三种叶甲虫的阳性选择的谱系特异性目标与它们对共享的寄生虫黄蜂的防御能力相符
Xuyue Yang1, Kalle Tunström2,3, Tanja Slotte1
1Department of Ecology, Environment and Plant Sciences, Stockholm University, Stockholm, 10691, Sweden.
Heredity
|September 8, 2025
概括
寄生虫黄蜂驱动着叶虫免疫力的适应性进化. 较强的免疫能力较强的物种对免疫基因,特别是早期反应基因表现出更积极的选择.
科学领域:
- 进化生物学 进化生物学
- 免疫学 免疫学 免疫学
- 生态生态学 生态生态学
背景情况:
- 寄生虫黄蜂是显著的死亡因素,推动宿主免疫系统的进化.
- 了解非模型昆虫的免疫基因进化对于宿主-寄生虫动态至关重要.
- 虫叶甲虫对寄生虫Asecodes parviclava表现出不同的反应.
研究的目的:
- 为了研究免疫基因在三个相关的Galerucella叶甲虫物种的适应性进化.
- 为了比较与寄生虫防御相关的免疫基因上的积极选择的签名.
- 将免疫基因的基因型变异与表型免疫能力差异联系起来.
主要方法:
- 采用了两种积极选择的测试:基于子的测试和全基因组的单 haplotype 频谱分析.
- 在G. pusilla (强大的免疫能力) 和G. tenella/G. 之间比较免疫基因进化. 卡尔马里内斯 (较弱的免疫能力).
- 专注于寄生虫相关的免疫基因,特别是那些参与早期免疫反应级联的免疫基因.
主要成果:
- 基于Codon的测试显示,与G. tenella和G. calmariensis相比,高免疫能力的G. pusilla对免疫基因的积极选择更强.
- 积极选择的免疫基因在免疫反应级联的早期阶段被丰富.
- 全基因组分析显示,所有三种物种的免疫基因都具有类似的近期选择特征.
结论:
- 主体免疫基因的进化速度和模式因免疫能力水平而异.
- 早期免疫反应基因是对抗寄生虫的适应性进化的主要目标.
- 在昆虫免疫能力和宿主-寄生虫相互作用中为将基因型与表型连接提供了一个框架.
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