期刊
MOLECULAR BIOLOGY AND EVOLUTION
卷 36, 期 1, 页码 28-38出版社
OXFORD UNIV PRESS
DOI: 10.1093/molbev/msy181
关键词
sex chromosome; introgression; stickleback; degeneration; sex-biased expression
资金
- National Institutes of Health [R01 GM116853]
- Japan Society for the Promotion of Science [17KT0028]
- Grants-in-Aid for Scientific Research [17KT0028] Funding Source: KAKEN
Introgression is increasingly recognized as a source of genetic diversity that fuels adaptation. Its role in the evolution of sex chromosomes, however, is not well known. Here, we confirm the hypothesis that the Y chromosome in the ninespine stickleback, Pungitius pungitius, was established by introgression from the Amur stickleback, P. sinensis. Using whole genome resequencing, we identified a large region of Chr 12 in P. pungitius that is diverged between males and females. Within but not outside of this region, several lines of evidence show that the Y chromosome of P. pungitius shares a most recent common ancestor not with the X chromosome, but with the homologous chromosome in P. sinensis. Accumulation of repetitive elements and gene expression changes on the new Y are consistent with a young sex chromosome in early stages of degeneration, but other hallmarks of Y chromosomes have not yet appeared. Our findings indicate that porous species boundaries can trigger rapid sex chromosome evolution.
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