MFN2 and neuropathy: Genes associated with Charcot–Marie–Tooth disease (MPZ, MFN2, and GJB1) were sequenced also, as Charcot–Marie–Tooth disease presents with progressive atrophy and muscle weakness secondary to neuropathy (Roa et al. 1996; Züchner et al. 2004; Rouzier et al. 2012).