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Clin Chim Acta. 2010 Oct 9;411(19-20):1428-31. doi: 10.1016/j.cca.2010.03.009. Epub 2010 Mar 22.

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

Author information

1
Department of General Paediatrics and Neonatology, University Children's Hospital, Vienna, Austria.

Abstract

BACKGROUND:

Fabry disease (FD) is an X-linked lysosomal storage disorder caused by the deficiency of alpha-galactosidase A (GLA). We evaluated a tandem mass spectrometry method to measure GLA activity.

METHODS:

One 3.2mm 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 + or - 6.4 micromol/h/l (CI 95% is 9.67-10.02 micromol/h/l); The median GLA activity of female newborns (N=4677) was 10.2 + or - 6.3 micromol/h/l (CI 95% is 10.02-10.38 micromol/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 micromol/h/l. The GLA activities from 32 juvenile and adult females with confirmed FD were below 4.73 micromol/h/l. In 5 (16%) females GLA activities were above the 0.5th percentile of lower limit of CI 95% at 3.18 micromol/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.

PMID:
20338160
DOI:
10.1016/j.cca.2010.03.009
[Indexed for MEDLINE]

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