Analysis of distribution indicates diverse functions of simple sequence repeats in Mycoplasma genomes

Molecular Biology and Evolution
Jan Mrázek

Abstract

Simple sequence repeats (SSRs) composed of extensive tandem iterations of a single nucleotide or a short oligonucleotide are rare in most bacterial genomes, but they are common among Mycoplasma. Some of these repeats act as contingency loci in association with families of surface antigens. By contraction or expansion during replication, these SSRs increase genetic variance of the population and facilitate avoidance of the immune response of the host. Occurrence and distribution of SSRs are analyzed in complete genomes of 11 Mycoplasma and 3 related Mollicutes in order to gain insights into functional and evolutionary diversity of the SSRs in Mycoplasma. The results revealed an unexpected variety of SSRs with respect to their distribution and composition and suggest that it is unlikely that all SSRs function as contingency loci or recombination hot spots. Various types of SSRs are most abundant in Mycoplasma hyopneumoniae, whereas Mycoplasma penetrans, Mycoplasma mobile, and Mycoplasma synoviae do not contain unusually long SSRs. Mycoplasma hyopneumoniae and Mycoplasma pulmonis feature abundant short adenine and thymine runs periodically spaced at 11 and 12 bp, respectively, which likely affect the supercoiling propensities of t...Continue Reading

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Feb 24, 2009·Molecular Biology and Evolution·Jan Mrázek
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