Experiment
Several F2 crosses between inbred strain O20/A and recombinant congenic strains OcB-3/Dem, OcB-4/Dem, OcB-6/Dem, OcB-9/Dem, and OcB-16/Dem were used to map QTLs linked to lung tumor susceptibility. Parental strain O20/A and OcB-4/Dem are susceptible to lung tumor development after ENU treatment whereas parental strains OcB-3/Dem, OcB-6/Dem, OcB-9/Dem, and OcB-16/Dem are relatively resistant. 14 previously identified lung tumor susceptibility loci were detected in these crosses (Sluc1-Sluc14) and 16 new loci were identified with a statistical significance of P>0.05. All of the QTL were detected in pairwise interactions, Table 1, Fig 1.
In the (OcB4 x O20/A)F2 cross newly identified QTL Sluc18 mapped to mouse Chr 4 in linkage with D4Mit4 at approximately 12.1 cM.
In the (OcB16 x O20/A)F2 cross newly identified QTL Sluc21 mapped to mouse Chr 4 in linkage with D4Mit70 at approximately 62.3 cM.