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5 results on '"Van Rensburg, EJ"'

1. BRCA1 and BRCA2 pathogenic sequence variants in women of African origin or ancestry.

Author

Friebel TM, Andrulis IL, Balmaña J, Blanco AM, Couch FJ, Daly MB, Domchek SM, Easton DF, Foulkes WD, Ganz PA, Garber J, Glendon G, Greene MH, Hulick PJ, Isaacs C, Jankowitz RC, Karlan BY, Kirk J, Kwong A, Lee A, Lesueur F, Lu KH, Nathanson KL, Neuhausen SL, Offit K, Palmero EI, Sharma P, Tischkowitz M, Toland AE, Tung N, van Rensburg EJ, Vega A, Weitzel JN, Collaborators GS, Hoskins KF, Maga T, Parsons MT, McGuffog L, Antoniou AC, Chenevix-Trench G, Huo D, Olopade OI, and Rebbeck TR

Subjects
Alleles, Female, Genetic Association Studies, Humans, Mutation, Population Surveillance, BRCA1 Protein genetics, BRCA2 Protein genetics, Black People genetics, Genetic Predisposition to Disease, Genetic Variation
Abstract

BRCA1 and BRCA2 (BRCA1/2) pathogenic sequence variants (PSVs) confer elevated risks of multiple cancers. However, most BRCA1/2 PSVs reports focus on European ancestry individuals. Knowledge of the PSV distribution in African descent individuals is poorly understood. We undertook a systematic review of the published literature and publicly available databases reporting BRCA1/2 PSVs also accessed the Consortium of Investigators of Modifiers of BRCA1/2 (CIMBA) database to identify African or African descent individuals. Using these data, we inferred which of the BRCA PSVs were likely to be of African continental origin. Of the 43,817 BRCA1/2 PSV carriers in the CIMBA database, 469 (1%) were of African descent. Additional African descent individuals were identified in public databases (n = 291) and the literature (n = 601). We identified 164 unique BRCA1 and 173 unique BRCA2 PSVs in individuals of African ancestry. Of these, 83 BRCA1 and 91 BRCA2 PSVs are of likely or possible African origin. We observed numerous differences in the distribution of PSV type and function in African origin versus non-African origin PSVs. Research in populations of African ancestry with BRCA1/2 PSVs is needed to provide the information needed for clinical management and decision-making in African descent individuals worldwide., (© 2019 Wiley Periodicals, Inc.)

Published
2019
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2. Mutational spectrum in a worldwide study of 29,700 families with BRCA1 or BRCA2 mutations.

Author

Rebbeck TR, Friebel TM, Friedman E, Hamann U, Huo D, Kwong A, Olah E, Olopade OI, Solano AR, Teo SH, Thomassen M, Weitzel JN, Chan TL, Couch FJ, Goldgar DE, Kruse TA, Palmero EI, Park SK, Torres D, van Rensburg EJ, McGuffog L, Parsons MT, Leslie G, Aalfs CM, Abugattas J, Adlard J, Agata S, Aittomäki K, Andrews L, Andrulis IL, Arason A, Arnold N, Arun BK, Asseryanis E, Auerbach L, Azzollini J, Balmaña J, Barile M, Barkardottir RB, Barrowdale D, Benitez J, Berger A, Berger R, Blanco AM, Blazer KR, Blok MJ, Bonadona V, Bonanni B, Bradbury AR, Brewer C, Buecher B, Buys SS, Caldes T, Caliebe A, Caligo MA, Campbell I, Caputo SM, Chiquette J, Chung WK, Claes KBM, Collée JM, Cook J, Davidson R, de la Hoya M, De Leeneer K, de Pauw A, Delnatte C, Diez O, Ding YC, Ditsch N, Domchek SM, Dorfling CM, Velazquez C, Dworniczak B, Eason J, Easton DF, Eeles R, Ehrencrona H, Ejlertsen B, Engel C, Engert S, Evans DG, Faivre L, Feliubadaló L, Ferrer SF, Foretova L, Fowler J, Frost D, Galvão HCR, Ganz PA, Garber J, Gauthier-Villars M, Gehrig A, Gerdes AM, Gesta P, Giannini G, Giraud S, Glendon G, Godwin AK, Greene MH, Gronwald J, Gutierrez-Barrera A, Hahnen E, Hauke J, Henderson A, Hentschel J, Hogervorst FBL, Honisch E, Imyanitov EN, Isaacs C, Izatt L, Izquierdo A, Jakubowska A, James P, Janavicius R, Jensen UB, John EM, Vijai J, Kaczmarek K, Karlan BY, Kast K, Investigators K, Kim SW, Konstantopoulou I, Korach J, Laitman Y, Lasa A, Lasset C, Lázaro C, Lee A, Lee MH, Lester J, Lesueur F, Liljegren A, Lindor NM, Longy M, Loud JT, Lu KH, Lubinski J, Machackova E, Manoukian S, Mari V, Martínez-Bouzas C, Matrai Z, Mebirouk N, Meijers-Heijboer HEJ, Meindl A, Mensenkamp AR, Mickys U, Miller A, Montagna M, Moysich KB, Mulligan AM, Musinsky J, Neuhausen SL, Nevanlinna H, Ngeow J, Nguyen HP, Niederacher D, Nielsen HR, Nielsen FC, Nussbaum RL, Offit K, Öfverholm A, Ong KR, Osorio A, Papi L, Papp J, Pasini B, Pedersen IS, Peixoto A, Peruga N, Peterlongo P, Pohl E, Pradhan N, Prajzendanc K, Prieur F, Pujol P, Radice P, Ramus SJ, Rantala J, Rashid MU, Rhiem K, Robson M, Rodriguez GC, Rogers MT, Rudaitis V, Schmidt AY, Schmutzler RK, Senter L, Shah PD, Sharma P, Side LE, Simard J, Singer CF, Skytte AB, Slavin TP, Snape K, Sobol H, Southey M, Steele L, Steinemann D, Sukiennicki G, Sutter C, Szabo CI, Tan YY, Teixeira MR, Terry MB, Teulé A, Thomas A, Thull DL, Tischkowitz M, Tognazzo S, Toland AE, Topka S, Trainer AH, Tung N, van Asperen CJ, van der Hout AH, van der Kolk LE, van der Luijt RB, Van Heetvelde M, Varesco L, Varon-Mateeva R, Vega A, Villarreal-Garza C, von Wachenfeldt A, Walker L, Wang-Gohrke S, Wappenschmidt B, Weber BHF, Yannoukakos D, Yoon SY, Zanzottera C, Zidan J, Zorn KK, Hutten Selkirk CG, Hulick PJ, Chenevix-Trench G, Spurdle AB, Antoniou AC, and Nathanson KL

