Horizontally transmitted symbionts and host colonization of ecological niches.
Horizontally transmitted symbionts and host colonization of ecological niches.
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水平传播的共生体和生态壁ches的宿主定植。
DOI：
10.1016/j.cub.2013.07.029
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发表时间：
2013-09-09
期刊：
影响因子：
9.2
通讯作者：
Godfray, H. Charles J.
中科院分区：
文献类型：
--
作者：
Henry, Lee M.;Peccoud, Jean;Simon, Jean-Christophe;Hadfield, Jarrod D.;Maiden, Martin J. C.;Ferrari, Julia;Godfray, H. Charles J.
兼性或“次生”共生体在真核生物中很常见，尤其是昆虫。虽然它们对宿主的生存不是必不可少的，但它们经常提供显著的健康益处。有人假设，次生共生体形成一个“水平基因库”，以类似于细菌中的质粒和其他可移动的遗传元件的方式，在宿主谱系之间穿梭适应基因。然而，我们不知道共生菌在宿主群体中的分布是否反映了随机获取随后的垂直遗传，或者这种关联是否以一种与动态水平基因库一致的方式重复发生。在这里，我们利用1104种豌豆蚜虫携带的次生共生体的系统发育和生态分布来探索这些问题。我们发现，水平转移不仅是常见的，而且还与新的生态位，包括新的植物物种和气候区域的定居有关。此外，世界各地生态环境相同的蚜虫已经独立获得了相关的共生体基因类型，这表明共生体在其宿主对不同生态位的适应中发挥了重要作用。我们认为，次生共生群落形成了一个水平基因库，影响了寄主的适应和分布。这些发现突显了共生微生物在真核生物辐射中的重要性。
Facultative or “secondary” symbionts are common in eukaryotes, particularly insects. While not essential for host survival, they often provide significant fitness benefits. It has been hypothesized that secondary symbionts form a “horizontal gene pool” shuttling adaptive genes among host lineages in an analogous manner to plasmids and other mobile genetic elements in bacteria. However, we do not know whether the distributions of symbionts across host populations reflect random acquisitions followed by vertical inheritance or whether the associations have occurred repeatedly in a manner consistent with a dynamic horizontal gene pool. Here we explore these questions using the phylogenetic and ecological distributions of secondary symbionts carried by 1,104 pea aphids, Acyrthosiphon pisum. We find that not only is horizontal transfer common, but it is also associated with aphid lineages colonizing new ecological niches, including novel plant species and climatic regions. Moreover, aphids that share the same ecologies worldwide have independently acquired related symbiont genotypes, suggesting significant involvement of symbionts in their host’s adaptation to different niches. We conclude that the secondary symbiont community forms a horizontal gene pool that influences the adaptation and distribution of their insect hosts. These findings highlight the importance of symbiotic microorganisms in the radiation of eukaryotes.
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DOI：
10.1073/pnas.0611659104
发表时间：
2007-05-15
影响因子：
11.1
作者：
Moran, Nancy A.
通讯作者：
Moran, Nancy A.
影响因子：
3.3
作者：
Tsuchida, Tsutomu;Koga, Ryuichi;Fukatsu, Takema
通讯作者：
Fukatsu, Takema
影响因子：
2.6
作者：
Excoffier, Laurent;Laval, Guillaume;Schneider, Stefan
通讯作者：
Schneider, Stefan
影响因子：
16.8
作者：
Jaenike, John
通讯作者：
Jaenike, John
影响因子：
8.8
作者：
Lukasik, Piotr;van Asch, Margriet;Godfray, H. Charles J.
通讯作者：
Godfray, H. Charles J.