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• W2116755191 endingPage "2016" @default.
• W2116755191 startingPage "2010" @default.
• W2116755191 abstract "Sex chromosomes may provide a context for studying the local effects of mutation rate on molecular evolution, since the two types of sex chromosomes are generally exposed to different mutational environments in male and female germ lines. Importantly, recent studies of some vertebrates have provided evidence for a higher mutation rate among males than among females. Thus, in birds, the Z chromosome, which spends two thirds of its time in the male germ line, is exposed to more mutations than the female-specific W chromosome. We show here that levels of nucleotide diversity are drastically higher on the avian Z chromosome than in paralogous sequences on the W chromosome. In fact, no intraspecific polymorphism whatsoever was seen in about 3.4 kb of CHD1W intron sequence from a total of >150 W chromosome copies of seven different bird species. In contrast, the amount of genetic variability in paralogous sequences on the Z chromosome was significant, with an average pairwise nucleotide diversity (ð) of 0.0020 between CHD1Z introns and with 37 segregating sites in a total of 3.8 kb of Z sequence. The contrasting levels of genetic variability on the avian sex chromosomes are thus in a direction predicted from a male-biased mutation rate. However, although a low gene number, as well as some other factors, argues against background selection and/or selective sweeps shaping the genetic variability of the avian W chromosome, we cannot completely exclude selection as a contributor to the low levels of variation on the W chromosome." @default.
• W2116755191 created "2016-06-24" @default.
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• W2116755191 date "2001-11-01" @default.
• W2116755191 modified "2023-09-27" @default.
• W2116755191 title "Contrasting Levels of Nucleotide Diversity on the Avian Z and W Sex Chromosomes" @default.
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• W2116755191 doi "https://doi.org/10.1093/oxfordjournals.molbev.a003742" @default.
• W2116755191 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/11606697" @default.
• W2116755191 hasPublicationYear "2001" @default.
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