parkinsons - tlooto, The Most Powerful AcademicGPT

Parkinson’s disease (PD) is a progressive neurodegenerative disorder characterized clinically by a combination of motor and non-motor features, primarily resulting from the loss of dopaminergic neurons in the substantia nigra pars compacta. While PD is classically recognized by its motor symptoms—bradykinesia, resting tremor, rigidity, and postural instability—a spectrum of non-motor symptoms, such as sleep disturbances, cognitive decline, mood disorders, autonomic dysfunction, and sensory phenomena, precedes or accompanies motor manifestations, often affecting quality of life substantially [1]. Etiology and Pathogenesis PD arises from a complex interplay of genetic, environmental, and age-related factors. Monogenic forms, due to mutations in genes such as SNCA, LRRK2, PARK2, PINK1, and DJ-1, account for only 3–5% of cases, while the heritability of idiopathic PD involves more than 90 genetic risk variants that collectively explain 16–36% of risk [1]. Environmental risk factors include