GRM5 and Parkinson disease: By qPCR, levels of mRNA were comparable between DLB, PD and control cases (Figure S3A) non-tg and PDGF- and mThy1-alpha-syn tg mice (Figure S3B), suggesting that transcriptional events are not involved and that the interaction between alpha-syn and mGluR5 occurs post-transcription/post-translationally.