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- W2022781361 abstract "Rex1, together with the related BABAR: elements, represents a new family of non-long-terminal-repeat (non-LTR) retrotransposons from fish, which might be related to the CR1 clade of LINE elements. Rex1/BABAR: retrotransposons encode a reverse transcriptase and an apurinic/apyrimidinic endonuclease, which is very frequently removed by incomplete reverse transcription. Different Rex1 elements show a conserved terminal 3' untranslated region followed by oligonucleotide tandem repeats of variable size and sequence. Phylogenetic analysis revealed that Rex1 retrotransposons were frequently active during fish evolution. They formed multiple ancient lineages, which underwent several independent and recent bursts of retrotransposition and invaded fish genomes with varying success (from <5 to 500 copies per haploid genome). At least three of these ancient Rex1 lineages were detected within the genome of poeciliids. One lineage is absent from some poeciliids but underwent successive rounds of retrotransposition in others, thereby increasing its copy number from <10 to about 200. At least three ancient Rex1 lineages were also detected in the genome project fish Fugu rubripes. Rex1 distribution within one of its major lineages is discontinuous: Rex1 was found in all Acanthopterygii (common ancestor in the main teleost lineage approximately 90 MYA) and in both European and Japanese eels (divergence from the main teleost lineage about 180 MYA) but not in trout, pike, carp, and zebrafish (divergence 100-120 MYA). This might either result from frequent loss or rapid divergence of Rex1 elements specifically in some fish lineages or represent one of the very rare examples of horizontal transfer of non-LTR retrotransposons. This analysis highlights the dynamics and complexity of retrotransposon evolution and the variability of the impact of retrotransposons on vertebrate genomes." @default.
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- W2022781361 date "2000-11-01" @default.
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- W2022781361 title "Multiple Lineages of the Non-LTR Retrotransposon Rex1 with Varying Success in Invading Fish Genomes" @default.
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- W2022781361 doi "https://doi.org/10.1093/oxfordjournals.molbev.a026266" @default.
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