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Front Microbiol. 2013 Aug 14;4:230. doi: 10.3389/fmicb.2013.00230. eCollection 2013.

Genomic and evolutionary aspects of phytoplasmas.

Frontiers in microbiology

Kenro Oshima, Kensaku Maejima, Shigetou Namba

Affiliations

  1. Department of Agricultural and Environmental Biology, Graduate School of Agricultural and Life Sciences, The University of Tokyo Yayoi, Bunkyo-ku, Tokyo, Japan.

PMID: 23966988 PMCID: PMC3743221 DOI: 10.3389/fmicb.2013.00230

Abstract

Parasitic bacteria that infect eukaryotes, such as animals and plants, often have reduced genomes, having lost important metabolic genes as a result of their host-dependent life cycles. Genomic sequencing of these bacteria has revealed their survival strategies and adaptations to parasitism. Phytoplasmas (class Mollicutes, genus 'Candidatus Phytoplasma') are intracellular bacterial pathogens of plants and insects and cause devastating yield losses in diverse low- and high-value crops worldwide. The complete genomic sequences of four Candidatus Phytoplasma species have been reported. The genomes encode even fewer metabolic functions than other bacterial genomes do, which may be the result of reductive evolution as a consequence of their life as an intracellular parasite. This review summarizes current knowledge of the diversity and common features of phytoplasma genomes, including the factors responsible for pathogenicity.

Keywords: ATP synthase; genome; mycoplasma; phytoplasma; reductive evolution; secreted protein; virulence factor

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