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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Plasma chitotriosidase activity versus plasma glucosylsphingosine in wide spectrum of Gaucher disease phenotypes - A statistical insight.
Molecular Genetics and Metabolism 2018 April
Deficiency of beta-glucocerebrosidase (GBA) leads to Gaucher disease (GD), an inherited disorder characterised by storage of glucosylceramide (GlcCer) in lysosomes of tissue macrophages. Macrophages activated by accumulated GlcCer secrete chitotriosidase. Plasma chitotriosidase activity is significantly elevated in patients with active GD and has been suggested to indicate total body Gaucher cell load. There are two biomarkers used to assess the severity of GD - chitotriosidase has been measured for over 20 years, and deacylated GlcCer, known as glucosylsphingosine (GlcSph) is thought to be even more adequate, as it is almost a direct storage substrate. In this paper we focused entirely on statistical analysis, performing a thorough search of possible relations, dependencies and differences in the levels of these two biomarkers in a cohort of 64 Polish GD patients. We found that the treatment of GD with enzyme replacement therapy (ERT) changes the distribution of the disease biomarkers; their levels follow a normal distribution only in untreated patients. The variable "disease biomarker level" was found dependent of the binary variable "treated with ERT or not". It was found independent of the following variables: "disease type", "splenectomized or not", and "heterozygous for 24-bp duplication for CHIT1 variant" or "CHIT1 wild type". An almost perfect linear correlation (coefficient of determination R2 = 0.99) between the chitotriosidase activity and GlcSph level was revealed in splenectomized patients.
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