis, Deborah A. Nickerson, James G. Wilson, Stephen S. Rich, Daniel Levy, Ingo Ruczinski, Abraham Aviv, Thomas W. Blackwell, Timothy Thornton, Jeff O’Connell, Nancy J. Cox, James A. Perry, Mary Armanios, Alexis Battle, Nathan Pankratz, Alexander P. Reiner, and Rasika A. Mathias
Subjects: telomeres, telomere length genetics, trans-population genome-wide association study, Genetics, QH426-470, Internal medicine, RC31-1245
Abstract: Summary: Genetic studies on telomere length are important for understanding age-related diseases. Prior GWASs for leukocyte TL have been limited to European and Asian populations. Here, we report the first sequencing-based association study for TL across ancestrally diverse individuals (European, African, Asian, and Hispanic/Latino) from the NHLBI Trans-Omics for Precision Medicine (TOPMed) program. We used whole-genome sequencing (WGS) of whole blood for variant genotype calling and the bioinformatic estimation of telomere length in n = 109,122 individuals. We identified 59 sentinel variants (p < 5 × 10−9) in 36 loci associated with telomere length, including 20 newly associated loci (13 were replicated in external datasets). There was little evidence of effect size heterogeneity across populations. Fine-mapping at OBFC1 indicated that the independent signals colocalized with cell-type-specific eQTLs for OBFC1 (STN1). Using a multi-variant gene-based approach, we identified two genes newly implicated in telomere length, DCLRE1B (SNM1B) and PARN. In PheWAS, we demonstrated that our TL polygenic trait scores (PTSs) were associated with an increased risk of cancer-related phenotypes.
Published: 2022
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14. 1510 Predicting risk of severe lupus nephritis in African Americans: the APOL1 story

Author: Barry I Freedman
Subjects: Immunologic diseases. Allergy, RC581-607
Published: 2021
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15. Associations of autozygosity with a broad range of human phenotypes

Author: David W Clark, Yukinori Okada, Kristjan H S Moore, Dan Mason, Nicola Pirastu, Ilaria Gandin, Hannele Mattsson, Catriona L K Barnes, Kuang Lin, Jing Hua Zhao, Patrick Deelen, Rebecca Rohde, Claudia Schurmann, Xiuqing Guo, Franco Giulianini, Weihua Zhang, Carolina Medina-Gomez, Robert Karlsson, Yanchun Bao, Traci M Bartz, Clemens Baumbach, Ginevra Biino, Matthew J Bixley, Marco Brumat, Jin-Fang Chai, Tanguy Corre, Diana L Cousminer, Annelot M Dekker, David A Eccles, Kristel R van Eijk, Christian Fuchsberger, He Gao, Marine Germain, Scott D Gordon, Hugoline G de Haan, Sarah E Harris, Edith Hofer, Alicia Huerta-Chagoya, Catherine Igartua, Iris E Jansen, Yucheng Jia, Tim Kacprowski, Torgny Karlsson, Marcus E Kleber, Shengchao Alfred Li, Ruifang Li-Gao, Anubha Mahajan, Koichi Matsuda, Karina Meidtner, Weihua Meng, May E Montasser, Peter J van der Most, Matthias Munz, Teresa Nutile, Teemu Palviainen, Gauri Prasad, Rashmi B Prasad, Tallapragada Divya Sri Priyanka, Federica Rizzi, Erika Salvi, Bishwa R Sapkota, Daniel Shriner, Line Skotte, Melissa C Smart, Albert Vernon Smith, Ashley van der Spek, Cassandra N Spracklen, Rona J Strawbridge, Salman M Tajuddin, Stella Trompet, Constance Turman, Niek Verweij, Clara Viberti, Lihua Wang, Helen R Warren, Robyn E Wootton, Lisa R Yanek, Jie Yao, Noha A Yousri, Wei Zhao, Adebowale A Adeyemo, Saima Afaq, Carlos Alberto Aguilar-Salinas, Masato Akiyama, Matthew L Albert, Matthew A Allison, Maris Alver, Tin Aung, Fereidoun Azizi, Amy R Bentley, Heiner Boeing, Eric Boerwinkle, Judith B Borja, Gert J de Borst, Erwin P Bottinger, Linda Broer, Harry Campbell, Stephen Chanock, Miao-Li Chee, Guanjie Chen, Yii-Der I Chen, Zhengming Chen, Yen-Feng Chiu, Massimiliano Cocca, Francis S Collins, Maria Pina Concas, Janie Corley, Giovanni Cugliari, Rob M van Dam, Anna Damulina, Maryam S Daneshpour, Felix R Day, Graciela E Delgado, Klodian Dhana, Alexander S F Doney, Marcus Dörr, Ayo P Doumatey, Nduna Dzimiri, S Sunna Ebenesersdóttir, Joshua Elliott, Paul Elliott, Ralf Ewert, Janine F Felix, Krista Fischer, Barry I Freedman, Giorgia Girotto, Anuj Goel, Martin Gögele, Mark O Goodarzi, Mariaelisa Graff, Einat Granot-Hershkovitz, Francine Grodstein, Simonetta Guarrera, Daniel F Gudbjartsson, Kamran Guity, Bjarni Gunnarsson, Yu Guo, Saskia P Hagenaars, Christopher A Haiman, Avner Halevy, Tamara B Harris, Mehdi Hedayati, David A van Heel, Makoto Hirata, Imo Höfer, Chao Agnes Hsiung, Jinyan Huang, Yi-Jen Hung, M Arfan Ikram, Anuradha Jagadeesan, Pekka Jousilahti, Yoichiro Kamatani, Masahiro Kanai, Nicola D Kerrison, Thorsten Kessler, Kay-Tee Khaw, Chiea Chuen Khor, Dominique P V de Kleijn, Woon-Puay Koh, Ivana Kolcic, Peter Kraft, Bernhard K Krämer, Zoltán Kutalik, Johanna Kuusisto, Claudia Langenberg, Lenore J Launer, Deborah A Lawlor, I-Te Lee, Wen-Jane Lee, Markus M Lerch, Liming Li, Jianjun Liu, Marie Loh, Stephanie J London, Stephanie Loomis, Yingchang Lu, Jian’an Luan, Reedik Mägi, Ani W Manichaikul, Paolo Manunta, Gísli Másson, Nana Matoba, Xue W Mei, Christa Meisinger, Thomas Meitinger, Massimo Mezzavilla, Lili Milani, Iona Y Millwood, Yukihide Momozawa, Amy Moore, Pierre-Emmanuel Morange, Hortensia Moreno-Macías, Trevor A Mori, Alanna C Morrison, Taulant Muka, Yoshinori Murakami, Alison D Murray, Renée de Mutsert, Josyf C Mychaleckyj, Mike A Nalls, Matthias Nauck, Matt J Neville, Ilja M Nolte, Ken K Ong, Lorena Orozco, Sandosh Padmanabhan, Gunnar Pálsson, James S Pankow, Cristian Pattaro, Alison Pattie, Ozren Polasek, Neil Poulter, Peter P Pramstaller, Lluis Quintana-Murci, Katri Räikkönen, Sarju Ralhan, Dabeeru C Rao, Wouter van Rheenen, Stephen S Rich, Paul M Ridker, Cornelius A Rietveld, Antonietta Robino, Frank J A van Rooij, Daniela Ruggiero, Yasaman Saba, Charumathi Sabanayagam, Maria Sabater-Lleal, Cinzia Felicita Sala, Veikko Salomaa, Kevin Sandow, Helena Schmidt, Laura J Scott, William R Scott, Bahareh Sedaghati-Khayat, Bengt Sennblad, Jessica van Setten, Peter J Sever, Wayne H-H Sheu, Yuan Shi, Smeeta Shrestha, Sharvari Rahul Shukla, Jon K Sigurdsson, Timo Tonis Sikka, Jai Rup Singh, Blair H Smith, Alena Stančáková, Alice Stanton, John M Starr, Lilja Stefansdottir, Leon Straker, Patrick Sulem, Gardar Sveinbjornsson, Morris A Swertz, Adele M Taylor, Kent D Taylor, Natalie Terzikhan, Yih-Chung Tham, Gudmar Thorleifsson, Unnur Thorsteinsdottir, Annika Tillander, Russell P Tracy, Teresa Tusié-Luna, Ioanna Tzoulaki, Simona Vaccargiu, Jagadish Vangipurapu, Jan H Veldink, Veronique Vitart, Uwe Völker, Eero Vuoksimaa, Salma M Wakil, Melanie Waldenberger, Gurpreet S Wander, Ya Xing Wang, Nicholas J Wareham, Sarah Wild, Chittaranjan S Yajnik, Jian-Min Yuan, Lingyao Zeng, Liang Zhang, Jie Zhou, Najaf Amin, Folkert W Asselbergs, Stephan J L Bakker, Diane M Becker, Benjamin Lehne, David A Bennett, Leonard H van den Berg, Sonja I Berndt, Dwaipayan Bharadwaj, Lawrence F Bielak, Murielle Bochud, Mike Boehnke, Claude Bouchard, Jonathan P Bradfield, Jennifer A Brody, Archie Campbell, Shai Carmi, Mark J Caulfield, David Cesarini, John C Chambers, Giriraj Ratan Chandak, Ching-Yu Cheng, Marina Ciullo, Marilyn Cornelis, Daniele Cusi, George Davey Smith, Ian J Deary, Rajkumar Dorajoo, Cornelia M van Duijn, David Ellinghaus, Jeanette Erdmann, Johan G Eriksson, Evangelos Evangelou, Michele K Evans, Jessica D Faul, Bjarke Feenstra, Mary Feitosa, Sylvain Foisy, Andre Franke, Yechiel Friedlander, Paolo Gasparini, Christian Gieger, Clicerio Gonzalez, Philippe Goyette, Struan F A Grant, Lyn R Griffiths, Leif Groop, Vilmundur Gudnason, Ulf Gyllensten, Hakon Hakonarson, Anders Hamsten, Pim van der Harst, Chew-Kiat Heng, Andrew A Hicks, Hagit Hochner, Heikki Huikuri, Steven C Hunt, Vincent W V Jaddoe, Philip L De Jager, Magnus Johannesson, Åsa Johansson, Jost B Jonas, J Wouter Jukema, Juhani Junttila, Jaakko Kaprio, Sharon L. R. Kardia, Fredrik Karpe, Meena Kumari, Markku Laakso, Sander W van der Laan, Jari Lahti, Matthias Laudes, Rodney A Lea, Wolfgang Lieb, Thomas Lumley, Nicholas G Martin, Winfried März, Giuseppe Matullo, Mark I McCarthy, Sarah E Medland, Tony R Merriman, Andres Metspalu, Brian F Meyer, Karen L Mohlke, Grant W Montgomery, Dennis Mook-Kanamori, Patricia B Munroe, Kari E North, Dale R Nyholt, Jeffery R O’connell, Carole Ober, Albertine J Oldehinkel, Walter Palmas, Colin Palmer, Gerard G Pasterkamp, Etienne Patin, Craig E Pennell, Louis Perusse, Patricia A Peyser, Mario Pirastu, Tinca J. C. Polderman, David J Porteous, Danielle Posthuma, Bruce M Psaty, John D Rioux, Fernando Rivadeneira, Charles Rotimi, Jerome I Rotter, Igor Rudan, Hester M Den Ruijter, Dharambir K Sanghera, Naveed Sattar, Reinhold Schmidt, Matthias B Schulze, Heribert Schunkert, Robert A Scott, Alan R Shuldiner, Xueling Sim, Neil Small, Jennifer A Smith, Nona Sotoodehnia, E-Shyong Tai, Alexander Teumer, Nicholas J Timpson, Daniela Toniolo, David-Alexandre Tregouet, Tiinamaija Tuomi, Peter Vollenweider, Carol A Wang, David R Weir, John B Whitfield, Cisca Wijmenga, Tien-Yin Wong, John Wright, Jingyun Yang, Lei Yu, Babette S Zemel, Alan B Zonderman, Markus Perola, Patrik K. E. Magnusson, André G Uitterlinden, Jaspal S Kooner, Daniel I Chasman, Ruth J. F. Loos, Nora Franceschini, Lude Franke, Chris S Haley, Caroline Hayward, Robin G Walters, John R. B. Perry, Tōnu Esko, Agnar Helgason, Kari Stefansson, Peter K Joshi, Michiaki Kubo, and James F Wilson
Subjects: Science
Abstract: Inbreeding depression has been observed in many different species, but in humans a systematic analysis has been difficult so far. Here, analysing more than 1.3 million individuals, the authors show that a genomic inbreeding coefficient (FROH) is associated with disadvantageous outcomes in 32 out of 100 traits tested.
Published: 2019
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16. Genome-wide association meta-analyses and fine-mapping elucidate pathways influencing albuminuria

