Abstract
DNA sequence segments conserved since divergence of Escherichia coli and Bacillus subtilis were identified, using the GenBank sequence database. Chromosomal locations of the conserved segments were compared between the two bacteria, and the following three features were observed. (1) Although the two genomes are nearly identical in size, chromosomal arrangements of the conserved segments are considerably different from each other. (2) In many cases, chromosomal locations of a conserved segment in the two species have deviated from each other by a multiple of 60°. (3) There are many instances in which a contiguous segment in one genome is split into two or more segments located at distinct positions in the other genome, and these split segments were found to tend to lie on the E. coli or B. subtilis genome separated by distances of multiples of 60°. On the basis of these observations, genome organizations of the two bacteria were discussed in terms of genome doublings as well as random chromosomal rearrangements.
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Kunisawa, T. Identification and chromosomal distribution of DNA sequence segments conserved since divergence of Escherichia coli and Bacillus subtilis . J Mol Evol 40, 585–593 (1995). https://doi.org/10.1007/BF00160505
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DOI: https://doi.org/10.1007/BF00160505