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The link between the GBA gene and parkinsonism
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Journal Article
The link between the GBA gene and parkinsonism
2012
Overview
Mutations in the glucocerebrosidase (GBA) gene, which encodes the lysosomal enzyme that is deficient in Gaucher's disease, are important and common risk factors for Parkinson's disease and related disorders. This association was first recognised in the clinic, where parkinsonism was noted, albeit rarely, in patients with Gaucher's disease and more frequently in relatives who were obligate carriers. Subsequently, findings from large studies showed that patients with Parkinson's disease and associated Lewy body disorders had an increased frequency of GBA mutations when compared with control individuals. Patients with GBA-associated parkinsonism exhibit varying parkinsonian phenotypes but tend to have an earlier age of onset and more associated cognitive changes than patients with parkinsonism without GBA mutations. Hypotheses proposed to explain this association include a gain-of-function due to mutations in glucocerebrosidase that promotes α-synuclein aggregation; substrate accumulation due to enzymatic loss-of-function, which affects α-synuclein processing and clearance; and a bidirectional feedback loop. Identification of the pathological mechanisms underlying GBA-associated parkinsonism will improve our understanding of the genetics, pathophysiology, and treatment for both rare and common neurological diseases.
Publisher
Elsevier Ltd,Elsevier Limited