Author: Alexander Teumer, Yong Li, Sahar Ghasemi, Bram P. Prins, Matthias Wuttke, Tobias Hermle, Ayush Giri, Karsten B. Sieber, Chengxiang Qiu, Holger Kirsten, Adrienne Tin, Audrey Y. Chu, Nisha Bansal, Mary F. Feitosa, Lihua Wang, Jin-Fang Chai, Massimiliano Cocca, Christian Fuchsberger, Mathias Gorski, Anselm Hoppmann, Katrin Horn, Man Li, Jonathan Marten, Damia Noce, Teresa Nutile, Sanaz Sedaghat, Gardar Sveinbjornsson, Bamidele O. Tayo, Peter J. van der Most, Yizhe Xu, Zhi Yu, Lea Gerstner, Johan Ärnlöv, Stephan J. L. Bakker, Daniela Baptista, Mary L. Biggs, Eric Boerwinkle, Hermann Brenner, Ralph Burkhardt, Robert J. Carroll, Miao-Li Chee, Miao-Ling Chee, Mengmeng Chen, Ching-Yu Cheng, James P. Cook, Josef Coresh, Tanguy Corre, John Danesh, Martin H. de Borst, Alessandro De Grandi, Renée de Mutsert, Aiko P. J. de Vries, Frauke Degenhardt, Katalin Dittrich, Jasmin Divers, Kai-Uwe Eckardt, Georg Ehret, Karlhans Endlich, Janine F. Felix, Oscar H. Franco, Andre Franke, Barry I. Freedman, Sandra Freitag-Wolf, Ron T. Gansevoort, Vilmantas Giedraitis, Martin Gögele, Franziska Grundner-Culemann, Daniel F. Gudbjartsson, Vilmundur Gudnason, Pavel Hamet, Tamara B. Harris, Andrew A. Hicks, Hilma Holm, Valencia Hui Xian Foo, Shih-Jen Hwang, M. Arfan Ikram, Erik Ingelsson, Vincent W. V. Jaddoe, Johanna Jakobsdottir, Navya Shilpa Josyula, Bettina Jung, Mika Kähönen, Chiea-Chuen Khor, Wieland Kiess, Wolfgang Koenig, Antje Körner, Peter Kovacs, Holly Kramer, Bernhard K. Krämer, Florian Kronenberg, Leslie A. Lange, Carl D. Langefeld, Jeannette Jen-Mai Lee, Terho Lehtimäki, Wolfgang Lieb, Su-Chi Lim, Lars Lind, Cecilia M. Lindgren, Jianjun Liu, Markus Loeffler, Leo-Pekka Lyytikäinen, Anubha Mahajan, Joseph C. Maranville, Deborah Mascalzoni, Barbara McMullen, Christa Meisinger, Thomas Meitinger, Kozeta Miliku, Dennis O. Mook-Kanamori, Martina Müller-Nurasyid, Josyf C. Mychaleckyj, Matthias Nauck, Kjell Nikus, Boting Ning, Raymond Noordam, Jeffrey O’ Connell, Isleifur Olafsson, Nicholette D. Palmer, Annette Peters, Anna I. Podgornaia, Belen Ponte, Tanja Poulain, Peter P. Pramstaller, Ton J. Rabelink, Laura M. Raffield, Dermot F. Reilly, Rainer Rettig, Myriam Rheinberger, Kenneth M. Rice, Fernando Rivadeneira, Heiko Runz, Kathleen A. Ryan, Charumathi Sabanayagam, Kai-Uwe Saum, Ben Schöttker, Christian M. Shaffer, Yuan Shi, Albert V. Smith, Konstantin Strauch, Michael Stumvoll, Benjamin B. Sun, Silke Szymczak, E-Shyong Tai, Nicholas Y. Q. Tan, Kent D. Taylor, Andrej Teren, Yih-Chung Tham, Joachim Thiery, Chris H. L. Thio, Hauke Thomsen, Unnur Thorsteinsdottir, Anke Tönjes, Johanne Tremblay, André G. Uitterlinden, Pim van der Harst, Niek Verweij, Suzanne Vogelezang, Uwe Völker, Melanie Waldenberger, Chaolong Wang, Otis D. Wilson, Charlene Wong, Tien-Yin Wong, Qiong Yang, Masayuki Yasuda, Shreeram Akilesh, Murielle Bochud, Carsten A. Böger, Olivier Devuyst, Todd L. Edwards, Kevin Ho, Andrew P. Morris, Afshin Parsa, Sarah A. Pendergrass, Bruce M. Psaty, Jerome I. Rotter, Kari Stefansson, James G. Wilson, Katalin Susztak, Harold Snieder, Iris M. Heid, Markus Scholz, Adam S. Butterworth, Adriana M. Hung, Cristian Pattaro, and Anna Köttgen
Subjects: Science
Abstract: Urinary albumin-to-creatinine ratio (UCAR) is associated with various clinical outcomes such as kidney disease and cardiovascular disease. Here, the authors report genome-wide meta-analysis in over 500,000 individuals and find 68 UACR loci, followed by statistical fine-mapping, gene prioritization and experimental validation in flies.
Published: 2019
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17. Plasma apoM and S1P levels are inversely associated with mortality in African Americans with type 2 diabetes mellitus

Author: Mingxia Liu, Cecilia Frej, Carl D. Langefeld, Jasmin Divers, Donald W. Bowden, J. Jeffrey Carr, Abraham K. Gebre, Jianzhao Xu, Benny Larsson, Björn Dahlbäck, Barry I. Freedman, and John S. Parks
Subjects: apolipoproteins, high density lipoprotein, atherosclerosis, clinical studies, ethnicity, apolipoprotein M, Biochemistry, QD415-436
Abstract: apoM is a minor HDL apolipoprotein and carrier for sphingosine-1-phosphate (S1P). HDL apoM and S1P concentrations are inversely associated with atherosclerosis progression in rodents. We evaluated associations between plasma concentrations of S1P, plasma concentrations of apoM, and HDL apoM levels with prevalent subclinical atherosclerosis and mortality in the African American-Diabetes Heart Study participants (N = 545). Associations between plasma S1P, plasma apoM, and HDL apoM with subclinical atherosclerosis and mortality were assessed using multivariate parametric, nonparametric, and Cox proportional hazards models. At baseline, participants' median (25th percentile, 75th percentile) age was 55 (49, 62) years old and their coronary artery calcium (CAC) mass score was 26.5 (0.0, 346.5). Plasma S1P, plasma apoM, and HDL apoM were not associated with CAC. After 64 (57.6, 70.3) months of follow-up, 81 deaths were recorded. Higher concentrations of plasma S1P [odds ratio (OR) = 0.14, P = 0.01] and plasma apoM (OR = 0.10, P = 0.02), but not HDL apoM (P = 0.89), were associated with lower mortality after adjusting for age, sex, statin use, CAC, kidney function, and albuminuria. We conclude that plasma S1P and apoM concentrations are inversely and independently associated with mortality, but not CAC, in African Americans with type 2 diabetes after accounting for conventional risk factors.
Published: 2019
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18. Genome-wide association study identifies novel loci for type 2 diabetes-attributed end-stage kidney disease in African Americans

Author: Meijian Guan, Jacob M. Keaton, Latchezar Dimitrov, Pamela J. Hicks, Jianzhao Xu, Nicholette D. Palmer, Lijun Ma, Swapan K. Das, Yii-Der I. Chen, Josef Coresh, Myriam Fornage, Nora Franceschini, Holly Kramer, Carl D. Langefeld, Josyf C. Mychaleckyj, Rulan S. Parekh, Wendy S. Post, Laura J. Rasmussen-Torvik, Stephen S. Rich, Jerome I. Rotter, John R. Sedor, Denyse Thornley-Brown, Adrienne Tin, James G. Wilson, Barry I. Freedman, Donald W. Bowden, Maggie C. Y. Ng, and FIND Consortium
Subjects: African Americans, Genome-wide association study, Type 2 diabetes, Diabetic kidney disease, End-stage kidney disease, Medicine, Genetics, QH426-470
Abstract: Abstract Background End-stage kidney disease (ESKD) is a significant public health concern disproportionately affecting African Americans (AAs). Type 2 diabetes (T2D) is the leading cause of ESKD in the USA, and efforts to uncover genetic susceptibility to diabetic kidney disease (DKD) have had limited success. A prior genome-wide association study (GWAS) in AAs with T2D-ESKD was expanded with additional AA cases and controls and genotypes imputed to the higher density 1000 Genomes reference panel. The discovery analysis included 3432 T2D-ESKD cases and 6977 non-diabetic non-nephropathy controls (N = 10,409), followed by a discrimination analysis in 2756 T2D non-nephropathy controls to exclude T2D-associated variants. Results Six independent variants located in or near RND3/RBM43, SLITRK3, ENPP7, GNG7, and APOL1 achieved genome-wide significant association (P
Published: 2019
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19. Multi-ancestry study of blood lipid levels identifies four loci interacting with physical activity

Author: Tuomas O. Kilpeläinen, Amy R. Bentley, Raymond Noordam, Yun Ju Sung, Karen Schwander, Thomas W. Winkler, Hermina Jakupović, Daniel I. Chasman, Alisa Manning, Ioanna Ntalla, Hugues Aschard, Michael R. Brown, Lisa de las Fuentes, Nora Franceschini, Xiuqing Guo, Dina Vojinovic, Stella Aslibekyan, Mary F. Feitosa, Minjung Kho, Solomon K. Musani, Melissa Richard, Heming Wang, Zhe Wang, Traci M. Bartz, Lawrence F. Bielak, Archie Campbell, Rajkumar Dorajoo, Virginia Fisher, Fernando P. Hartwig, Andrea R. V. R. Horimoto, Changwei Li, Kurt K. Lohman, Jonathan Marten, Xueling Sim, Albert V. Smith, Salman M. Tajuddin, Maris Alver, Marzyeh Amini, Mathilde Boissel, Jin Fang Chai, Xu Chen, Jasmin Divers, Evangelos Evangelou, Chuan Gao, Mariaelisa Graff, Sarah E. Harris, Meian He, Fang-Chi Hsu, Anne U. Jackson, Jing Hua Zhao, Aldi T. Kraja, Brigitte Kühnel, Federica Laguzzi, Leo-Pekka Lyytikäinen, Ilja M. Nolte, Rainer Rauramaa, Muhammad Riaz, Antonietta Robino, Rico Rueedi, Heather M. Stringham, Fumihiko Takeuchi, Peter J. van der Most, Tibor V. Varga, Niek Verweij, Erin B. Ware, Wanqing Wen, Xiaoyin Li, Lisa R. Yanek, Najaf Amin, Donna K. Arnett, Eric Boerwinkle, Marco Brumat, Brian Cade, Mickaël Canouil, Yii-Der Ida Chen, Maria Pina Concas, John Connell, Renée de Mutsert, H. Janaka de Silva, Paul S. de Vries, Ayşe Demirkan, Jingzhong Ding, Charles B. Eaton, Jessica D. Faul, Yechiel Friedlander, Kelley P. Gabriel, Mohsen Ghanbari, Franco Giulianini, Chi Charles Gu, Dongfeng Gu, Tamara B. Harris, Jiang He, Sami Heikkinen, Chew-Kiat Heng, Steven C. Hunt, M. Arfan Ikram, Jost B. Jonas, Woon-Puay Koh, Pirjo Komulainen, Jose E. Krieger, Stephen B. Kritchevsky, Zoltán Kutalik, Johanna Kuusisto, Carl D. Langefeld, Claudia Langenberg, Lenore J. Launer, Karin Leander, Rozenn N. Lemaitre, Cora E. Lewis, Jingjing Liang, Lifelines Cohort Study, Jianjun Liu, Reedik Mägi, Ani Manichaikul, Thomas Meitinger, Andres Metspalu, Yuri Milaneschi, Karen L. Mohlke, Thomas H. Mosley, Alison D. Murray, Mike A. Nalls, Ei-Ei Khaing Nang, Christopher P. Nelson, Sotoodehnia Nona, Jill M. Norris, Chiamaka Vivian Nwuba, Jeff O’Connell, Nicholette D. Palmer, George J. Papanicolau, Raha Pazoki, Nancy L. Pedersen, Annette Peters, Patricia A. Peyser, Ozren Polasek, David J. Porteous, Alaitz Poveda, Olli T. Raitakari, Stephen S. Rich, Neil Risch, Jennifer G. Robinson, Lynda M. Rose, Igor Rudan, Pamela J. Schreiner, Robert A. Scott, Stephen S. Sidney, Mario Sims, Jennifer A. Smith, Harold Snieder, Tamar Sofer, John M. Starr, Barbara Sternfeld, Konstantin Strauch, Hua Tang, Kent D. Taylor, Michael Y. Tsai, Jaakko Tuomilehto, André G. Uitterlinden, M. Yldau van der Ende, Diana van Heemst, Trudy Voortman, Melanie Waldenberger, Patrik Wennberg, Gregory Wilson, Yong-Bing Xiang, Jie Yao, Caizheng Yu, Jian-Min Yuan, Wei Zhao, Alan B. Zonderman, Diane M. Becker, Michael Boehnke, Donald W. Bowden, Ulf de Faire, Ian J. Deary, Paul Elliott, Tõnu Esko, Barry I. Freedman, Philippe Froguel, Paolo Gasparini, Christian Gieger, Norihiro Kato, Markku Laakso, Timo A. Lakka, Terho Lehtimäki, Patrik K. E. Magnusson, Albertine J. Oldehinkel, Brenda W. J. H. Penninx, Nilesh J. Samani, Xiao-Ou Shu, Pim van der Harst, Jana V. Van Vliet-Ostaptchouk, Peter Vollenweider, Lynne E. Wagenknecht, Ya X. Wang, Nicholas J. Wareham, David R. Weir, Tangchun Wu, Wei Zheng, Xiaofeng Zhu, Michele K. Evans, Paul W. Franks, Vilmundur Gudnason, Caroline Hayward, Bernardo L. Horta, Tanika N. Kelly, Yongmei Liu, Kari E. North, Alexandre C. Pereira, Paul M. Ridker, E. Shyong Tai, Rob M. van Dam, Ervin R. Fox, Sharon L. R. Kardia, Ching-Ti Liu, Dennis O. Mook-Kanamori, Michael A. Province, Susan Redline, Cornelia M. van Duijn, Jerome I. Rotter, Charles B. Kooperberg, W. James Gauderman, Bruce M. Psaty, Kenneth Rice, Patricia B. Munroe, Myriam Fornage, L. Adrienne Cupples, Charles N. Rotimi, Alanna C. Morrison, Dabeeru C. Rao, and Ruth J. F. Loos
Subjects: Science
Abstract: GWAS have identified more than 500 genetic loci associated with blood lipid levels. Here, the authors report a genome-wide analysis of interactions between genetic markers and physical activity, and find that physical activity modifies the effects of four genetic loci on HDL or LDL cholesterol.
Published: 2019
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20. Genome-wide association study of vitamin D concentrations and bone mineral density in the African American-Diabetes Heart Study.

