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  • Title: Reverse-transcribed pseudogenes of U1 small nuclear RNA presumably amplified in the rat genome together with the flanking region.
    Author: Watanabe-Nagasu N, Satoh H, Ohshima Y.
    Journal: Gene; 1987; 52(2-3):235-43. PubMed ID: 3038687.
    Abstract:
    We have examined 25 independent rat genomic clones each of which contains a U1 RNA gene or a pseudogene. We have found five clones whose restriction maps are identical with or overlapping one another. These clones contain sequences which are co-linear with that of U1 RNA except for one or two nucleotides (nt). They also contain 21-23-nt poly(A) stretches immediately after U1 RNA homology. In addition, the U1 RNA-poly(A) regions are surrounded by the same direct repeat sequences. Therefore, they seem to be pseudogenes which have been generated by the reverse transcription of poly(A)-tailed U1 RNA followed by the insertion of the transcript into the genome. Furthermore, conservation of the sequences extends over at least 18 kb of the flanking sequences. This suggests a family of conserved reverse-transcribed pseudogenes, which implies amplification of an original pseudogene. It is also suggested that the target sequence without insertion of a U1 RNA sequence has been amplified. The mechanisms for the amplification and sequence conservation are discussed.
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