Abstract | INTRODUCTION: OBJECTIVES: This study aims to develop a simple, effective and accurate method for the screening and diagnosis of GD using dried blood spot (DBS) samples. METHODS: Lyso-Gb1 in DBS was extracted by 50% acetonitrile aqueous solution containing isotope-labeled internal standard and analyzed using liquid chromatography tandem mass spectrometry (LC-MS/MS). A reference interval was established by analyzing samples from 277 healthy controls. Lyso-Gb1 was detected in the residual DBS samples from 142 high-risk patients with splenomegaly and/or thrombocytopenia. Based on GCase activity in DBS, samples were classified into four groups: confirmed GD patients (n = 52), GD carriers (n = 5), false positive (n = 36) and negative (n = 49). RESULTS: The optimized Lyso-Gb1 assay showed intra- and inter-assay variations ranged between 2.0%-8.2% and 3.8%-10.2%, respectively. Accuracies ranged from 93.5% to 112.6%. The lowest limit of quantification was 1 ng/mL. The normal reference interval of Lyso-Gb1 in DBS ranged from 2.1 to 9.9 ng/mL. Among the 142 subjects, except for one GD patient (Lyso-Gb1 > 2500 ng/mL), the Lyso-Gb1 concentrations in 51 GD patients ranged from 190.5 to 2380.6 ng/mL (the median 614.8 ng/mL). Also, one negative patient was found to have an elevated Lyso-Gb1 level (684.5 ng/mL), while the other patients were normal. The negative case was then confirmed to be an atypical GD patient with a c.1091A > G (p.Y364C) homozygous variant in PSAP gene by next generation sequencing. CONCLUSIONS: The optimized method to determine Lyso-Gb1 in DBS was demonstrated as a useful tool for the screening and diagnosis of GD.
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Authors | Chengfang Tang, Xuefang Jia, Fang Tang, Sichi Liu, Xiang Jiang, Xiaoyuan Zhao, Huiying Sheng, Minzhi Peng, Li Liu, Yonglan Huang |
Journal | Clinical biochemistry
(Clin Biochem)
Vol. 87
Pg. 79-84
(Jan 2021)
ISSN: 1873-2933 [Electronic] United States |
PMID | 33188770
(Publication Type: Journal Article)
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Copyright | Copyright © 2020 The Canadian Society of Clinical Chemists. Published by Elsevier Inc. All rights reserved. |
Chemical References |
- Biomarkers
- Psychosine
- sphingosyl beta-glucoside
- beta-Glucosidase
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Topics |
- Adolescent
- Adult
- Biological Assay
- Biomarkers
(blood)
- Case-Control Studies
- Child
- Child, Preschool
- Chromatography, Liquid
(methods)
- Dried Blood Spot Testing
(methods)
- Female
- Gaucher Disease
(blood, diagnosis)
- Humans
- Infant
- Infant, Newborn
- Male
- Middle Aged
- Psychosine
(analogs & derivatives, blood)
- Reference Values
- Tandem Mass Spectrometry
(methods)
- Young Adult
- beta-Glucosidase
(metabolism)
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