Author: Nicholette D Palmer, Lingyi Lu, Thomas C Register, Leon Lenchik, J Jeffrey Carr, Pamela J Hicks, S Carrie Smith, Jianzhao Xu, Latchezar Dimitrov, Jacob Keaton, Meijian Guan, Maggie C Y Ng, Yii-der I Chen, Anthony J Hanley, Corinne D Engelman, Jill M Norris, Carl D Langefeld, Lynne E Wagenknecht, Donald W Bowden, Barry I Freedman, and Jasmin Divers
Subjects: Medicine, Science
Abstract: Relative to European Americans, African Americans have lower 25-hydroxyvitamin D (25OHD) and vitamin D binding protein (VDBP) concentrations, higher 1,25-dihydroxyvitamin D (1,25(OH)2D3) concentrations and bone mineral density (BMD), and paradoxically reduced burdens of calcified atherosclerotic plaque (subclinical atherosclerosis). To identify genetic factors contributing to vitamin D and BMD measures, association analysis of >14M variants was conducted in a maximum of 697 African American-Diabetes Heart Study participants with type 2 diabetes (T2D). The most significant association signals were detected for VDBP on chromosome 4; variants rs7041 (β = 0.44, SE = 0.019, P = 9.4x10-86) and rs4588 (β = 0.17, SE = 0.021, P = 3.5x10-08) in the group-specific component (vitamin D binding protein) gene (GC). These variants were found to be independently associated. In addition, rs7041 was also associated with bioavailable vitamin D (BAVD; β = 0.16, SE = 0.02, P = 3.3x10-19). Six rare variants were significantly associated with 25OHD, including a non-synonymous variant in HSPG2 (rs116788687; β = -1.07, SE = 0.17, P = 2.2x10-10) and an intronic variant in TNIK (rs143555701; β = -1.01, SE = 0.18, P = 9.0x10-10), both biologically related to bone development. Variants associated with 25OHD failed to replicate in African Americans from the Insulin Resistance Atherosclerosis Family Study (IRASFS). Evaluation of vitamin D metabolism and bone mineral density phenotypes in an African American population enriched for T2D could provide insight into ethnic specific differences in vitamin D metabolism and bone mineral density.
Published: 2021
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21. Bioinformatics Analysis Reveals a Shared Pathway for Common Forms of Adult Nephrotic Syndrome

Author: DengFeng Li, Liang Liu, Mariana Murea, Barry I. Freedman, and Lijun Ma
Subjects: General Medicine
Published: 2023

22. An Exome-wide Association Study for Type 2 Diabetes–Attributed End-Stage Kidney Disease in African Americans

Author: Meijian Guan, Jacob M. Keaton, Latchezar Dimitrov, Pamela J. Hicks, Jianzhao Xu, Nicholette D. Palmer, James G. Wilson, Barry I. Freedman, Donald W. Bowden, and Maggie C.Y. Ng
Subjects: Diseases of the genitourinary system. Urology, RC870-923
Abstract: Introduction: Compared with European Americans, African Americans (AAs) are at higher risk for developing end-stage kidney disease (ESKD). Genome-wide association studies (GWAS) have identified >70 genetic variants associated with kidney function and chronic kidney disease (CKD) in patients with and without diabetes. However, these variants explain a small proportion of disease liability. This study examined the contribution of coding genetic variants for risk of type 2 diabetes (T2D)-attributed ESKD and advanced CKD in AAs. Methods: Exome sequencing was performed in 456 AA T2D-ESKD cases, and 936 AA nondiabetic, non-nephropathy control individuals at the discovery stage. A mixed logistic regression model was used for association analysis. Nominal associations (P < 0.05) were replicated in an additional 2020 T2D-ESKD cases and 1121 nondiabetic, non-nephropathy control individuals. A meta-analysis combining 4533 discovery and replication samples was performed. Putative T2D-ESKD associations were tested in additional 1910 nondiabetic ESKD and 219 T2D-ESKD cases, as well as 912 AA nondiabetic non-nephropathy control individuals. Results: A total of 11 suggestive T2D-ESKD associations (P < 1 x 10−4) from 8 loci (PLEKHN1, NADK, RAD51AP2, RREB1, PEX6, GRM8, PRX, APOL1) were apparent in the meta-analysis. Exclusion of APOL1 renal-risk genotype carriers identified 3 additional suggestive loci (OTUD7B, IFITM3, DLGAP5). Rs41302867 in RREB1 displayed consistent association with T2D-ESKD and nondiabetic ESKD (odds ratio: 0.47; P = 1.2 x 10−6 in 4605 all-cause ESKD and 2969 nondiabetic non-nephropathy control individuals). Conclusion: Our findings suggest that coding genetic variants are implicated in predisposition to T2D-ESKD in AAs. Keywords: African Americans, chronic kidney disease, end-stage kidney disease, exome sequencing, genetics, type 2 diabetes
Published: 2018
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23. Associations of coronary artery calcified plaque density with mortality in type 2 diabetes: the Diabetes Heart Study

Author: Laura M. Raffield, Amanda J. Cox, Michael H. Criqui, Fang-Chi Hsu, James G. Terry, Jianzhao Xu, Barry I. Freedman, J. Jeffrey Carr, and Donald W. Bowden
Subjects: Coronary artery calcification, Plaque density, Type 2 diabetes, Mortality, Diseases of the circulatory (Cardiovascular) system, RC666-701
Abstract: Abstract Background Coronary artery calcified plaque (CAC) is strongly predictive of cardiovascular disease (CVD) events and mortality, both in general populations and individuals with type 2 diabetes at high risk for CVD. CAC is typically reported as an Agatston score, which is weighted for increased plaque density. However, the role of CAC density in CVD risk prediction, independently and with CAC volume, remains unclear. Methods We examined the role of CAC density in individuals with type 2 diabetes from the family-based Diabetes Heart Study and the African American-Diabetes Heart Study. CAC density was calculated as mass divided by volume, and associations with incident all-cause and CVD mortality [median follow-up 10.2 years European Americans (n = 902, n = 286 deceased), 5.2 years African Americans (n = 552, n = 93 deceased)] were examined using Cox proportional hazards models, independently and in models adjusted for CAC volume. Results In European Americans, CAC density, like Agatston score and volume, was consistently associated with increased risk of all-cause and CVD mortality (p ≤ 0.002) in models adjusted for age, sex, statin use, total cholesterol, HDL, systolic blood pressure, high blood pressure medication use, and current smoking. However, these associations were no longer significant when models were additionally adjusted for CAC volume. CAC density was not significantly associated with mortality, either alone or adjusted for CAC volume, in African Americans. Conclusions CAC density is not associated with mortality independent from CAC volume in European Americans and African Americans with type 2 diabetes.
Published: 2018
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24. Genome-wide association study of coronary artery calcified atherosclerotic plaque in African Americans with type 2 diabetes

Author: Jasmin Divers, Nicholette D. Palmer, Carl D. Langefeld, W. Mark Brown, Lingyi Lu, Pamela J. Hicks, S. Carrie Smith, Jianzhao Xu, James G. Terry, Thomas C. Register, Lynne E. Wagenknecht, John S. Parks, Lijun Ma, Gary C. Chan, Sarah G. Buxbaum, Adolfo Correa, Solomon Musani, James G. Wilson, Herman A. Taylor, Donald W. Bowden, John Jeffrey Carr, and Barry I. Freedman
Subjects: African Americans, Coronary artery calcified atherosclerotic plaque, Genome-wide association study, Cardiovascular disease, Type 2 diabetes, Genetics, QH426-470
Abstract: Abstract Background Coronary artery calcified atherosclerotic plaque (CAC) predicts cardiovascular disease (CVD). Despite exposure to more severe conventional CVD risk factors, African Americans (AAs) are less likely to develop CAC, and when they do, have markedly lower levels than European Americans. Genetic factors likely contribute to the observed ethnic differences. To identify genes associated with CAC in AAs with type 2 diabetes (T2D), a genome-wide association study (GWAS) was performed using the Illumina 5 M chip in 691 African American-Diabetes Heart Study participants (AA-DHS), with replication in 205 Jackson Heart Study (JHS) participants with T2D. Genetic association tests were performed on the genotyped and 1000 Genomes-imputed markers separately for each study, and combined in a meta-analysis. Results Single nucleotide polymorphisms (SNPs), rs11353135 (2q22.1), rs16879003 (6p22.3), rs5014012, rs58071836 and rs10244825 (all on chromosome 7), rs10918777 (9q31.2), rs13331874 (16p13.3) and rs4459623 (18q12.1) were associated with presence and/or quantity of CAC in the AA-DHS and JHS, with meta-analysis p-values ≤8.0 × 10−7. The strongest result in AA-DHS alone was rs6491315 in the 13q32.1 region (parameter estimate (SE) = −1.14 (0.20); p-value = 9.1 × 10−9). This GWAS peak replicated a previously reported AA-DHS CAC admixture signal (rs7492028, LOD score 2.8). Conclusions Genetic association between SNPs on chromosomes 2, 6, 7, 9, 16 and 18 and CAC were detected in AAs with T2D from AA-DHS and replicated in the JHS. These data support a role for genetic variation on these chromosomes as contributors to CAC in AAs with T2D, as well as to variation in CAC between populations of African and European ancestry.
Published: 2017
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25. Collaboration between Dialysis Providers

Author: Jeffrey Silberzweig, J. Ganesh Bhat, Mary O. Dittrich, Raghu Durvasula, Jeff Giullian, Jeffrey L. Hymes, Doug Johnson, Brigitte Schiller, Richard Spech, Leslie Spry, Geoffrey Scott Walker, Suzanne Watnick, Jerry Yee, and Barry I. Freedman
Subjects: Nephrology, Renal Dialysis, Humans, Kidney Failure, Chronic, General Medicine
Published: 2023

