MED9 (Mediator Complex Subunit 9) is a Protein Coding gene. Among its related pathways are Metabolism and Regulation of lipid metabolism by Peroxisome proliferator-activated receptor alpha (PPARalpha). The multiprotein Mediator complex is a coactivator required for activation of RNA polymerase II transcription by DNA bound transcription factors. The protein encoded by MED9 is thought to be a subunit of the Mediator complex. MED9 is located within the Smith-Magenis syndrome region on chromosome 17.