Compound heterozygous PMP22 deletion mutations causing severe Charcot–Marie–Tooth disease type 1

We present a 31/3-year-old girl with severe Charcot–Marie–Tooth disease type 1 (Dejerine–Sottas disease), who was a compound heterozygote carrying a deletion of the whole peripheral myelin protein 22 ( PMP22 ) and a deletion of exon 5 in the other PMP22 allele. Haplotype analyses and sequence determination revealed a 11.2 kb deletion spanning from intron 4 to 3′-region of PMP22 , which was likely generated by nonhomologous end joining. Severely affected patients carrying a PMP22 deletion must be analyzed for the mutations of the other copy of PMP22.