26. Transancestral mapping and genetic load in systemic lupus erythematosus

Author: Carl D. Langefeld, Hannah C. Ainsworth, Deborah S. Cunninghame Graham, Jennifer A. Kelly, Mary E. Comeau, Miranda C. Marion, Timothy D. Howard, Paula S. Ramos, Jennifer A. Croker, David L. Morris, Johanna K. Sandling, Jonas Carlsson Almlöf, Eduardo M. Acevedo-Vásquez, Graciela S. Alarcón, Alejandra M. Babini, Vicente Baca, Anders A. Bengtsson, Guillermo A. Berbotto, Marc Bijl, Elizabeth E. Brown, Hermine I. Brunner, Mario H. Cardiel, Luis Catoggio, Ricard Cervera, Jorge M. Cucho-Venegas, Solbritt Rantapää Dahlqvist, Sandra D’Alfonso, Berta Martins Da Silva, Iñigo de la Rúa Figueroa, Andrea Doria, Jeffrey C. Edberg, Emőke Endreffy, Jorge A. Esquivel-Valerio, Paul R. Fortin, Barry I. Freedman, Johan Frostegård, Mercedes A. García, Ignacio García de la Torre, Gary S. Gilkeson, Dafna D. Gladman, Iva Gunnarsson, Joel M. Guthridge, Jennifer L. Huggins, Judith A. James, Cees G. M. Kallenberg, Diane L. Kamen, David R. Karp, Kenneth M. Kaufman, Leah C. Kottyan, László Kovács, Helle Laustrup, Bernard R. Lauwerys, Quan-Zhen Li, Marco A. Maradiaga-Ceceña, Javier Martín, Joseph M. McCune, David R. McWilliams, Joan T. Merrill, Pedro Miranda, José F. Moctezuma, Swapan K. Nath, Timothy B. Niewold, Lorena Orozco, Norberto Ortego-Centeno, Michelle Petri, Christian A. Pineau, Bernardo A. Pons-Estel, Janet Pope, Prithvi Raj, Rosalind Ramsey-Goldman, John D. Reveille, Laurie P. Russell, José M. Sabio, Carlos A. Aguilar-Salinas, Hugo R. Scherbarth, Raffaella Scorza, Michael F. Seldin, Christopher Sjöwall, Elisabet Svenungsson, Susan D. Thompson, Sergio M. A. Toloza, Lennart Truedsson, Teresa Tusié-Luna, Carlos Vasconcelos, Luis M. Vilá, Daniel J. Wallace, Michael H. Weisman, Joan E. Wither, Tushar Bhangale, Jorge R. Oksenberg, John D. Rioux, Peter K. Gregersen, Ann-Christine Syvänen, Lars Rönnblom, Lindsey A. Criswell, Chaim O. Jacob, Kathy L. Sivils, Betty P. Tsao, Laura E. Schanberg, Timothy W. Behrens, Earl D. Silverman, Marta E. Alarcón-Riquelme, Robert P. Kimberly, John B. Harley, Edward K. Wakeland, Robert R. Graham, Patrick M. Gaffney, and Timothy J. Vyse
Subjects: Science
Abstract: Systemic lupus erythematosus (SLE) is an autoimmune disease with a strong ethnic and gender bias. In a transancestral genetic association study, Langefeldet al. identify 24 novel regions associated with risk to lupus and propose a cumulative hits hypothesis for loci conferring risk to SLE.
Published: 2017
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27. APOL1 Renal-Risk Variants Do Not Associate With Incident Cardiovascular Disease or Mortality in the Systolic Blood Pressure Intervention Trial

Author: Barry I. Freedman, Michael V. Rocco, Jeffrey T. Bates, Michel Chonchol, Amret T. Hawfield, James P. Lash, Vasilios Papademetriou, John R. Sedor, Karen Servilla, Paul L. Kimmel, Barry M. Wall, and Nicholas M. Pajewski
Subjects: African Americans, albuminuria, APOL1, cardiovascular disease, chronic kidney disease, SPRINT, Diseases of the genitourinary system. Urology, RC870-923
Abstract: Relationships between apolipoprotein L1 gene (APOL1) renal-risk variants (RRVs) and cardiovascular disease (CVD) remain controversial. To clarify associations between APOL1 and CVD, a total of 2568 African American Systolic Blood Pressure Intervention Trial (SPRINT) participants were assessed for the incidence of CVD events (primary composite including nonfatal myocardial infarction, acute coronary syndrome not resulting in myocardial infarction, nonfatal stroke, nonfatal acute decompensated heart failure, and CVD death), renal outcomes, and all-cause mortality. Methods: Cox proportional hazards regression models were used, adjusting for age, sex, African ancestry proportion, and treatment group (systolic blood pressure target of
Published: 2017
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28. Hepatocyte ABCA1 Deletion Impairs Liver Insulin Signaling and Lipogenesis

Author: Chia-Chi C. Key, Mingxia Liu, C. Lisa Kurtz, Soonkyu Chung, Elena Boudyguina, Timothy A. Dinh, Alexander Bashore, Peter E. Phelan, Barry I. Freedman, Timothy F. Osborne, Xuewei Zhu, Lijun Ma, Praveen Sethupathy, Sudha B. Biddinger, and John S. Parks
Subjects: hepatosteatosis, cholesterol, lipid raft, vesicle trafficking, selective insulin resistance, mTORC, plasma membrane, hepatocyte, Western-type diet, Biology (General), QH301-705.5
Abstract: Plasma membrane (PM) free cholesterol (FC) is emerging as an important modulator of signal transduction. Here, we show that hepatocyte-specific knockout (HSKO) of the cellular FC exporter, ATP-binding cassette transporter A1 (ABCA1), leads to decreased PM FC content and defective trafficking of lysosomal FC to the PM. Compared with controls, chow-fed HSKO mice had reduced hepatic (1) insulin-stimulated Akt phosphorylation, (2) activation of the lipogenic transcription factor Sterol Regulatory Element Binding Protein (SREBP)-1c, and (3) lipogenic gene expression. Consequently, Western-type diet-fed HSKO mice were protected from steatosis. Surprisingly, HSKO mice had intact glucose metabolism; they showed normal gluconeogenic gene suppression in response to re-feeding and normal glucose and insulin tolerance. We conclude that: (1) ABCA1 maintains optimal hepatocyte PM FC, through intracellular FC trafficking, for efficient insulin signaling; and (2) hepatocyte ABCA1 deletion produces a form of selective insulin resistance so that lipogenesis is suppressed but glucose metabolism remains normal.
Published: 2017
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29. A randomized pilot study comparing graft-first to fistula-first strategies in older patients with incident end-stage kidney disease: Clinical rationale and study design

Author: Mariana Murea, Randolph L. Geary, Matthew S. Edwards, Shahriar Moossavi, Ross P. Davis, Matthew P. Goldman, Justin Hurie, Timothy K. Williams, Gabriela Velazquez-Ramirez, Todd W. Robinson, Benjamin Bagwell, Audrey B. Tuttle, Kathryn E. Callahan, Michael V. Rocco, Denise K. Houston, Nicholas M. Pajewski, Jasmin Divers, Barry I. Freedman, and Jeff D. Williamson
Subjects: Medicine (General), R5-920
Abstract: Timely placement of an arteriovenous (AV) vascular access (native AV fistula [AVF] or prosthetic AV graft [AVG]) is necessary to limit the use of tunneled central venous catheters (TCVC) in patients with end-stage kidney disease (ESKD) treated with hemodialysis (HD). National guidelines recommend placement of AVF as the AV access of first choice in all patients to improve patient survival. The benefits of AVF over AVG are less certain in the older adults, as age-related biological changes independently modulate patient outcomes. This manuscript describes the rationale, study design and protocol for a randomized controlled pilot study of the feasibility and effects of AVG-first access placement in older adults with no prior AV access surgery. Fifty patients age ≥65 years, with incident ESKD on HD via TCVC or advanced kidney disease facing imminent HD initiation, and suitable upper extremity vasculature for initial placement of an AVF or AVG, will be randomly assigned to receive either an upper extremity AVG-first (intervention) or AVF-first (comparator) access. The study will establish feasibility of randomizing older adults to the two types of AV access surgery, evaluate relationships between measurements of preoperative physical function and vascular access development, compare vascular access outcomes between groups, and gather longitudinal assessments of upper extremity muscle strength, gait speed, performance of activities of daily living, and patient satisfaction with their vascular access and quality of life. Results will assist with the planning of a larger, multicenter trial assessing patient-centered outcomes. Keywords: arteriovenous access, Fistula, Graft, Hemodialysis, Older patients, Word count, abstract, 240, Text: 4,526, Figures: 1, Tables: 4
Published: 2019
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30. Prevalence and determinants of electrocardiographic abnormalities in African Americans with type 2 diabetes

Author: Matthew B. Sellers, Jasmin Divers, Lingyi Lu, Jianzhao Xu, S. Carrie Smith, Donald W. Bowden, David Herrington, Barry I. Freedman, and Elsayed Z. Soliman
Subjects: Electrocardiogram, Diabetes, African Americans, Heart, Hypertension, Cardiovascular disease, Public aspects of medicine, RA1-1270
Abstract: Background: Electrocardiographic (ECG) abnormalities are independently associated with poor outcomes in the general population. Their prevalence and determinants were assessed in the understudied African American population with type 2 diabetes. Methods: Standard 12-lead ECGs were digitally recorded in 635 unrelated African American-Diabetes Heart Study (AA-DHS) participants, automatically processed at a central lab, read, and coded using standard Minnesota ECG Classification. Age- and sex-specific prevalence rates of ECG abnormalities were calculated and logistic regression models were fitted to examine cross-sectional associations between participant characteristics and ECG abnormalities. Results: Participants were 56% women with a mean age of 56 years; 60% had at least one minor or major ECG abnormality [23% ⩾1 major (or major plus minor), and 37% ⩾1 minor (with no major)]. Men had a higher prevalence of ⩾1 minor or major ECG abnormality (66.1% men vs. 55.6% women, p = 0.0089). In univariate analysis, age, past history of cardiovascular disease, diabetes duration, systolic blood pressure, sex and statin use were associated with the presence of any (major or minor) ECG abnormalities. In a multivariate model including variables, female sex (OR [95% CI] 0.79 [0.67, 0.93]), statin use (0.79 [0.67, 0.93]) and diabetes duration (1.03 [1.0, 1.05]) remained statistically significant. Conclusions: Nearly three out of five African Americans with diabetes had at least one ECG abnormality. Female sex and statin use were significantly associated with lower odds of any ECG abnormality and diabetes duration was significantly associated with higher odds of any ECG abnormality in the multivariable model.
Published: 2019
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31. Characterization of circulating APOL1 protein complexes in African Americans

Author: Allison Weckerle, James A. Snipes, Dongmei Cheng, Abraham K. Gebre, Julie A. Reisz, Mariana Murea, Gregory S. Shelness, Gregory A. Hawkins, Cristina M. Furdui, Barry I. Freedman, John S. Parks, and Lijun Ma
Subjects: apolipoprotein L1, apolipoproteins, high density lipoprotein, kidney, proteomics, renal disease, Biochemistry, QD415-436
Abstract: APOL1 gene renal-risk variants are associated with nephropathy and CVD in African Americans; however, little is known about the circulating APOL1 variant proteins which reportedly bind to HDL. We examined whether APOL1 G1 and G2 renal-risk variant serum concentrations or lipoprotein distributions differed from nonrisk G0 APOL1 in African Americans without nephropathy. Serum APOL1 protein concentrations were similar regardless of APOL1 genotype. In addition, serum APOL1 protein was bound to protein complexes in two nonoverlapping peaks, herein referred to as APOL1 complex A (12.2 nm diameter) and complex B (20.0 nm diameter). Neither of these protein complexes associated with HDL or LDL. Proteomic analysis revealed that complex A was composed of APOA1, haptoglobin-related protein (HPR), and complement C3, whereas complex B contained APOA1, HPR, IgM, and fibronectin. Serum HPR was less abundant on complex B in individuals with G1 and G2 renal-risk variant genotypes, relative to G0 (P = 0.0002–0.037). These circulating complexes may play roles in HDL metabolism and susceptibility to CVD.
Published: 2016
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32. Genetic associations at 53 loci highlight cell types and biological pathways relevant for kidney function

