DICER1 and Parkinson disease: Downregulation of Dicer has been implicated in neurodegenerative diseases including neuropsychiatric disorders such as chronic stress and depression (Dias et al., 2014; Wingo et al., 2015), multiple sclerosis (MS) (Aung and Balashov 2015; Magner et al., 2016) and Parkinson’s Disease (PD) (Simunovic et al., 2010).