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Related Experiment Video

Updated: Feb 22, 2026

Simultaneous Measurement of Superoxide/Hydrogen Peroxide and NADH Production by Flavin-containing Mitochondrial Dehydrogenases
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Enzymatic testing sensitivity, variability and practical diagnostic algorithm for pyruvate dehydrogenase complex

Ha Kyung Shin1, George Grahame2, Shawn E McCandless3

  • 1School of Medicine, Case Western Reserve University (CWRU), Cleveland, OH, USA.

Molecular Genetics and Metabolism
|September 18, 2017
PubMed
Summary
This summary is machine-generated.

Pyruvate dehydrogenase complex (PDC) deficiency diagnosis is crucial for children with lactic acidemia. Fibroblast enzyme assays are highly sensitive for detecting PDC deficiency, regardless of sex, aiding in accurate diagnosis and management.

Keywords:
Biochemical testingDiagnostic algorithmPDHA1Pyruvate dehydrogenase complex deficiencySensitivityVariability

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Area of Science:

  • Biochemistry and Metabolism
  • Genetics and Molecular Biology
  • Pediatric Medicine

Background:

  • Pyruvate dehydrogenase complex (PDC) deficiency is a primary cause of lactic acidemia in children.
  • Accurate diagnosis is vital for effective clinical management and therapeutic strategies.
  • Current diagnostic approaches include genetic and enzymatic testing, but their efficacy requires systematic investigation.

Purpose of the Study:

  • To evaluate the diagnostic sensitivity and variability of PDC enzyme assays in males and females.
  • To compare the efficacy of different cell/tissue types (lymphocytes, fibroblasts, muscle) for PDC deficiency testing.
  • To propose a diagnostic algorithm considering enzyme assay sensitivity, genetic factors, and patient demographics.

Main Methods:

  • Analysis of data from 186 subjects with lactic acidosis and functional PDC deficiency at the Center for Inherited Disorders of Energy Metabolism (CIDEM).
  • Filtering subjects based on lactic acidosis and PDC deficiency in blood lymphocytes, cultured fibroblasts, or skeletal muscle.
  • Evaluation of diagnostic sensitivity of PDC enzyme assays across different cell types and genders, particularly for PDHA1 mutations.

Main Results:

  • Cultured fibroblast PDC assays demonstrated high sensitivity (97% in females, 91% in males) for PDHA1-related deficiency.
  • Lymphocyte and muscle assays showed lower sensitivity, especially in females (36% and 58%, respectively).
  • In males with PDHA1 mutations, sensitivities of lymphocyte (75%), fibroblast (91%), and muscle (88%) assays were not significantly different.

Conclusions:

  • Fibroblast-based PDC enzyme assays are highly sensitive and reliable for diagnosing PDHA1-related deficiency in both sexes.
  • Lymphocyte and muscle assays exhibit lower sensitivity and greater variability, necessitating careful interpretation.
  • A proposed diagnostic algorithm integrates molecular testing, enzyme assay sensitivity, and cell-type specific variations for improved diagnostic accuracy.