期刊
MICROBIOLOGY-SGM
卷 148, 期 -, 页码 2551-2556出版社
MICROBIOLOGY SOC
DOI: 10.1099/00221287-148-8-2551
关键词
genome reduction; symbiosis; bacteriocytes; asexuality; genetic drift
类别
资金
- NIGMS NIH HHS [R01 GM62626-01] Funding Source: Medline
Blochmannia (Candidatus Blochmannia gen. nov.) is the primary bacterialendosymbiont 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 estimate 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 mutuallists may reflect irreversible specialization to a host cellular environment.
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