Newborn screening for Fabry disease by measuring GLA activity using tandem mass spectrometry

BackgroundFabry 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.MethodsOne 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.ResultsThe 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.ConclusionsThe 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.