植物内遗传漂移控制病毒适应宿主耐药基因
Lucie Tamisier1,2, Frédéric Fabre3, Marion Szadkowski1,2
1INRAE, Pathologie Végétale, F-84140 Montfavet, France.
PLoS pathogens
|August 5, 2024
概括
操纵宿主遗传漂移和耐药性可以防止病原体的进化. 增加的遗传漂移 (低有效种群规模,Ne) 和宿主耐药性 (低初始病毒适应性,Wi) 限制了胡植物中的土豆病毒Y (PVY) 适应.
科学领域:
- 植物病理学 植物病理学
- 进化生物学是进化的生物学.
- 病毒学 病毒学
背景情况:
- 主体-病原体相互作用驱动病原体进化.
- 遗传漂移和选择是关键的进化力量.
- 缺乏操纵这些力量在植物病原体系统中的实验证据.
研究的目的:
- 研究宿主遗传背景对土豆病毒Y (PVY) 演变的影响.
- 实验测试遗传漂移和抗性效率在控制PVY适应中的作用.
主要方法:
- 在七个月的时间里,64个PVY种群在6个对比的Capsicum annuum (胡) 线上连续过渡.
- 对PVY VPg cistron进行测序,以确定适应性突变.
- 分析病毒进化轨迹与宿主遗传漂移 (有效种群大小,Ne) 和抗性效率 (初始复制性适应性,Wi) 的关系.
主要成果:
- PVY种群表现出不同的进化轨迹,包括灭绝和健身增长.
- 在VPgcistron中的适应性突变与复制性适应性增加有关.
- 主体遗传漂移 (Ne) 和抵抗效率 (Wi) 显著影响了PVY进化.
- 低Ne (强漂移) 维持了初始PVY健身,而高Ne (弱漂移) 导致了高的最终健身,无论初始条件如何.
结论:
- 结合高宿主耐药性 (低Wi) 和强大的遗传漂移 (低Ne),增强了对病毒适应的耐药性.
- 这一战略提供了一种有希望的方法,以防止像PVY.这样的植物病毒的长期适应.
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