As mentioned above, mutations in SYNJ1 itself are known risk factors for PD (Krebs et al., 2013; Quadri et al., 2013; Olgiati et al., 2014; Ben Romdhan et al., 2018; Schechter and Sharon, 2021), however, whether this is also the case for DLB is still unclear. The gene discussed is SYNJ1; the disease is Parkinson disease.