期刊
JOURNAL OF THE PERIPHERAL NERVOUS SYSTEM
卷 21, 期 1, 页码 45-51出版社
WILEY-BLACKWELL
DOI: 10.1111/jns.12160
关键词
bisulphite sequencing; CMTX6; neuropathy; pyruvate dehydrogenase kinase isoenzyme 3 (PDK3); whole-exome sequencing (WES)
资金
- Korean Health Technology R&D Project, Ministry of Health & Welfare, Republic of Korea [HI12C0135, HI14C3484]
- National Research Foundation of Korea (NRF) - Korean Government, MSIP [NRF-2014R1A2A2A01004240]
- Australian National Health and Medical Research Project [APP104668]
Charcot-Marie-Tooth disease (CMT) is the most common inherited peripheral neuropathy. Mutations in the pyruvate dehydrogenase kinase isoenzyme 3 (PDK3) gene have been found to cause X-linked dominant CMT type 6 (CMTX6). This study identified the p.R158HPDK3 mutation after screening 67 probable X-linked CMT families. The mutation fully segregated with the phenotype, and genotyping the family indicated the mutation arose on a different haplotype compared with the original Australian CMTX6 family. Results of bisulphite sequencing suggest that methylated deamination of a CpG dinucleotide may cause the recurrent p.R158H mutation. The frequency of the p.R158HPDK3 mutation in Koreans is very rare. Magnetic resonance imaging revealed fatty infiltration involving distal muscles in the lower extremities. In addition, fatty infiltrations were predominantly observed in the soleus muscles, with a lesser extent in tibialis anterior muscles. This differs from demyelinating CMT1A patients and is similar to axonal CMT2A patients. The clinical, neuroimaging, and electrophysiological findings from a second CMTX6 family with the p.R158HPDK3 mutation were similar to the axonal neuropathy reported in the Australian family.
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