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Identification of Genetic Causes of Inherited Peripheral Neuropathies by Targeted Gene Panel Sequencing

  • Nam, Soo Hyun (Department of Biological Sciences, Kongju National University) ;
  • Hong, Young Bin (Stem Cell & Regenerative Medicine Center and Neuroscience Center, Samsung Medical Center) ;
  • Hyun, Young Se (Department of Biological Sciences, Kongju National University) ;
  • Nam, Da Eun (Department of Biological Sciences, Kongju National University) ;
  • Kwak, Geon (Department of Neurology, Sungkyunkwan University School of Medicine) ;
  • Hwang, Sun Hee (Department of Neurology, Sungkyunkwan University School of Medicine) ;
  • Choi, Byung-Ok (Stem Cell & Regenerative Medicine Center and Neuroscience Center, Samsung Medical Center) ;
  • Chung, Ki Wha (Department of Biological Sciences, Kongju National University)
  • Received : 2015.10.20
  • Accepted : 2016.02.22
  • Published : 2016.05.31

Abstract

Inherited peripheral neuropathies (IPN), which are a group of clinically and genetically heterogeneous peripheral nerve disorders including Charcot-Marie-Tooth disease (CMT), exhibit progressive degeneration of muscles in the extremities and loss of sensory function. Over 70 genes have been reported as genetic causatives and the number is still growing. We prepared a targeted gene panel for IPN diagnosis based on next generation sequencing (NGS). The gene panel was designed to detect mutations in 73 genes reported to be genetic causes of IPN or related peripheral neuropathies, and to detect duplication of the chromosome 17p12 region, the major genetic cause of CMT1A. We applied the gene panel to 115 samples from 63 non-CMT1A families, and isolated 15 pathogenic or likelypathogenic mutations in eight genes from 25 patients (17 families). Of them, eight mutations were unreported variants. Of particular interest, this study revealed several very rare mutations in the SPTLC2, DCTN1, and MARS genes. In addition, the effectiveness of the detection of CMT1A was confirmed by comparing five 17p12-nonduplicated controls and 15 CMT1A cases. In conclusion, we developed a gene panel for one step genetic diagnosis of IPN. It seems that its time- and cost-effectiveness are superior to previous tiered-genetic diagnosis algorithms, and it could be applied as a genetic diagnostic system for inherited peripheral neuropathies.

Keywords

charcot-Marie-Tooth disease (CMT);DCTN1;gene panel;inherited peripheral neuropathy;MARS;SPTLC2

Acknowledgement

Supported by : National Research Foundation

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