A new clinical entity in T704M mutation in periodic paralysis.

Autor: Gun Bilgic D; Department of Medical Genetics, Manisa Celal Bayar University Medical Faculty, Manisa, Turkey. Electronic address: dilek.bilgic@cbu.edu.tr., Aydin Gumus A; Department of Medical Genetics, Manisa Celal Bayar University Medical Faculty, Manisa, Turkey., Gerik Celebi HB; Department of Medical Genetics, Balıkesir City Hospital, Balıkesir, Turkey., Bilgic A; Department of Orthopaedics and Traumatology, Manisa City Hospital, Manisa, Turkey., Unaltuna Erginel N; Department of Genetics, Aziz Sancar Institute of Experimental Medicine, Istanbul University, Turkey., Cam FS; Department of Medical Genetics, Manisa Celal Bayar University Medical Faculty, Manisa, Turkey.
Jazyk: angličtina
Zdroj: Journal of clinical neuroscience : official journal of the Neurosurgical Society of Australasia [J Clin Neurosci] 2020 Aug; Vol. 78, pp. 203-206. Date of Electronic Publication: 2020 Apr 23.
DOI: 10.1016/j.jocn.2020.04.061
Abstrakt: Periodic paralyses (PPs) are a group of rare disorders characterized by episodic, sudden-onset, flaccid paralysis of skeletal muscles usually resulting in complete recovery after the attacks. PPs are caused by abnormal, mostly potassium-sensitive excitability of the muscle tissue. Hypokalemic and hyperkalemic periodic paralysis (HypoKPP and HyperKPP) have been described according to their characteristic phenotypes and the serum potassium level during the attacks of weakness. The T704M mutation on the SCN4A gene is the most common mutation in HyperKPP. Different mutations of the SCN4A gene have also been reported in some cases of HypoKPP. In this study, a large Turkish family carrying the T704M mutation on the SCN4A gene with HypoKPP disease was examined. A similar history was noted in a total of 17 subjects in the pedigree. SCN4A gene of the patients was sequenced with Sanger sequencing. In this study, this mutation was associated with a HypoKKP diagnosis for the first time in the literature. The symptoms of hallucination and diplopia seen in patients had also never been indicated in the literature before. This report expands the phenotypic variability of the T704M mutation, further confirming the lack of genotype-phenotype correlation in SCN4A mutations.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2020 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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