{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nGBA1 encodes the lysosomal enzyme glucocerebrosidase, which is responsible for catalyzing the hydrolysis of the glycolipid glucocerebroside into ceramide and glucose, a reaction central to cellular lipid metabolism and lysosomal homeostasis. Structural and biochemical analyses of GBA1—and the myriad mutations affecting its folding, trafficking, and catalytic efficiency—have demonstrated how loss‐of‐function or misfolding leads to substrate accumulation in Gaucher disease, where clinical presentations vary widely. Such investigations have established the fundamental role of GBA1 in maintaining lysosomal function and underscored how its dysfunction can precipitate multisystemic disease manifestations."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "7"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nBeyond its essential role in glycosphingolipid catabolism, GBA1 mutations have emerged as the most common genetic risk factor for Parkinson’s disease (PD) and related Lewy body disorders. Numerous population‐based and familial studies have documented an increased frequency of pathogenic or risk‐associated GBA1 variants in diverse cohorts, with carriers showing an earlier age at onset, accelerated motor progression, and greater cognitive decline. These clinical investigations support the notion that impaired glucocerebrosidase function disrupts normal lysosomal degradation pathways, thereby contributing to the accumulation of α‐synuclein and fostering a cascade of neurodegenerative events."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "8", "end_ref": "26"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAt the cellular level, a growing body of mechanistic studies indicates that loss of glucocerebrosidase activity compromises key processes such as autophagy, lysosomal reformation, and mitochondrial quality control. Reduced GBA1 function impairs the clearance of misfolded proteins, notably fostering the accumulation and aggregation of α‐synuclein. Moreover, evidence suggests a bidirectional relationship whereby α‐synuclein itself can interfere with glucocerebrosidase trafficking and activity, thereby establishing a feed‐forward loop that exacerbates cellular stress and neurodegeneration. In parallel, experimental approaches utilizing pharmacological chaperones and enzyme enhancement strategies have shown promise in restoring GBA1 activity and alleviating downstream cellular pathology, thus opening new avenues for targeted therapeutic interventions in PD and related disorders."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "27", "end_ref": "39"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Pramod K Mistry, Sandra Sirrs, Alicia Chan, et al. 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