Bacteriocyte-like cells harbour Wolbachia in the ovary of Drosophila melanogaster (Insecta, Diptera) and Zyginidia pullula (Insecta, Hemiptera)
Bacteriocyte-like cells harbour Wolbachia in the ovary of Drosophila melanogaster (Insecta, Diptera) and Zyginidia pullula (Insecta, Hemiptera)
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DOI：
10.1016/j.tice.2010.07.009
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发表时间：
2010-10-01
期刊：
影响因子：
2.6
通讯作者：
Bandi, Claudio
中科院分区：
文献类型：
--
作者：
Sacchi, Luciano;Genchi, Marco;Bandi, Claudio
沃尔巴克氏体是昆虫中分布最广的细菌内共生体。它负责宿主的各种生殖变化。沃尔巴克氏体通过生殖系从母亲传播给后代，在极少数情况下，在个体之间传播。这意味着获得的特性（通过与沃尔巴克氏体的共生）可以遗传。我们研究了沃尔巴克氏体在两种系统发育上相距较远的昆虫——黑腹果蝇（Drosophila melanogaster）和扎吉尼迪亚（Zyginidia pullula）中的跨社会遗传。我们在两个系统中都检测到卵巢尖端的细菌细胞样细胞，密集地挤满了沃尔巴克氏体内共生体。细菌细胞是专门用来容纳细菌的细胞，是典型的昆虫共生共生。我们对卵巢中窝藏沃尔巴克氏体的细菌细胞样细胞的观察强调了昆虫雌性生殖系统的可塑性，当一些细胞被细菌密集定植时，雌性生殖系统仍能维持其功能。总之，有来自不同昆虫的证据表明，作为繁殖寄生虫的细菌被类似于细菌细胞的细胞所庇护，这些细胞似乎介导了细菌向后代的传播。考虑到沃尔巴克氏体并不是果蝇和扎吉尼亚的强制性共生体，我们观察到的细菌细胞样细胞不是宿主和共生体共同进化的结果，这似乎是一个有效的假设。(C) 2010 Elsevier Ltd.版权所有。
Wolbachia is the most widespread bacterial endosymbiont in insects. It is responsible for a variety of reproductive alterations of the hosts. Wolbachia is transmitted through the germline from mother to offspring and, in rare cases, between individuals. This implies that acquired properties (through symbiosis with Wolbachia) can become heritable. We investigated the transovarial inheritance of Wolbachia in two phylogenetically distant insects, Drosophila melanogaster and Zyginidia pullula. We detected in both systems bacteriocyte-like cells, densely packed with Wolbachia endosymbionts, at the tip of the ovarioles. Bacteriocytes are cells specialized to harbour bacteria, typical of mutualistic insect symbiosis. Our observations of bacteriocyte-like cells harbouring Wolbachia in the ovary emphasize the plasticity of the female reproductive system of insects, which maintains its function while some cells are densely colonized by bacteria. In summary, there is evidence from different insects that bacteria which behave as parasites of reproduction are harboured by cells resembling bacteriocytes, which appear to mediate transmission of the bacteria to the progeny. It seems a valid hypothesis that the bacteriocyte-like cells that we observed are not the result of a co-evolution of host and symbiont, considering that Wolbachia is not an obligatory symbiont in Drosophila and Zyginidia. (C) 2010 Elsevier Ltd. All rights reserved.