Abstract
Glucocerebrosidase (GCase), which is encoded by the GBA1 gene, has lysosomal glycoside hydrolase activity that hydrolyzes glucosylceramide. Defects in GCase lead to the accumulation of glucosylceramide, which causes the development of the lysosomal storage disease known as Gaucher's disease. Loss-of-function mutations in the GBA1 gene are the most important genetic risk factor for synucleinopathies, such as Parkinson's disease and dementia with Lewy bodies. Recent studies on PD genes associated with lysosomal function suggest that GCase activity is decreased in cell models of PD and in neurons derived from PD patients. In this chapter, we describe a protocol to measure GCase activity in cultured cells.
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