Combined newborn screening for succinylacetone, amino acids, and acylcarnitines in dried blood spots

BACKGROUND: Tyrosinemia type I (TYR 1) is a disorder causing early death if left untreated. Newborn screening (NBS) for this condition is problematic because determination of the diagnostic marker, succinylacetone (SUAC), requires a separate first-tier or only partially effective second-tier analysis based on tyrosine concentration. To overcome these problems, we developed a new assay that simultaneously determines acylcarnitines (AC), amino acids (AA), and SUAC in dried blood spots (DBS) by flow injection tandem mass spectrometry (MS/MS). METHODS: We extracted 3/16-inch DBS punches with 300 mu L methanol containing AA and AC stable isotope-labeled internal standards. This extract was derivatized with butanol-HCl. In parallel, we extracted SUAC from the residual filter paper with 100 mu L of a 15 mmol/L hydrazine solution containing the internal standard C-13(5)-SUAC. We combined the derivatized aliquots in acetonitrile for MS/MS analysis of AC and AA with additional SRM experiments for SUAC (m/z 155-137) and C-13(5)-SUAC (m/z 160-142). Analysis time was 1.2 min. RESULTS: SUAC was increased in retrospectively analyzed NBS samples of I I TYR I patients (length of storage, 52 months to I week; SUAC range, 13-81 mu Lmol/L), with Tyr concentrations ranging from 65 to 293 mu mol/L in the original NBS analysis. The mean concentration of SUAC in 13 521 control DBS was 1.25 mu mol/L. CONCLUSION: The inclusion of SUAC analysis into routine analysis of AC and AA allows for rapid and cost-effective screening for TYR I with no tangible risk of false-negative results. (c) 2008 American Association for Clinical Chemistry.