FGF13 and diabetic neuropathy: Of seven rare variants in the SCN9A gene and one in the FGF13 (Figure 8D and Supplemental Table 11) meeting these criteria, the V1831F variant (NM_001365536.1 2:167055658_C/A c.5491G>T) in the SCN9A gene found in a painless diabetic neuropathy patient was particularly relevant.