Abstract
Theiler's virus causes a persistent infection and a demyelinating disease of mice which is a model for multiple sclerosis. Susceptibility to viral persistence maps to several loci, including the interferon gamma locus. Inactivating the gene coding for the interferon gamma receptor makes 129/Sv mice susceptible to persistent infection and clinical disease, whereas inactivating the interferon gamma gene makes C57BL/6 mice susceptible to persistent infection but not to clinical disease. This difference in phenotype is due to the difference in genetic background. Clinical disease depends on high viral load and Tmevd5, a locus on chromosome 11. These results have consequences for the identification of viruses which might be implicated in multiple sclerosis.
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