Analysis of nucleotide sequences of bacterial retrointrons for the presence of homology to eukaryotic MGE

Aims. To analyze the sequences of bacterial retrointrons for the presence of homology to representatives of various classes of eukaryotic mobile genetic elements (MGE). Methods. Nucleotide sequences of bacterial group II introns were taken for analysis from the Database for Bacterial Group II Introns. The results of the search and identification of MGE have been realized by CENSOR program. Results. In the analyzed sequences of bacterial retrointrons, fragments of sequences of both classes of eukaryotic MGEs were found in various combinations: non-LTR; LTR; DNA; non-LTR+LTR; non-LTR+DNA; LTR+DNA; non-LTR+LTR+DNA. The largest group of retrointrons contains MGEs of various classes. Conclusions. Bacterial retrointrons can be not only ancestors of non-LTR retroelements, but also carriers of fragmentary nucleotide sequences for the formation of various eukaryotic MGEs.