Abstract
Newborn screening (NBS) using tandem mass spectrometry (MS/MS) permits detection of neonates with Glutaric Aciduria-Type II (GA-II). We report follow-up of positive GA-II screens by the New England Newborn Screening Program.
Methods: 1.5 million infants were screened for GA-II (Feb 1999–Dec 2012). Specialist consult was suggested for infants with two or more acylcarnitine elevations suggestive of GA-II.
Results: 82 neonates screened positive for GA-II, 21 weighing > 1.5 kg and 61 weighing ≤ 1.5 kg. Seven (one weighing < 1.5 kg), were confirmed with GA-II. Four of these had the severe form (died < 1 week). The other three have a milder form and were identified because of newborn screening. Two (ages > 5 years) have a G-Tube in place, had multiple hospitalizations and are slightly hypotonic. The third infant remains asymptomatic (9 months old). Two GA-II carriers were also identified. The remaining positive screens were classified as false positives (FP). Six infants (> 1.5 kg) classified as FP had limited diagnostic work-up. Characteristics and outcomes of all specimens and neonates with a positive screen were reviewed, and marker profiles of the cases and FP were compared to identify characteristic profiles.
Conclusion: In addition to the severe form of GA-II, milder forms of GA-II and some GA-II carriers are identified by newborn screening. Some positive screens classified as FP may be affected with a milder form of the disorder. Characteristic GA-II profiles, quantified as GA-II indexes, may be utilized to predict probability of disorder and direct urgency of intervention for positive screens.
Competing interests: None declared
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Abbreviations
- C0:
-
Free carnitine
- C10:
-
Decanoylcarnitine
- C10OH:
-
Hydroxydecanoylcarnitine
- C14:
-
Tetradecanoylcarnitine
- C14:1:
-
Tetradecenoylcarnitine
- C2:
-
Acetylcarnitine
- C3:
-
Propionylcarnitine
- C4:
-
Butyrylcarnitine
- C5:
-
Isovalerylcarnitine
- C5DC:
-
Glutarylcarnitine
- C5OH:
-
Hydroxyisovalerylcarnitine
- C6:
-
Hexanoylcarnitine
- C8:
-
Octonoylcarnitine
- DOL:
-
Day of life
- ETF:
-
Electron transfer flavoprotein
- ETF-DH:
-
Electron transfer flavoprotein dehydrogenase
- FAOD:
-
Fatty acid oxidation defects
- FP:
-
False positive
- GA-II:
-
Glutaric aciduria-type II
- MADD:
-
Multiple acyl-CoA dehydrogenase deficiency
- MCAD:
-
Medium chain acyl-CoA dehydrogenase deficiency
- MS/MS:
-
Tandem mass spectrometry
- NBS:
-
Newborn screening
- NENSP:
-
New England Newborn Screening Program
- NICU:
-
Neonatal intensive care unit
- OOR:
-
Out of range
- SCAD:
-
Short-chain acyl-CoA dehydrogenase deficiency
- TP:
-
True positive
- TPN:
-
Total parental nutrition
- VLBW:
-
Very low birth weight
- VLCADD:
-
Very long chain acyl-CoA dehydrogenase deficiency
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Acknowledgments
The authors wish to acknowledge the Massachusetts Department of Health, the Maine Department of Health and Human Services, the New Hampshire Department of Health and Human Services, the Rhode Island Department of Health, and the Vermont Department of Health for their partnership and cooperation. Further, the efforts of the treating physicians cannot be underscored. This study was supported in part by Priority Focus I and Priority Focus II funding bound to HRSA Grant U22MC03959.
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Communicated by: Piero Rinaldo, MD, PhD
Appendices
Synopsis
We report the experience of the New England Newborn Screening Program in identifying individuals at risk for GA-II, the characteristics and outcomes of all specimens and neonates with a positive screen, and long-term outcomes of confirmed cases.
Conflict of Interest
All authors (I Sahai, CL Garganta, J Bailey, P James, HL Levy M Martin, E Neilan, C Phornphutkul, DA Sweetser, TH Zytkovicz and RB Eaton ) declare that they have no conflict of interest.
Informed Consent/Human or Animal Studies
This report summarizes the experience of the New England Newborn Screening Program. This chapter does not contain any studies with human or animal subjects performed by any of the authors.
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Sahai, I. et al. (2013). Newborn Screening for Glutaric Aciduria-II: The New England Experience. In: Zschocke, J., Gibson, K., Brown, G., Morava, E., Peters, V. (eds) JIMD Reports - Case and Research Reports, Volume 13. JIMD Reports, vol 13. Springer, Berlin, Heidelberg. https://doi.org/10.1007/8904_2013_262
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DOI: https://doi.org/10.1007/8904_2013_262
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