在一个基因组区域中,在性和无性血统之间对比进化模式,与豆的繁殖模式变化有关
Maud Rimbault1, Fabrice Legeai1,2, Jean Peccoud3
1INRAE, UMR 1349, Institute of Genetics, Environment and Plant Protection, Le Rheu, France.
Genome biology and evolution
|September 17, 2023
概括
科学家们在豆 (Acyrthosiphon pisum) 中发现了一个特定的X链接区域,与性繁殖的丧失有关. 这一遗传区域显示了周期性生与义务性生谱系之间的显著分歧,揭示了无性进化.
科学领域:
- 进化生物学 进化生物学
- 遗传学 是一个遗传学.
- 生殖生物学 生殖生物学
背景情况:
- 无性血统经常从各种类型的性祖先演变为不同的类型.
- 性损失的遗传基础在很大程度上仍然没有被描述.
- 豆虫 (Acyrthosiphon pisum) 提供了一个模型系统,其中包括循环生 (CP) 和义务生 (OP) 血统.
研究的目的:
- 为了研究 pea aphids 生殖模式变化的遗传基础.
- 确定与从性繁殖过渡到无性繁殖相关的基因组区域.
主要方法:
- 使用单核酸多态 (SNP) 数据进行全基因组扫描.
- 来自多个代表CP和OP血统的种群的聚合DNA的测序.
- 对遗传差异化 (FST) 和多样性指标 (Tajima的D) 的分析.
主要成果:
- X染色体上的840kb区域与生殖模式变异密切相关.
- 这个X链接区域在CP和OP种群之间呈现出很高的分歧 (FST=34.9%).
- 在OP种群中,该地区的遗传多样性和Tajima的D减少,这表明它是一种衍生性质.
结论:
- 鉴定到的X结合区域是 pea aphids 中强制性伴生代进化的关键因素.
- 较低的全基因组差异化表明CP和OP谱系之间持续的基因流动.
- 气候驱动的选择和基因交换可能维持了这两种生殖策略.
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