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. 2017 Mar 13;7:44450. doi: 10.1038/srep44450

Figure 6. Localization of a hearing loss modifier in the 129S1.B6-Cdh23ahl congenic region.

Figure 6

(A) Average 16 kHz ABR thresholds (±standard deviations) of 3-month-old 129 S1 inbred strain mice (N = 10), 129S1.B6-Cdh23ahlcongenic mice (Congenic; N = 10), 129S-Cdh23c.753A mice (SNV; N = 19), and (Congenic × SNV) F1 hybrids (N = 6). (B) Frequency distribution of 16 kHz ABR thresholds among 3-month-old N2 mice (N = 182) from a backcross of (129S-Cdh23c.753A SNV × 129S1.B6-Cdh23ahl congenic) F1 hybrids with 129S-Cdh23c.753A SNV mice. The threshold ranges and averages of age-matched parental strain mice (F1 hybrids, SNV mice) are indicated at the top of the figure as horizontal gray lines. N2 mice with homozygous and heterozygous Mahl genotypes are distinguished by red and blue colors. (C) Chr 10 haplotype analysis of N2 mice. SNP markers and their Mb positions along Chr 10 are shown above the corresponding genotypes of parental strain and N2 backcross mice. Haplotypes C and D contain crossovers within the congenic region, and the correlations of ABR thresholds with SNP genotypes further refine the candidate region of the modifier locus (designated Mahl). The 129S1.B6-Cdh23ahlcongenic region and the Mahl candidate gene region are indicated by dotted lines. The non-recombinant rs13480621 and Cdh23c.753A markers were used to assign Mahl genotypes in panel B above. Allele designations: B, C57BL/6-derived; S, 129S1-derived; S*, 129S1-derived with targeted Cdh23c.753G>A substitution.