Author: Cristian Pattaro, Alexander Teumer, Mathias Gorski, Audrey Y. Chu, Man Li, Vladan Mijatovic, Maija Garnaas, Adrienne Tin, Rossella Sorice, Yong Li, Daniel Taliun, Matthias Olden, Meredith Foster, Qiong Yang, Ming-Huei Chen, Tune H. Pers, Andrew D. Johnson, Yi-An Ko, Christian Fuchsberger, Bamidele Tayo, Michael Nalls, Mary F. Feitosa, Aaron Isaacs, Abbas Dehghan, Pio d’Adamo, Adebowale Adeyemo, Aida Karina Dieffenbach, Alan B. Zonderman, Ilja M. Nolte, Peter J. van der Most, Alan F. Wright, Alan R. Shuldiner, Alanna C. Morrison, Albert Hofman, Albert V. Smith, Albert W. Dreisbach, Andre Franke, Andre G. Uitterlinden, Andres Metspalu, Anke Tonjes, Antonio Lupo, Antonietta Robino, Åsa Johansson, Ayse Demirkan, Barbara Kollerits, Barry I. Freedman, Belen Ponte, Ben A. Oostra, Bernhard Paulweber, Bernhard K. Krämer, Braxton D. Mitchell, Brendan M. Buckley, Carmen A. Peralta, Caroline Hayward, Catherine Helmer, Charles N. Rotimi, Christian M. Shaffer, Christian Müller, Cinzia Sala, Cornelia M. van Duijn, Aude Saint-Pierre, Daniel Ackermann, Daniel Shriner, Daniela Ruggiero, Daniela Toniolo, Yingchang Lu, Daniele Cusi, Darina Czamara, David Ellinghaus, David S. Siscovick, Douglas Ruderfer, Christian Gieger, Harald Grallert, Elena Rochtchina, Elizabeth J. Atkinson, Elizabeth G. Holliday, Eric Boerwinkle, Erika Salvi, Erwin P. Bottinger, Federico Murgia, Fernando Rivadeneira, Florian Ernst, Florian Kronenberg, Frank B. Hu, Gerjan J. Navis, Gary C. Curhan, George B. Ehret, Georg Homuth, Stefan Coassin, Gian-Andri Thun, Giorgio Pistis, Giovanni Gambaro, Giovanni Malerba, Grant W. Montgomery, Gudny Eiriksdottir, Gunnar Jacobs, Guo Li, H-Erich Wichmann, Harry Campbell, Helena Schmidt, Henri Wallaschofski, Henry Völzke, Hermann Brenner, Heyo K. Kroemer, Holly Kramer, Honghuang Lin, I. Mateo Leach, Ian Ford, Idris Guessous, Igor Rudan, Inga Prokopenko, Ingrid Borecki, Iris M. Heid, Ivana Kolcic, Ivana Persico, J. Wouter Jukema, James F. Wilson, Janine F. Felix, Jasmin Divers, Jean-Charles Lambert, Jeanette M. Stafford, Jean-Michel Gaspoz, Jennifer A. Smith, Jessica D. Faul, Jie Jin Wang, Jingzhong Ding, Joel N. Hirschhorn, John Attia, John B. Whitfield, John Chalmers, Jorma Viikari, Josef Coresh, Joshua C. Denny, Juha Karjalainen, Jyotika K. Fernandes, Karlhans Endlich, Katja Butterbach, Keith L. Keene, Kurt Lohman, Laura Portas, Lenore J. Launer, Leo-Pekka Lyytikäinen, Loic Yengo, Lude Franke, Luigi Ferrucci, Lynda M. Rose, Lyudmyla Kedenko, Madhumathi Rao, Maksim Struchalin, Marcus E. Kleber, Margherita Cavalieri, Margot Haun, Marilyn C. Cornelis, Marina Ciullo, Mario Pirastu, Mariza de Andrade, Mark A. McEvoy, Mark Woodward, Martin Adam, Massimiliano Cocca, Matthias Nauck, Medea Imboden, Melanie Waldenberger, Menno Pruijm, Marie Metzger, Michael Stumvoll, Michele K. Evans, Michele M. Sale, Mika Kähönen, Mladen Boban, Murielle Bochud, Myriam Rheinberger, Niek Verweij, Nabila Bouatia-Naji, Nicholas G. Martin, Nick Hastie, Nicole Probst-Hensch, Nicole Soranzo, Olivier Devuyst, Olli Raitakari, Omri Gottesman, Oscar H. Franco, Ozren Polasek, Paolo Gasparini, Patricia B. Munroe, Paul M. Ridker, Paul Mitchell, Paul Muntner, Christa Meisinger, Johannes H. Smit, ICBP Consortium, AGEN Consortium, CARDIOGRAM, CHARGe-Heart Failure Group, ECHOGen Consortium, Peter Kovacs, Philipp S. Wild, Philippe Froguel, Rainer Rettig, Reedik Mägi, Reiner Biffar, Reinhold Schmidt, Rita P. S. Middelberg, Robert J. Carroll, Brenda W. Penninx, Rodney J. Scott, Ronit Katz, Sanaz Sedaghat, Sarah H. Wild, Sharon L. R. Kardia, Sheila Ulivi, Shih-Jen Hwang, Stefan Enroth, Stefan Kloiber, Stella Trompet, Benedicte Stengel, Stephen J. Hancock, Stephen T. Turner, Sylvia E. Rosas, Sylvia Stracke, Tamara B. Harris, Tanja Zeller, Tatijana Zemunik, Terho Lehtimäki, Thomas Illig, Thor Aspelund, Tiit Nikopensius, Tonu Esko, Toshiko Tanaka, Ulf Gyllensten, Uwe Völker, Valur Emilsson, Veronique Vitart, Ville Aalto, Vilmundur Gudnason, Vincent Chouraki, Wei-Min Chen, Wilmar Igl, Winfried März, Wolfgang Koenig, Wolfgang Lieb, Ruth J. F. Loos, Yongmei Liu, Harold Snieder, Peter P. Pramstaller, Afshin Parsa, Jeffrey R. O’Connell, Katalin Susztak, Pavel Hamet, Johanne Tremblay, Ian H. de Boer, Carsten A. Böger, Wolfram Goessling, Daniel I. Chasman, Anna Köttgen, W. H. Linda Kao, and Caroline S. Fox
Subjects: Science
Abstract: Reduced glomerular filtration rate (eGFR) is a hallmark of chronic kidney disease. Here, Pattaro et al. conduct a meta-analysis to discover several new loci associated with variation in eGFR and find that genes associated with eGFR loci often encode proteins potentially related to kidney development.
Published: 2016
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33. Gene Set Enrichment Analsyes Identify Pathways Involved in Genetic Risk for Diabetic Retinopathy

Author: Jie Jin Wang, Robert P. Igo, Barry I. Freedman, Jerome I. Rotter, Kathyrn P. Burdon, Alan D. Penman, Albert V. Smith, Xiaohui Li, Jamie E. Craig, Paul Mitchell, Brian L. Yaspan, Mary Frances Cotch, John M. Rouhana, Ayellet V. Segrè, Barbara E.K. Klein, Ashley Li, Richard A. Jensen, Gayatri Susarla, Lynn K. Stanwyck, Sudha K. Iyengar, Maggie C.Y. Ng, Ching J. Chen, Kent D. Taylor, Donald W. Bowden, Lucia Sobrin, Tien Yin Wong, Emily Y. Chew, Sharon G. Adler, Samuela Pollack, and Jane Z. Kuo
Subjects: Lipid catabolic process, Clinical Sciences, Genome-wide association study, Type 2 diabetes, Biology, Ophthalmology & Optometry, Polymorphism, Single Nucleotide, Article, Opthalmology and Optometry, Risk Factors, Diabetes Mellitus, Genetics, medicine, 2.1 Biological and endogenous factors, Humans, Interferon gamma, Polymorphism, Aetiology, Eye Disease and Disorders of Vision, Gene, Metabolic and endocrine, Lipid Transport, Diabetic Retinopathy, Catabolism, Diabetes, Human Genome, Single Nucleotide, medicine.disease, Ophthalmology, Diabetes Mellitus, Type 2, Public Health and Health Services, Lipid digestion, Type 2, Biotechnology, Genome-Wide Association Study, medicine.drug
Abstract: To identify functionally related genes associated with diabetic retinopathy (DR) risk using gene set enrichment analyses applied to genome-wide association study meta-analyses.MethodsWe analyzed DR GWAS meta-analyses performed on 3246 Europeans and 2611 African Americans with type 2 diabetes. Gene sets relevant to 5 key DR pathophysiology processes were investigated: tissue injury, vascular events, metabolic events and glial dysregulation, neuronal dysfunction, and inflammation. Keywords relevant to these processes were queried in 4 pathway and ontology databases. Two GSEA methods, Meta-Analysis Gene set Enrichment of variaNT Associations (MAGENTA) and Multi-marker Analysis of GenoMic Annotation (MAGMA), were used. Gene sets were defined to be enriched for gene associations with DR if the P value corrected for multiple testing (Pcorr) was
Published: 2022

34. Predicting Mortality in African Americans With Type 2 Diabetes Mellitus: Soluble Urokinase Plasminogen Activator Receptor, Coronary Artery Calcium, and High‐Sensitivity C‐Reactive Protein

Author: Salim S. Hayek, Jasmin Divers, Mohamad Raad, Jianzhao Xu, Donald W. Bowden, Melissa Tracy, Jochen Reiser, and Barry I. Freedman
Subjects: biomarker, calcium score, soluble urokinase plasminogen activator receptor, urokinase, Diseases of the circulatory (Cardiovascular) system, RC666-701
Abstract: BackgroundType 2 diabetes mellitus is a major risk factor for cardiovascular disease; however, outcomes in individual patients vary. Soluble urokinase plasminogen activator receptor (suPAR) is a bone marrow–derived signaling molecule associated with adverse cardiovascular and renal outcomes in many populations. We characterized the determinants of suPAR in African Americans with type 2 diabetes mellitus and assessed whether levels were useful for predicting mortality beyond clinical characteristics, coronary artery calcium (CAC), and high‐sensitivity C‐reactive protein (hs‐CRP). Methods and ResultsWe measured plasma suPAR levels in 500 African Americans with type 2 diabetes mellitus enrolled in the African American‐Diabetes Heart Study. We used Kaplan‐Meier curves and Cox proportional hazards models adjusting for clinical characteristics, CAC, and hs‐CRP to examine the association between suPAR and all‐cause mortality. Last, we report the change in C‐statistics comparing the additive values of suPAR, hs‐CRP, and CAC to clinical models for prediction of mortality. The suPAR levels were independently associated with female sex, smoking, insulin use, decreased kidney function, albuminuria, and CAC. After a median 6.8‐year follow‐up, a total of 68 deaths (13.6%) were recorded. In a model incorporating suPAR, CAC, and hs‐CRP, only suPAR was significantly associated with mortality (hazard ratio 2.66, 95% confidence interval 1.63‐4.34). Addition of suPAR to a baseline clinical model significantly improved the C‐statistic for all‐cause death (Δ0.05, 95% confidence interval 0.01‐0.10), whereas addition of CAC or hs‐CRP did not. ConclusionsIn African Americans with type 2 diabetes mellitus, suPAR was strongly associated with mortality and improved risk discrimination metrics beyond traditional risk factors, CAC and hs‐CRP. Studies addressing the clinical usefulness of measuring suPAR concentrations are warranted.
Published: 2018
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35. Novel genetic associations for blood pressure identified via gene-alcohol interaction in up to 570K individuals across multiple ancestries.

