鱼基因组阐明脊椎动物全基因组重复事件及其进化后果
Daqi Yu1,2, Yandong Ren3,4, Masahiro Uesaka5,6
1Key Laboratory of Zoological Systematics and Evolution and State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing, China.
Nature ecology & evolution
|January 12, 2024
概括
全基因组复制 (WGD) 事件塑造了脊椎动物早期的进化. 我们对鱼基因组的研究表明,第二个WGD发生在脊椎动物分歧后,挑战了WGD和体平面复杂性之间的联系.
科学领域:
- 基因组学就是基因组学.
- 进化生物学 进化生物学
- 进行比较基因组学.
背景情况:
- 全基因组重复 (WGD) 是一个重要的进化机制,影响基因组架构和生物创新.
- 2R假设在脊椎动物早期进化中假设了两个WGD事件,但它们相对于循环体-体分歧的精确时机尚不清楚.
- 在推动脊椎动物表型多样化的过程中,WGDs的作用仍在争论中.
研究的目的:
- 通过沿海鱼基因组重建早期的循环组基因组演变.
- 为了解决第二个WGD (2R) 事件的时间,与脊椎动物谱系分歧有关.
- 研究WGDs对脊椎动物发育进化和形态多样化的影响.
主要方法:
- 沿海鱼 (Eptatretus burgeri) 的基因组测序.
- 基因组比较分析,使用鱼和鱼基因组.
- 全基因组的合成和遗传学分析.
- 功能性基因组和形态空间分析.
主要成果:
- 第一个WGD (1R) 发生在早期的脊椎动物干系中.
- 第二个WGD (2R) 发生在从循环体分离后的gnathostome干系中.
- 干细胞细胞组经历了独立的基因组三倍化.
- WGDs通过类似的调节基因组变化,在循环体和阴体中都对发育进化作出贡献.
- 尽管WGDs,但在gnathostomes中发生了显著的形态多样化,但在cyclostomes中没有.
结论:
- 解决了2R WGD的时间,发生在gnathostomes和cyclostomes之间分裂后.
- WGDs与发育进化有关,但并不普遍驱动主要的身体平面复杂性飞跃,特别是在循环组系中.
- 该研究质疑WGD与所有脊椎动物系中广泛的形态多样化之间的直接因果关系.
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