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1. Pathogenic Huntingtin Repeat Expansions in Patients with Frontotemporal Dementia and Amyotrophic Lateral Sclerosis

Author

Dewan, Ramita, Chia, Ruth, Ding, Jinhui, Hickman, Richard A, Stein, Thor D, Abramzon, Yevgeniya, Ahmed, Sarah, Sabir, Marya S, Portley, Makayla K, Tucci, Arianna, Ibáñez, Kristina, Shankaracharya, FNU, Keagle, Pamela, Rossi, Giacomina, Caroppo, Paola, Tagliavini, Fabrizio, Waldo, Maria L, Johansson, Per M, Nilsson, Christer F, Rowe, James B, Benussi, Luisa, Binetti, Giuliano, Ghidoni, Roberta, Jabbari, Edwin, Viollet, Coralie, Glass, Jonathan D, Singleton, Andrew B, Silani, Vincenzo, Ross, Owen A, Ryten, Mina, Torkamani, Ali, Tanaka, Toshiko, Ferrucci, Luigi, Resnick, Susan M, Pickering-Brown, Stuart, Brady, Christopher B, Kowal, Neil, Hardy, John A, Van Deerlin, Vivianna, Vonsattel, Jean Paul, Harms, Matt, Morris, Christopher M, Ferrari, Raffaele, Landers, John E, Chiò, Adriano, Gibbs, Jesse Raphael, Dalgard, Clifton L, Scholz, Sonja W, Traynor, Bryan J, Adeleye, Adelani, Alba, Camille, Bacikova, Dagmar, Hupalo, Daniel N, Martinez, Elisa McGrath, Pollard, Harvey B, Sukumar, Gauthaman, Soltis, Anthony R, Tuck, Meila, Zhang, Xijun, Wilkerson, Matthew D, Smith, Bradley N, Ticozzi, Nicola, Fallini, Claudia, Gkazi, Athina Soragia, Topp, Simon D, Kost, Jason, Scotter, Emma L, Kenna, Kevin P, Miller, Jack W, Tiloca, Cinzia, Vance, Caroline, Danielson, Eric W, Troakes, Claire, Colombrita, Claudia, Al-Sarraj, Safa, Lewis, Elizabeth A, King, Andrew, Calini, Daniela, Pensato, Viviana, Castellotti, Barbara, de Belleroche, Jacqueline, Baas, Frank, Asbroek, Anneloor LMA ten, Sapp, Peter C, McKenna-Yasek, Diane, McLaughlin, Russell L, Polak, Meraida, Asress, Seneshaw, Esteban-Pérez, Jesús, Muñoz-Blanco, José Luis, Stevic, Zorica, D’Alfonso, Sandra, Mazzini, Letizia, Comi, Giacomo P, Del Bo, Roberto, Ceroni, Mauro, Gagliardi, Stella, Querin, Giorgia, Bertolin, Cinzia, and van Rheenen, Wouter

Subjects
Genetics, Alzheimer's Disease including Alzheimer's Disease Related Dementias (AD/ADRD), Clinical Research, Neurodegenerative, Acquired Cognitive Impairment, Dementia, Frontotemporal Dementia (FTD), Alzheimer's Disease Related Dementias (ADRD), ALS, Rare Diseases, Brain Disorders, Neurosciences, Huntington's Disease, 2.1 Biological and endogenous factors, Aetiology, Neurological, Amyotrophic Lateral Sclerosis, DNA Repeat Expansion, Frontotemporal Dementia, Humans, Huntingtin Protein, Mutation, Whole Genome Sequencing, American Genome Center, FALS Sequencing Consortium, Genomics England Research Consortium, International ALS/FTD Genomics Consortium, International FTD Genetics Consortium, International LBD Genomics Consortium, NYGC ALS Consortium, PROSPECT Consortium, amyotrophic lateral sclerosis, frontotemporal dementia, huntingtin, repeat expansions, whole-genome sequencing, Psychology, Cognitive Sciences, Neurology & Neurosurgery
Abstract