Subjects
Databases, Genetic, Family, Geography, Humans, BRCA1 Protein genetics, BRCA2 Protein genetics, Internationality, Mutation genetics
Abstract

The prevalence and spectrum of germline mutations in BRCA1 and BRCA2 have been reported in single populations, with the majority of reports focused on White in Europe and North America. The Consortium of Investigators of Modifiers of BRCA1/2 (CIMBA) has assembled data on 18,435 families with BRCA1 mutations and 11,351 families with BRCA2 mutations ascertained from 69 centers in 49 countries on six continents. This study comprehensively describes the characteristics of the 1,650 unique BRCA1 and 1,731 unique BRCA2 deleterious (disease-associated) mutations identified in the CIMBA database. We observed substantial variation in mutation type and frequency by geographical region and race/ethnicity. In addition to known founder mutations, mutations of relatively high frequency were identified in specific racial/ethnic or geographic groups that may reflect founder mutations and which could be used in targeted (panel) first pass genotyping for specific populations. Knowledge of the population-specific mutational spectrum in BRCA1 and BRCA2 could inform efficient strategies for genetic testing and may justify a more broad-based oncogenetic testing in some populations., (© 2018 Wiley Periodicals, Inc.)

Published
2018
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3. The BRCA2 c.68-7T > A variant is not pathogenic: A model for clinical calibration of spliceogenicity.

Author

Colombo M, Lòpez-Perolio I, Meeks HD, Caleca L, Parsons MT, Li H, De Vecchi G, Tudini E, Foglia C, Mondini P, Manoukian S, Behar R, Garcia EBG, Meindl A, Montagna M, Niederacher D, Schmidt AY, Varesco L, Wappenschmidt B, Bolla MK, Dennis J, Michailidou K, Wang Q, Aittomäki K, Andrulis IL, Anton-Culver H, Arndt V, Beckmann MW, Beeghly-Fadel A, Benitez J, Boeckx B, Bogdanova NV, Bojesen SE, Bonanni B, Brauch H, Brenner H, Burwinkel B, Chang-Claude J, Conroy DM, Couch FJ, Cox A, Cross SS, Czene K, Devilee P, Dörk T, Eriksson M, Fasching PA, Figueroa J, Fletcher O, Flyger H, Gabrielson M, García-Closas M, Giles GG, González-Neira A, Guénel P, Haiman CA, Hall P, Hamann U, Hartman M, Hauke J, Hollestelle A, Hopper JL, Jakubowska A, Jung A, Kosma VM, Lambrechts D, Le Marchand L, Lindblom A, Lubinski J, Mannermaa A, Margolin S, Miao H, Milne RL, Neuhausen SL, Nevanlinna H, Olson JE, Peterlongo P, Peto J, Pylkäs K, Sawyer EJ, Schmidt MK, Schmutzler RK, Schneeweiss A, Schoemaker MJ, See MH, Southey MC, Swerdlow A, Teo SH, Toland AE, Tomlinson I, Truong T, van Asperen CJ, van den Ouweland AMW, van der Kolk LE, Winqvist R, Yannoukakos D, Zheng W, Dunning AM, Easton DF, Henderson A, Hogervorst FBL, Izatt L, Offitt K, Side LE, van Rensburg EJ, Embrace S, Hebon S, McGuffog L, Antoniou AC, Chenevix-Trench G, Spurdle AB, Goldgar DE, Hoya M, and Radice P

