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

AbstractBACKGROUND:
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.
AuthorsColeman T Turgeon, Ann B Moser, Lars Mørkrid, Mark J Magera, Dimitar K Gavrilov, Devin Oglesbee, Kimiyo Raymond, Piero Rinaldo, Dietrich Matern, Silvia Tortorelli
JournalMolecular genetics and metabolism (Mol Genet Metab) Vol. 114 Issue 1 Pg. 46-50 (Jan 2015) ISSN: 1096-7206 [Electronic] United States
PMID25481105 (Publication Type: Journal Article, Validation Study)
CopyrightCopyright © 2014 Elsevier Inc. All rights reserved.
Chemical References
  • Lysophosphatidylcholines
Topics
  • Adrenoleukodystrophy (blood)
  • Adult
  • Chromatography, Liquid
  • Dried Blood Spot Testing
  • High-Throughput Screening Assays
  • Humans
  • Infant, Newborn
  • Limit of Detection
  • Lysophosphatidylcholines (blood)
  • Neonatal Screening (methods)
  • Peroxisomal Disorders (blood)
  • Reference Values
  • Tandem Mass Spectrometry (methods)

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