These includes Leucine-Rich Repeat Kinase 2 (LRRK2), which is a monogenic genetic cause of PD [71]; PTEN-Induced Putative Kinase 1 (PINK1), linked to familial PD with autosomal recessive inheritance [72]; PARKIN (PRKN), common in patients with early-onset PD [73]; and DJ-1, which is found in the familial recessive form of PD [74]. The gene discussed is LRRK2; the disease is Parkinson disease.