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Synaptic proteostasis in Parkinson's disease. Nachman Eliana,Verstreken Patrik Current opinion in neurobiology There are over 7 million people worldwide suffering from Parkinson's disease, and this number will double in the next decade. Causative mutations and risk variants in >20 genes that predominantly act at synapses have been linked to Parkinson's disease. Synaptic defects precede neuronal death. However, we are only now beginning to understand which molecular mechanisms contribute to this synaptic dysfunction. In this review, we discuss recent data demonstrating that Parkinson proteins act centrally to various protein quality control pathways at the synapse, and we argue that disturbed synaptic proteostasis is an early driver of neurodegeneration in Parkinson's disease. 10.1016/j.conb.2021.09.001