The critical role of psychosine in screening, diagnosis, and monitoring of Krabbe disease.

Published online

Journal Article

PURPOSE: Newborn screening (NBS) for Krabbe disease (KD) is performed by measurement of galactocerebrosidase (GALC) activity as the primary test. This revealed that GALC activity has poor specificity for KD. Psychosine (PSY) was proposed as a disease marker useful to reduce the false positive rate for NBS and for disease monitoring. We report a highly sensitive PSY assay that allows identification of KD patients with minimal PSY elevations. METHODS: PSY was extracted from dried blood spots or erythrocytes with methanol containing d5-PSY as internal standard, and measured by liquid chromatography-tandem mass spectrometry. RESULTS: Analysis of PSY in samples from controls (N = 209), GALC pseudodeficiency carriers (N = 55), GALC pathogenic variant carriers (N = 27), patients with infantile KD (N = 26), and patients with late-onset KD (N = 11) allowed for the development of an effective laboratory screening and diagnostic algorithm. Additional longitudinal measurements were used to track therapeutic efficacy of hematopoietic stem cell transplantion (HSCT). CONCLUSION: This study supports PSY quantitation as a critical component of NBS for KD. It helps to differentiate infantile from later onset KD variants, as well as from GALC variant and pseudodeficiency carriers. Additionally, this study provides further data that PSY measurement can be useful to monitor KD progression before and after treatment.

Full Text

Duke Authors

Cited Authors

  • Guenzel, AJ; Turgeon, CT; Nickander, KK; White, AL; Peck, DS; Pino, GB; Studinski, AL; Prasad, VK; Kurtzberg, J; Escolar, ML; Lasio, MLD; Pellegrino, JE; Sakonju, A; Hickey, RE; Shallow, NM; Ream, MA; Orsini, JJ; Gelb, MH; Raymond, K; Gavrilov, DK; Oglesbee, D; Rinaldo, P; Tortorelli, S; Matern, D

Published Date

  • February 24, 2020

Published In

PubMed ID

  • 32089546

Pubmed Central ID

  • 32089546

Electronic International Standard Serial Number (EISSN)

  • 1530-0366

Digital Object Identifier (DOI)

  • 10.1038/s41436-020-0764-y

Language

  • eng

Conference Location

  • United States