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Studies of genetic resistance to flavivirus infection in laboratory mice have led to the development of a single model in which resistance is conferred by an autosomal dominant gene designated Flvr. Because of evidence suggesting that wild mice carry virus resistance genes which are not present in laboratory mice, we compared flavivirus resistance in the inbred strains CASA/Rk, CAST/Ei, and MOLD/Rk, which are derived directly from wild mice, and the congenic strains C3H/RV (Flvr/Flvr) and C3H/HeJ (Flvs/Flvs). Resistance to the Murray Valley encephalitis virus strain OR2 and the 17D vaccine strain of yellow fever virus was assessed by determining the lethality of intracerebral infection and by measuring virus replication in the brain. The resistance of the CASA/Rk and CAST/Ei strains resembled the resistance of C3H/RV mice, whereas the resistance of the MOLD/Rk strain was intermediate between those of C3H/RV and C3H/HeJ mice. Genetic analyses showed that resistance in both the CASA/Rk and MOLD/Rk strains is conferred by single autosomal dominant alleles at the Flv locus. Our data indicate that flavivirus resistance in the CASA/Rk strain is due to a gene which is similar or identical to Flvr, whereas resistance in the MOLD/Rk strain is due to a previously undescribed gene which we designate Flvmr to indicate minor resistance to flavivirus infection. Since genetic resistance to flaviviruses is rare in laboratory mice, the CASA/Rk and MOLD/Rk strains will be valuable for further investigation of this phenomenon.

journal of virology

Genetic studies of flavivirus resistance in inbred strains derived from wild mice: evidence for a new resistance allele at the flavivirus resistance locus (Flv)