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Variants of SLC18A3 leading to congenital myasthenic syndrome in two children with varying presentations
  1. Allison Lamond1,
  2. David Buckley2,
  3. Jennifer O'Dea1 and
  4. Lesley Turner3
  1. 1Pediatrics, Memorial University of Newfoundland Faculty of Medicine, St. John's, Newfoundland and Labrador, Canada
  2. 2Pediatric Neurology, Memorial University of Newfoundland Faculty of Medicine, St. John's, Newfoundland and Labrador, Canada
  3. 3Genetics, Memorial University of Newfoundland Faculty of Medicine, St. John's, Newfoundland and Labrador, Canada
  1. Correspondence to Dr David Buckley; david.buckley{at}easternhealth.ca

Abstract

This report describes the variation in presentation of two unrelated patients found to have a rare form of presynaptic congenital myasthenic syndrome. Both patients presented with hypotonia, ptosis, poor weight gain and apneic episodes. Through whole exome sequencing, our patients were found to have the same likely pathogenic biallelic variants in W315X and I200N of SLC18A3, encoding vesicular acetylcholine transporter (VAChT). These specific variants in SLC18A3 have not been previously described in the literature. We illustrate the variety in clinical presentation and course of children with mutations in SLC18A3, leading to presynaptic congenital myasthenic syndrome through VAChT deficiency.

  • neurogenetics
  • neuromuscular disease
  • congenital disorders

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Footnotes

  • Contributors Supervised by DB. Patient was under the care of DB and JO. LT was involved in acquisition of data and interpretation of results. Report was written by AL and reviewed by DB, LT and JO.

  • Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

  • Competing interests None declared.

  • Patient consent for publication Parental/guardian consent obtained.

  • Provenance and peer review Not commissioned; externally peer reviewed.

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