Expression of many of the genes involved in a number of innate immune signaling pathways (in particular, in the canonical NFκB, non-canonical NFκB, the TNFα/NFκB, IL6/STAT3, IL2/STAT5 pathways, as well as the IFNγ and IFNα response) in cells from PD patients was found to be reduced compared to that in the cells from healthy donors. Here, IFNG is linked to Parkinson disease.