Moran Nancy A.

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Moran
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Nancy A.
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  • Article
    Vertical transmission of biosynthetic plasmids in aphid endosymbionts (Buchnera)
    (American Society for Microbiology, 2001-01) Wernegreen, Jennifer J. ; Moran, Nancy A.
    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.
  • Article
    Decoupling of genome size and sequence divergence in a symbiotic bacterium
    (American Society for Microbiology, 2000-07) Wernegreen, Jennifer J. ; Ochman, Howard ; Jones, Isaac B. ; Moran, Nancy A.
    In contrast to genome size variation in most bacterial taxa, the small genome size of Buchnera sp. was shown to be highly conserved across genetically diverse isolates (630 to 643 kb). This exceptional size conservation may reflect the inability of this obligate mutualist to acquire foreign DNA and reduced selection for genetic novelty within a static intracellular environment.