PARK7 and Parkinson disease: Analysis of the expression of the Protein deglycase DJ-1 (PARK7) gene, responsible for the synthesis of the DJ-1 protein, and the lymphocyte activation gene 3 (LAG3) receptor gene in lymphocytes has shown a decrease in the expression of the former (Figure 10A) and an increase in the expression of the latter in patients at risk of developing PD, compared with the controls (Figure 10B).