CDC73Cell division cycle 73, Paf1/RNA polymerase II complex component, homolog , also known as CDC73 and parafibromin, is a protein which in humans is encoded by the CDC73 gene.FunctionParafibromin, LEO1, PAF1, and CTR9 form the PAF protein complex, which associates with the RNA polymerase II subunit POLR2A and with a histone methyltransferase complex.Clinical significanceMutations in the CDC73 gene are associated with hyperparathyroidism-jaw tumor syndrome and parathyroid carcinomas.