冈比亚疟原虫基因组:对人类疟原虫进化的洞察。

The Genome of Plasmodium gonderi: Insights into the Evolution of Human Malaria Parasites.

机构信息

Biology Department/Institute of Genomics and Evolutionary Medicine (iGEM), Temple University, Philadelphia, PA 19122-1801, USA.

Departamento de Genética, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.

出版信息

Genome Biol Evol. 2024 Feb 1;16(2). doi: 10.1093/gbe/evae027.

Abstract

Plasmodium species causing malaria in humans are not monophyletic, sharing common ancestors with nonhuman primate parasites. Plasmodium gonderi is one of the few known Plasmodium species infecting African old-world monkeys that are not found in apes. This study reports a de novo assembled P. gonderi genome with complete chromosomes. The P. gonderi genome shares codon usage, syntenic blocks, and other characteristics with the human parasites Plasmodium ovale s.l. and Plasmodium malariae, also of African origin, and the human parasite Plasmodium vivax and species found in nonhuman primates from Southeast Asia. Using phylogenetically aware methods, newly identified syntenic blocks were found enriched with conserved metabolic genes. Regions outside those blocks harbored genes encoding proteins involved in the vertebrate host-Plasmodium relationship undergoing faster evolution. Such genome architecture may have facilitated colonizing vertebrate hosts. Phylogenomic analyses estimated the common ancestor between P. vivax and an African ape parasite P. vivax-like, within the Asian nonhuman primates parasites clade. Time estimates incorporating P. gonderi placed the P. vivax and P. vivax-like common ancestor in the late Pleistocene, a time of active migration of hominids between Africa and Asia. Thus, phylogenomic and time-tree analyses are consistent with an Asian origin for P. vivax and an introduction of P. vivax-like into Africa. Unlike other studies, time estimates for the clade with Plasmodium falciparum, the most lethal human malaria parasite, coincide with their host species radiation, African hominids. Overall, the newly assembled genome presented here has the quality to support comparative genomic investigations in Plasmodium.

摘要

导致人类疟疾的疟原虫不是单系的,它们与非人类灵长类寄生虫共有共同的祖先。冈比亚疟原虫是少数已知感染非洲旧世界猴子但不在猿类中发现的疟原虫之一。本研究报告了一个从头组装的具有完整染色体的冈比亚疟原虫基因组。冈比亚疟原虫基因组与人类寄生虫卵形疟原虫和间日疟原虫共享密码子使用、共线性块和其他特征,这些寄生虫也起源于非洲,以及人类寄生虫和来自东南亚的非人类灵长类动物中的寄生虫。使用系统发育感知方法,新鉴定的共线性块被发现富含保守代谢基因。这些块之外的区域则编码参与脊椎动物宿主-疟原虫关系的蛋白质,这些基因经历了更快的进化。这种基因组结构可能有助于疟原虫殖民脊椎动物宿主。系统发育基因组分析估计了间日疟原虫和一种非洲猿类寄生虫间日疟原虫样之间的共同祖先,位于亚洲非人类灵长类寄生虫类群内。包含冈比亚疟原虫的时间估计将间日疟原虫和间日疟原虫样的共同祖先置于更新世晚期,此时人类在非洲和亚洲之间进行积极的迁移。因此,系统发育和时间树分析与间日疟原虫起源于亚洲以及间日疟原虫样引入非洲的观点一致。与其他研究不同,携带最致命的人类疟疾寄生虫恶性疟原虫的类群的时间估计与宿主物种辐射,即非洲古人类,相吻合。总的来说,本文提出的新组装基因组具有支持疟原虫比较基因组研究的质量。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2255/10901558/9de2883ed4d7/evae027f1.jpg

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