Turkish Neurosurgery 2021 , Vol 31 , Num 6
The Importance of Multiple Gene Analysis for Diagnosis and Differential Diagnosis in Charcot Marie Tooth Disease
Sinem YALCINTEPE1,Hakan GURKAN1,Ipek GUNGOR DOGAN2,Selma DEMIR1,Sebnem OZEMRI SAG3,Zehra MANAV KABAYEGIT4,Emine Ikbal ATLI1,Engin ATLI1,Damla EKER1,Sehime Gulsun TEMEL3
1Trakya University, Faculty of Medicine, Department of Medical Genetics, Edirne, Turkey
2Trakya University, Faculty of Medicine, Department of Neurology, Edirne, Turkey
3Bursa Uludag University, Faculty of Medicine, Department of Medical Genetics, Bursa, Turkey
4Aydin Adnan Menderes University, Faculty of Medicine, Department of Medical Genetics, Aydin, Turkey
DOI : 10.5137/1019-5149.JTN.33661-21.3 AIM: To investigate the genetic etiology of Charcot-Marie-Tooth (CMT) disease or hereditary motor and sensory neuropathy (HMSN).

MATERIAL and METHODS: We herein examined 55 non-related patients with a suspicion of CMT phenotype or HMSN using a customized multigene panel based on the next-generation sequencing technique. All cases were previously analyzed for PMP22 duplication with the Multiplex Ligand Probe Amplification (MLPA) method.

RESULTS: In 13 cases (7.15%), we identified a pathogenic/likely pathogenic variant. The affected genes were MARS1, NDRG1, GJB1, GDAP1, MFN2, PRX, SH3TC2, and FGD4. In six cases (10.9%), novel variants were identified: pathogenic variants in GJB1 and FGD4 genes, variants of unknown significance (VUS) in HSPB3, CHRNA1, ARHGEF10, and KIF5A genes. In 21 cases (11.55%), VUS with the genes HSPB3, KIF1B, SCN11A, CHRNA1, HSPB1, FIG4, ARHGEF10, DHTKD1, SBF1, EGR2, SBF2, IGHMBP2, KIF5A, and DNAJB2 were identified.

CONCLUSION: In this study, we had a 7.15% diagnosis rate with the NGS (Next Generation Sequencing) method in the CMT disease. Targeted next-generation sequencing panels are beneficial, time-saving, and cost-effective in the diagnosis of CMT. Keywords : Charcot-marie-tooth, Next generation sequencing, Multigene testing, Hereditary neuropathy

Corresponding author : Sinem YALCINTEPE, sinemyalcintepe@gmail.com