Transcription factor, which activates RAG1, and possibly RAG2, transcription. Through the regulation of RAG1/2 expression, may regulate thymocyte maturation. Along with NIPBL and the multiprotein complex Integrator, promotes cortical neuron migration during brain development by regulating the transcription of crucial genes in this process. Preferentially binds promoters containing paused RNA polymerase II. Up-regulates the expression of SEMA3A, NRP1, PLXND1 and GABBR2 genes, among others. Involved in the regulation of myoblast proliferation during myogenesis. Interacts (via N-terminus) with NIPBL. Interacts with the multiprotein complex Integrator. Isoform 1: Expressed in myoblasts and myotubes. Isoform 2: Expressed in myoblasts and myotubes, with a preference in undifferentiated myoblasts. Isoform 1: Up-regulated during neuronal differentiation in retinoic acid-treated SH-SY5Y cells (PubMed:25921068). Isoform 2: Down-regulated during myogenesis (PubMed:28344082). Produced by a back-splicing reaction which joins the 5'-splice site of the first coding exon with the 3'-splice site of the upstream intron resulting in a circular RNA, called circ-ZNF609. The translation starts with the same initiator methionine as that of the linear transcript encoding isoform 1. The stop codon is created upon circularization. Round in circles - Issue 199 of January 2018