We examined the role of repeat expansions in the pathogenesis of frontotemporal dementia (FTD) and amyotrophic lateral sclerosis (ALS) by analyzing whole-genome sequence data from 2,442 FTD/ALS patients, 2,599 Lewy body dementia (LBD) patients, and 3,158 neurologically healthy subjects. Pathogenic expansions (range, 40-64 CAG repeats) in the huntingtin (HTT) gene were found in three (0.12%) patients diagnosed with pure FTD/ALS syndromes but were not present in the LBD or healthy cohorts. We replicated our findings in an independent collection of 3,674 FTD/ALS patients. Postmortem evaluations of two patients revealed the classical TDP-43 pathology of FTD/ALS, as well as huntingtin-positive, ubiquitin-positive aggregates in the frontal cortex. The neostriatal atrophy that pathologically defines Huntington's disease was absent in both cases. Our findings reveal an etiological relationship between HTT repeat expansions and FTD/ALS syndromes and indicate that genetic screening of FTD/ALS patients for HTT repeat expansions should be considered.

Published
2021

2. Genome-wide Analyses Identify KIF5A as a Novel ALS Gene.

Author

Nicolas, Aude, Kenna, Kevin P, Renton, Alan E, Ticozzi, Nicola, Faghri, Faraz, Chia, Ruth, Dominov, Janice A, Kenna, Brendan J, Nalls, Mike A, Keagle, Pamela, Rivera, Alberto M, van Rheenen, Wouter, Murphy, Natalie A, van Vugt, Joke JFA, Geiger, Joshua T, Van der Spek, Rick A, Pliner, Hannah A, Shankaracharya, Smith, Bradley N, Marangi, Giuseppe, Topp, Simon D, Abramzon, Yevgeniya, Gkazi, Athina Soragia, Eicher, John D, Kenna, Aoife, ITALSGEN Consortium, Mora, Gabriele, Calvo, Andrea, Mazzini, Letizia, Riva, Nilo, Mandrioli, Jessica, Caponnetto, Claudia, Battistini, Stefania, Volanti, Paolo, La Bella, Vincenzo, Conforti, Francesca L, Borghero, Giuseppe, Messina, Sonia, Simone, Isabella L, Trojsi, Francesca, Salvi, Fabrizio, Logullo, Francesco O, D'Alfonso, Sandra, Corrado, Lucia, Capasso, Margherita, Ferrucci, Luigi, Genomic Translation for ALS Care (GTAC) Consortium, Moreno, Cristiane de Araujo Martins, Kamalakaran, Sitharthan, Goldstein, David B, ALS Sequencing Consortium, Gitler, Aaron D, Harris, Tim, Myers, Richard M, NYGC ALS Consortium, Phatnani, Hemali, Musunuri, Rajeeva Lochan, Evani, Uday Shankar, Abhyankar, Avinash, Zody, Michael C, Answer ALS Foundation, Kaye, Julia, Finkbeiner, Steven, Wyman, Stacia K, LeNail, Alex, Lima, Leandro, Fraenkel, Ernest, Svendsen, Clive N, Thompson, Leslie M, Van Eyk, Jennifer E, Berry, James D, Miller, Timothy M, Kolb, Stephen J, Cudkowicz, Merit, Baxi, Emily, Clinical Research in ALS and Related Disorders for Therapeutic Development (CReATe) Consortium, Benatar, Michael, Taylor, J Paul, Rampersaud, Evadnie, Wu, Gang, Wuu, Joanne, SLAGEN Consortium, Lauria, Giuseppe, Verde, Federico, Fogh, Isabella, Tiloca, Cinzia, Comi, Giacomo P, Sorarù, Gianni, Cereda, Cristina, French ALS Consortium, Corcia, Philippe, Laaksovirta, Hannu, Myllykangas, Liisa, Jansson, Lilja, Valori, Miko, Ealing, John, Hamdalla, Hisham, Rollinson, Sara, Pickering-Brown, Stuart, and Orrell, Richard W

