Intractable & Rare Diseases Research
Online ISSN : 2186-361X
Print ISSN : 2186-3644
ISSN-L : 2186-3644
Letter
Mild congenital myopathy due to a novel variation in SPEG gene
Mirac YildirimOzgur BalasarEngin KoseMelih Timucin Dogan
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2021 Volume 10 Issue 3 Pages 220-222

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Abstract

Centronuclear myopathies (CNMs) are a subgroup of congenital myopathies (CMs) characterized by muscle weakness, genetic heterogeneity, and predominant type 1 fibers and increased central nuclei in muscle biopsy. Mutations in CNM-causing genes such as MTM1, DNM2, BIN1, RYR1, CACNA1S, TTN, and extraordinary rarely SPEG (striated muscle preferentially expressed protein kinase) have been identified for about 60-80% of patients. Herein, we report a case of CM due to a novel variation in the SPEG gene, manifested by mild neonatal hypotonia, muscle weakness, delayed motor milestones, and ophthalmoplegia, without dilated cardiomyopathy. We identified a novel variation [c.153C>T (p.Asn51=) in exon 1] in the SPEG gene with whole-exome sequencing and confirmed by Sanger sequencing. Mild intellectual disability has not been associated with SPEG-related CM in the previous reports. We suggest that this report expands the phenotypic spectrum of SPEG-related CM, and further case reports are required to expand the genotype-phenotype correlations.

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© 2021 International Research and Cooperation Association for Bio & Socio-Sciences Advancement
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