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- W620832811 abstract "Understanding the genetic basis of reproductive isolation is a fundamental question in evolution. In house mice, intrinsic postzygotic isolation via hybrid male sterility is emerging as a reoccurring pattern. Previous work has suggested that hybrid male sterility may be due to a disruption in meiotic sex chromosome inactivation (MSCI). MSCI is the process by which the sex chromosomes are transcriptionally silenced during the meiotic phase of spermatogenesis. It has been demonstrated that MSCI is necessary for successful spermatogenesis. Therefore, a disruption in the MSCI pathway may cause mismanagement of the sex chromosomes during spermatogenesis and thus may cause sterility. BRCA1, the tumor suppressor gene, has a vital role in the MSCI pathway and functions in a host of other cellular processes such as DNA double-stranded break (DSB) repair and X chromosome inactivation. We are taking a candidate gene approach in order to identify genes that may contribute to hybrid male sterility by evaluating patterns of molecular evolution in Mus musculus domesticus and Mus musculus musculus at genes implicated in MSCI. BRCA1 is a strong candidate for involvement in hybrid male sterility for this system because it is essential to the MSCI pathway and is highly divergent between M. m. musculus and M. m. domesticus. We sequenced exon 10 of BRCA1 in samples from wild populations of M. m. musculus (n = 20) and M. m. domesticus (n = 21). The sequence data were then analyzed with a variety of neutrality tests in order to detect positive selection. Positive selection acting on Brca1 in either lineage may lead to functional changes in the protein that are not compatible with the MSCI machinery in a hybrid background. Our results indicate that exon 10 of Brca1 is undergoing weak purifying selection in M. m. domesticus rather than positive selection. Therefore, there is no evidence in these data to suggest that exon 10 of the" @default.
- W620832811 created "2016-06-24" @default.
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- W620832811 date "2011-05-01" @default.
- W620832811 modified "2023-09-24" @default.
- W620832811 title "BRCA1: A Candidate Gene for Reproductive Isolation in House Mice" @default.
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