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Rapid genome sequencing identifies a novel de novo SNAP25 variant for neonatal congenital myasthenic syndrome.
Cold Spring Harbor Molecular Case Studies 2022 November 16
Congenital myasthenic syndrome (CMS) is a group of 32 disorders involving genetic dysfunction at the neuromuscular junction resulting in skeletal muscle weakness that worsens with physical activity. Precise diagnosis and molecular subtype identification are critical for treatment as medication for one subtype may exacerbate disease in another (Finsterer 2019; Prior et al. 2021; Engel et al. 2015). The SNAP25-related CMS subtype (congenital myasthenic syndrome 18, CMS18; MIM #616330) is a rare disorder characterized by muscle fatigability, delayed psychomotor development and ataxia. Herein, we performed rapid whole genome sequencing (rWGS) on a critically ill newborn leading to the discovery of an unreported pathogenic de novo SNAP25 c.529C>T; p.Gln177Ter variant. In this report, we present a novel case of CMS18 related to a variant affecting both SNAP25A and SNAP25B isoforms with complex neonatal consequence. This discovery offers unique insight into the extent of phenotypic severity in CMS18, expands the reported SNAP25 variant phenotype and paves a foundation for personalized management for CMS18.
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