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Glutaric acidemia type 1: outcomes before and after expanded newborn screening
Krista Viau1, Sharon L Ernst, Rena J Vanzo
1Department of Pediatrics, Division of Medical Genetics, University of Utah, Salt Lake City, UT 84132, USA. krista.viau@hsc.utah.edu
Molecular Genetics and Metabolism
|June 26, 2012
Summary
Newborn screening for Glutaric acidemia type 1 (GA-1) effectively prevents serious complications. Early detection through newborn screening significantly reduces adverse outcomes like motor dysfunction and dystonia in affected infants.
Area of Science:
- Biochemistry
- Genetics
- Pediatrics
Background:
- Glutaric acidemia type 1 (GA-1) is an inherited metabolic disorder affecting lysine, hydroxylysine, and tryptophan metabolism.
- Patients often present with neurological issues such as brain atrophy and dystonia, typically triggered by infections or dehydration.
Purpose of the Study:
- To evaluate the clinical outcomes of patients with GA-1.
- To assess the effectiveness of newborn screening in preventing GA-1 complications.
Main Methods:
- Analysis of 19 GA-1 patients, comparing outcomes between those diagnosed via newborn screening and clinical diagnosis.
- Genetic testing for mutations in the glutaryl-CoA dehydrogenase gene.
- Biochemical analysis of plasma glutarylcarnitine, urinary 3-hydroxyglutaric acid, and glutaric acid.
Main Results:
- Newborn screening identified 10 patients, while 9 were diagnosed clinically.
- Elevated plasma glutarylcarnitine and urinary 3-hydroxyglutaric acid were observed in all patients.
- Patients identified through newborn screening showed a 75% reduction in adverse outcomes (oral motor, ambulatory, dystonic movements) compared to clinically diagnosed patients (p<0.05).
- Brain MRI findings of wide Sylvian fissures normalized in treated patients by age 4.
Conclusions:
- Newborn screening for GA-1 is highly effective in preventing severe neurological complications.
- Early detection and treatment initiated through newborn screening significantly improve patient outcomes.
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