Haplotype structure in Ashkenazi Jewish BRCA1 and BRCA2 mutation carriers.

Authors:
Dr. Michael Dean, PhD
Dr. Michael Dean, PhD
National Cancer Institute
Sr. Scientist, LTG, DCEG
Human Genetics
Gaithersburg, MD | United States
Kate M Im Tomas Kirchhoff Xianshu Wang Todd Green Clement Y Chow Joseph Vijai Joshua Korn Mia M Gaudet Zachary Fredericksen V Shane Pankratz Candace Guiducci Andrew Crenshaw Lesley McGuffog Christiana Kartsonaki Jonathan Morrison Sue Healey Olga M Sinilnikova Phuong L Mai Mark H Greene Marion Piedmonte Wendy S Rubinstein Frans B Hogervorst Matti A Rookus J Margriet Collée Nicoline Hoogerbrugge Christi J van Asperen Hanne E J Meijers-Heijboer Cees E Van Roozendaal Trinidad Caldes Pedro Perez-Segura Anna Jakubowska Jan Lubinski Tomasz Huzarski Paweł Blecharz Heli Nevanlinna Kristiina Aittomäki Conxi Lazaro Ignacio Blanco Rosa B Barkardottir Marco Montagna Emma D'Andrea Peter Devilee Olufunmilayo I Olopade Susan L Neuhausen Bernard Peissel Bernardo Bonanni Paolo Peterlongo Christian F Singer Gad Rennert Flavio Lejbkowicz Irene L Andrulis Gord Glendon Hilmi Ozcelik Amanda Ewart Toland Maria Adelaide Caligo Mary S Beattie Salina Chan Susan M Domchek Katherine L Nathanson Timothy R Rebbeck Catherine Phelan Steven Narod Esther M John John L Hopper Saundra S Buys Mary B Daly Melissa C Southey Mary-Beth Terry Nadine Tung Thomas V O Hansen Ana Osorio Javier Benitez Mercedes Durán Jeffrey N Weitzel Judy Garber Ute Hamann Susan Peock Margaret Cook Clare T Oliver Debra Frost Radka Platte D Gareth Evans Ros Eeles Louise Izatt Joan Paterson Carole Brewer Shirley Hodgson Patrick J Morrison Mary Porteous Lisa Walker Mark T Rogers Lucy E Side Andrew K Godwin Rita K Schmutzler Barbara Wappenschmidt Yael Laitman Alfons Meindl Helmut Deissler Raymonda Varon-Mateeva Sabine Preisler-Adams Karin Kast Laurence Venat-Bouvet Dominique Stoppa-Lyonnet Georgia Chenevix-Trench Douglas F Easton Robert J Klein Mark J Daly Eitan Friedman Andrew G Clark David M Altshuler Antonis C Antoniou Fergus J Couch Kenneth Offit Bert Gold

Hum Genet 2011 Nov 20;130(5):685-99. Epub 2011 May 20.

Center for Cancer Research, Cancer Inflammation Program, Human Genetics Section, National Cancer Institute, Frederick, MD, USA.

Three founder mutations in BRCA1 and BRCA2 contribute to the risk of hereditary breast and ovarian cancer in Ashkenazi Jews (AJ). They are observed at increased frequency in the AJ compared to other BRCA mutations in Caucasian non-Jews (CNJ). Several authors have proposed that elevated allele frequencies in the surrounding genomic regions reflect adaptive or balancing selection. Such proposals predict long-range linkage disequilibrium (LD) resulting from a selective sweep, although genetic drift in a founder population may also act to create long-distance LD. To date, few studies have used the tools of statistical genomics to examine the likelihood of long-range LD at a deleterious locus in a population that faced a genetic bottleneck. We studied the genotypes of hundreds of women from a large international consortium of BRCA1 and BRCA2 mutation carriers and found that AJ women exhibited long-range haplotypes compared to CNJ women. More than 50% of the AJ chromosomes with the BRCA1 185delAG mutation share an identical 2.1 Mb haplotype and nearly 16% of AJ chromosomes carrying the BRCA2 6174delT mutation share a 1.4 Mb haplotype. Simulations based on the best inference of Ashkenazi population demography indicate that long-range haplotypes are expected in the context of a genome-wide survey. Our results are consistent with the hypothesis that a local bottleneck effect from population size constriction events could by chance have resulted in the large haplotype blocks observed at high frequency in the BRCA1 and BRCA2 regions of Ashkenazi Jews.

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http://dx.doi.org/10.1007/s00439-011-1003-zDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3196382PMC
November 2011
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