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The mouse genomic locus containing the oncogene c-mos was analyzed for repetitive DNA sequences. We found a single B1 repeat 10 kb upstream and three B1 repeats 0.6 kb, 2.7 kb, and 5.4 kb, respectively, downstream from c-mos. The B1 repeat closest to c-mos contains an internal 7-bp duplication and a 18-bp insertion. Localized between the last two B1 repeats is a copy of a novel mouse repeat. Sequence comparison of three copies of this novel repeat family shows that they a) contain a conserved BglII site, b) are approximately 420 bp long, c) possess internal 50-bp polypurine tracts, and d) have structural characteristics of transposable elements. They are present in about 1500 copies per haploid genome in the mouse, but are not detectable in DNA of other mammals. The BglII repeat downstream from c-mos is interrupted by a single 632-bp LTR element. We estimate that approximately 1200 copies of this element are present per haploid genome in BALB/c mice. It shares sequence homology in the R-U5 region with an LTR element found in 129/J mice.

A novel transposon-like repeal interrupted by an LTR element occurs in a cluster of Bl repeats in the mouse c-moslocus