title: Biogeography of thermophilic phototrophic bacteria belonging to Roseiflexus genus.
abstract: 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.
authors.affiliation: Institute of Bioengineering, Research Center of Biotechnology of the Russian Academy of Sciences, Leninsky Ave., 33, bld. 2, Moscow 119071, Russian Federation vasil.beingi@gmail.com.
authors.forename: Vasil A
authors.initials: VA
authors.lastname: Gaisin
authors.affiliation: Institute of Bioengineering, Research Center of Biotechnology of the Russian Academy of Sciences, Leninsky Ave., 33, bld. 2, Moscow 119071, Russian Federation.
authors.forename: Denis S
authors.initials: DS
authors.lastname: Grouzdev
authors.affiliation: Winogradsky Institute of Microbiology, Research Center of Biotechnology of the Russian Academy of Sciences, Leninsky Ave., 33, bld. 2, Moscow 119071, Russian Federation Department of Biotechnology and Bioenergy, National Research Centre 'Kurchatov Institute', Akademika Kurchatova pl., 1, Moscow 123182, Russian Federation.
authors.forename: Zorigto B
authors.initials: ZB
authors.lastname: Namsaraev
authors.affiliation: Institute of Bioengineering, Research Center of Biotechnology of the Russian Academy of Sciences, Leninsky Ave., 33, bld. 2, Moscow 119071, Russian Federation.
authors.forename: Marina V
authors.initials: MV
authors.lastname: Sukhacheva
authors.affiliation: Winogradsky Institute of Microbiology, Research Center of Biotechnology of the Russian Academy of Sciences, Leninsky Ave., 33, bld. 2, Moscow 119071, Russian Federation.
authors.forename: Vladimir M
authors.initials: VM
authors.lastname: Gorlenko
authors.affiliation: Institute of Bioengineering, Research Center of Biotechnology of the Russian Academy of Sciences, Leninsky Ave., 33, bld. 2, Moscow 119071, Russian Federation.
authors.forename: Boris B
authors.initials: BB
authors.lastname: Kuznetsov
mesh_terms: D005075:Biological Evolution; D041862:Chloroflexi / Q000145:classification / Q000235:genetics / Q000302:isolation & purification* / Q000378:metabolism; D045482:Hot Springs / Q000382:microbiology*; D007214:Indonesia; D008969:Molecular Sequence Data; D052817:Phototrophic Processes; D010802:Phylogeny
keywords: Roseiflexus; bacterial speciation; evolutionary rates; geotype; microbial biogeography; phylogeography