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    J Bacteriol. 2001 Jan;183(2):785-90.

    Vertical transmission of biosynthetic plasmids in aphid endosymbionts (Buchnera).

    Wernegreen JJ, Moran NA.

    Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, Arizona 85721, USA. jwernegreen@mbl.edu

    This study tested for horizontal transfer of plasmids among Buchnera aphidicola strains associated with ecologically and phylogenetically related aphid hosts (Uroleucon species). Phylogenetic congruence of Buchnera plasmid (trpEG and leuABC) and chromosomal (dnaN and trpB) genes supports strictly vertical long-term transmission of plasmids, which persist due to their contributions to host nutrition rather than capacity for infectious transfer. Synonymous divergences indicate elevated mutation on plasmids relative to chromosomal genes.

    PMID: 11133977 [PubMed - indexed for MEDLINE]

    PMCID: 94939

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