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KMID : 0380020030180010039
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Korean Journal of Biotechnology and Bioengineering
2003 Volume.18 No. 1 p.39 ~ p.44
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Classification of Archaebacteria and Bacteria using a Gene Content Tree Approach
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Lee Dong-Geun
Kim Su-Ho
Lee Sang-Hyeon
Kim Cheol-Min
Kim Sang-Jin
Lee Jae-Hwa
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Abstract
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A Gene content phylogenetic tree and a 16s rRNA based phylogenetic tree were compared for 33 whole-genome sequenced procaryotes, neighbor joining and bootstrap methods (n=1,000). Ratio of conserved COG (clusters of orthologous groups of proteins) to orthologs revealed that they were within the range of 4.60% (Mezorhizobium loti) or 56.57% (Mycopiasma genitalium). This meant that the ratio was diverse among analyzed procaryotes and indicated the possibility of searching for useful genes. Over 20% of orthologs were independent among the same species. The gene content tree and the 16s rDNA tree showed coincidence and discordance in Archaeabacteria, Proteobacteria and Firmicutes. This might have resulted from non-conservative genes in the gene content phylogenetic tree and horizontal gene transfer. The COG based gene content tree could be regarded as a midway phylogeny based on biochemical tests and nucleotide sequences.
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KEYWORD
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Archaebacteria, proteobacteria, Firmicutes, 16s rRNA, gene content tree
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