Phylogeny of the nematode genus Pristionchus and implications for biodiversity, biogeography and the evolution of hermaphroditism.
Phylogeny of the nematode genus Pristionchus and implications for biodiversity, biogeography and the evolution of hermaphroditism.
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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。
DOI：
10.1186/1471-2148-7-104
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发表时间：
2007-07-02
影响因子：
3.4
通讯作者：
Sommer, Ralf J.
中科院分区：
文献类型：
--
作者：
Mayer, Werner E.;Herrmann, Matthias;Sommer, Ralf J.
太平洋隐杆线虫最初是作为一种卫星生物发展起来的，用于与秀丽隐杆线虫进行比较。太平洋假单胞虫全基因组的10倍覆盖率是可用的，使太平洋假单胞虫成为第一个具有完全基因组测序的非隐杆线虫。太平洋拟虫和秀丽隐杆线虫之间的宏观进化比较已被拟虫属内密切相关的菌株和物种的微观进化研究所补充。此外，野外研究对柱头线虫生物学的新认识表明，柱头线虫与各种圣甲虫和科罗拉多马铃薯甲虫有密切的联系，支持在生态系统研究中考虑这种线虫。在四大洲的野外研究过程中，从15000个甲虫标本中分离出1200多个分离株。趋化性研究表明，狱狱虫-甲虫结社的两个显著特征是相互作用的高度物种特异性和线虫截获甲虫的性交流系统以识别寄主。在发育、行为和生态模式上的差异的进化解释需要一个囚徒属的系统发育框架。在此，我们基于27个核糖体蛋白基因，共10,971 bp，提供了所有18个可用的囚徒物种的强大系统发育。系统发育树为北美和欧洲的进化枝提供了证据，这些进化枝嵌入了包括亚洲物种在内的更深的进化枝中。它还表明假定的入侵事件。在18种柱头蚊中，13种雌雄同体，5种雌雄同体。系统发育表明，所有雌雄同体的种都是在柱头龙属内独立产生的。结合核糖体蛋白cDNA数据可以为微进化和生物地理分析提供一个强大的系统发育框架的重建基础。我们的研究的另一个重要意义是利用刺头蚊进行线虫生物多样性评估。虽然一些物种有100多个分离株，但其他物种的发现次数不到4次。在所有大陆和所有系统发育分支中都观察到这种模式，这表明物种不对称是一种普遍存在的现象，现在可以通过分子工具进一步研究。
The nematode Pristionchus pacificus has originally been developed as a satellite organism for comparison to Caenorhabditis elegans. A 10X coverage of the whole genome of P. pacificus is available, making P. pacificus the first non-Caenorhabditis nematode with a fully sequenced genome. The macroevolutionary comparison between P. pacificus and C. elegans has been complemented by microevolutionary studies of closely related strains and species within the genus Pristionchus. In addition, new understanding of the biology of Pristionchus from field studies, demonstrating a close association with various scarab beetles and the Colorado potato beetle, supports consideration of this nematode in studies of ecosystems. In the course of field studies on four continents more than 1,200 isolates were established from 15,000 beetle specimens representing 18 Pristionchus species. Two remarkable features of the Pristionchus – beetle association are the high species specificity of the interaction and the interception of the beetle's sex communication system for host recognition by the nematodes, as suggested by chemotaxis studies. Evolutionary interpretations of differences in developmental, behavioral and ecological patterns require a phylogenetic framework of the genus Pristionchus. Here, we provide a robust phylogeny of all 18 available Pristionchus species based on a set of 27 ribosomal protein genes encompassing a total of 10,971 bp. The phylogenetic tree provides evidence for North American and European clades, which are embedded in a deeper clade that includes Asian species. It also indicates putative invasion events. Of the 18 Pristionchus species, 13 are gonochoristic and five are hermaphroditic. The phylogeny indicates that all hermaphroditic species have arisen independently within the genus Pristionchus. Combined ribosomal protein cDNA data can provide the basis for reconstruction of a robust phylogenetic framework for microevolutionary and biogeographic analyses. An additional major implication of our studies is the use of Pristionchus for nematode biodiversity assessments. While some species are represented by more than 100 isolates, others were found less than four times. Such patterns were observed on all continents and in all phylogenetic clades indicating that species asymmetry is a widespread phenomenon, which can now be further investigated by molecular tools.
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影响因子：
2.5
作者：
Caterino, MS;Shull, VL;Vogler, AP
通讯作者：
Vogler, AP
影响因子：
6.8
作者：
AKAIKE, H
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9.2
作者：
Hong, Ray L.;Sommer, Ralf J.
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Sommer, Ralf J.
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作者：
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通讯作者：
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作者：
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Nei, M