基因复制动态和监管进化塑造了Asteraceae的多样化
Erika R Moore-Pollard1,2, Paige A Ellestad1, Brannan R Cliver3,4
1Department of Biological Sciences, University of Memphis, Memphis, Tennessee, USA.
bioRxiv : the preprint server for biology
|November 24, 2025
概括
基因组分析显示,小规模的基因重复和调节网络的微调,而不仅仅是古代的多重体育,推动了Asteraceae家族的非凡多样化.
科学领域:
- 基因组学就是基因组学.
- 进化生物学 进化生物学
- 植物科学 植物科学
背景情况:
- 星类 (Asterales) 序列在星类 (Asteraceae) 家族 (>30,000个物种) 和它的姐妹家族 (Calyceraceae) (<50个物种) 之间,在物种丰富度上显示出显著的差异.
- 了解这种多样化不平衡的基因组基础对于进化研究至关重要.
研究的目的:
- 调查Asterales顺序内的极端物种丰富差异的基因组基础.
- 为了比较Asteraceae和Calyceraceae的基因组,以确定有助于多样化的因素.
主要方法:
- 三个新的染色体级基因组组合,包括第一个用于Calyceraceae.
- 重新注释了五个现有的基因组.
- 比较基因组分析侧重于重复内容,染色体重排和全基因组重复 (WGD).
主要成果:
- 科和科都表现出高重复含量和频繁的染色体重排.
- 发现了共享和谱系特定全基因组重复 (WGDs) 的证据.
- 在Asteraceae中,小规模重复 (并列和分散) 扩大了与二次代谢和应激反应相关的基因家族.
- 在Asteraceae中的细分重复体显示了调节生物合成和代谢过程的适应性选择.
- 花开时间调节器的选择性压力表明,花进化中的灵活性和约束之间存在平衡.
结论:
- 除了古老的多重性外,小规模的基因重复和调节网络的微调是Asteraceae生态多功能性和多样化的关键驱动因素.
- 比较基因组学提供了对开花植物极端物种丰富的演变的见解.
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