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Improved detection of Duchenne muscular dystrophy heterozygotes using discriminant analysis of creatine kinase levels.

Abstract
We have assessed the sensitivity and specificity of tests to detect carriers of Duchenne muscular dystrophy by use of three serum enzymes (creatine kinase, pyruvate kinase, and aldolase) and discriminant analysis in 21 obligate heterozygotes and 28 normal controls. We found no significant age effects on enzyme levels. Each enzyme level considered separately was significantly higher in heterozygotes. Use of logs improved discrimination, and log CK was sufficient by itself as a discriminant (that is, addition of other enzymes did not significantly improve discrimination). We present procedures to generate posteriori probabilities for genetic counselling that incorporate prior probabilities and enzyme levels. Our results show both improved sensitivity (90%) and specificity (86%).
AuthorsW A Muir, J Knoke, A Martin, P Vignos, A McErlean
JournalAmerican journal of medical genetics (Am J Med Genet) Vol. 14 Issue 1 Pg. 125-34 (Jan 1983) ISSN: 0148-7299 [Print] United States
PMID6829600 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
Chemical References
  • Pyruvate Kinase
  • Creatine Kinase
  • Fructose-Bisphosphate Aldolase
Topics
  • Adult
  • Aged
  • Chromosomes
  • Creatine Kinase (blood)
  • Female
  • Fructose-Bisphosphate Aldolase (blood)
  • Genes, Recessive
  • Genetic Carrier Screening
  • Genetic Counseling
  • Genetic Linkage
  • Humans
  • Middle Aged
  • Muscular Dystrophies (genetics, prevention & control)
  • Probability
  • Pyruvate Kinase (blood)

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