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Detection of glutaric acidemia type 1 in infants through tandem mass spectrometry

Ruby P Babu1, G Bishnupriya1, P K Thushara1

  • 1NeoGen Labs Pvt. Ltd., India.

Molecular Genetics and Metabolism Reports
|March 4, 2016
PubMed

Insights

Tandem mass spectrometry effectively screens for Glutaric acidemia type 1 (GA1) in newborns and children. Early diagnosis and treatment are crucial for better outcomes in this rare metabolic disorder.

Area of Science:

  • Biochemistry
  • Clinical Genetics
  • Neonatal Screening

Background:

  • Glutaric acidemia type 1 (GA1) is a rare inherited metabolic disorder often underdiagnosed due to subtle symptoms and a latent period.
  • Early detection of GA1 is critical for preventing severe neurological damage and developmental delays.
  • Traditional diagnostic methods may not be sufficient for timely GA1 identification in at-risk populations.

Purpose of the Study:

  • To evaluate the sensitivity and specificity of tandem mass spectrometry (MS/MS) for screening Glutaric acidemia type 1 (GA1) in dried blood spots.
  • To assess the clinical utility and cost-effectiveness of MS/MS in a pilot study for GA1 detection.
  • To highlight the importance of early diagnosis for improving patient outcomes in GA1.

Main Methods:

  • A pilot study screened 17,100 dried blood spot specimens from pediatric patients and newborns using an Abbott (AB) Sciex 3200 MS/MS system.
  • Specimens were selected based on specific criteria to broaden the testing range.
  • Presumptive positive cases underwent confirmation, and treatment was initiated.

Main Results:

  • 14 specimens tested presumptive positive for GA1, all from symptomatic individuals.
  • Diagnosis was confirmed in 4 cases, with others empirically treated; most showed favorable responses to dietary management.
  • MS/MS demonstrated high sensitivity (>93.33%) and specificity (>99.42%) for GA1 screening.
  • Older diagnosed children with GA1 exhibited poorer recovery from developmental delays and mental deterioration, underscoring the need for early detection.

Conclusions:

  • Tandem mass spectrometry is a highly sensitive and specific, simple, and economical method for screening Glutaric acidemia type 1.
  • Early diagnosis of GA1 through MS/MS screening is essential for timely intervention and improved patient outcomes.
  • The study reinforces the critical need for early biochemical defect detection in pediatric populations to prevent irreversible neurological damage.

Keywords:
Glutaric acidemiaOrganic acidemiasTandem mass

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