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Erschienen in: Journal of Inherited Metabolic Disease 1/2017

07.10.2016 | Original Article

Newborn screening for mucopolysaccharidoses: a pilot study of measurement of glycosaminoglycans by tandem mass spectrometry

verfasst von: Francyne Kubaski, Robert W. Mason, Akiko Nakatomi, Haruo Shintaku, Li Xie, Naomi N. van Vlies, Heather Church, Roberto Giugliani, Hironori Kobayashi, Seiji Yamaguchi, Yasuyuki Suzuki, Tadao Orii, Toshiyuki Fukao, Adriana M. Montaño, Shunji Tomatsu

Erschienen in: Journal of Inherited Metabolic Disease | Ausgabe 1/2017

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Abstract

Background

Mucopolysaccharidoses (MPS) are a group of inborn errors of metabolism that are progressive and usually result in irreversible skeletal, visceral, and/or brain damage, highlighting a need for early diagnosis.

Methods

This pilot study analyzed 2862 dried blood spots (DBS) from newborns and 14 DBS from newborn patients with MPS (MPS I, n = 7; MPS II, n = 2; MPS III, n = 5). Disaccharides were produced from polymer GAGs by digestion with chondroitinase B, heparitinase, and keratanase II. Heparan sulfate (0S, NS), dermatan sulfate (DS) and mono- and di-sulfated KS were measured by liquid chromatography tandem mass spectrometry (LC-MS/MS). Median absolute deviation (MAD) was used to determine cutoffs to distinguish patients from controls. Cutoffs were defined as median + 7× MAD from general newborns.

Results

The cutoffs were as follows: HS-0S > 90 ng/mL; HS-NS > 23 ng/mL, DS > 88 ng/mL; mono-sulfated KS > 445 ng/mL; di-sulfated KS > 89 ng/mL and ratio di-KS in total KS > 32 %. All MPS I and II samples were above the cutoffs for HS-0S, HS-NS, and DS, and all MPS III samples were above cutoffs for HS-0S and HS-NS. The rate of false positives for MPS I and II was 0.03 % based on a combination of HS-0S, HS-NS, and DS, and for MPS III was 0.9 % based upon a combination of HS-0S and HS-NS.

Conclusions

Combination of levels of two or more different GAGs improves separation of MPS patients from unaffected controls, indicating that GAG measurements are potentially valuable biomarkers for newborn screening for MPS.
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Metadaten
Titel
Newborn screening for mucopolysaccharidoses: a pilot study of measurement of glycosaminoglycans by tandem mass spectrometry
verfasst von
Francyne Kubaski
Robert W. Mason
Akiko Nakatomi
Haruo Shintaku
Li Xie
Naomi N. van Vlies
Heather Church
Roberto Giugliani
Hironori Kobayashi
Seiji Yamaguchi
Yasuyuki Suzuki
Tadao Orii
Toshiyuki Fukao
Adriana M. Montaño
Shunji Tomatsu
Publikationsdatum
07.10.2016
Verlag
Springer Netherlands
Erschienen in
Journal of Inherited Metabolic Disease / Ausgabe 1/2017
Print ISSN: 0141-8955
Elektronische ISSN: 1573-2665
DOI
https://doi.org/10.1007/s10545-016-9981-6

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