Subjects
ITALSGEN Consortium, Genomic Translation for ALS Care (GTAC) Consortium, ALS Sequencing Consortium, NYGC ALS Consortium, Answer ALS Foundation, Clinical Research in ALS and Related Disorders for Therapeutic Development (CReATe) Consortium, SLAGEN Consortium, French ALS Consortium, Project MinE ALS Sequencing Consortium, Humans, Amyotrophic Lateral Sclerosis, Cohort Studies, Amino Acid Sequence, Adult, Aged, Aged, 80 and over, Middle Aged, Female, Male, Genome-Wide Association Study, Young Adult, Loss of Function Mutation, Kinesins, ALS, GWAS, KIF5A, WES, WGS, axonal transport, cargo, Brain Disorders, Genetics, Human Genome, Rare Diseases, Neurosciences, Neurodegenerative, Aetiology, 2.1 Biological and endogenous factors, Neurological, Psychology, Cognitive Sciences, Neurology & Neurosurgery
Abstract

To identify novel genes associated with ALS, we undertook two lines of investigation. We carried out a genome-wide association study comparing 20,806 ALS cases and 59,804 controls. Independently, we performed a rare variant burden analysis comparing 1,138 index familial ALS cases and 19,494 controls. Through both approaches, we identified kinesin family member 5A (KIF5A) as a novel gene associated with ALS. Interestingly, mutations predominantly in the N-terminal motor domain of KIF5A are causative for two neurodegenerative diseases: hereditary spastic paraplegia (SPG10) and Charcot-Marie-Tooth type 2 (CMT2). In contrast, ALS-associated mutations are primarily located at the C-terminal cargo-binding tail domain and patients harboring loss-of-function mutations displayed an extended survival relative to typical ALS cases. Taken together, these results broaden the phenotype spectrum resulting from mutations in KIF5A and strengthen the role of cytoskeletal defects in the pathogenesis of ALS.

Published
2018

3. Exome-wide rare variant analysis identifies TUBA4A mutations associated with familial ALS.

Author

Smith BN, Ticozzi N, Fallini C, Gkazi AS, Topp S, Kenna KP, Scotter EL, Kost J, Keagle P, Miller JW, Calini D, Vance C, Danielson EW, Troakes C, Tiloca C, Al-Sarraj S, Lewis EA, King A, Colombrita C, Pensato V, Castellotti B, de Belleroche J, Baas F, ten Asbroek AL, Sapp PC, McKenna-Yasek D, McLaughlin RL, Polak M, Asress S, Esteban-Pérez J, Muñoz-Blanco JL, Simpson M, van Rheenen W, Diekstra FP, Lauria G, Duga S, Corti S, Cereda C, Corrado L, Sorarù G, Morrison KE, Williams KL, Nicholson GA, Blair IP, Dion PA, Leblond CS, Rouleau GA, Hardiman O, Veldink JH, van den Berg LH, Al-Chalabi A, Pall H, Shaw PJ, Turner MR, Talbot K, Taroni F, García-Redondo A, Wu Z, Glass JD, Gellera C, Ratti A, Brown RH Jr, Silani V, Shaw CE, and Landers JE

Subjects
Brain metabolism, Brain pathology, Humans, Neurons metabolism, Sequence Analysis, DNA, Tubulin metabolism, Amyotrophic Lateral Sclerosis genetics, Exome genetics, Genetic Predisposition to Disease, Mutation genetics, Tubulin genetics
Abstract

Exome sequencing is an effective strategy for identifying human disease genes. However, this methodology is difficult in late-onset diseases where limited availability of DNA from informative family members prohibits comprehensive segregation analysis. To overcome this limitation, we performed an exome-wide rare variant burden analysis of 363 index cases with familial ALS (FALS). The results revealed an excess of patient variants within TUBA4A, the gene encoding the Tubulin, Alpha 4A protein. Analysis of a further 272 FALS cases and 5,510 internal controls confirmed the overrepresentation as statistically significant and replicable. Functional analyses revealed that TUBA4A mutants destabilize the microtubule network, diminishing its repolymerization capability. These results further emphasize the role of cytoskeletal defects in ALS and demonstrate the power of gene-based rare variant analyses in situations where causal genes cannot be identified through traditional segregation analysis.

Published
2014
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