Analysis of glucocerebrosidase activity in dry blood spots using tandem mass spectrometry.

Abstract Background Gaucher disease (GD) is due to deficiency of acid-β-glucosidase (ABG) and comprises a clinical spectrum with variable age of onset and severity. We evaluated a tandem mass spectrometry (MS/MS) method to measure ABG activity for high through-put screening. Methods ABG activity was measured in 3.2 mm punches from dry blood spots (DBS). Each punch was incubated for 21 h with the substrate D-Glucosyl-β1-1′-N-dodecanoyl-D-erythro- sphingosine[C12- glucocerebroside(C 36 H 69 NO 8 )] and internal standard N- myristoyl-D-erythro- sphingosine[C14-ceramide (C 32 H 63 NO 3 )]. The product and internal standard were quantified using MS/MS. Results ABG activities in anonymized newborn screeningsamples from NY State were (mean) 22.0 μmol/h/L ± (SD) 13.8 μmol/h/L (n = 2088, median 19.9 μmol/h/L, 95%CI 22.59–21.41 μmol/h/L). The enzymatic activity in DBS from 10 treatment naive adult Gaucher patients was less than 4.2 μmol/h/L. ABG activity was stable for 3 months at room temperature a 20% activity reduction was observed. Inter- and intra-run imprecisions were 8% and 13.7%, respectively. The limit of detection was 0.75 μmol/h/L and limit of quantification was 1.25 μmol/h/L. Conclusions The measurement of ABG activities in DBS using MS/MS is suitable for high-throughput analysis of at-risk individuals and potentially for newborn screeningfor GD.