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Mueller, Jacob L.; Skaletsky, Helen; Brown, Laura G.; Zaghlul, Sara; Rock, Susan; Graves, Tina; Auger, Katherine; Warren, Wesley C.; Wilson, Richard K.; Page, David C.
Nature genetics, 07/2013, Letnik: 45, Številka: 9Journal Article
We compared the human and mouse X chromosomes to systematically test Ohno’s law, which states that the gene content of X chromosomes is conserved across placental mammals 1 . First, we improved the accuracy of the human X-chromosome reference sequence through single-haplotype sequencing of ampliconic regions. This closed gaps in the reference sequence, corrected previously misassembled regions, and identified new palindromic amplicons. Our subsequent analysis led us to conclude that the evolution of human and mouse X chromosomes was bimodal. In accord with Ohno’s law, 94–95% of X-linked single-copy genes are shared between human and mouse; most are expressed in both sexes. Strikingly, most X-ampliconic genes are exceptions to Ohno’s law: only 31% of human and 22% of mouse X-ampliconic genes share orthologs. X-ampliconic genes are expressed predominantly in testicular germ cells, and many were independently acquired since the common ancestor of humans and mice, specializing portions of their X chromosomes for sperm production.
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