Gaisin Vasil A, Grouzdev Denis S, Namsaraev Zorigto B, Sukhacheva Marina V, Gorlenko Vladimir M, Kuznetsov Boris B
Institute of Bioengineering, Research Center of Biotechnology of the Russian Academy of Sciences, Leninsky Ave., 33, bld. 2, Moscow 119071, Russian Federation
Institute of Bioengineering, Research Center of Biotechnology of the Russian Academy of Sciences, Leninsky Ave., 33, bld. 2, Moscow 119071, Russian Federation.
FEMS Microbiol Ecol. 2016 Mar;92(3). doi: 10.1093/femsec/fiw012. Epub 2016 Jan 28.
Isolated environments such as hot springs are particularly interesting for studying the microbial biogeography. These environments create an 'island effect' leading to genetic divergence. We studied the phylogeographic pattern of thermophilic anoxygenic phototrophic bacteria, belonging to the Roseiflexus genus. The main characteristic of the observed pattern was geographic and geochronologic fidelity to the hot springs within Circum-Pacific and Alpine-Himalayan-Indonesian orogenic belts. Mantel test revealed a correlation between genetic divergence and geographic distance among the phylotypes. Cluster analysis revealed a regional differentiation of the global phylogenetic pattern. The phylogeographic pattern is in correlation with geochronologic events during the break up of Pangaea that led to the modern configuration of continents. To our knowledge this is the first geochronological scenario of intercontinental prokaryotic taxon divergence. The existence of the modern phylogeographic pattern contradicts with the existence of the ancient evolutionary history of the Roseiflexus group proposed on the basis of its deep-branching phylogenetic position. These facts indicate that evolutionary rates in Roseiflexus varied over a wide range.
诸如温泉这样的孤立环境对于研究微生物生物地理学而言特别有趣。这些环境会产生一种“岛屿效应”，从而导致基因分化。我们研究了属于玫瑰弯曲菌属的嗜热厌氧光合细菌的系统发育地理模式。观察到的模式的主要特征是在环太平洋和阿尔卑斯 - 喜马拉雅 - 印度尼西亚造山带内对温泉具有地理和地质年代学上的忠实性。Mantel检验揭示了系统发育型之间基因分化与地理距离之间的相关性。聚类分析揭示了全球系统发育模式的区域分化。这种系统发育地理模式与泛大陆解体期间导致现代大陆构造的地质年代学事件相关。据我们所知，这是首次关于洲际原核生物分类群分化的地质年代学设想。现代系统发育地理模式的存在与基于玫瑰弯曲菌属深分支系统发育位置所提出的该类群古老进化历史的存在相矛盾。这些事实表明玫瑰弯曲菌属的进化速率在很宽的范围内变化。
