Molecular Biology and Evolution, Vol 16, 208-217, Copyright © 1999 by Society for Molecular Biology and Evolution
Y Matsuoka and K Tsunewaki
The evolutionary dynamics of Ty1-copia group retrotransposons in grass were
examined by reverse transcriptase (RT) domain analysis. Twenty- three rice
RT sequences were newly determined for this report. Phylogenetic analysis
of 177 RT sequences, mostly derived from wheat, rice, and, maize, showed
four distinct families, which were designated G1, G2, G3, and G4. Three of
these families have elements obtained from distantly related species,
indicative of origins prior to the radiation of grass species. Results of
Southern hybridization and detailed comparisons between the wheat and rice
sequences indicated that each of the families had undergone a distinct
pattern of evolution. Multiple families appear to have evolved in parallel
in a host species. Analyses of synonymous and nonsynonymous substitutions
suggested that there is a low percentage of elements carrying functional RT
domains in the G4 family, indicating that the production of new G4 elements
has been controlled by a small number of elements carrying functional RT
domains.
ORIGINAL ARTICLE
Evolutionary dynamics of Ty1-copia group retrotransposons in grass shown by reverse transcriptase domain analysis
Department of Bioscience, Fukui Prefectural University, Japan. matsuoka@fpu.ac.jp
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