Hyperkalemic familial periodic paralysis (FPP) is an autosomal dominant muscle disease with onset in infancy or early childhood. This disorder is manifested by transient episodes of paralysis, frequently associated with elevated serum potassium levels. I have obtained a large pedigree containing 40 living individuals affected by hyperkalemic FPP. This family will form the basis for identifying markers linked to this disease. The expected optimal LOD score in this kindred is 18.6. The long term goal of this work is to characterize the gene and its product. Compelling electrophysiologic and biochemical evidence implicates altered sodium regulation as the defect in this disease. It is reasonable to assume that a mutation in a skeletal muscle sodium channel (NaCh) or Na+/K+-ATPase gene is responsible for the disease. I have obtained a human brain NaCh and several Na+/L+-ATPase genes and plan to use them as probes in a linkage study of hyperkalemic FPP. If the disease gene does not co-segregate with one of the candidate genes, a general linkage approach will be used to identify closely linked markers to the disease gene. Additionally, I have obtained a human skeletal muscle cDNA library and will screen it with a human brain NaCh and rat skeletal muscle NaCh genes to isolate additional candidate genes. The second phase of the project will depend on the method with which linkage is established. Co-segregation of a candidate gene with the disease allele will lead to characterization of that gene. If no candidates co-segregate with the disease allele, information from the general linkage will be used to construct a high resolution genetic and physical map. I've also established ties with collaborators who can provide additional pedigrees with the same, and related muscle diseases for further study. This work will lead to prenatal and presymptomatic diagnosis capability. This information may result in better understanding of this disorder, normal muscle development and muscle regulation.

Agency
National Institute of Health (NIH)
Institute
Eunice Kennedy Shriver National Institute of Child Health & Human Development (NICHD)
Type
Physician Scientist Award (K11)
Project #
5K11HD000940-03
Application #
3087083
Study Section
Mental Retardation Research Committee (HDMR)
Project Start
1991-07-01
Project End
1996-06-30
Budget Start
1993-07-01
Budget End
1994-06-30
Support Year
3
Fiscal Year
1993
Total Cost
Indirect Cost
Name
University of Utah
Department
Type
Schools of Medicine
DUNS #
City
Salt Lake City
State
UT
Country
United States
Zip Code
84112
Fouad, G; Dalakas, M; Servidei, S et al. (1997) Genotype-phenotype correlations of DHP receptor alpha 1-subunit gene mutations causing hypokalemic periodic paralysis. Neuromuscul Disord 7:33-8
Flanigan, K; Gardner, K; Alderson, K et al. (1996) Autosomal dominant spinocerebellar ataxia with sensory axonal neuropathy (SCA4): clinical description and genetic localization to chromosome 16q22.1. Am J Hum Genet 59:392-9
Zhang, J; George Jr, A L; Griggs, R C et al. (1996) Mutations in the human skeletal muscle chloride channel gene (CLCN1) associated with dominant and recessive myotonia congenita. Neurology 47:993-8
Fouad, G T; Servidei, S; Durcan, S et al. (1996) A gene for familial paroxysmal dyskinesia (FPD1) maps to chromosome 2q. Am J Hum Genet 59:135-9
Ptacek, L J (1995) Autosomal dominant spinocerebellar atrophy with retinal degeneration. Clin Neurosci 3:28-32
Gouw, L G; Kaplan, C D; Haines, J H et al. (1995) Retinal degeneration characterizes a spinocerebellar ataxia mapping to chromosome 3p. Nat Genet 10:89-93
Tawil, R; Ptacek, L J; Pavlakis, S G et al. (1994) Andersen's syndrome: potassium-sensitive periodic paralysis, ventricular ectopy, and dysmorphic features. Ann Neurol 35:326-30
Ptacek, L J; Tawil, R; Griggs, R C et al. (1994) Dihydropyridine receptor mutations cause hypokalemic periodic paralysis. Cell 77:863-8
Gouw, L G; Digre, K B; Harris, C P et al. (1994) Autosomal dominant cerebellar ataxia with retinal degeneration: clinical, neuropathologic, and genetic analysis of a large kindred. Neurology 44:1441-7
Ptacek, L J; Tawil, R; Griggs, R C et al. (1994) Sodium channel mutations in acetazolamide-responsive myotonia congenita, paramyotonia congenita, and hyperkalemic periodic paralysis. Neurology 44:1500-3

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