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基因复制,转位和Dmrt1的分子进化和相关的性别决定基因在Anurans
Sagar S Shinde1, Paris Veltsos1, Wen-Juan Ma1
1Research Group of Ecology, Evolution and Genetics, Biology Department, Vrije Universiteit Brussel, 1050 Brussels, Belgium.
Biomolecules
|September 27, 2025
概括
青中的主性决定基因很少来自基因重复. 相反,它们通过等位基因多样化和新型突变进化,在没有基因转位的情况下驱动性染色体周转.
科学领域:
- 进化生物学 进化生物学
- 遗传学 遗传学 是一个
- 发展生物学 发展生物学
背景情况:
- 性决定是由主性决定基因控制的,但它们的起源和进化不太清楚.
- 类动物 (青和) 具有同型的性别染色体,转换速度很快,与哺乳动物,鸟类和类动物不同.
- 主性性别决定基因可以通过基因重复或等位基因多样化进化;性别染色体周转涉及基因转移或突变.
研究的目的:
- 调查主性决定基因的出现和性染色体周转机制在anurans.
- 为了确定基因重复在主性决定基因的频率.
- 评估基因转位在性染色体循环中的作用以及这些基因的进化选择压力.
主要方法:
- 分析了53个已发表的类基因组和1个类基因组.
- 对可用的转录组进行基因表达模式的检查.
- 对比基因组分析以评估染色体水平的合成和基因转位.
主要成果:
- 染色体水平的合成在anuran中高度保留,没有证据表明候选基因 (Dmrt1,Foxl2,Bod1l,Sox3) 的转位.
- 在50个物种中,只有3个物种出现了Dmrt1的基因重复;Dmrt1在净化选择下进化,而其重复物则显示出积极选择的迹象.
- 基多样化似乎是主性性别决定基因进化的主要模式,而不是基因重复.
结论:
- 在阿努拉人中,主性决定基因很少从基因重复中产生的;等位基因多样化是更常见的进化路线.
- 性染色体周转不是由基因转位驱动的,而是可能是由参与性发育途径的基因突变驱动的.
- 未来的研究应侧重于基多样化和在性决定和性染色体进化中的新突变.
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