Gene structure of the murine 2'-5'-oligoadenylate synthetase family.

The 2'-5'-oligoadenylate synthetases (OASs) are members of a family of interferon-induced proteins playing an important role in the antiviral effect of interferons as well as being involved in apoptosis and control of cellular growth. Based on sequence data from the murine BAC clone (RP23-39M18), and a number of EST and IMAGE clones and the Celera Mouse database, we identified twelve Oas genes in the mouse genome, all localized to the chromosome 5F region. In contrast to the single OAS1 gene found in humans, we identified eight closely linked Oas1 genes in the murine genome, together with the genes of Oas2 and Oas3. Compared to the single OASL gene found in humans, two genes of OAS-like proteins, Oasl1 and Oasl2, were identified. All the putative genes seem to be transcribed. The exon/intron structures of the murine Oas genes were found to be identical to those of the human genes.