达菲阴性宿主中的Plasmodium vivax的适应性进化:来自东非基因组的见解
Anthony Ford1,2, Cheikh Cambel Dieng3, Beka Raya Abagero3
1Department of Bioinformatics and Genomics, University of North Carolina at Charlotte, USA.
bioRxiv : the preprint server for biology
|December 5, 2025
概括
活疟原虫正在通过替代入侵机制适应感染非洲的Duffy阴性个体. 埃塞俄比亚Plasmodium vivax在Duffy阴性宿主中的分离体显示了遗传多样性的减少,但保留了基因组,表明了专门的适应.
科学领域:
- 遗传学 遗传学 是一个
- 寄生虫学的寄生虫学
- 进化生物学 进化生物学
背景情况:
- 疟疾Plasmodium vivax (Pv) 在非洲历史上罕见,原因是达菲抗原化学因子受体 (DARC) 缺失.
- 达菲阴性个体中Pv病例的增加表明演化了DARC独立的入侵机制.
研究的目的:
- 研究Pv在埃塞俄比亚Duffy阴性与Duffy阳性宿主中的遗传适应.
- 识别潜在的遗传变异和选择压力驱动Pv适应.
主要方法:
- 全基因组单核酸多态性 (SNP) 分析110个Pv分离物 (38个Duffy阴性,72个Duffy阳性).
- 对遗传多样性,SNP密度和积极选择信号的比较分析.
- 与全球Pv分离物种的遗传学比较.
主要成果:
- 来自Duffy阳性宿主的Pv显示出比Duffy阴性 (197,461个SNP) 更高的遗传变异 (477,561个SNP).
- 像TRAg3,TRAg34和MSP3家族这样的基因表现出高的核酸多样性.
- 积极选择信号有所不同:耐药性/红细胞结合在达菲阳性;器官维护/贩运在达菲阴性Pv.
- 达菲阴性宿主中的Pv显示了基因组多样性的减少和高度的保存,这表明了强大的选择性约束.
结论:
- 达菲阴性种群中的Pv分离物保持了基因保存的背景.
- 在Pv的适应可能涉及DARC-独立入侵的替代代代谢或贩运途径.
- 这些发现突出了严格的进化瓶和专门的宿主-寄生虫相互作用.
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