Molecular phylogeny of beetle associated diplogastrid nematodes suggests host switching rather than nematode-beetle coevolution.
Molecular phylogeny of beetle associated diplogastrid nematodes suggests host switching rather than nematode-beetle coevolution.
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DOI：
10.1186/1471-2148-9-212
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发表时间：
2009-08-24
影响因子：
3.4
通讯作者：
Sommer RJ
中科院分区：
文献类型：
--
作者：
Mayer WE;Herrmann M;Sommer RJ
线虫是物种最丰富的动物门。它们有不同的生活方式，并出现在各种栖息地，从水生或陆生环境中的自由生活线虫到动物和植物的寄生虫。杆状线虫秀丽隐杆线虫是现代生物学中最重要的模式生物之一。已将Diplogastridae科的太平洋棱纹天牛（Pristionchus pacificus）发展为与C.优美的Diplogastridae是杆状线虫的一个单系分支，经常与甲虫联系在一起。这种甲虫与线虫的关联是如何进化的，以及甲虫与线虫是否发生了共同进化，仍然是一个谜。作为回答这个问题的先决条件，一个强大的甲虫相关的Diplogastridae的繁殖是必要的。收集了14个双腹鱼分类群的核小亚基核糖体RNA和12个核糖体蛋白编码核苷酸序列的序列，得到5996 bp的串联比对序列的数据集。通过多种算法建立了甲虫共生双腹线虫的分子系统学。强大的分支可以证明嵌入系统发育树拓扑结构与短的内部分支，表明快速的祖先分歧。比较diplogastrid的一个全面的甲虫的进化，没有发现重大的一致性，因此没有证据表明长期的共同进化。重建甲虫相关Diplogastridae的系统发育历史产生四个不同的亚支，其深的系统发育分歧，短的内部分支长度所示，古代快速辐射事件的继承进化的证据。双腹甲科的茎种存在于甲类主要辐射发生的同一时期。比较线虫和甲虫的共生性，但是，没有证据表明diplogastrid线虫和它们的甲虫宿主的长期共同进化。相反，观察到频繁的主机切换。Diplogastridae的分子系统发生学为进一步研究这些协会的进化，生态系统内的相互作用的研究，以及diplogastridd基因组进化的调查提供了一个框架。
Nematodes are putatively the most species-rich animal phylum. They have various life styles and occur in a variety of habitats, ranging from free-living nematodes in aquatic or terrestrial environments to parasites of animals and plants. The rhabditid nematode Caenorhabditis elegans is one of the most important model organisms in modern biology. Pristionchus pacificus of the family of the Diplogastridae has been developed as a satellite model for comparison to C. elegans. The Diplogastridae, a monophyletic clade within the rhabditid nematodes, are frequently associated with beetles. How this beetle-association evolved and whether beetle-nematode coevolution occurred is still elusive. As a prerequisite to answering this question a robust phylogeny of beetle-associated Diplogastridae is needed. Sequences for the nuclear small subunit ribosomal RNA and for 12 ribosomal protein encoding nucleotide sequences were collected for 14 diplogastrid taxa yielding a dataset of 5996 bp of concatenated aligned sequences. A molecular phylogeny of beetle-associated diplogastrid nematodes was established by various algorithms. Robust subclades could be demonstrated embedded in a phylogenetic tree topology with short internal branches, indicating rapid ancestral divergences. Comparison of the diplogastrid phylogeny to a comprehensive beetle phylogeny revealed no major congruence and thus no evidence for a long-term coevolution. Reconstruction of the phylogenetic history of beetle-associated Diplogastridae yields four distinct subclades, whose deep phylogenetic divergence, as indicated by short internal branch lengths, shows evidence for evolution by successions of ancient rapid radiation events. The stem species of the Diplogastridae existed at the same time period when the major radiations of the beetles occurred. Comparison of nematode and beetle phylogenies provides, however, no evidence for long-term coevolution of diplogastrid nematodes and their beetle hosts. Instead, frequent host switching is observed. The molecular phylogeny of the Diplogastridae provides a framework for further examinations of the evolution of these associations, for the study of interactions within the ecosystems, and for investigations of diplogastrid genome evolution.
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影响因子：
5.8
作者：
Posada, D;Crandall, KA
通讯作者：
Crandall, KA
线虫属Pristionchus的系统发育及其对生物多样性，生物地理学和雌雄同体的进化的影响。
影响因子：
3.4
作者：
Mayer, Werner E.;Herrmann, Matthias;Sommer, Ralf J.
通讯作者：
Sommer, Ralf J.
影响因子：
30.8
作者：
Dieterich, Christoph;Clifton, Sandra W.;Schuster, Lisa N.;Chinwalla, Asif;Delehaunty, Kimberly;Dinkelacker, Iris;Fulton, Lucinda;Fulton, Robert;Godfrey, Jennifer;Minx, Pat;Mitreva, Makedonka;Roeseler, Waltraud;Tian, Huiyu;Witte, Hanh;Yang, Shiaw-Pyng;Wilson, Richard K.;Sommer, Ralf J.
通讯作者：
Sommer, Ralf J.
影响因子：
2.8
作者：
Herrmann, Matthias;Mayer, Werner E;Sommer, Ralf J
通讯作者：
Sommer, Ralf J
影响因子：
6.8
作者：
AKAIKE, H
通讯作者：
AKAIKE, H