TY - JOUR T1 - The ingi and RIME non-LTR retrotransposons are not randomly distributed in the genome of Trypanosoma brucei. JF - Mol Biol Evol Y1 - 2004 A1 - Bringaud, Frederic A1 - Biteau, Nicolas A1 - Zuiderwijk, Eduard A1 - Berriman, Matthew A1 - El-Sayed, Najib M A1 - Ghedin, Elodie A1 - Melville, Sara E A1 - Hall, Neil A1 - Baltz, Théo KW - Amino Acid Sequence KW - Animals KW - Base Sequence KW - Consensus Sequence KW - Genome, Protozoan KW - Molecular Sequence Data KW - Retroelements KW - Sequence Analysis KW - Trypanosoma brucei brucei AB -

The ingi (long and autonomous) and RIME (short and nonautonomous) non--long-terminal repeat retrotransposons are the most abundant mobile elements characterized to date in the genome of the African trypanosome Trypanosoma brucei. These retrotransposons were thought to be randomly distributed, but a detailed and comprehensive analysis of their genomic distribution had not been performed until now. To address this question, we analyzed the ingi/RIME sequences and flanking sequences from the ongoing T. brucei genome sequencing project (TREU927/4 strain). Among the 81 ingi/RIME elements analyzed, 60% are complete, and 7% of the ingi elements (approximately 15 copies per haploid genome) appear to encode for their own transposition. The size of the direct repeat flanking the ingi/RIME retrotransposons is conserved (i.e., 12-bp), and a strong 11-bp consensus pattern precedes the 5'-direct repeat. The presence of a consensus pattern upstream of the retroelements was confirmed by the analysis of the base occurrence in 294 GSS containing 5'-adjacent ingi/RIME sequences. The conserved sequence is present upstream of ingis and RIMEs, suggesting that ingi-encoded enzymatic activities are used for retrotransposition of RIMEs, which are short nonautonomous retroelements. In conclusion, the ingi and RIME retroelements are not randomly distributed in the genome of T. brucei and are preceded by a conserved sequence, which may be the recognition site of the ingi-encoded endonuclease.

VL - 21 CP - 3 M3 - 10.1093/molbev/msh045 ER -