Cytoplasmic incompatibility in the parasitic wasp Encarsia inaron: disentangling the roles of Cardinium and Wolbachia symbionts.
Cytoplasmic incompatibility in the parasitic wasp Encarsia inaron: disentangling the roles of Cardinium and Wolbachia symbionts.
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DOI：
10.1038/hdy.2009.5
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发表时间：
2009-05
期刊：
影响因子：
3.8
通讯作者：
Hunter, M. S.
中科院分区：
文献类型：
--
作者：
White, J. A.;Kelly, S. E.;Perlman, S. J.;Hunter, M. S.
关键词：
昆虫的许多细菌内共生体能够操纵其宿主的繁殖以获得自身的利益。最常见的操作策略是细胞质不相容性（CI），其中未感染的雌性和感染的雄性之间的交配导致胚胎死亡。相反，胚胎在感染的雌性中正常发育，无论其配偶是否被感染，并产生感染的后代。通过这种方式，受感染的雌性在昆虫种群中的比例增加，从而促进了母体遗传细菌的传播。但是，当多个内共生体栖息在同一宿主体内时会发生什么呢？寄生蜂Encarsia inaron自然感染了两种不相关的内共生体Cardinium和Wolbachia，这两种内共生体都被证明会导致其他昆虫的CI。双重感染的黄蜂显示CI表型。我们区别性地治愈了E每种内共生体的inaron，和不同感染状态的交叉宿主，以确定是否一种或两种细菌引起观察到的CI表型，以及两种共生体是否在其共同宿主内相互作用。我们发现Wolbachia引起E. inaron，但Cardinium没有。我们没有发现Cardinium能够改变或挽救Wolbachia诱导的CI的证据，我们也没有发现Cardinium引起后代性别比例扭曲，留下Cardinium在E. inaron是个谜。
Many bacterial endosymbionts of insects are capable of manipulating their host’s reproduction for their own benefit. The most common strategy of manipulation is cytoplasmic incompatibility (CI), in which embryonic mortality results from matings between uninfected females and infected males. In contrast, embryos develop normally in infected females, whether or not their mate is infected, and infected progeny are produced. In this way, the proportion of infected females increases in the insect population, thereby promoting the spread of the maternally-inherited bacteria. But what happens when multiple endosymbionts inhabit the same host? The parasitoid wasp Encarsia inaron is naturally infected with two unrelated endosymbionts, Cardinium and Wolbachia, both of which have been documented to cause CI in other insects. Doubly-infected wasps show the CI phenotype. We differentially cured E. inaron of each endosymbiont, and crossed hosts of different infection status to determine whether either or both bacteria caused the observed CI phenotype in this parasitoid, and whether the two symbionts interacted within their common host. We found that Wolbachia caused CI in E. inaron, but Cardinium did not. We did not find evidence that Cardinium was able to modify or rescue Wolbachia-induced CI, nor did we find that Cardinium caused progeny sex ratio distortion, leaving the role of Cardinium in E. inaron a mystery.
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