Evolution of the Leucine Gene Cluster in Buchnera aphidicola: Insights from Chromosomal Versions of the Cluster
AUTOR(ES)
Sabater-Muñoz, Beatriz
FONTE
American Society for Microbiology
RESUMO
In Buchnera aphidicola strains associated with the aphid subfamilies Thelaxinae, Lachninae, Pterocommatinae, and Aphidinae, the four leucine genes (leuA, -B, -C, and -D) are located on a plasmid. However, these genes are located on the main chromosome in B. aphidicola strains associated with the subfamilies Pemphiginae and Chaitophorinae. The sequence of the chromosomal fragment containing the leucine cluster and flanking genes has different positions in the chromosome in B. aphidicola strains associated with three tribes of the subfamily Pemphiginae and one tribe of the subfamily Chaitophorinae. Due to the extreme gene order conservation of the B. aphidicola genomes, the variability in the position of the leucine cluster in the chromosome may be interpreted as resulting from independent insertions from an ancestral plasmid-borne leucine gene. These findings do not support a chromosomal origin for the leucine genes in the ancestral B. aphidicola and do support a back transfer evolutionary scenario from a plasmid to the main chromosome.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=387811Documentos Relacionados
- Reductive genome evolution in Buchnera aphidicola
- Postsymbiotic plasmid acquisition and evolution of the repA1-replicon in Buchnera aphidicola
- Putative evolutionary origin of plasmids carrying the genes involved in leucine biosynthesis in Buchnera aphidicola (endosymbiont of aphids).
- The process of genome shrinkage in the obligate symbiont Buchnera aphidicola
- Plasmid-Encoded Anthranilate Synthase (TrpEG) in Buchnera aphidicola from Aphids of the Family Pemphigidae