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Endogenous retrovirus-like sequences homologous to intracisternal type-A particle (IAP) genes, which are present in the inbred mouse (Mus musculus) genome, were cloned from a Syrian hamster gene library. A typical hamster IAP gene was 7 kb long and segments homologous to long terminal repeat (IAP) sequences present in Mus musculus IAP genes were located at both ends of the gene. Contrary to the pattern found in the Mus musculus IAP genes, the organization of the cloned hamster IAP genes was not markedly polymorphic and deletion was not observed among these cloned genes. A sequence about 0.8 kb long and located close to the 3' end of the hamster IAP gene was well conserved in both IAP gene families, although they showed less overall homology with one another. The reiteration frequency of the hamster IAP genes was calculated to be 950 copies per haploid genome. Since such IAP genes with the above properties were not found in the genome of the Chinese hamster, whose progenitors diverged from those of the Syrian hamster about 7.5 Myr ago, the integration of a huge number of Syrian hamster IAP genes must have occurred subsequent to such divergence.

Molecular cloning of retrovirus-like genes present in multiple copies in the Syrian hamster genome