Subjects
BRCA2 Protein metabolism, Base Sequence, Calibration, Cell Line, Exons genetics, Female, Genetic Predisposition to Disease, Humans, Mitomycin pharmacology, RNA, Messenger genetics, RNA, Messenger metabolism, BRCA2 Protein genetics, Genetic Variation, Models, Genetic, RNA Splicing genetics
Abstract

Although the spliceogenic nature of the BRCA2 c.68-7T > A variant has been demonstrated, its association with cancer risk remains controversial. In this study, we accurately quantified by real-time PCR and digital PCR (dPCR), the BRCA2 isoforms retaining or missing exon 3. In addition, the combined odds ratio for causality of the variant was estimated using genetic and clinical data, and its associated cancer risk was estimated by case-control analysis in 83,636 individuals. Co-occurrence in trans with pathogenic BRCA2 variants was assessed in 5,382 families. Exon 3 exclusion rate was 4.5-fold higher in variant carriers (13%) than controls (3%), indicating an exclusion rate for the c.68-7T > A allele of approximately 20%. The posterior probability of pathogenicity was 7.44 × 10 -115 . There was neither evidence for increased risk of breast cancer (OR 1.03; 95% CI 0.86-1.24) nor for a deleterious effect of the variant when co-occurring with pathogenic variants. Our data provide for the first time robust evidence of the nonpathogenicity of the BRCA2 c.68-7T > A. Genetic and quantitative transcript analyses together inform the threshold for the ratio between functional and altered BRCA2 isoforms compatible with normal cell function. These findings might be exploited to assess the relevance for cancer risk of other BRCA2 spliceogenic variants., (© 2018 The Authors. Human Mutation published by Wiley Periodicals, Inc.)

Published
2018
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4. Ovarian cancer susceptibility alleles and risk of ovarian cancer in BRCA1 and BRCA2 mutation carriers.

Author

Ramus SJ, Antoniou AC, Kuchenbaecker KB, Soucy P, Beesley J, Chen X, McGuffog L, Sinilnikova OM, Healey S, Barrowdale D, Lee A, Thomassen M, Gerdes AM, Kruse TA, Jensen UB, Skytte AB, Caligo MA, Liljegren A, Lindblom A, Olsson H, Kristoffersson U, Stenmark-Askmalm M, Melin B, Domchek SM, Nathanson KL, Rebbeck TR, Jakubowska A, Lubinski J, Jaworska K, Durda K, Złowocka E, Gronwald J, Huzarski T, Byrski T, Cybulski C, Toloczko-Grabarek A, Osorio A, Benitez J, Duran M, Tejada MI, Hamann U, Rookus M, van Leeuwen FE, Aalfs CM, Meijers-Heijboer HE, van Asperen CJ, van Roozendaal KE, Hoogerbrugge N, Collée JM, Kriege M, van der Luijt RB, Peock S, Frost D, Ellis SD, Platte R, Fineberg E, Evans DG, Lalloo F, Jacobs C, Eeles R, Adlard J, Davidson R, Eccles D, Cole T, Cook J, Paterson J, Douglas F, Brewer C, Hodgson S, Morrison PJ, Walker L, Porteous ME, Kennedy MJ, Pathak H, Godwin AK, Stoppa-Lyonnet D, Caux-Moncoutier V, de Pauw A, Gauthier-Villars M, Mazoyer S, Léoné M, Calender A, Lasset C, Bonadona V, Hardouin A, Berthet P, Bignon YJ, Uhrhammer N, Faivre L, Loustalot C, Buys S, Daly M, Miron A, Terry MB, Chung WK, John EM, Southey M, Goldgar D, Singer CF, Tea MK, Pfeiler G, Fink-Retter A, Hansen Tv, Ejlertsen B, Johannsson OT, Offit K, Kirchhoff T, Gaudet MM, Vijai J, Robson M, Piedmonte M, Phillips KA, Van Le L, Hoffman JS, Ewart Toland A, Montagna M, Tognazzo S, Imyanitov E, Issacs C, Janavicius R, Lazaro C, Blanco I, Tornero E, Navarro M, Moysich KB, Karlan BY, Gross J, Olah E, Vaszko T, Teo SH, Ganz PA, Beattie MS, Dorfling CM, van Rensburg EJ, Diez O, Kwong A, Schmutzler RK, Wappenschmidt B, Engel C, Meindl A, Ditsch N, Arnold N, Heidemann S, Niederacher D, Preisler-Adams S, Gadzicki D, Varon-Mateeva R, Deissler H, Gehrig A, Sutter C, Kast K, Fiebig B, Schäfer D, Caldes T, de la Hoya M, Nevanlinna H, Aittomäki K, Plante M, Spurdle AB, Neuhausen SL, Ding YC, Wang X, Lindor N, Fredericksen Z, Pankratz VS, Peterlongo P, Manoukian S, Peissel B, Zaffaroni D, Bonanni B, Bernard L, Dolcetti R, Papi L, Ottini L, Radice P, Greene MH, Mai PL, Andrulis IL, Glendon G, Ozcelik H, Pharoah PD, Gayther SA, Simard J, Easton DF, Couch FJ, and Chenevix-Trench G

