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强大的瓶限制了宿主-寄生虫转基因群中的适应性共同进化

Pascal Angst^1,2, Christoph R Haag^2,3, Frida Ben-Ami^2,4

¹Department of Environmental Sciences, Zoology, University of Basel, Basel, Switzerland.

Molecular ecology

|July 21, 2025

概括

宿主种群结构显著影响寄生虫的进化. 这项研究表明,宿主动态可以加速微型虫寄生虫Hamiltosporidium tvaerminnensis的遗传漂移,导致寄生虫进化速度比以前假设的要慢.

科学领域:

进化生物学进化生物学
寄生虫学的寄生虫学
人口遗传学人口遗传学

背景情况:

寄生虫通过适应性进化来利用宿主.
传播瓶和宿主群体结构可以诱导寄生虫的遗传漂移,限制它们的适应性进化.
宿主种群动态和寄生虫进化之间的相互作用仍然不完全理解.

研究的目的:

研究宿主群体结构对微型虫寄生虫Hamiltosporidium tvaerminnensis的基因组演变的影响.
分析H. tvaerminnensis与其宿主Daphnia magna之间的共同进化动态.
为了确定宿主种群结构是否加速寄生虫种群中的遗传漂移.

主要方法:

在10年内,对59个宿主 (Daphnia magna) 和寄生虫 (Hamiltosporidium tvaerminnensis) 亚群进行了纵向全基因组等位基因频率跟踪.
分析宿主和寄生虫之间的共分散和隔离距离模式.
在寄生虫群体中识别遗传特征,包括同胞性 (ROHs) 的运行.

主要成果:

宿主和寄生虫都表现出共同分散和隔离的距离,但宿主等位基因频率更为动态,显示出经常出现的遗传瓶.
寄生虫种群表现出高的共享异构性,但也表现出亚种群特定的同构性 (ROHs).
宿主群体结构和超群体动态在寄生虫中留下可追溯的基因组特征,表明加速漂移.

结论:

宿主群体结构和超群体动态显著影响了寄生虫的基因组进化.
宿主介导的寄生虫种群瓶可以导致寄生虫子种群中有害的ROHs的固定.
与预期相反,寄生虫可能比宿主进化得更慢,宿主动态可能会加速寄生虫漂移.

关键词:

达芬尼亚达芬尼亚是一个主体寄生虫的相互作用失去了异性性的损失.微型菌体微型菌体人口结构人口结构.运行的同卵性性同卵性.

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