BDNF and drug-induced dyskinesia: Other polymorphisms including rs886292 (ABCC8), rs11880894 (RYR1), rs1800497 (DRD2), rs6265 (BDNF), rs11646587, rs7192557 and rs8057394 (GRIN2A) were found to be associated with dyskinesia in patients administered with levodopa medication.