PMP22 and Charcot-Marie-Tooth disease type 1A: A Czech patient had a phenotype caused by the combination of a point mutation in the DMD gene and a duplication of the PMP22 gene causing CMT1A (Charcot-Marie-Tooth disease type 1A) [16], and a Chinese patient had a phenotype caused by a duplication of the PMP22 gene and a DMD deletion [17].