Author: Mary F Feitosa, Aldi T Kraja, Daniel I Chasman, Yun J Sung, Thomas W Winkler, Ioanna Ntalla, Xiuqing Guo, Nora Franceschini, Ching-Yu Cheng, Xueling Sim, Dina Vojinovic, Jonathan Marten, Solomon K Musani, Changwei Li, Amy R Bentley, Michael R Brown, Karen Schwander, Melissa A Richard, Raymond Noordam, Hugues Aschard, Traci M Bartz, Lawrence F Bielak, Rajkumar Dorajoo, Virginia Fisher, Fernando P Hartwig, Andrea R V R Horimoto, Kurt K Lohman, Alisa K Manning, Tuomo Rankinen, Albert V Smith, Salman M Tajuddin, Mary K Wojczynski, Maris Alver, Mathilde Boissel, Qiuyin Cai, Archie Campbell, Jin Fang Chai, Xu Chen, Jasmin Divers, Chuan Gao, Anuj Goel, Yanick Hagemeijer, Sarah E Harris, Meian He, Fang-Chi Hsu, Anne U Jackson, Mika Kähönen, Anuradhani Kasturiratne, Pirjo Komulainen, Brigitte Kühnel, Federica Laguzzi, Jian'an Luan, Nana Matoba, Ilja M Nolte, Sandosh Padmanabhan, Muhammad Riaz, Rico Rueedi, Antonietta Robino, M Abdullah Said, Robert A Scott, Tamar Sofer, Alena Stančáková, Fumihiko Takeuchi, Bamidele O Tayo, Peter J van der Most, Tibor V Varga, Veronique Vitart, Yajuan Wang, Erin B Ware, Helen R Warren, Stefan Weiss, Wanqing Wen, Lisa R Yanek, Weihua Zhang, Jing Hua Zhao, Saima Afaq, Najaf Amin, Marzyeh Amini, Dan E Arking, Tin Aung, Eric Boerwinkle, Ingrid Borecki, Ulrich Broeckel, Morris Brown, Marco Brumat, Gregory L Burke, Mickaël Canouil, Aravinda Chakravarti, Sabanayagam Charumathi, Yii-Der Ida Chen, John M Connell, Adolfo Correa, Lisa de Las Fuentes, Renée de Mutsert, H Janaka de Silva, Xuan Deng, Jingzhong Ding, Qing Duan, Charles B Eaton, Georg Ehret, Ruben N Eppinga, Evangelos Evangelou, Jessica D Faul, Stephan B Felix, Nita G Forouhi, Terrence Forrester, Oscar H Franco, Yechiel Friedlander, Ilaria Gandin, He Gao, Mohsen Ghanbari, Bruna Gigante, C Charles Gu, Dongfeng Gu, Saskia P Hagenaars, Göran Hallmans, Tamara B Harris, Jiang He, Sami Heikkinen, Chew-Kiat Heng, Makoto Hirata, Barbara V Howard, M Arfan Ikram, InterAct Consortium, Ulrich John, Tomohiro Katsuya, Chiea Chuen Khor, Tuomas O Kilpeläinen, Woon-Puay Koh, José E Krieger, Stephen B Kritchevsky, Michiaki Kubo, Johanna Kuusisto, Timo A Lakka, Carl D Langefeld, Claudia Langenberg, Lenore J Launer, Benjamin Lehne, Cora E Lewis, Yize Li, Shiow Lin, Jianjun Liu, Jingmin Liu, Marie Loh, Tin Louie, Reedik Mägi, Colin A McKenzie, Thomas Meitinger, Andres Metspalu, Yuri Milaneschi, Lili Milani, Karen L Mohlke, Yukihide Momozawa, Mike A Nalls, Christopher P Nelson, Nona Sotoodehnia, Jill M Norris, Jeff R O'Connell, Nicholette D Palmer, Thomas Perls, Nancy L Pedersen, Annette Peters, Patricia A Peyser, Neil Poulter, Leslie J Raffel, Olli T Raitakari, Kathryn Roll, Lynda M Rose, Frits R Rosendaal, Jerome I Rotter, Carsten O Schmidt, Pamela J Schreiner, Nicole Schupf, William R Scott, Peter S Sever, Yuan Shi, Stephen Sidney, Mario Sims, Colleen M Sitlani, Jennifer A Smith, Harold Snieder, John M Starr, Konstantin Strauch, Heather M Stringham, Nicholas Y Q Tan, Hua Tang, Kent D Taylor, Yik Ying Teo, Yih Chung Tham, Stephen T Turner, André G Uitterlinden, Peter Vollenweider, Melanie Waldenberger, Lihua Wang, Ya Xing Wang, Wen Bin Wei, Christine Williams, Jie Yao, Caizheng Yu, Jian-Min Yuan, Wei Zhao, Alan B Zonderman, Diane M Becker, Michael Boehnke, Donald W Bowden, John C Chambers, Ian J Deary, Tõnu Esko, Martin Farrall, Paul W Franks, Barry I Freedman, Philippe Froguel, Paolo Gasparini, Christian Gieger, Jost Bruno Jonas, Yoichiro Kamatani, Norihiro Kato, Jaspal S Kooner, Zoltán Kutalik, Markku Laakso, Cathy C Laurie, Karin Leander, Terho Lehtimäki, Lifelines Cohort Study, Patrik K E Magnusson, Albertine J Oldehinkel, Brenda W J H Penninx, Ozren Polasek, David J Porteous, Rainer Rauramaa, Nilesh J Samani, James Scott, Xiao-Ou Shu, Pim van der Harst, Lynne E Wagenknecht, Nicholas J Wareham, Hugh Watkins, David R Weir, Ananda R Wickremasinghe, Tangchun Wu, Wei Zheng, Claude Bouchard, Kaare Christensen, Michele K Evans, Vilmundur Gudnason, Bernardo L Horta, Sharon L R Kardia, Yongmei Liu, Alexandre C Pereira, Bruce M Psaty, Paul M Ridker, Rob M van Dam, W James Gauderman, Xiaofeng Zhu, Dennis O Mook-Kanamori, Myriam Fornage, Charles N Rotimi, L Adrienne Cupples, Tanika N Kelly, Ervin R Fox, Caroline Hayward, Cornelia M van Duijn, E Shyong Tai, Tien Yin Wong, Charles Kooperberg, Walter Palmas, Kenneth Rice, Alanna C Morrison, Paul Elliott, Mark J Caulfield, Patricia B Munroe, Dabeeru C Rao, Michael A Province, and Daniel Levy
Subjects: Medicine, Science
Abstract: Heavy alcohol consumption is an established risk factor for hypertension; the mechanism by which alcohol consumption impact blood pressure (BP) regulation remains unknown. We hypothesized that a genome-wide association study accounting for gene-alcohol consumption interaction for BP might identify additional BP loci and contribute to the understanding of alcohol-related BP regulation. We conducted a large two-stage investigation incorporating joint testing of main genetic effects and single nucleotide variant (SNV)-alcohol consumption interactions. In Stage 1, genome-wide discovery meta-analyses in ≈131K individuals across several ancestry groups yielded 3,514 SNVs (245 loci) with suggestive evidence of association (P < 1.0 x 10-5). In Stage 2, these SNVs were tested for independent external replication in ≈440K individuals across multiple ancestries. We identified and replicated (at Bonferroni correction threshold) five novel BP loci (380 SNVs in 21 genes) and 49 previously reported BP loci (2,159 SNVs in 109 genes) in European ancestry, and in multi-ancestry meta-analyses (P < 5.0 x 10-8). For African ancestry samples, we detected 18 potentially novel BP loci (P < 5.0 x 10-8) in Stage 1 that warrant further replication. Additionally, correlated meta-analysis identified eight novel BP loci (11 genes). Several genes in these loci (e.g., PINX1, GATA4, BLK, FTO and GABBR2) have been previously reported to be associated with alcohol consumption. These findings provide insights into the role of alcohol consumption in the genetic architecture of hypertension.
Published: 2018
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36. Adipose tissue depot volume relationships with spinal trabecular bone mineral density in African Americans with diabetes.

Author: Gary C Chan, Jasmin Divers, Gregory B Russell, Carl D Langefeld, Lynne E Wagenknecht, Jianzhao Xu, S Carrie Smith, Donald W Bowden, Thomas C Register, J Jeffrey Carr, Leon Lenchik, and Barry I Freedman
Subjects: Medicine, Science
Abstract: Changes in select adipose tissue volumes may differentially impact bone mineral density. This study was performed to assess cross-sectional and longitudinal relationships between computed tomography-determined visceral (VAT), subcutaneous (SAT), inter-muscular (IMAT), and pericardial adipose tissue (PAT) volumes with respective changes in thoracic vertebral and lumbar vertebral volumetric trabecular bone mineral density (vBMD) in African Americans with type 2 diabetes. Generalized linear models were fitted to test relationships between baseline and change in adipose volumes with change in vBMD in 300 African American-Diabetes Heart Study participants; adjustment was performed for age, sex, diabetes duration, study interval, smoking, hypertension, BMI, kidney function, and medications. Participants were 50% female with mean ± SD age 55.1±9.0 years, diabetes duration 10.2±7.2 years, and BMI 34.7±7.7 kg/m2. Over 5.3 ± 1.4 years, mean vBMD decreased in thoracic/lumbar spine, while mean adipose tissue volumes increased in SAT, IMAT, and PAT, but not VAT depots. In fully-adjusted models, changes in lumbar and thoracic vBMD were positively associated with change in SAT (β[SE] 0.045[0.011], p
Published: 2018
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37. Biogenesis and cytotoxicity of APOL1 renal risk variant proteins in hepatocytes and hepatoma cells

Author: Dongmei Cheng, Allison Weckerle, Yi Yu, Lijun Ma, Xuewei Zhu, Mariana Murea, Barry I. Freedman, John S. Parks, and Gregory S. Shelness
Subjects: apolipoproteins, apoptosis, liver, endoplasmic reticulum, apolipoprotein L1, Biochemistry, QD415-436
Abstract: Two APOL1 gene variants, which likely evolved to protect individuals from African sleeping sickness, are strongly associated with nondiabetic kidney disease in individuals with recent African ancestry. Consistent with its role in trypanosome killing, the pro-death APOL1 protein is toxic to most cells, but its mechanism of cell death is poorly understood and little is known regarding its intracellular trafficking and secretion. Because the liver appears to be the main source of circulating APOL1, we examined its secretory behavior and mechanism of toxicity in hepatoma cells and primary human hepatocytes. APOL1 is poorly secreted in vitro, even in the presence of chemical chaperones; however, it is efficiently secreted in wild-type transgenic mice, suggesting that APOL1 secretion has specialized requirements that cultured cells fail to support. In hepatoma cells, inducible expression of APOL1 and its risk variants promoted cell death, with the G1 variant displaying the highest degree of toxicity. To explore the basis for APOL1-mediated cell toxicity, endoplasmic reticulum stress, pyroptosis, autophagy, and apoptosis were examined. Our results suggest that autophagy represents the predominant mechanism of APOL1-mediated cell death. Overall, these results increase our understanding of the basic biology and trafficking behavior of circulating APOL1 from the liver.
Published: 2015
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38. Rare genetic variants explain missing heritability in smoking

Author: Seon-Kyeong Jang, Luke Evans, Allison Fialkowski, Donna K. Arnett, Allison E. Ashley-Koch, Kathleen C. Barnes, Diane M. Becker, Joshua C. Bis, John Blangero, Eugene R. Bleecker, Meher Preethi Boorgula, Donald W. Bowden, Jennifer A. Brody, Brian E. Cade, Brenda W. Campbell Jenkins, April P. Carson, Sameer Chavan, L. Adrienne Cupples, Brian Custer, Scott M. Damrauer, Sean P. David, Mariza de Andrade, Carla L. Dinardo, Tasha E. Fingerlin, Myriam Fornage, Barry I. Freedman, Melanie E. Garrett, Sina A. Gharib, David C. Glahn, Jeffrey Haessler, Susan R. Heckbert, John E. Hokanson, Lifang Hou, Shih-Jen Hwang, Matthew C. Hyman, Renae Judy, Anne E. Justice, Robert C. Kaplan, Sharon L. R. Kardia, Shannon Kelly, Wonji Kim, Charles Kooperberg, Daniel Levy, Donald M. Lloyd-Jones, Ruth J. F. Loos, Ani W. Manichaikul, Mark T. Gladwin, Lisa Warsinger Martin, Mehdi Nouraie, Olle Melander, Deborah A. Meyers, Courtney G. Montgomery, Kari E. North, Elizabeth C. Oelsner, Nicholette D. Palmer, Marinelle Payton, Anna L. Peljto, Patricia A. Peyser, Michael Preuss, Bruce M. Psaty, Dandi Qiao, Daniel J. Rader, Nicholas Rafaels, Susan Redline, Robert M. Reed, Alexander P. Reiner, Stephen S. Rich, Jerome I. Rotter, David A. Schwartz, Aladdin H. Shadyab, Edwin K. Silverman, Nicholas L. Smith, J. Gustav Smith, Albert V. Smith, Jennifer A. Smith, Weihong Tang, Kent D. Taylor, Marilyn J. Telen, Ramachandran S. Vasan, Victor R. Gordeuk, Zhe Wang, Kerri L. Wiggins, Lisa R. Yanek, Ivana V. Yang, Kendra A. Young, Kristin L. Young, Yingze Zhang, Dajiang J. Liu, Matthew C. Keller, and Scott Vrieze
Subjects: Social Psychology, Tobacco Smoke and Health, Smoking, Human Genome, Experimental and Cognitive Psychology, Single Nucleotide, Polymorphism, Single Nucleotide, Article, Behavioral Neuroscience, Phenotype, Gene Frequency, Tobacco, Genetics, Polymorphism, Genome-Wide Association Study, Cancer
Abstract: Common genetic variants explain less variation in complex phenotypes than inferred from family-based studies, and there is a debate on the source of this 'missing heritability'. We investigated the contribution of rare genetic variants to tobacco use with whole-genome sequences from up to 26,257 unrelated individuals of European ancestries and 11,743 individuals of African ancestries. Across four smoking traits, single-nucleotide-polymorphism-based heritability ([Formula: see text]) was estimated from 0.13 to 0.28 (s.e., 0.10-0.13) in European ancestries, with 35-74% of it attributable to rare variants with minor allele frequencies between 0.01% and 1%. These heritability estimates are 1.5-4 times higher than past estimates based on common variants alone and accounted for 60% to 100% of our pedigree-based estimates of narrow-sense heritability ([Formula: see text], 0.18-0.34). In the African ancestry samples, [Formula: see text] was estimated from 0.03 to 0.33 (s.e., 0.09-0.14) across the four smoking traits. These results suggest that rare variants are important contributors to the heritability of smoking.
Published: 2022

