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3-Hydroxy-2-methylbutyryl-CoA dehydrogenase deficiency.
V R Sutton1, W E O'Brien, G D Clark
1Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas, USA. vsutton@bcm.tmc.edu
Journal of Inherited Metabolic Disease
|July 23, 2003
Summary
A rare metabolic disorder, 3-hydroxy-2-methylbutyryl-CoA dehydrogenase deficiency, caused developmental arrest, regression, and seizures in a young boy. Early diagnosis through urine organic acid analysis is crucial for identifying this condition.
Area of Science:
- Biochemistry
- Genetics
- Pediatric Neurology
Background:
- Metabolic disorders can present with severe neurological symptoms in early childhood.
- Genetic defects in enzyme pathways lead to the accumulation of toxic metabolites.
Observation:
- A male infant presented with developmental arrest, regression, cortical blindness, and myoclonic seizures at 21 months.
- Clinical presentation suggested a significant underlying metabolic or neurological condition.
Findings:
- Urine organic acid analysis identified elevated levels of 3-hydroxy-2-methylbutyric acid and tiglyglycine.
- Despite normal 3-ketothiolase enzyme activity, the patient was diagnosed with 3-hydroxy-2-methylbutyryl-CoA dehydrogenase deficiency.
Implications:
- This case highlights the importance of comprehensive metabolic investigations in children with unexplained neurological decline.
- Accurate diagnosis of 3-hydroxy-2-methylbutyryl-CoA dehydrogenase deficiency enables targeted management and genetic counseling.
- Understanding this deficiency contributes to the broader knowledge of organic acidemias and their impact on neurodevelopment.