GJB1 and Charcot-Marie-Tooth disease: DiVincenzo et al. described the frequency, detection rate, and mutation types in 14 representative genes (PMP22, GJB1, MPZ, MFN2, SH3TC2, GDAP1, NEFL, LITAF, GARS, HSPB1, FIG4, EGR2, PRX, and RAB7A) related to CMT in a cohort study of 17,880 patients tested in a commercial genetic laboratory.