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一个新性别染色体在鱼物种化中的作用
Jun Kitano1, Joseph A Ross, Seiichi Mori
1Division of Human Biology, Fred Hutchinson Cancer Research Center, 1100 Fairview Avenue North, Seattle, Washington 98109, USA.
Nature
|September 29, 2009
概括
性冲突推动了物种化. 鱼中的一个新的性别染色体携带了用于生殖隔离的基因,证明了性别染色体周转率.
科学领域:
- 进化生物学是进化的生物学.
- 遗传学 是一个遗传学.
- 规格研究研究 规格研究
背景情况:
- 理论上说,性对抗会影响性染色体的进化和物种化.
- 性染色体循环在产生物种之间的繁殖隔离中的作用仍然不清楚.
- 密切相关的物种经常表现出不同的性别染色体系统.
研究的目的:
- 调查性染色体循环是否有助于生殖隔离的演变.
- 在新进化的性染色体上识别影响物种化的基因.
- 在鱼类模型系统中检查性染色体在生殖隔离中的作用.
主要方法:
- 在一对对应物种的三脊鱼 (Gasterosteus aculeatus) 中识别了新性染色体系统.
- 对男性特异性特征的遗传链接映射对于生殖隔离至关重要.
- 对新X染色体和祖先X染色体的基因位置的分析.
主要成果:
- 一种新性别染色体系统被确定在一个日本交配对的一种物种中.
- 新X染色体含有影响男性求爱表现的基因,有助于行为孤立.
- 祖先的X染色体含有行为隔离和混合男性不育的位置.
- 在这个脊椎动物系统中观察到对生殖隔离的显著"X效应".
结论:
- 一个年轻的新X染色体直接促进了密切相关物种之间的繁殖隔离.
- 性染色体循环可能在物种化中发挥着比以前理解的更为重要的作用.
- 这项研究提供了强有力的证据,证明了性别染色体对脊椎动物物种化的影响.
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