| Here we show that poly ( ADP ribose ) polymerase 1 ( Parp 1 ) forms a complex with OAZ and positively regulates BMP target genes , Xenopus Vent 2 and mouse Smad 6 genes . 0.82690018^^^ Both wild type and the mutant forms of Parp 1 , which is deficient in poly ( ADP ribose ) polymerase activity , constitutively interact with OAZ ; however , the mutant Parp 1 did not activate transcription . 0.78961168^^^ |