在深度分歧的胡须 (Leptobrachium) 之间,古代和最近的跨物种侵入的对比和基因组特征
Jun Li1, Qingbo Ai1, Siyu Xie1
1Hubei Key Laboratory of Genetic Regulation and Integrative Biology, School of Life Sciences, Central China Normal University, Wuhan, Hubei, People's Republic of China.
Molecular ecology
|October 28, 2024
概括
胡须的古代杂交引入了适应性基因,而最近的杂交是中性的. 这些发现揭示了内进如何影响物种进化和适应在深层进化分歧.
科学领域:
- 基因组学就是基因组学.
- 进化生物学 进化生物学
- 两动物研究研究
背景情况:
- 在物种进化过程中,物种间的内侵是至关重要的,但研究往往忽略了在深度分歧的物种中古代的杂交.
- 胡须 (Leptobrachium) 提供了一个模型来研究古代和最近的杂交事件的基因组结果.
研究的目的:
- 分析胡须青的全基因组数据,以确定跨极其不同的物种跨物种杂交的信号和后果.
- 探索古老的适应性和最近的中性内侵事件的基因组特征和进化意义.
主要方法:
- 九种胡须青物种的全基因组测序.
- 识别和分析跨物种的内进信号,以生代的分歧.
- 检查进化基因功能和选择模式的检查.
主要成果:
- 检测到三个杂交事件,包括从L. leishanense到L. liui祖先的古代内进,在免疫和气味基因中引入适应变异.
- 确定了最近从L. huashen到L. tengchongense的内进,其中大部分是中立的内进区域.
- 发现了交配前的隔离和遗传不相容性的证据,限制了不同物种之间的内侵.
结论:
- 古代的内进化可以引入适应变异,而最近的内进化在深度分离的两动物中通常是中性的.
- 诸如交配前的隔离和遗传不相容等机制,尽管发生杂交,但仍然保持了物种界限.
- 深度分离的物种之间的杂交可能是常见的,但显著的内侵是罕见的,古代事件可能会推动适应.
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