PINK1 and Parkinson disease: 32,33 As described above, gut microbiota alterations, such as an expansion in Enterobacteriaceae and Verrucomicrobia, have been implicated in PD.25 This raises the possibility that microbiota differences between wild-type (WT) and Pink1−/- mice, either before, during, or after infection could be implicated in the infection-induced PD-like phenotypes observed.