Parkinson's disease is a chronic and progressive neurodegenerative disorder affecting millions of people worldwide. The disease is characterized by the loss of dopaminergic neurons in the substantia nigra, which leads to a decline in motor function and other symptoms such as tremors, rigidity, and bradykinesia. Although the exact cause of Parkinson's disease is unknown, research has suggested that oxidative stress, protein misfolding, mitochondrial dysfunction, and neuroinflammation may play a role in its pathophysiology. One protein that has been implicated in the disease modification of Parkinson's is DJ-1. DJ-1 is a protein that plays a crucial role in the regulation of oxidative stress and cellular survival. Mutations in the DJ-1 gene have been associated with the onset of Parkinson's disease. Recent studies have demonstrated that DJ-1 may have a disease-modifying effect on Parkinson's disease by protecting dopaminergic neurons against oxidative stress and other cellular insults. The pathophysiology of Parkinson's disease involves the accumulation of misfolded proteins, particularly alpha-synuclein, which forms Lewy bodies in the brain. These protein aggregates contribute to the death of dopaminergic neurons and the progression of the disease. DJ-1 has been shown to interact with alpha-synuclein and prevent its aggregation, thus reducing its neurotoxicity. Additionally, DJ-1 may also enhance autophagy, the process by which damaged proteins and organelles are removed from cells, further reducing the burden of protein misfolding and aggregation. In addition to its neuroprotective role, DJ-1 may also be involved in the regulation of neuroinflammation, another key feature of Parkinson's disease. Neuroinflammation is characterized by the activation of glial cells, which release pro-inflammatory cytokines and chemokines, leading to the death of dopaminergic neurons. DJ-1 has been shown to modulate the activation of glial cells and reduce the release of pro-inflammatory cytokines, thus attenuating neuroinflammation. Overall, DJ-1 may have a disease-modifying effect on Parkinson's disease by protecting dopaminergic neurons against oxidative stress and protein misfolding, preventing the aggregation of alpha-synuclein, enhancing autophagy, and regulating neuroinflammation. The role of DJ-1 in Parkinson's disease is an active area of research, and further studies are needed to fully understand its mechanisms and potential as a therapeutic target for the disease.