Transcriptional coactivator in the bone morphogenetic protein (BMP)-signaling pathway. It positively modulates BMP signaling by interacting with SMAD1 and associating with CBP in the transcription complex. It contributes to the BMP-induced enhancement of cholinergic-neuron-specific gene expression. Interacts with SMAD1 and CREB-binding protein (CBP). Forms a protein-DNA complex through its association with SMAD1. In embryonic brains expression is restricted to the ventral region of the forebrain, including the septum, amygdala, caudal putamen, and in the basal-forebrain cholinergic neurons. In adults, expressed in the brain, and at low levels in the testis. Belongs to the ZCCHC12 family.