Using cosmid vector, a gene library of German cockroach Blattella germanica was constructed. From this library, clones containing full-length copies of two subfamilies of R1 retroposons were selected. Retroposons R1 of German cockroach belonging to different subfamilies were shown to be different in domain organization of the ORF2 C-terminal region. For the first time, retroposons transmembrane domains were identified in the sequences of R1. It was demonstrated that two retroposon R1 subfamilies of German cockroach arose as a result of intragenomic divergence rather than via horizontal transfer of alien mobile element into cockroach genome. The differences in domain organization appeared not as a result of saltatory recombination processes, but as a consequence of gradual mutation accumulation, which led to either degeneration, or to domain formation.
Russian Journal of Genetics – Springer Journals
Published: Aug 17, 2010
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