Small genome of Candidatus Blochmannia, the bacterial endosymbiont of Camponotus, implies irreversible specialization to an intracellular lifestyle

J. J. Wernegreen, A. B. Lazarus, P. H. Degnan

Research output: Contribution to journalArticlepeer-review

Abstract

Blochmannia (Candidatus Blochmannia gen. nov.) is the primary bacterial endosymbiont of the ant genus Camponotus. Like other obligate endosymbionts of insects, Blochmannia occurs exclusively within eukaryotic cells and has experienced long-term vertical transmission through host lineages. In this study, PFGE was used to estimates the genome size of Blochmannia as approximately 800 kb, which is significantly smaller than its free-living relatives in the enterobacteria. This small genome implies that Blochmannia has deleted most of the genetic machinery of related free-living bacteria. Due to restricted gene exchange in obligate endosymbionts, the substantial gene loss in Blochmannia and other insect mutualists may reflect irreversible specialization to a host cellular environment.

Original languageEnglish (US)
Pages (from-to)2551-2556
Number of pages6
JournalMicrobiology
Volume148
Issue number8
DOIs
StatePublished - Aug 2002

Keywords

  • Asexuality
  • Bacteriocytes
  • Genetic drift
  • Genome reduction
  • Symbiosis

ASJC Scopus subject areas

  • Microbiology

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