A CHRNE frameshift mutation causes congenital myasthenic syndrome in young Jack Russell Terriers

Caitlin J. Rinz, Vanda A Lennon, Fiona James, James B. Thoreson, Kate L. Tsai, Alison N. Starr-Moss, H. Dale Humphries, Ling T. Guo, Anthony C. Palmer, Leigh Anne Clark, G. Diane Shelton

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Congenital myasthenic syndromes (CMSs) are a group of rare genetic disorders of the neuromuscular junction resulting in structural or functional causes of fatigable weakness that usually begins early in life. Mutations in pre-synaptic, synaptic and post-synaptic proteins have been demonstrated in human cases, with more than half involving aberrations in nicotinic acetylcholine receptor (AChR) subunits. CMS was first recognized in dogs in 1974 as an autosomal recessive trait in Jack Russell Terriers (JRTs). A deficiency of junctional AChRs was demonstrated. Here we characterize a CMS in 2 contemporary cases of JRT littermates with classic clinical and electromyographic findings, and immunochemical confirmation of an approximately 90% reduction in AChR protein content. Loci encoding the 5 AChR subunits were evaluated using microsatellite markers, and CHRNB1 and CHRNE were identified as candidate genes. Sequences of the splice sites and exons of both genes revealed a single base insertion in exon 7 of CHRNE that predicts a frameshift mutation and a premature stop codon. We further demonstrated this pathogenic mutation in CHRNE in archival tissues from unrelated JRTs studied 34 years ago.

Original languageEnglish (US)
Pages (from-to)921-927
Number of pages7
JournalNeuromuscular Disorders
Volume25
Issue number12
DOIs
StatePublished - Dec 1 2015

Keywords

  • Animal model
  • Canine
  • Muscle nicotinic acetylcholine receptor
  • Myasthenia gravis
  • Neuromuscular junction

ASJC Scopus subject areas

  • Clinical Neurology
  • Pediatrics, Perinatology, and Child Health
  • Genetics(clinical)
  • Neurology

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