Balkan Journal of Medical Genetics

A NOVEL c.973G>T MUTATION IN THE ε-SUBUNIT OF THE ACETYLCHOLINE RECEPTOR CAUSING CONGENITAL MYASTHENIC SYNDROME IN AN IRANIAN FAMILY
Karimzadeh P1,2, Parvizi Omran S3, Ghaedi H4, Omrani MD4,*
*Corresponding Author: Mir Davood Omrani, Ph.D., Department of Medical Genetics, Faculty of Medicine, Shahid Beheshti University of Medical Sciences, Koodakyar Street, Daneshjoo Boulevard, Evin, Chamran Highway, Tehran, Islamic Republic of Iran, 1985717443. E-mail: davood_omrani@sbmu.ac.ir
page: 95
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Abstract

Congenital myasthenic syndrome (CMS) constitutes a group of inherited disorders of neuromuscular junctions. The majority of postsynaptic syndromes result from mutations in the CHRNE gene that causes muscle nicotine acetylcholine deficiency. In this study, we report on a 2 and a half-yearold boy with normal developmental milestones and bilateral ptosis. Clinical courses, electrophysiological studies and molecular genetic analysis were assessed. Polymerase chain reaction (PCR) and direct DNA sequencing of the CHRNE gene were performed for the proband and all the family members. A novel homozygous missense mutation of c.973G>T was found in the CHRNE gene. Segregation studies were suggested to be the genetic cause of the disease. Using three in silico tools and the American College of Medical Genetics and Genomics/Association for Molecular Pathology (ACMG/AMP) variant classification guidelines indicated that the novel variant c.973G>T was likely pathogenic. Our results recommended first screening of the CHRNE gene for pathogenic mutations in Iranian origin.

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