Document Detail


Mutations in the muscle sodium channel gene (SCN4A) in 13 French families with hyperkalemic periodic paralysis and paramyotonia congenita: phenotype to genotype correlations and demonstration of the predominance of two mutations.
MedLine Citation:
PMID:  8044656     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Hyperkalemic periodic paralysis (hyperPP), paramyotonia congenita (PC) and PC with myotonia permanens are closely related muscle disorders of genetic origin due to allelic mutations in the muscle sodium channel gene, SCN4A. Seven families of French origin with hyperPP were studied. Five of these had the Thr704Met mutation, but 2 families, genetically linked to SCN4A, failed to show any of the known mutations of SCN4A. Correlations between the phenotype and the genotype were made for patients with the Thr704Met mutation. All 12 patients over 30 years old with the Thr704Met mutation presented muscle weakness due to degeneration of muscle fibers in addition to periodic paralysis. Only approximately 12.5% of patients with the Thr704Met mutation presented with clinical myotonia and about 50% with hyperkalemia. One family with PC displayed the Gly1306Val mutation with a phenotype similar to the one already reported for this mutation. Five families with either PC or PC with myotonia permanens had the Thr1313Met mutation indicating that the severity of myotonia and its permanence were variable. Two mutations of SCN4A were found to be predominant in these 13 families: the Thr704Met and the Thr1313Met mutations. Only 2 families with the Thr704Met mutation and 3 families with the Thr1313Met shared the same SCN4A haplotype determined with intragenic dinucleotide repeats. Recurrent mutations of SCN4A may contribute to the predominance of these two mutations in the French population.
Authors:
E Plassart; J Reboul; C S Rime; D Recan; P Millasseau; B Eymard; J Pelletier; C Thomas; F Chapon; C Desnuelle
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  European journal of human genetics : EJHG     Volume:  2     ISSN:  1018-4813     ISO Abbreviation:  Eur. J. Hum. Genet.     Publication Date:  1994  
Date Detail:
Created Date:  1994-08-26     Completed Date:  1994-08-26     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9302235     Medline TA:  Eur J Hum Genet     Country:  SWITZERLAND    
Other Details:
Languages:  eng     Pagination:  110-24     Citation Subset:  IM    
Affiliation:
INSERM U-134, Hôpital de la Salpêtrière, Paris, France.
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MeSH Terms
Descriptor/Qualifier:
Adolescent
Base Sequence
Chi-Square Distribution
Child
Child, Preschool
DNA Mutational Analysis
DNA Primers
DNA, Single-Stranded / analysis
Female
France
Gene Frequency
Genotype
Humans
Hyperkalemia / genetics*
Infant
Linkage (Genetics)
Male
Molecular Sequence Data
Myotonia Congenita / genetics*
Nucleic Acid Conformation
Paralyses, Familial Periodic / genetics*
Pedigree
Phenotype
Point Mutation*
Polymerase Chain Reaction
Polymorphism, Genetic
Sodium Channels / genetics*
Chemical
Reg. No./Substance:
0/DNA Primers; 0/DNA, Single-Stranded; 0/Sodium Channels

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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