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Genetics, Vol 139, 387-395, Copyright © 1995
INVESTIGATIONS |
Identification of Hepatocarcinogen-Resistance Genes in DBA/2 Mice
G. H. Lee, L. M. Bennett, R. A. Carabeo and N. R. Drinkwater
Present address: Department of Pathology, Asahikawa Medical College, 4-5-3-11 Nishikagura, Asahikawa 078, Japan.
Male DBA/2J mice are ~20-fold more susceptible than male C57BL/6J mice to hepatocarcinogenesis induced by perinatal treatment with N,N-diethylnitrosamine (DEN). In order to elucidate the genetic control of hepatocarcinogenesis in DBA/2J mice, male BXD recombinant inbred, D2B6F(1) X B6 backcross, and D2B6F(2) intercross mice were treated at 12 days of age with DEN and liver tumors were enumerated at 32 weeks. Interestingly, the distribution of mean tumor multiplicities among BXD recombinant inbred strains indicated that hepatocarcinogen-sensitive DBA/2 mice carry multiple genes with opposing effects on the susceptibility to liver tumor induction. By analyzing D2B6F(1) X B6 backcross and D2B6F(2) intercross mice for their liver tumor multiplicity phenotypes and for their genotypes at simple sequence repeat marker loci, we mapped two resistance genes carried by DBA/2J mice, designated Hcr1 and -2, to chromosomes 4 and 10, respectively. Hcr1 and Hcr2 resolved the genetic variance in the backcross population well, indicating that these resistance loci are the major determinants of the variance in the backcross population. Although our collection of 100 simple sequence repeat markers allowed linkage analysis for ~95% of the genome, we failed to map any sensitivity alleles for DBA/2J mice. Thus, it is likely that the susceptibility of DBA/2J mice is the consequence of the combined effects of multiple sensitivity loci.
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