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Molecular Biology and Evolution, Vol 15, 1123-1134, Copyright © 1998 by Society for Molecular Biology and Evolution

ORIGINAL ARTICLE

The RTE class of non-LTR retrotransposons is widely distributed in animals and is the origin of many SINEs

HS Malik and TH Eickbush
Department of Biology, University of Rochester, New York 14627, USA.

RTE-1 is a non-long-terminal-repeat (non-LTR) retrotransposable element first found in the Caenorhabditis elegans genome. It encodes a 1,024- amino-acid open reading frame (ORF) containing both apurinic-apyrimidic endonuclease and reverse-transcriptase domains. A possible first ORF of only 43 amino acids overlaps with the larger ORF and may be the site of translation initiation. Database searches and phylogenetic analysis indicate that representatives of the RTE clade of non-LTR retrotransposons are found in the bovine and sheep genomes of mammals and in the silkmoth and mosquito genomes of insects. In addition, the previously identified SINEs, Art2 and Pst, from ruminate and viper genomes are shown to be truncated RTE-like retrotransposable elements. RTE-derived SINE elements are also found in mollusc and flatworm genomes. Members of the RTE clade are characterized by unusually short 3' untranslated regions that are predominantly composed of AT-rich trimer, tetramer, and/or pentamer repeats. This study establishes RTE as a very widespread clade of non-LTR retrotransposons. RTE represents the third distinct class of non-LTR retrotransposons in the vertebrate lineage (after Line 1 elements in mammals and CR1 elements in birds and reptiles).
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