Related Experiment Videos
Glutaryl-coenzyme A dehydrogenase deficiency: a distinct encephalopathy
G F Hoffmann1, F K Trefz, P G Barth
1Department of Pediatrics, University of Heidelberg, Federal Republic of Germany.
Insights
Glutaryl-coenzyme A dehydrogenase deficiency can cause severe neurological issues, including basal ganglia disorders. Early treatment before symptom onset may lead to normal development, but outcomes remain uncertain.
Area of Science:
- Biochemistry
- Neuroscience
- Genetics
Background:
- Glutaryl-coenzyme A dehydrogenase (GACD) deficiency is a rare metabolic disorder.
- It can lead to severe neurological complications, including basal ganglia dysfunction and cerebral atrophy.
- Macrocephaly is a common early sign preceding neurological disease.
Purpose of the Study:
- To evaluate the clinical course, diagnosis, treatment, and neurodevelopmental outcomes in patients with GACD deficiency.
- To assess the efficacy of current therapeutic interventions for GACD deficiency.
Main Methods:
- Retrospective analysis of 11 patients with GACD deficiency.
- Clinical evaluation, neuroimaging (CT, MRI), and biochemical assessments.
- Assessment of treatment protocols including low-protein diets and supplements.
Main Results:
- Macrocephaly was present in 9 patients; 7 developed encephalitis-like illness, and 2 had dystonic cerebral palsy.
- Severe generalized cerebral atrophy was observed in 10 patients.
- Treatment halted deterioration but resulted in limited clinical improvement; early intervention before symptoms showed promise.
Conclusions:
- GACD deficiency presents with significant neurological morbidity, often preceded by macrocephaly.
- Therapeutic measures effectively reduced glutaric acid production but did not normalize plasma/CSF levels, contributing to poor outcomes.
- While early treatment is encouraging, further long-term studies are needed to confirm GACD deficiency as a treatable disorder.
Abstract:
Clinical course, diagnostic and therapeutic management, and neurodevelopmental outcome were evaluated in 11 patients with glutaryl-coenzyme A dehydrogenase deficiency. In 9 patients macrocephalus was present at or shortly after birth and preceded the neurological disease. In 7 children an acute illness resembling encephalitis appeared after a period of normal development; 2 had developmental delay and progressive "dystonic cerebral palsy." Later, all 9 displayed typical signs of a disorder of the basal ganglia. In 1 patient with macrocephalus the disorder was diagnosed before the onset of neurological disease; in another it was diagnosed prenatally. Computed tomography and magnetic resonance imaging scans revealed severe generalized cerebral atrophy, most striking in the frontal and temporal lobes in 10 patients. Further deterioration was halted after initiation of treatment consisting of low-protein diets, special formulas low in lysine and tryptophan, and supplements of riboflavin and L-carnitine. Only 1 patient showed a slight clinical improvement. Later, dietary therapy was discontinued in 2 older patients and relaxed in a third without observed adverse effects. Two patients in whom treatment could be initiated before the onset of neurological symptoms have developed normally. However, duration of follow-up (6 and 29 months) does not yet allow classification of glutaryl-coenzyme A dehydrogenase deficiency as a treatable disorder. Total body production of glutaric acid, reflected in the daily urinary output, was efficiently reduced by therapeutic measures. Levels of glutaric acid in plasma and cerebrospinal fluid remained unchanged, which may in part explain the overall unsatisfactory outcome. All patients presented with a severe secondary deficiency of carnitine.(ABSTRACT TRUNCATED AT 250 WORDS)