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Variable clinical presentation in patients with defective E1 component of pyruvate dehydrogenase complex
B H Robinson1, H MacMillan, R Petrova-Benedict
1Department of Pediatrics and Biochemistry, University of Toronto, Canada.
The Journal of Pediatrics
|October 1, 1987
Summary
Pyruvate dehydrogenase complex deficiency in fibroblasts is linked to severe neurological issues and developmental delays in children. This condition, characterized by lactic acidemia, significantly impacts patient outcomes and survival rates.
Area of Science:
- Biochemistry
- Neurology
- Genetics
Background:
- Lactic acidemia can result from various metabolic disorders.
- Pyruvate dehydrogenase complex (PDC) deficiency is a rare genetic condition affecting cellular metabolism.
- Understanding the clinical spectrum of PDC deficiency is crucial for diagnosis and management.
Purpose of the Study:
- To characterize the clinical findings in a cohort of patients with pyruvate dehydrogenase complex deficiency.
- To correlate fibroblast PDC activity with clinical outcomes and neurological damage.
- To compare this cohort with previously reported cases.
Main Methods:
- Analysis of clinical data from 30 patients with lactic acidemia and reduced fibroblast PDC activity.
- Measurement of residual PDC activity in patient-derived fibroblasts.
- Neuroimaging (CT scans) and autopsy findings were used to assess central nervous system damage.
Main Results:
- Reduced PDC activity was observed in all 30 patients, ranging from 1.6% to 68.5% of control levels.
- High mortality rate, with 12 patients dying before age 2.
- Psychomotor retardation was present in 21 out of 27 evaluated patients; 17 had structural CNS damage.
Conclusions:
- Pyruvate dehydrogenase complex deficiency is associated with severe neurological impairment and significant mortality in affected children.
- The clinical presentation includes lactic acidemia, psychomotor retardation, and structural central nervous system damage.
- This patient cohort confirms the severity and characteristic features of PDC deficiency.