Mutational analysis of familial and sporadic hyperekplexia.

Abstract:

:Hyperekplexia is a rare, autosomal dominant neurological disorder characterized by hypertonia, especially in infancy, and by an exaggerated startle response. This disorder is caused by mutations in the alpha 1 subunit of the inhibitory glycine receptor (GLRA1). We previously reported two GLRA1 point mutations detected in 4 unrelated hyperekplexia families; both mutations were at nucleotide 1192 and resulted in the replacement of Arg271 by a glutamine (R271Q) in one case and a leucine (R271L) in the other. Here, 5 additional hyperekplexia families are shown to have the most common G-to-A transition mutation at nucleotide 1192. Haplotype analysis using polymorphisms within and close to the GLRA1 locus suggests that this mutation has arisen at least twice (and possibly four times). In 2 additional families, a third mutation is also presented that changes a tyrosine at amino acid 279 to a cysteine (Y279C). Five patients with atypical clinical features and equivocal or absent family history of hyperekplexia and 1 patient with a classical presentation but not family history are presented in whom a mutation in the GLRA1 gene was not detected. Thus, only clinically typical hyperekplexia appears to be consistently associated with GLRA1 mutations, and these affect a specific extracellular domain of the protein.

journal_name

Ann Neurol

journal_title

Annals of neurology

authors

Shiang R,Ryan SG,Zhu YZ,Fielder TJ,Allen RJ,Fryer A,Yamashita S,O'Connell P,Wasmuth JJ

doi

10.1002/ana.410380115

subject

Has Abstract

pub_date

1995-07-01 00:00:00

pages

85-91

issue

1

eissn

0364-5134

issn

1531-8249

journal_volume

38

pub_type

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