Contrasting levels of nucleotide diversity on the avian Z and W sex chromosomes

Molecular Biology and Evolution
H MontellHans Ellegren

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 (d) 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 ra...Continue Reading

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Citations

Dec 2, 2005·Journal of Molecular Evolution·Sofia Berlin, Hans Ellegren
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