R2 dynamics in Triops cancriformis (Bosc, 1801) (Crustacea, Branchiopoda, Notostraca): turnover rate and 28S concerted evolution.

ABSTRACT: The R2 retrotransposon is here characterized in bisexual populations of the European crustacean Triops cancriformis. The isolated element matches well with the general aspects of the R2 family and it is highly differentiated from that of the congeneric North American Triops longicaudatus. The analysis of 5' truncations indicates that R2 dynamics in T. cancriformis populations show a high turnover rate as observed in Drosophila simulans. For the first time in the literature, though, individuals harboring truncation variants, but lacking the complete element, are found. Present results suggest that transposition-mediated deletion mechanisms, possibly involving genomic turnover processes acting on rDNAs, can dramatically decrease the copy number or even delete R2 from the ribosomal locus. The

SUBMITTER: Mingazzini V 

PROVIDER: S-EPMC3183910 | biostudies-literature | 2011 Apr

REPOSITORIES: biostudies-literature