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At least three genes from C57BL/6 mice that mediate dominant resistance to lethal mousepox were isolated and transferred onto a susceptible DBA/2 background. Three [(C57BL/6 x DBA/2)F1 x DBA/2] male mice that survived infection were selected as founders on the basis of different complements of marker loci for two resistance genes, Rmp-2r (Hc1) and Rmp-3r (H-2Db). They were crossed with DBA/2 mice, male progeny were infected with ectromelia virus, and the cycle was repeated with surviving male progeny through seven backcross generations. Two founders carried a marker locus for Rmp-2r or Rmp-3r, and the third carried neither marker locus. Resistance pedigrees were analyzed for passage of marker loci. From the three founders, resistance was passaged through multiple generations, producing backcross lines with intermediate-male-resistance phenotypes (20% resistant). Females of backcross lines with intermediate male resistance had high resistance (&gt; 50%). High-resistance backcross lines (40% male resistance) also developed from the founders that carried marker loci for Rmp-2r and Rmp-3r, and marker loci were passaged through all generations of high resistance but not intermediate-resistance lines. About one-third of all resistant mice in high-resistance lines sired by mice that carried marker loci for Rmp-2r and Rmp-3r did not carry the respective marker locus. In lines that carried Rmp-2r, this was apparently not the result of recombination between Rmp-2r and Hc1, because Rmp-2 was not in the predicted location on chromosome 2 and because mice that did not inherit Hc1 transmitted significantly less male resistance than Hc1-positive mice, although female resistance remained high. These results confirmed that C57BL/6 mice have redundant resistance mechanisms, two of which are controlled at least in part by Rmp-2r and Rmp-3r, and provided evidence for a fourth resistance gene, herein presumptively named Rmp-4, which protects females more than males and which may be epistatic to Rmp-2.

Serial backcross analysis of genetic resistance to mousepox, using marker loci for Rmp-2 and Rmp-3