A tandem mass spectrometry triplex assay for the detection of Fabry, Pompe, and mucopolysaccharidosis-I (Hurler).
Clin Chem
; 56(12): 1854-61, 2010 Dec.
Article
em En
| MEDLINE
| ID: mdl-20940330
ABSTRACT
BACKGROUND:
We sought to develop a tandem mass spectrometry assay in which the enzymatic activities of 3 lysosomal enzymes (α-glucosidase, α-galactosidase A, and α-l-iduronidase) could be quantified in dried blood spots by using a single assay buffer.METHODS:
A 3-mm dried blood spot punch was incubated in a single assay buffer with 3 different substrates and internal standards. The sample was processed by a simple liquid-liquid extraction by using ethyl acetate. The extract was dried down and resuspended in solvent for injection into the tandem mass spectrometer. Products and internal standards were monitored by multiple reaction monitoring.RESULTS:
Assay for the 3 lysosomal enzymes was successfully achieved with acceptable statistics. The assay can be performed by using a minimal quantity of disposable supplies and equipment. The entire procedure fits into a 48-h cycle including data analysis. Data from 5990 anonymous newborn dried blood spots showed an approximate bell-shaped distribution of enzymatic activities (mean values of 19.0, 11.5, and 3.5 µmol · h(-1) · (L blood)(-1) for α-glucosidase, α-galactosidase A, and α-l-iduronidase, respectively. Blank values obtained in the absence of blood were 0.13, 0.24, and 0.45 µmol · h(-1) · (L blood)(-1), respectively). By assaying 3 enzymes at once, problematic samples are spotted for reanalysis if enzyme activity values are low for all enzymes (for example, if insufficient blood is present in the assay).CONCLUSIONS:
This method demonstrates that a triplex assay in a single buffer and with minimal supplies and labor can be adapted to a high-throughput newborn screening laboratory for the analysis of Pompe, Fabry, and mucopolysaccharidosis-I (Hurler) diseases.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Doença de Depósito de Glicogênio Tipo II
/
Doença de Fabry
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Mucopolissacaridose I
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Alfa-Galactosidase
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Alfa-Glucosidases
/
Iduronidase
Tipo de estudo:
Diagnostic_studies
Limite:
Adult
/
Humans
/
Infant
/
Male
/
Newborn
Idioma:
En
Revista:
Clin Chem
Assunto da revista:
QUIMICA CLINICA
Ano de publicação:
2010
Tipo de documento:
Article
País de afiliação:
Estados Unidos