Evolution of gene orders in genomes of cyanobacteria |
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Authors: | A V Markov I A Zakharov |
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Institution: | 1.Paleontological Institute,Russian Academy of Sciences,Moscow,Russia;2.Vavilov Institute of General Genetics,Russian Academy of Sciences,Moscow,Russia |
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Abstract: | Genomes of 23 strains of cyanobacteria were comparatively analyzed using quantitative methods of estimation of gene order
similarity. It has been found that reconstructions of phylogenesis of cyanobacteria based on the comparison of the orders
of genes in chromosomes and nucleotide sequences appear to be similar. This confirms the applicability of quantitative measures
of similarity of gene orders for phylogenetic reconstructions. In the evolution of marine unicellular planktonic cyanobacteria,
genome rearrangements are fixed with a low rate (about 3% of gene order changes per 1% of 16S rRNA changes), whereas in other
groups of cyanobacteria the gene order can change several times more rapidly. The gene orders in genomes of cyanobacteria
and chloroplasts preserve a considerable degree of similarity. The closest relatives of chloroplasts among the analyzed cyanobacteria
are likely to be strains from hot springs belonging to the genus Synechococcus. Comparative analysis of gene orders and nucleotide sequences strongly suggests that Synechococcus strains from different environments (sea, fresh waters, hot springs) are not related and belong to evolutionally distant
lines. |
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