High-throughput tandem mass spectrometry multiplex analysis for newborn urinary screening of creatine synthesis and transport disorders, Triple H syndrome and OTC deficiency

Clin Chim Acta. 2014 Sep 25:436:249-55. doi: 10.1016/j.cca.2014.05.024. Epub 2014 Jun 6.

Abstract

Background: Creatine synthesis and transport disorders, Triple H syndrome and ornithine transcarbamylase deficiency are treatable inborn errors of metabolism. Early screening of patients was found to be beneficial. Mass spectrometry analysis of specific urinary biomarkers might lead to early detection and treatment in the neonatal period. We developed a high-throughput mass spectrometry methodology applicable to newborn screening using dried urine on filter paper for these aforementioned diseases.

Methods: A high-throughput methodology was devised for the simultaneous analysis of creatine, guanidineacetic acid, orotic acid, uracil, creatinine and respective internal standards, using both positive and negative electrospray ionization modes, depending on the compound.

Results: The precision and accuracy varied by <15%. Stability during storage at different temperatures was confirmed for three weeks. The limits of detection and quantification for each biomarker varied from 0.3 to 6.3 μmol/l and from 1.0 to 20.9 μmol/l, respectively. Analyses of urine specimens from affected patients revealed abnormal results. Targeted biomarkers in urine were detected in the first weeks of life.

Conclusions: This rapid, simple and robust liquid chromatography/tandem mass spectrometry methodology is an efficient tool applicable to urine screening for inherited disorders by biochemical laboratories.

Keywords: Creatine synthesis and transport disorders; Mass spectrometry; Newborn screening; OTC deficiency; Triple H syndrome; Urine dried on filter paper.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Biomarkers / urine
  • Creatine / urine
  • Creatinine / urine
  • Filtration
  • Glycine / analogs & derivatives
  • Glycine / urine
  • Humans
  • Hyperammonemia / diagnosis*
  • Hyperammonemia / urine*
  • Infant, Newborn
  • Ornithine / deficiency*
  • Ornithine / urine
  • Ornithine Carbamoyltransferase Deficiency Disease / diagnosis*
  • Ornithine Carbamoyltransferase Deficiency Disease / urine*
  • Orotic Acid / urine
  • Paper
  • Reference Values
  • Reproducibility of Results
  • Tandem Mass Spectrometry / methods*
  • Tandem Mass Spectrometry / standards
  • Uracil / urine
  • Urea Cycle Disorders, Inborn / diagnosis*
  • Urea Cycle Disorders, Inborn / urine*
  • Urinalysis / methods*
  • Urinalysis / standards

Substances

  • Biomarkers
  • Uracil
  • Orotic Acid
  • Creatinine
  • Ornithine
  • glycocyamine
  • Creatine
  • Glycine

Supplementary concepts

  • HHH syndrome