Received on January 24, 2008
Accepted on January 28, 2008

Endocrinology and Metabolism

Combined Newborn Screening for Succinylacetone, Amino Acids, and Acylcarnitines in Dried Blood Spots

¹ Biochemical Genetics Laboratory, Mayo Clinic College of Medicine, Rochester, MN
² Biochemical Genetics Laboratory, Hôpital St. Justine, Montreal, Canada

^* To whom correspondence should be addressed. E-mail: matern{at}mayo.edu.

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 µL 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 µL of a 15 mmol/L hydrazine solution containing the internal standard ¹³C₅-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 ¹³C₅-SUAC (m/z 160–142). Analysis time was 1.2 min.

RESULTS: SUAC was increased in retrospectively analyzed NBS samples of 11 TYR 1 patients (length of storage, 52 months to 1 week; SUAC range, 13–81 µmol/L), with Tyr concentrations ranging from 90 to 259 µmol/L in the original NBS analysis. The mean concentration of SUAC in 13 521 control DBS was 1.25 µmol/L.

CONCLUSION: The inclusion of SUAC analysis into routine analysis of AC and AA allows for rapid and cost-effective screening for TYR 1 with no tangible risk of false-negative results.