Subjects
Adult, Cohort Studies, Female, Genetic Predisposition to Disease, Heterozygote, Humans, Middle Aged, Odds Ratio, Retrospective Studies, BRCA1 Protein genetics, BRCA2 Protein genetics, Mutation, Ovarian Neoplasms genetics, Polymorphism, Single Nucleotide
Abstract

Germline mutations in BRCA1 and BRCA2 are associated with increased risks of breast and ovarian cancer. A genome-wide association study (GWAS) identified six alleles associated with risk of ovarian cancer for women in the general population. We evaluated four of these loci as potential modifiers of ovarian cancer risk for BRCA1 and BRCA2 mutation carriers. Four single-nucleotide polymorphisms (SNPs), rs10088218 (at 8q24), rs2665390 (at 3q25), rs717852 (at 2q31), and rs9303542 (at 17q21), were genotyped in 12,599 BRCA1 and 7,132 BRCA2 carriers, including 2,678 ovarian cancer cases. Associations were evaluated within a retrospective cohort approach. All four loci were associated with ovarian cancer risk in BRCA2 carriers; rs10088218 per-allele hazard ratio (HR) = 0.81 (95% CI: 0.67-0.98) P-trend = 0.033, rs2665390 HR = 1.48 (95% CI: 1.21-1.83) P-trend = 1.8 × 10(-4), rs717852 HR = 1.25 (95% CI: 1.10-1.42) P-trend = 6.6 × 10(-4), rs9303542 HR = 1.16 (95% CI: 1.02-1.33) P-trend = 0.026. Two loci were associated with ovarian cancer risk in BRCA1 carriers; rs10088218 per-allele HR = 0.89 (95% CI: 0.81-0.99) P-trend = 0.029, rs2665390 HR = 1.25 (95% CI: 1.10-1.42) P-trend = 6.1 × 10(-4). The HR estimates for the remaining loci were consistent with odds ratio estimates for the general population. The identification of multiple loci modifying ovarian cancer risk may be useful for counseling women with BRCA1 and BRCA2 mutations regarding their risk of ovarian cancer., (© 2012 Wiley Periodicals, Inc.)

Published
2012
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5. Detection of p53 gene mutations in oral squamous cell carcinomas of a black African population sample.

Author

van Rensburg EJ, Engelbrecht S, van Heerden WF, Kotze MJ, and Raubenheimer EJ

Subjects
Adult, Aged, Amino Acid Substitution genetics, Base Sequence, Carcinoma, Squamous Cell epidemiology, Female, Humans, Incidence, Male, Middle Aged, Molecular Sequence Data, Mouth Neoplasms epidemiology, South Africa epidemiology, Black People genetics, Carcinoma, Squamous Cell genetics, Genes, p53, Mouth Neoplasms genetics, Mutation
Abstract

Mutations in the p53 gene have been reported in head and neck carcinomas. We determined the p53 mutation profile in 55 oral squamous cell carcinomas (OSCCs) from a black African population sample. DNA from all the patients were investigated using PCR amplification of the p53 gene (exons 5-9), followed by heteroduplex single-stranded conformational polymorphism (HEX-SSCP) analysis on the PCR products. Direct sequencing was performed on cases where mutations were identified. The results showed mutations in 13 of 55 (23.6%) tumours. Eleven of 13 (85%) were single base pair substitutions (9 transitions and 2 transversions), and 2 were deletions. Two novel mutations were identified: a large 63-base pair deletion, and a single base pair substitution. The mutations in our study occurred outside the head and neck tumour hot spot region (codons 238-248).

Published
1998
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