39. Recipient APOL1 Genotype Effects on Outcomes After Kidney Transplantation

Author: Alejandra M Mena-Gutierrez, Barry I. Freedman, and Lijun Ma
Subjects: medicine.medical_specialty, Nephrology, business.industry, Internal medicine, Genotype, MEDLINE, Medicine, business, medicine.disease, Kidney transplantation
Published: 2022

40. Diagnosis, Education, and Care of Patients with APOL1-Associated Nephropathy: A Delphi Consensus and Systematic Review

Author: Lucy Eberhard, Erika Blacksher, Michael E. Hall, Rasheed Gbadegesin, Glenda V. Roberts, John R. Sedor, Opeyemi A. Olabisi, Jasmin Divers, Jeffrey B. Kopp, Wylie Burke, Richard Knight, Tiffany Jones-Smith, Barry I. Freedman, Crystal A. Gadegbeku, Csaba P. Kovesdy, and Keith C. Norris
Subjects: medicine.medical_specialty, medicine.diagnostic_test, business.industry, Best practice, MEDLINE, General Medicine, Disease, medicine.disease, Health equity, Nephropathy, Clinical Research, Nephrology, Multidisciplinary approach, Family medicine, medicine, business, Genetic testing, Kidney disease
Abstract: Background APOL1 variants contribute to the markedly higher incidence of ESKD in Blacks compared with Whites. Genetic testing for these variants in patients with African ancestry who have nephropathy is uncommon, and no specific treatment or management protocol for APOL1-associated nephropathy currently exists. Methods A multidisciplinary, racially diverse group of 14 experts and patient advocates participated in a Delphi consensus process to establish practical guidance for clinicians caring for patients who may have APOL1-associated nephropathy. Consensus group members took part in three anonymous voting rounds to develop consensus statements relating to the following: (1) counseling, genotyping, and diagnosis; (2) disease awareness and education; and (3) a vision for management of APOL1-associated nephropathy in a future when treatment is available. A systematic literature search of the MEDLINE and Embase databases was conducted to identify relevant evidence published from January 1, 2009 to July 14, 2020. Results The consensus group agreed on 55 consensus statements covering such topics as demographic and clinical factors that suggest a patient has APOL1-associated nephropathy, as well as key considerations for counseling, testing, and diagnosis in current clinical practice. They achieved consensus on the need to increase awareness among key stakeholders of racial health disparities in kidney disease and of APOL1-associated nephropathy and on features of a successful education program to raise awareness among the patient community. The group also highlighted the unmet need for a specific treatment and agreed on best practice for management of these patients should a treatment become available. Conclusions A multidisciplinary group of experts and patient advocates defined consensus-based guidance on the care of patients who may have APOL1-associated nephropathy.
Published: 2021

41. APOL1 at 10 years: progress and next steps

Author: Barry I. Freedman, Matthew G. Sampson, Jeffrey B. Kopp, and Katalin Susztak
Subjects: 0301 basic medicine, Apolipoprotein L1, 030232 urology & nephrology, Disease, Kidney, Bioinformatics, Article, Nephropathy, 03 medical and health sciences, 0302 clinical medicine, medicine, Humans, Genetic Predisposition to Disease, Genotyping, biology, business.industry, Glomerulosclerosis, medicine.disease, Phenotype, 030104 developmental biology, medicine.anatomical_structure, Haplotypes, Nephrology, biology.protein, Kidney Diseases, business, Kidney disease
Abstract: APOL1 kidney risk variants (RVs) were identified in 2010 as major drivers of glomerular, tubulointerstitial and renal microvascular disease in individuals with sub-Saharan African ancestry. In December 2020, the “APOL1 at Ten” conference summarized the first decade of progress and discussed controversies and uncertainties that remain to be addressed. Topics included trypanosome infection and its role in the evolution of APOL1 kidney RVs, clinical phenotypes in APOL1-associated nephropathy, relationships between APOL1 RVs and background haplotypes on cell injury and molecular mechanisms initiating disease, the role of clinical APOL1 genotyping, and development of novel therapies for kidney disease. Future goals were defined, including improved characterization of various APOL1 RV phenotypes in patients and experimental pre-clinical models; further dissection of APOL1-mediated pathways to cellular injury and dysfunction in kidney (and other) cells; clarification of gene-gene and gene-environment interactions; and evaluation of the role for existing and novel therapies.
Published: 2021

42. Discovery and fine-mapping of adiposity loci using high density imputation of genome-wide association studies in individuals of African ancestry: African Ancestry Anthropometry Genetics Consortium.

Author: Maggie C Y Ng, Mariaelisa Graff, Yingchang Lu, Anne E Justice, Poorva Mudgal, Ching-Ti Liu, Kristin Young, Lisa R Yanek, Mary F Feitosa, Mary K Wojczynski, Kristin Rand, Jennifer A Brody, Brian E Cade, Latchezar Dimitrov, Qing Duan, Xiuqing Guo, Leslie A Lange, Michael A Nalls, Hayrettin Okut, Salman M Tajuddin, Bamidele O Tayo, Sailaja Vedantam, Jonathan P Bradfield, Guanjie Chen, Wei-Min Chen, Alessandra Chesi, Marguerite R Irvin, Badri Padhukasahasram, Jennifer A Smith, Wei Zheng, Matthew A Allison, Christine B Ambrosone, Elisa V Bandera, Traci M Bartz, Sonja I Berndt, Leslie Bernstein, William J Blot, Erwin P Bottinger, John Carpten, Stephen J Chanock, Yii-Der Ida Chen, David V Conti, Richard S Cooper, Myriam Fornage, Barry I Freedman, Melissa Garcia, Phyllis J Goodman, Yu-Han H Hsu, Jennifer Hu, Chad D Huff, Sue A Ingles, Esther M John, Rick Kittles, Eric Klein, Jin Li, Barbara McKnight, Uma Nayak, Barbara Nemesure, Adesola Ogunniyi, Andrew Olshan, Michael F Press, Rebecca Rohde, Benjamin A Rybicki, Babatunde Salako, Maureen Sanderson, Yaming Shao, David S Siscovick, Janet L Stanford, Victoria L Stevens, Alex Stram, Sara S Strom, Dhananjay Vaidya, John S Witte, Jie Yao, Xiaofeng Zhu, Regina G Ziegler, Alan B Zonderman, Adebowale Adeyemo, Stefan Ambs, Mary Cushman, Jessica D Faul, Hakon Hakonarson, Albert M Levin, Katherine L Nathanson, Erin B Ware, David R Weir, Wei Zhao, Degui Zhi, Bone Mineral Density in Childhood Study (BMDCS) Group, Donna K Arnett, Struan F A Grant, Sharon L R Kardia, Olufunmilayo I Oloapde, D C Rao, Charles N Rotimi, Michele M Sale, L Keoki Williams, Babette S Zemel, Diane M Becker, Ingrid B Borecki, Michele K Evans, Tamara B Harris, Joel N Hirschhorn, Yun Li, Sanjay R Patel, Bruce M Psaty, Jerome I Rotter, James G Wilson, Donald W Bowden, L Adrienne Cupples, Christopher A Haiman, Ruth J F Loos, and Kari E North
Subjects: Genetics, QH426-470
Abstract: Genome-wide association studies (GWAS) have identified >300 loci associated with measures of adiposity including body mass index (BMI) and waist-to-hip ratio (adjusted for BMI, WHRadjBMI), but few have been identified through screening of the African ancestry genomes. We performed large scale meta-analyses and replications in up to 52,895 individuals for BMI and up to 23,095 individuals for WHRadjBMI from the African Ancestry Anthropometry Genetics Consortium (AAAGC) using 1000 Genomes phase 1 imputed GWAS to improve coverage of both common and low frequency variants in the low linkage disequilibrium African ancestry genomes. In the sex-combined analyses, we identified one novel locus (TCF7L2/HABP2) for WHRadjBMI and eight previously established loci at P < 5×10-8: seven for BMI, and one for WHRadjBMI in African ancestry individuals. An additional novel locus (SPRYD7/DLEU2) was identified for WHRadjBMI when combined with European GWAS. In the sex-stratified analyses, we identified three novel loci for BMI (INTS10/LPL and MLC1 in men, IRX4/IRX2 in women) and four for WHRadjBMI (SSX2IP, CASC8, PDE3B and ZDHHC1/HSD11B2 in women) in individuals of African ancestry or both African and European ancestry. For four of the novel variants, the minor allele frequency was low (
Published: 2017
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43. Urine APOL1 Isoforms Reflect Plasma-Derived Liver-Synthesized Proteins

Author: Peter J. Greasley, Pamela J. Hicks, Michael D. Gautreaux, Magnus Althage, Iain MacPhee, Lijun Ma, Tasso Miliotis, Barry I. Freedman, Nicholette D. Palmer, Anna Bogstedt, Timothy M. Heinrich, and Judith Hartleib-Geschwindner
Subjects: Adult, Male, Gene isoform, Pathology, medicine.medical_specialty, Genotype, Urine, Kidney, End stage renal disease, Focal segmental glomerulosclerosis, Humans, Protein Isoforms, Medicine, Postoperative Period, Kidney transplantation, Aged, business.industry, Genetic Variation, General Medicine, Middle Aged, Apolipoprotein L1, medicine.disease, Kidney Transplantation, Research Letters, Human genetics, medicine.anatomical_structure, Nephrology, Female, business, Kidney disease
Published: 2021

44. Intensive Blood Pressure Control, APOL1 Genotype, and Kidney Outcomes in Individuals With Type 2 Diabetes: A Post Hoc Analysis of the Action to Control Cardiovascular Risk in Diabetes-Blood Pressure (ACCORD-BP) Trial

Author: Charles E. McCulloch, Timothy P. Copeland, Elaine Ku, Barry I. Freedman, and Alex Dinh
Subjects: Blood pressure control, medicine.medical_specialty, Kidney, business.industry, Type 2 diabetes, medicine.disease, Diseases of the genitourinary system. Urology, Blood pressure, medicine.anatomical_structure, Nephrology, Internal medicine, Diabetes mellitus, Post-hoc analysis, Genotype, Internal Medicine, Cardiology, medicine, RC870-923, business
Published: 2021

45. Development and evaluation of deep learning–based segmentation of histologic structures in the kidney cortex with multiple histologic stains

Author: Kshama R. Mehta, Catherine P. Jayapandian, Alessia Fornoni, John R. Sedor, Sangeeta Hingorani, Barry I. Freedman, M. Bray, M. Schachere, Christine B. Sethna, L. Barisoni, A. Cooper, Matthias Kretzler, Miroslav Sekulic, Anne Froment, Lawrence A. Greenbaum, J. Blake, Jeffrey B. Kopp, M. Toledo, Yijiang Chen, J. Lalli, Richard A. Lafayette, M. Romano, Duncan B. Johnstone, Katherine R. Tuttle, Katherine MacRae Dell, Kamal Sambandam, Matthew B. Palmer, Marie C. Hogan, J. LaVigne, Frederick J. Kaskel, E. Lim, M. Rogers, Z. Wang, J. Negrey, S. Boynton, Fernando C. Fervenza, Deb Gipson, Vimal K. Derebail, Anant Madabhushi, Sharon G. Adler, Stephen M. Hewitt, Jen Jar Lin, Cynthia C. Nast, John H. Stroger, Clarissa A. Cassol, S. Grubbs, Laura Barisoni, Kevin E.C. Meyers, C. Kang, Jeffrey B. Hodgin, Paula Toro, Ambarish M. Athavale, Frank Modersitzki, Mathew Itteera, Olga Zhdanova, John C. Lieske, Heather N. Reich, G B Appel, John F. O’Toole, Howard Trachtman, S. Quinn-Boyle, Andrew Janowczyk, Suzanne Vento, Alicia M. Neu, Vladimir Chernitskiy, A. Jefferson, M. Kelton, Dan Cattran, Crystal A. Gadegbeku, P. Flynn, N. Kumar, Krishna Kallem, C. Bidot, Michelle Hladunewich, Keisha L. Gibson, Kevin V. Lemley, J. LaPage, A. Garrett, Lawrence B. Holzman, A. Williams, Tarak Srivastava, P. Ling, Jarcy Zee, K. Laurent, and Chia-shi Wang
Subjects: 0301 basic medicine, Kidney Cortex, Biopsy, 030232 urology & nephrology, H&E stain, Magnification, Kidney, Peritubular capillaries, 03 medical and health sciences, Deep Learning, 0302 clinical medicine, Trichrome, Medicine, Segmentation, Tuft, Coloring Agents, medicine.diagnostic_test, urogenital system, business.industry, Digital pathology, Anatomy, 030104 developmental biology, medicine.anatomical_structure, Nephrology, business
Abstract: The application of deep learning for automated segmentation (delineation of boundaries) of histologic primitives (structures) from whole slide images can facilitate the establishment of novel protocols for kidney biopsy assessment. Here, we developed and validated deep learning networks for the segmentation of histologic structures on kidney biopsies and nephrectomies. For development, we examined 125 biopsies for Minimal Change Disease collected across 29 NEPTUNE enrolling centers along with 459 whole slide images stained with Hematoxylin & Eosin (125), Periodic Acid Schiff (125), Silver (102), and Trichrome (107) divided into training, validation and testing sets (ratio 6:1:3). Histologic structures were manually segmented (30048 total annotations) by five nephropathologists. Twenty deep learning models were trained with optimal digital magnification across the structures and stains. Periodic Acid Schiff-stained whole slide images yielded the best concordance between pathologists and deep learning segmentation across all structures (F-scores: 0.93 for glomerular tufts, 0.94 for glomerular tuft plus Bowman's capsule, 0.91 for proximal tubules, 0.93 for distal tubular segments, 0.81 for peritubular capillaries, and 0.85 for arteries and afferent arterioles). Optimal digital magnifications were 5X for glomerular tuft/tuft plus Bowman's capsule, 10X for proximal/distal tubule, arteries and afferent arterioles, and 40X for peritubular capillaries. Silver stained whole slide images yielded the worst deep learning performance. Thus, this largest study to date adapted deep learning for the segmentation of kidney histologic structures across multiple stains and pathology laboratories. All data used for training and testing and a detailed online tutorial will be publicly available.
Published: 2021

