Abstract
Background: Fabry disease (FD) is an X-linked lysosomal storage disorder caused by the deficiency of α-galactosidase A (GLA). We evaluated a tandem mass spectrometry method to measure GLA activity. Methods: One 3.2. mm punch from a dried blood spot sample (DBS) was incubated with substrate and internal standard in the reaction buffer for 22. h. The resulting product was quantified against internal standard using MS/MS. Results: The median GLA activity of male newborn DBS (N=5025) was 9.85 ± 6.4 μmol/h/l (CI 95% is 9.67-10.02 μmol/h/l); The median GLA activity of female newborns (N=4677) was 10.2 ± 6.3 μmol/h/l (CI 95% is 10.02-10.38 μmol/h/l). The difference between the two subgroups is within assay analytical variation. The GLA activities in the DBS samples from 9 juvenile and adult males with previously identified FD were below 1.64 μmol/h/l. The GLA activities from 32 juvenile and adult females with confirmed FD were below 4.73 μmol/h/l. In 5 (16%) females GLA activities were above the 0.5th percentile of lower limit of CI 95% at 3.18 μmol/h/l. Conclusions: The MS/MS method for Fabry disease newborn screening is robust and can be readily multiplexed with other lysosomal disorders such as Pompe, Gaucher, Niemann-Pick, and Krabbe diseases.
Original language | English (US) |
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Pages (from-to) | 1428-1431 |
Number of pages | 4 |
Journal | Clinica Chimica Acta |
Volume | 411 |
Issue number | 19-20 |
DOIs | |
State | Published - Oct 2010 |
Keywords
- Dried blood
- Fabry disease
- Galactosidase
- Newborn screening
- Tandem mass spectrometry
ASJC Scopus subject areas
- Biochemistry
- Clinical Biochemistry
- Biochemistry, medical