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Screening for adenylosuccinate lyase deficiency using tandem mass spectrometry analysis of succinylpurines in neonatal dried blood spots.

Abstract：

OBJECTIVES:Stable isotope dilution coupled with liquid chromatography-tandem mass spectrometry (LC-MS/MS) is the sensitive method for screening for various inherited metabolic disorders using dried blood spots (DBSs). We present a method for LC-MS/MS determination of succinyladenosine (SAdo) and succinylaminoimidazole carboxamide riboside (SAICAr), biomarkers for adenylosuccinate lyase deficiency (dADSL), in DBS. DESIGN AND METHODS:SAICAr and SAdo were separated on a Symmetry-C18 column and detected using positive electrospray ionisation in selected reaction monitoring mode. The quantification was performed using the isotopically labelled internal standards SAdo-(13)C4 and SAICAr-(13)C4, which were prepared via ADSL-catalysed reactions of fumarate-(13)C4 with adenosine monophosphate and aminoimidazole carboxamide ribotide, respectively, and subsequent alkaline phosphatase-catalysed dephosphorylation of the resulting products. RESULTS:The detection of SAICAr and SAdo in DBS was linear over the range of 0-25μmol/L. The respective intra-assay and inter-assay imprecision values were less than 10.7% and 15.2% for SAICAr and 4.7% and 5.7% for SAdo. The recoveries from DBS spiked with different concentrations of SAICAr and SAdo were between 94% and 117%. The concentrations of SAICAr and SAdo were higher in the archived DBS from dADSL patients (SAICAr, 0.03-4.7μmol/L; SAdo, 1.5-21.3μmol/L; n=5) compared to those of the control subjects (SAICAr, 0-0.026μmol/L; SAdo, 0.06-0.14μmol/L; n=31), even after DBSs from dADSL patients were stored for 2-23years. CONCLUSIONS:We developed and validated a method of succinylpurine analysis in DBS that improves selective screening for dADSL in the paediatric population and may be used for retrospective diagnosis to aid the genetic counselling of affected families.

journal_name

Clin Biochem

journal_title

Clinical biochemistry

authors

Zikanova M,Krijt J,Skopova V,Krijt M,Baresova V,Kmoch S

doi

10.1016/j.clinbiochem.2014.10.004

subject

Has Abstract

pub_date

2015-01-01 00:00:00

pages

2-7

issue

1-2

eissn

0009-9120

issn

1873-2933

pii

S0009-9120(14)00731-0

journal_volume

48

pub_type

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