PMP22 and Charcot-Marie-Tooth disease type 1A: miR-4731 is located at chr17p12 (chr17:15,154,944-15,155,013) in an intron (>5 kb from intron-exon border) of the peripheral myelin protein 22 gene (PMP22), which is commonly associated with hereditary Charcot-Marie-Tooth disease type 1A (CMT1A).