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a sex-ratio meiotic drive system in drosophila simulans. ii an x-linked distorter性别比例在果蝇simulans减数分裂驱动系统。
PLoS BIOLOGY
A sex-ratio Meiotic Drive System in Drosophila
simulans. II: An X-linked Distorter
1,2* 1 1 1 2 1
Yun Tao , Luciana Araripe , Sarah B. Kingan , Yeyan Ke , Hailian Xiao , Daniel L. Hartl
1 Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts, United States of America, 2 Department of Biology, Emory University,
Atlanta, Georgia, United States of America
The evolution of heteromorphic sex chromosomes creates a genetic condition favoring the invasion of sex-ratio meiotic
drive elements, resulting in the biased transmission of one sex chromosome over the other, in violation of Mendel’s
first law. The molecular mechanisms of sex-ratio meiotic drive may therefore help us to understand the evolutionary
forces shaping the meiotic behavior of the sex chromosomes. Here we characterize a sex-ratio distorter on the X
chromosome (Dox) in Drosophila simulans by genetic and molecular means. Intriguingly, Dox has very limited coding
capacity. It evolved from another X-linked gene, which also evolved de nova. Through retrotransposition, Dox also
gave rise to an autosomal suppressor, not much yang (Nmy). An RNA interference mechanism seems to be involved in
the suppression of the Dox distorter by the Nmy suppressor. Double mutant males of the genotype dox; nmy are
normal for both sex-ratio and spermatogenesis. We postulate that recurrent bouts of sex-ratio meiotic drive and its
subsequent suppression might underlie several common features observed in the heterogametic sex, including meiotic
sex chromosome inactivation and achiasmy.
Citation: Tao Y, Araripe L, Kingan SB, Ke Y, Xiao H, et al. (2007) A sex-ratio me
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