Crossover interference and sex-specific genetic maps shape identical by descent sharing in close relatives
Autoři:
Madison Caballero aff001; Daniel N. Seidman aff002; Ying Qiao aff002; Jens Sannerud aff002; Thomas D. Dyer aff003; Donna M. Lehman aff004; Joanne E. Curran aff003; Ravindranath Duggirala aff003; John Blangero aff003; Shai Carmi aff005; Amy L. Williams aff002
Působiště autorů:
Department of Molecular Biology and Genetics, Cornell University, Ithaca, New York, United States of America
aff001; Department of Computational Biology, Cornell University, Ithaca, New York, United States of America
aff002; South Texas Diabetes and Obesity Institute and Department of Human Genetics, University of Texas Rio Grande Valley School of Medicine, Brownsville, Texas, United States of America
aff003; Department of Medicine, University of Texas Health Science Center at San Antonio, San Antonio, Texas, United States of America
aff004; Braun School of Public Health and Community Medicine, The Hebrew University of Jerusalem, Jerusalem, Israel
aff005
Vyšlo v časopise:
Crossover interference and sex-specific genetic maps shape identical by descent sharing in close relatives. PLoS Genet 15(12): e32767. doi:10.1371/journal.pgen.1007979
Kategorie:
Research Article
doi:
https://doi.org/10.1371/journal.pgen.1007979
Souhrn
Simulations of close relatives and identical by descent (IBD) segments are common in genetic studies, yet most past efforts have utilized sex averaged genetic maps and ignored crossover interference, thus omitting features known to affect the breakpoints of IBD segments. We developed Ped-sim, a method for simulating relatives that can utilize either sex-specific or sex averaged genetic maps and also either a model of crossover interference or the traditional Poisson model for inter-crossover distances. To characterize the impact of previously ignored mechanisms, we simulated data for all four combinations of these factors. We found that modeling crossover interference decreases the standard deviation of pairwise IBD proportions by 10.4% on average in full siblings through second cousins. By contrast, sex-specific maps increase this standard deviation by 4.2% on average, and also impact the number of segments relatives share. Most notably, using sex-specific maps, the number of segments half-siblings share is bimodal; and when combined with interference modeling, the probability that sixth cousins have non-zero IBD sharing ranges from 9.0 to 13.1%, depending on the sexes of the individuals through which they are related. We present new analytical results for the distributions of IBD segments under these models and show they match results from simulations. Finally, we compared IBD sharing rates between simulated and real relatives and find that the combination of sex-specific maps and interference modeling most accurately captures IBD rates in real data. Ped-sim is open source and available from https://github.com/williamslab/ped-sim.
Klíčová slova:
Gene mapping – Genetic interference – Haplotypes – Meiosis – Physical mapping – Probability density – Simulation and modeling – Crossover interference
Zdroje
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