胚胎氧气水平的变化促使肢体启动中的异时代性
bioRxiv : the preprint server for biology
|November 1, 2024
概括
哺乳动物发育时间 (异时) 的进化变化与后肢增长的延迟有关. 这种转变是意外地由氧气水平和转录因子调节的,而不是基因序列.
科学领域:
- 发育生物学 发展生物学
- 进化生物学 进化生物学
- 遗传学 是一个遗传学.
背景情况:
- 不同时代性,发育时间的改变,驱动着进化变化.
- 鸟类胚胎显示肢体同步生长,而哺乳动物显示后肢发育延迟.
研究的目的:
- 为了研究哺乳动物肢体异时的机械基础.
- 了解基因表达和环境因素在发育时间表中的作用.
主要方法:
- 对鸟类和哺乳动物胚胎肢体发育的比较分析.
- 对T盒转录因子表达模式的检查.
- 研究氧气水平和NFKB信号传递 (cRel) 对肢体发育的影响.
主要成果:
- 哺乳动物的四肢异常性始于四肢芽的形成,与T-box转录因子相关.
- 不同时代的转变是独立于cis-regulatory序列的变化.
- 不同的氧气暴露和cRel调解了这种发育时间差异.
结论:
- 母亲的环境,特别是氧气水平,显著影响胚胎发育时间.
- 这项研究为异时制的一个关键例子提供了机械解释.
- 突出了进化过程中环境因素和基因调节之间的相互作用.
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