[A new rodent short retrotransposon B1-dID. Un nouveau court retroptransposon de rongeur, B1-dID].

Résumé

Copies of unusually short retrotransposon were isolated from Dryomys nitedula, Marmota caudata, and Menetes berdmorei genomes. Similarly to primate Alu-element, the retrotransposon consists of two parts (monomers) but, as opposed to Alu-element, only the left B1-like monomer originated from 7SL RNA but the right monomer is similar to rodent ID element belonging to the class or tRNA-related retrotransposons. There are several structural elements of the new retrotransposon called B1-dID, some of them were found also in Castoridae genomes, and very few copies were found in guinea pig (Caviidae) and porcupine (Hystricidae) genomes. Evolution of these retrotransposons and rodents was discussed on the basis of nucleotide sequence analysis.