A novel founder mutation in the MFN2 gene associated with variable Charcot–Marie–Tooth type 2 phenotype in two families from Southern Italy

Charcot–Marie–Tooth (CMT) disease is the most common hereditary neuropathy. CMT falls into two main forms: the demyelinating CMT type 1 with decreased nerve conduction velocities and the axonal CMT type 2. CMT2 is further subtyped by linkage analysis into >10 loci, with eight genes identified. Recently, mutations in the mitochondrial fusion protein 2 (MFN2) gene were reported in families with CMT2A1 and additional mutations have been detected in other studies, bringing to 42 the total number of different MFN2 mutations described thus far.2–4 In the current study, we report a novel MFN2 mutation shared by two apparently unrelated CMT2 families originating from the same area in Southern Italy.