Short interspersed repetitive elements (SINEs) are widely distributed among the genomes of eukaryotes. We proposed previously that a SINE should be defined by the presence of a region homologous to a tRNA or to 7SL RNA, together with A-box and B-box promoter sequences, in order to distinguish SINEs from other short repetitive sequences, such as short segments of LINEs (long interspersed repetitive elements; Okada et al. Gene 205, 229–243, 1997). Numerous SINE sequences have been deposited to date in DNA databases. In some cases, however, designation of a particular sequence is problematic when the short repetitive sequence has been defined as a SINE without reference to the presence or absence of promoter elements specific for RNA polymerase III. We demonstrate here that four different sequences, namely, ARE1p, ARE2p, CetSINE1, and CetSINE2, each of which has been reported as a SINE, are, in fact, only partial sequences of members of a new subfamily of L1. We also demonstrate that members of this subfamily are distributed specifically among the genomes of cetartiodactyls.
Mammalian Genome – Springer Journals
Published: Dec 1, 2000
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