46. APOL1 Risk Variants Impair Multiple Mitochondrial Pathways in a Metabolomics Analysis

Author: Young A Choi, Barry I. Freedman, Carl D. Langefeld, John S. Parks, James A. Snipes, Nicholette D. Palmer, Lijun Ma, and Mariana Murea
Subjects: 0303 health sciences, biology, business.industry, Apolipoprotein L1, HEK 293 cells, 030232 urology & nephrology, Original Investigations, General Medicine, Computational biology, medicine.disease, Nephropathy, Citric acid cycle, 03 medical and health sciences, 0302 clinical medicine, Metabolomics, biology.protein, Medicine, business, Inner mitochondrial membrane, Gene, Beta oxidation, 030304 developmental biology
Abstract: Background: Kidney risk variants (KRVs) in the apolipoprotein L1 gene (APOL1) are associated with mitochondrial dysfunction. However, the molecular spectrum of metabolites impacted by the G1 and G2 KRVs and the downstream mitochondrial pathways they affect remain unknown. Methods: We performed a metabolomics analysis using HEK293 Tet-on cells conditionally expressing APOL1 G0, and G1 and G2 KRVs to determine the patterns of metabolites and pathways potentially involved in nephropathy. Welch9s two-sample t-test, matched pairs t-test, and two-way repeated measures ANOVA were employed to identify differential metabolites. Random Forest, a supervised classification algorithm that uses an ensemble of decision trees, and the mean decrease accuracy (MDA) metric were applied to prioritize top metabolites. Results: Alterations in the tricarboxylic acid cycle, increased fatty acid oxidation, and compromised redox homeostasis were the major pathways impacted by overexpression of APOL1 KRVs. Conclusion: Impairment of mitochondrial membrane respiratory chain complex I appeared to account for critical metabolic consequences of APOL1 KRVs. This finding supports depletion of the mitochondrial membrane potential, as has been reported.
Published: 2020

47. Effects of Intensive Systolic Blood Pressure Control on All-Cause Hospitalizations

Author: Michael V. Rocco, Amret T. Hawfield, Miranda C. Marion, Carl D. Langefeld, Barry I. Freedman, and Mary E. Comeau
Subjects: Male, Blood pressure control, medicine.medical_specialty, Blood Pressure, 030204 cardiovascular system & hematology, Article, 03 medical and health sciences, 0302 clinical medicine, Risk Factors, Internal medicine, Post-hoc analysis, Internal Medicine, medicine, Humans, 030212 general & internal medicine, Intervention trial, Antihypertensive Agents, Aged, business.industry, Blood Pressure Determination, Middle Aged, Hospitalization, Treatment Outcome, Blood pressure, Hypertension, Cardiology, Female, business, All cause mortality
Abstract: Intensive blood pressure control decreases the rate of cardiovascular events by >25% compared with standard blood pressure control. We sought to determine whether the decrease in cardiovascular events seen with intensive blood pressure control is associated with an increased rate of other causes of hospitalization. This is a post hoc analysis of SPRINT (Systolic Blood Pressure Intervention Trial) in 9361 adult participants with hypertension and elevated cardiovascular risk. Participants were randomly assigned to an intensive or standard systolic blood pressure goal (P =0.37). Equivalence testing shows that these hospitalization rates were statistically equivalent at the P =0.05 level. Of those with hospitalizations, >1 hospitalization was seen in 38.8% of intensive arm participants and 41.9% of standard arm participants ( P =0.08). The mean cumulative count of nonprimary event hospitalizations was comparable between the two arms. The most common causes of hospitalization were cardiovascular (23.6%) followed by injuries, including bone and joint therapeutic procedures (15.7%), infections (12.0%), and nervous systems disorders (10.7%). No categories of hospitalization were statistically more common in the intensive arm compared with the standard arm. Thus, the decrease in cardiovascular events seen with intensive blood pressure control is not associated with an increased rate of other causes of hospitalization. Registration— URL: https://www.clinicaltrials.gov ; Unique identifier: NCT01206062.
Published: 2020

48. Mendelian randomization supports bidirectional causality between telomere length and clonal hematopoiesis of indeterminate potential

Author: Tetsushi, Nakao, Alexander G, Bick, Margaret A, Taub, Seyedeh M, Zekavat, Md M, Uddin, Abhishek, Niroula, Cara L, Carty, John, Lane, Michael C, Honigberg, Joshua S, Weinstock, Akhil, Pampana, Christopher J, Gibson, Gabriel K, Griffin, Shoa L, Clarke, Romit, Bhattacharya, Themistocles L, Assimes, Leslie S, Emery, Adrienne M, Stilp, Quenna, Wong, Jai, Broome, Cecelia A, Laurie, Alyna T, Khan, Albert V, Smith, Thomas W, Blackwell, Veryan, Codd, Christopher P, Nelson, Zachary T, Yoneda, Juan M, Peralta, Donald W, Bowden, Marguerite R, Irvin, Meher, Boorgula, Wei, Zhao, Lisa R, Yanek, Kerri L, Wiggins, James E, Hixson, C Charles, Gu, Gina M, Peloso, Dan M, Roden, Muagututi'a S, Reupena, Chii-Min, Hwu, Dawn L, DeMeo, Kari E, North, Shannon, Kelly, Solomon K, Musani, Joshua C, Bis, Donald M, Lloyd-Jones, Jill M, Johnsen, Michael, Preuss, Russell P, Tracy, Patricia A, Peyser, Dandi, Qiao, Pinkal, Desai, Joanne E, Curran, Barry I, Freedman, Hemant K, Tiwari, Sameer, Chavan, Jennifer A, Smith, Nicholas L, Smith, Tanika N, Kelly, Bertha, Hidalgo, L Adrienne, Cupples, Daniel E, Weeks, Nicola L, Hawley, Ryan L, Minster, Ranjan, Deka, Take T, Naseri, Lisa, de Las Fuentes, Laura M, Raffield, Alanna C, Morrison, Paul S, Vries, Christie M, Ballantyne, Eimear E, Kenny, Stephen S, Rich, Eric A, Whitsel, Michael H, Cho, M Benjamin, Shoemaker, Betty S, Pace, John, Blangero, Nicholette D, Palmer, Braxton D, Mitchell, Alan R, Shuldiner, Kathleen C, Barnes, Susan, Redline, Sharon L R, Kardia, Gonçalo R, Abecasis, Lewis C, Becker, Susan R, Heckbert, Jiang, He, Wendy, Post, Donna K, Arnett, Ramachandran S, Vasan, Dawood, Darbar, Scott T, Weiss, Stephen T, McGarvey, Mariza, de Andrade, Yii-Der Ida, Chen, Robert C, Kaplan, Deborah A, Meyers, Brian S, Custer, Adolfo, Correa, Bruce M, Psaty, Myriam, Fornage, JoAnn E, Manson, Eric, Boerwinkle, Barbara A, Konkle, Ruth J F, Loos, Jerome I, Rotter, Edwin K, Silverman, Charles, Kooperberg, John, Danesh, Nilesh J, Samani, Siddhartha, Jaiswal, Peter, Libby, Patrick T, Ellinor, Nathan, Pankratz, Benjamin L, Ebert, Alexander P, Reiner, Rasika A, Mathias, Ron, Do, and Pradeep, Natarajan
Subjects: Multidisciplinary
Abstract: Human genetic studies support an inverse causal relationship between leukocyte telomere length (LTL) and coronary artery disease (CAD), but directionally mixed effects for LTL and diverse malignancies. Clonal hematopoiesis of indeterminate potential (CHIP), characterized by expansion of hematopoietic cells bearing leukemogenic mutations, predisposes both hematologic malignancy and CAD. TERT (which encodes telomerase reverse transcriptase) is the most significantly associated germline locus for CHIP in genome-wide association studies. Here, we investigated the relationship between CHIP, LTL, and CAD in the Trans-Omics for Precision Medicine (TOPMed) program ( n = 63,302) and UK Biobank ( n = 47,080). Bidirectional Mendelian randomization studies were consistent with longer genetically imputed LTL increasing propensity to develop CHIP, but CHIP then, in turn, hastens to shorten measured LTL (mLTL). We also demonstrated evidence of modest mediation between CHIP and CAD by mLTL. Our data promote an understanding of potential causal relationships across CHIP and LTL toward prevention of CAD.
Published: 2022

49. APOL1-associated kidney disease in northern Nigerians with treated HIV infection

Author: Barry I. Freedman and Opeyemi A. Olabisi
Subjects: 0301 basic medicine, Kidney, medicine.medical_specialty, Proteinuria, biology, business.industry, Apolipoprotein L1, Nigerians, Incidence (epidemiology), 030232 urology & nephrology, Renal function, medicine.disease, Article, Nephropathy, 03 medical and health sciences, 030104 developmental biology, 0302 clinical medicine, medicine.anatomical_structure, Nephrology, Internal medicine, medicine, biology.protein, medicine.symptom, business, Kidney disease
Abstract: Apolipoprotein L1 (APOL1) high-risk genotypes strongly associate with HIV-associated nephropathy, and antiretroviral therapy reduces the incidence of HIV-associated nephropathy and progression to end-stage kidney disease. Wudil et al. report cross-sectional APOL1 associations with proteinuria and estimated glomerular filtration rate in a northern Nigerian sample with HIV infection on antiretroviral therapy. Multiple ethnic groups with different APOL1 risk variant frequencies were included. Overall, APOL1 was associated with proteinuric chronic kidney disease; however, relationships with underlying causes of nephropathy and progression rates require further study.
Published: 2021

50. Deceased-Donor Apolipoprotein L1 Renal-Risk Variants Have Minimal Effects on Liver Transplant Outcomes.

Author: Casey R Dorr, Barry I Freedman, Pamela J Hicks, W Mark Brown, Gregory B Russell, Bruce A Julian, Stephen O Pastan, Michael D Gautreaux, Amutha Muthusamy, Srinath Chinnakotla, Vera Hauptfeld, Robert A Bray, Allan D Kirk, Jasmin Divers, and Ajay K Israni
Subjects: Medicine, Science
Abstract: BACKGROUND:Apolipoprotein L1 gene (APOL1) G1 and G2 renal-risk variants, common in populations with recent African ancestry, are strongly associated with non-diabetic nephropathy, end-stage kidney disease, and shorter allograft survival in deceased-donor kidneys (autosomal recessive inheritance). Circulating APOL1 protein is synthesized primarily in the liver and hydrodynamic gene delivery of APOL1 G1 and G2 risk variants has caused hepatic necrosis in a murine model. METHODS:To evaluate the impact of these variants in liver transplantation, this multicenter study investigated the association of APOL1 G1 and G2 alleles in deceased African American liver donors with allograft survival. Transplant recipients were followed for liver allograft survival using data from the Scientific Registry of Transplant Recipients. RESULTS:Of the 639 liver donors evaluated, 247 had no APOL1 risk allele, 300 had 1 risk allele, and 92 had 2 risk alleles. Graft failure assessed at 15 days, 6 months, 1 year and total was not significantly associated with donor APOL1 genotype (p-values = 0.25, 0.19, 0.67 and 0.89, respectively). CONCLUSIONS:In contrast to kidney transplantation, deceased-donor APOL1 G1 and G2 risk variants do not significantly impact outcomes in liver transplantation.
Published: 2016
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