Dinucleotide repeat polymorphisms at the SCN4A locus suggest allelic heterogeneity of hyperkalemic periodic paralysis and paramyotonia congenita.

Journal Article (Journal Article)

Two polymorphic dinucleotide repeats--one (dGdA)n and one (dGdT)n--have been identified at the SCN4A locus, encoding the alpha-subunit of the adult skeletal muscle sodium channel. When typed using PCR, the dinucleotide repeats display 4 and 10 alleles, respectively, with a predicted heterozygosity of .81 for the combined haplotype. We have applied these polymorphisms to the investigation of hyperkalemic periodic paralysis and paramyotonia congenita, distinct neuromuscular disorders both of which are thought to involve mutation at SCN4A. Our data confirm the genetic linkage of both disorders with SCN4A. Haplotype analysis also indicates the strong likelihood of allelic heterogeneity in both disorders.

Full Text

Duke Authors

Cited Authors

  • McClatchey, AI; Trofatter, J; McKenna-Yasek, D; Raskind, W; Bird, T; Pericak-Vance, M; Gilchrist, J; Arahata, K; Radosavljevic, D; Worthen, HG

Published Date

  • May 1992

Published In

Volume / Issue

  • 50 / 5

Start / End Page

  • 896 - 901

PubMed ID

  • 1315122

Pubmed Central ID

  • PMC1682609

International Standard Serial Number (ISSN)

  • 0002-9297


  • eng

Conference Location

  • United States