Evolutionary history of Wolbachia infections in the fire ant Solenopsis invicta.
Evolutionary history of Wolbachia infections in the fire ant Solenopsis invicta.
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沃尔巴基亚感染的进化史，在消防蚂蚁螺旋藻Invicta中。
DOI：
10.1186/1471-2148-5-35
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发表时间：
2005-05-31
影响因子：
3.4
通讯作者：
Shoemaker, D
中科院分区：
文献类型：
--
作者：
Ahrens, ME;Shoemaker, D
沃尔巴克氏菌是一种内共生细菌，通常感染许多节肢动物。尽管它们在分类上分布广泛，但这些细菌在寄主物种内部和之间的传播模式尚不清楚。我们从沃尔巴克氏菌基因组中测序了WSP基因的一部分，这些沃尔巴克氏菌感染了来自11个地理分布的本地火蚁种群的138个个体。然后，我们将这些WSP序列数据与感染和未感染宿主个体的线粒体DNA(MtDNA)变异模式进行比较，以推断沃尔巴克氏杆菌在不请自来链霉菌中的传播模式。不请自来链霉菌中存在三种不同的沃尔巴克氏菌(WSP)变种，它们都与先前在火蚁中描述的菌株相同。不请自来链霉菌的沃尔巴克氏菌变异的分布与mtDNA单倍型系统发育的比较表明，邀请链球菌至少在三次独立的情况下感染了沃尔巴克氏菌。不请自来链霉菌中一个常见的沃尔巴克氏菌变异株(WSinvictaB)与两个不同的mtDNA单倍型分支有关。此外，在每个分支中，沃尔巴克氏菌感染和未感染的个体拥有几乎相同的mtDNA单倍型亚型，包括推定的来源和祖先的mtDNA单倍型。同样的模式也适用于wSinvictaA，其中至少发生了一次甚至多达三次对S.invicta的入侵。这些数据表明，沃尔巴克氏菌对宿主蚂蚁种群的最初入侵可能是相对古老的，随着时间的推移，沃尔巴克氏菌在不同感染谱系中的多次继发损失。最后，我们的数据还提供了对先前报道的不请自来沙门氏菌种群中沃尔巴克氏菌流行率变化的因素的更多见解。不列颠链霉菌感染沃尔巴克氏菌的历史相当复杂，涉及沃尔巴克氏菌对该物种的多次入侵或水平传播事件。虽然这些沃尔巴克氏菌感染显然已经存在了相对较长的一段时间，但这些数据清楚地表明，沃尔巴克氏菌感染经常是在不同的谱系中继发消失的。重要的是，沃尔巴克氏菌和线粒体DNA基因组的分离传递表明，沃尔巴克氏菌对不列颠链霉菌内线粒体DNA进化的推测影响没有最初预测的那么严重。因此，普遍担心利用mtDNA标记来研究昆虫的进化史会受到母系遗传的内共生体的干扰，如Wolbachia，这在一定程度上可能是不必要的。
Wolbachia are endosymbiotic bacteria that commonly infect numerous arthropods. Despite their broad taxonomic distribution, the transmission patterns of these bacteria within and among host species are not well understood. We sequenced a portion of the wsp gene from the Wolbachia genome infecting 138 individuals from eleven geographically distributed native populations of the fire ant Solenopsis invicta. We then compared these wsp sequence data to patterns of mitochondrial DNA (mtDNA) variation of both infected and uninfected host individuals to infer the transmission patterns of Wolbachia in S. invicta. Three different Wolbachia (wsp) variants occur within S. invicta, all of which are identical to previously described strains in fire ants. A comparison of the distribution of Wolbachia variants within S. invicta to a phylogeny of mtDNA haplotypes suggests S. invicta has acquired Wolbachia infections on at least three independent occasions. One common Wolbachia variant in S. invicta (wSinvictaB) is associated with two divergent mtDNA haplotype clades. Further, within each of these clades, Wolbachia-infected and uninfected individuals possess virtually identical subsets of mtDNA haplotypes, including both putative derived and ancestral mtDNA haplotypes. The same pattern also holds for wSinvictaA, where at least one and as many as three invasions into S. invicta have occurred. These data suggest that the initial invasions of Wolbachia into host ant populations may be relatively ancient and have been followed by multiple secondary losses of Wolbachia in different infected lineages over time. Finally, our data also provide additional insights into the factors responsible for previously reported variation in Wolbachia prevalence among S. invicta populations. The history of Wolbachia infections in S. invicta is rather complex and involves multiple invasions or horizontal transmission events of Wolbachia into this species. Although these Wolbachia infections apparently have been present for relatively long time periods, these data clearly indicate that Wolbachia infections frequently have been secondarily lost within different lineages. Importantly, the uncoupled transmission of the Wolbachia and mtDNA genomes suggests that the presumed effects of Wolbachia on mtDNA evolution within S. invicta are less severe than originally predicted. Thus, the common concern that use of mtDNA markers for studying the evolutionary history of insects is confounded by maternally inherited endosymbionts such as Wolbachia may be somewhat unwarranted in the case of S. invicta.
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