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Previous studies have shown that serum interferon (IFN) production in mice is quantitatively influenced by If loci, whose alleles determine high or low production. Although different loci influence IFN production in response to different inducers, such as Newcastle disease virus, Sendai virus, herpes simplex virus type 1, and polyriboinosinic-polyribocytidylic acid, BALB/c mice are in every instance low producers. It was therefore possible that, in addition to If loci, some feature of the BALB/c structural IFN genes contributed to low production. This was examined in the present work, in which IFN production was measured in two strains of C57BL/6 mice congenic with BALB/c at the murine alpha IFN (IFN-alpha) gene cluster on chromosome 4. One line, HW13 (B6.C-H-15c-H-16c-H-20c-H-21c/By) has a BALB/c fragment on chromosome 4 of at least 35 centimorgans which includes the BALB/c IFN-alpha gene cluster and four loci of the brown histocompatibility complex; the other line, HW13J (B6.C-H-15c/By), has a much shorter fragment (about 15 centimorgans), but it also comprises the BALB/c IFN-alpha gene cluster. We show that these mice, carrying the BALB/c IFN-alpha structural genes on a C57BL/6 background, are high IFN producers when stimulated by Newcastle disease virus, Sendai virus, herpes simplex virus type 1, or polyriboinosinic-polyribocytidylic acid. Thus, the low IFN production of BALB/c mice is not directly due to some feature of the IFN-alpha structural genes but is mainly the result of different alleles at If loci.

journal of virology

Interferon structural genes do not participate in quantitative regulation of interferon production by If loci as shown in C57BL/6 mice that are congenic with BALB/c mice at the alpha interferon gene cluster