Male-killing Wolbachia in two species of insect
Male-killing Wolbachia in two species of insect
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DOI：
10.1098/rspb.1999.0698
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发表时间：
1999-04-07
影响因子：
4.7
通讯作者：
Majerus, MEN
中科院分区：
文献类型：
--
作者：
Hurst, GDD;Jiggins, FM;Majerus, MEN
遗传性细菌沃尔巴克氏体通过操纵宿主繁殖而传播，并且被认为是节肢动物进化的重要因素：从宿主物种形成到性别决定系统的进化。过去的研究表明，这一群体的成员可能会产生细胞质不相容性，雌性化遗传雄性宿主，并诱导宿主孤雌生殖。在这里，我们报告了该分支成员产生的生殖操纵范围的扩展，记录了沃尔巴克氏体菌株，这些菌株在两种宿主物种（瓢虫Adalia bipunctata和蝴蝶Acraea encedon）的胚胎发生过程中杀死雄性宿主。这两种杀死男性的细菌都属于沃尔巴克氏体的B组。然而，系统发育分析无法解决这两个物种中的细菌是否是单系的，或者代表B组沃尔巴克氏体中男性杀戮的独立起源。我们还发现在不同的A. bipunctata个体，表明该宿主种含有两个Wolbachia菌株，wsp序列存在分歧，但为单系。我们的观察结果加强了这样一个概念，即沃巴赫菌可能是一个重要的代理驱动节肢动物的进化，并证实了以前的建议，男性杀死行为很容易演变的无脊椎动物共生体。
The inherited bacterium Wolbachia spreads through the manipulation of host reproduction, and has been suggested to be an important factor in arthropod evolution: from host speciation to the evolution of sex-determination systems. Past work has shown that members of this group may produce cytoplasmic incompatibility, feminize genetically male hosts, and induce host parthenogenesis. Here, we report an expansion of the range of reproductive manipulations produced by members of this clade, recording Wolbachia strains that kill male hosts during embryogenesis in two host species, the ladybird Adalia bipunctata, and the butterfly Acraea encedon. Both male-killing bacteria belong to the B group of Wolbachia. However, phylogenetic analyses were unable to resolve whether the bacteria in the two species are monophyletic, or represent independent origins of male-killing among the B-group Wolbachia. We also found significant divergence within the wsp gene of Wolbachia strains found in different A. bipunctata individuals, suggesting this host species contains two Wolbachia strains, diverged in wsp sequence but monophyletic. Our observations reinforce the notion that Wobbachia may be an important agent driving arthropod evolution, and corroborates previous suggestions that male-killing behaviour is easily evolved by invertebrate symbionts.