Streamlined determination of lysophosphatidylcholines in dried blood spots for newborn screening of X-linked adrenoleukodystrophy

Coleman T. Turgeon, Ann B. Moser, Lars Mørkrid, Mark J. Magera, Dimitar K. Gavrilov, Devin Oglesbee, Kimiyo Raymond, Piero Rinaldo, Dietrich Matern, Silvia Tortorelli

Research output: Contribution to journalArticle

33 Scopus citations

Abstract

Background: Pre-symptomatic hematopoietic stem cell transplantation is essential to achieve best possible outcomes for patients with the childhood cerebral form of X-linked adrenoleukodystrophy (X-ALD). We describe a high-throughput method for measurement of C20-C26 lysophosphatidylcholines (LPCs) and biochemical diagnosis of X-ALD using the same dried blood spots (DBS) routinely used for newborn screening. Methods: LPCs are extracted from 3-mm DBS punch with methanol containing an isotopically labeled LPC as internal standard. This extract is transferred to a 96-well plate, evaporated and then reconstituted in mobile phase for flow injection analysis tandem mass spectrometry (FIA-MS/MS) in selected reaction monitoring mode for measurement of four different LPCs (C20, C22, C24, C26) and the internal standard (d4-C26-LPC). Analysis time is 1.5min per sample. Results: The mean CVs from the intra- and inter-assay experiments for LPCs were 6.3-15.1% for C20-LPC, 4.4-18.6% for C22-LPC and 4.5-14.3% for C24-LPC. Limits of detection were determined for C20-LPC (LOD=0.03μg/mL), C22-LPC (0.03μg/mL), C24-LPC (0.03μg/mL) and C26-LPC (0.01μg/mL). Reference ranges were established from DBS of 130 newborns and 20 adults. Samples of patients with X-ALD (n=16), peroxisomal biogenesis disorders (n=8), and X-ALD carriers (n=12) were analyzed blindly and all were correctly identified. Conclusion: Analysis of LPC species by FIA-MS/MS is a fast, simple and reliable method to screen for X-ALD and other peroxisomal disorders in DBS. To maximize specificity, abnormal results can be verified by a 2nd tier assay using LC-MS/MS.

Original languageEnglish (US)
Pages (from-to)46-50
Number of pages5
JournalMolecular Genetics and Metabolism
Volume114
Issue number1
DOIs
StatePublished - Jan 1 2015

Keywords

  • Dried blood spot
  • Lysophosphatidylcholine
  • Newborn screening
  • Peroxisomes
  • Tandem mass spectrometry
  • X-linked adrenoleukodystrophy

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Biochemistry
  • Molecular Biology
  • Genetics
  • Endocrinology

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    Turgeon, C. T., Moser, A. B., Mørkrid, L., Magera, M. J., Gavrilov, D. K., Oglesbee, D., Raymond, K., Rinaldo, P., Matern, D., & Tortorelli, S. (2015). Streamlined determination of lysophosphatidylcholines in dried blood spots for newborn screening of X-linked adrenoleukodystrophy. Molecular Genetics and Metabolism, 114(1), 46-50. https://doi.org/10.1016/j.ymgme.2014.11.013