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INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY logo

Volume 65, Issue Pt_8

Occurrence, distribution and possible functional roles of simple sequence repeats in phytoplasma genomes Free

Abstract

Phytoplasmas are unculturable, cell-wall-less bacteria that parasitize plants and insects. This transkingdom life cycle requires rapid responses to vastly different environments, including transitions from plant phloem sieve elements to various insect tissues and alternations among diverse plant hosts. Features that enable such flexibility in other microbes include simple sequence repeats (SSRs) — mutation-prone, phase-variable short DNA tracts that function as ‘evolutionary rheostats’ and enhance rapid adaptations. To gain insights into the occurrence, distribution and potentially functional roles of SSRs in phytoplasmas, we performed computational analysis on the genomes of five completely sequenced phytoplasma strains, ‘ Phytoplasma asteris’-related strains OYM and AYWB, ‘ Phytoplasma australiense’-related strains CBWB and SLY and ‘ Phytoplasma mali’-related strain AP-AT. The overall density of SSRs in phytoplasma genomes was higher than in representative strains of other prokaryotes. While mono- and trinucleotide SSRs were significantly overrepresented in the phytoplasma genomes, dinucleotide SSRs and other higher-order SSRs were underrepresented. The occurrence and distribution of long SSRs in the prophage islands and phytoplasma-unique genetic loci indicated that SSRs played a role in compounding the complexity of sequence mosaics in individual genomes and in increasing allelic diversity among genomes. Findings from computational analyses were further complemented by an examination of SSRs in varied additional phytoplasma strains, with a focus on potential contingency genes. Some SSRs were located in regions that could profoundly alter the regulation of transcription and translation of affected genes and/or the composition of protein products.

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2015-08-01
2024-04-23
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Occurrence, distribution and possible functional roles of simple sequence repeats in phytoplasma genomes
Int J Syst Evol Microbiol 65, 2748 (2015); https://doi.org/10.1099/ijs.0.000273
/content/journal/ijsem/10.1099/ijs.0.000273
/content/journal/ijsem/10.1099/ijs.0.000273
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