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We isolated DNA clones of intracisternal A-particle (IAP) genes from the genome of an Asian wild mouse, Mus caroli. A typical M. caroli IAP gene was 6.5 kilobase pairs in length and had long terminal repeat (LTR) sequences at both ends. The size of the LTR was 345 base pairs in clone L20, and two LTRs at both ends of this clone were linked to directly repeating cellular sequences of 6 base pairs. Each LTR possessed most of the structural features commonly associated with the retrovirus LTR. The restriction map of the M. caroli IAP gene resembled that of Mus musculus, although the M. caroli IAP gene was 0.4 kilobase pairs shorter than the M. musculus IAP gene in two regions. Sequence homology between the M. caroli and M. musculus IAP LTRs was calculated as about 80%, whereas the LTR sequence of the Syrian hamster IAP gene was about 60% homologous to the M. caroli LTR. The reiteration frequency of the M. caroli IAP genes was estimated as 200 to 400 copies per haploid genome, which is at least 10 times the reported value. These results suggest that the IAP genes observed in the genus Mus are present in multiple copies with structures closely resembling the integrated retrovirus gene.

Molecular cloning and long terminal repeat sequences of intracisternal A-particle genes in Mus caroli