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The landscape of recombination in African Americans

2011; Nature Portfolio; Volume: 476; Issue: 7359 Linguagem: Inglês

10.1038/nature10336

1476-4687

Anjali Gupta Hinch, Arti Tandon, Nick Patterson, Yunli Song, Nadin Rohland, Colin N. A. Palmer, Gary K. Chen, Kai Wang, Sarah G. Buxbaum, Ermeg L. Akylbekova, Melinda C. Aldrich, Christine B. Ambrosone, Christopher I. Amos, Elisa V. Bandera, Sonja I. Berndt, Leslie Bernstein, William J. Blot, Cathryn H. Bock, Eric Boerwinkle, Qiuyin Cai, Neil E. Caporaso, Graham Casey, L. Adrienne Cupples, Sandra L. Deming, W. Ryan Diver, Jasmin Divers, Myriam Fornage, Elizabeth M. Gillanders, Joseph Glessner, Curtis C. Harris, Jennifer J. Hu, Sue A. Ingles, William B. Isaacs, Esther M. John, W.H. Linda Kao, Brendan J. Keating, Rick A. Kittles, Laurence N. Kolonel, Emma K. Larkin, Loı̈c Le Marchand, Lorna H. McNeill, Robert C. Millikan, M. John Murphy, Solomon K. Musani, Christine Neslund‐Dudas, Sarah J. Nyante, George Papanicolaou, Michael F. Press, Bruce M. Psaty, Alex P. Reiner, Stephen S. Rich, Jorge L. Rodriguez‐Gil, Jerome I. Rotter, Benjamin A. Rybicki, Ann G. Schwartz, Lisa B. Signorello, Margaret R. Spitz, Sara S. Strom, Michael J. Thun, Margaret A. Tucker, Thomas J. Wang, John K. Wiencke, John S. Witte, Margaret Wrensch, Xifeng Wu, Yuko Yamamura, Krista A. Zanetti, Wei Zheng, Regina G. Ziegler, Xiaofeng Zhu, Susan Redline, Joel N. Hirschhorn, Brian E. Henderson, Herman A. Taylor, Alkes L. Price, Hákon Hákonarson, Stephen J. Chanock, Christopher A. Haiman, James G. Wilson, David Reich, Simon Myers,

Chromosomal and Genetic Variations

Recombination, together with mutation, gives rise to genetic variation in populations. Here we leverage the recent mixture of people of African and European ancestry in the Americas to build a genetic map measuring the probability of crossing over at each position in the genome, based on about 2.1 million crossovers in 30,000 unrelated African Americans. At intervals of more than three megabases it is nearly identical to a map built in Europeans. At finer scales it differs significantly, and we identify about 2,500 recombination hotspots that are active in people of West African ancestry but nearly inactive in Europeans. The probability of a crossover at these hotspots is almost fully controlled by the alleles an individual carries at PRDM9 (P value < 10−245). We identify a 17-base-pair DNA sequence motif that is enriched in these hotspots, and is an excellent match to the predicted binding target of PRDM9 alleles common in West Africans and rare in Europeans. Sites of this motif are predicted to be risk loci for disease-causing genomic rearrangements in individuals carrying these alleles. More generally, this map provides a resource for research in human genetic variation and evolution. Genetic maps measure the probability of crossovers at each position in a genome and are valuable tools for the study of variation in populations. A genetic map has now been constructed using data from 18,000 African American individuals. Comparison with European genetic maps reveals more than 2,000 recombination hot spots that are active in people of West African ancestry but inactive in most Europeans. The probability of crossover at these hot spots is controlled at the PRDM9 locus. A 17-base-pair DNA sequence motif is enriched at these hot spots, a source of risk for disease-causing genomic rearrangements.