Journal
CURRENT OPINION IN MICROBIOLOGY
Volume 3, Issue 3, Pages 270-275Publisher
CURRENT BIOLOGY LTD
DOI: 10.1016/S1369-5274(00)00088-6
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Molecular phylogenetic studies reveal that many endosymbioses between bacteria and invertebrate hosts result from ancient infections followed by strict vertical transmission within host lineages, Endosymbionts display a distinctive constellation of genetic properties including AT-biased base composition, accelerated sequence evolution, and, at least sometimes, small genome size; these features suggest increased genetic drift. Molecular genetic characterization also has revealed adaptive, host-beneficial traits such as amplification of genes underlying nutrient provision.
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