Journal
ANTONIE VAN LEEUWENHOEK INTERNATIONAL JOURNAL OF GENERAL AND MOLECULAR MICROBIOLOGY
Volume 92, Issue 3, Pages 359-365Publisher
SPRINGER
DOI: 10.1007/s10482-007-9165-3
Keywords
phylogeny; actinobacteria; genome; gene order; transposition
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The availability of genomic sequence data allows new challenges to various biological problems. One of such attempts is the extraction of phylogenetic information from gene order data of genomes. Phylogenetic inferences are most commonly carried out on the basis of 16S rRNA trees, which sometimes produce unresolved or unreliable branching orders. One example for such a low resolution is recognized in the branching pattern among the phylum Actinobacteria. Here, gene arrangements characteristic of the Actinobacteria were identified, based on which Symbiobacterium thermophilum is phylogenetically placed outside that phylum, this being in contrast to 16S rRNA trees and to the current taxonomy in GenBank. Three transposition suggestive arrangements were found which support a notion that Rubrobacter xylanophilus is the earliest diverging species among the completely sequenced Actinobacteria. The gene arrangements identified here serve as a complement to previously reported indels and proteins characteristic of this phylum.
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