Component of the Integrator (INT) complex, a complex involved in the small nuclear RNAs (snRNA) U1 and U2 transcription and in their 3'-box-dependent processing. The Integrator complex is associated with the C-terminal domain (CTD) of RNA polymerase II largest subunit (POLR2A) and is recruited to the U1 and U2 snRNAs genes. Mediates recruitment of cytoplasmic dynein to the nuclear envelope, probably as component of the INT complex. Belongs to the multiprotein complex Integrator, at least composed of INTS1, INTS2, INTS3, INTS4, INTS5, INTS6, INTS7, INTS8, INTS9/RC74, INTS10, INTS11/CPSF3L and INTS12 (By similarity). Interacts with ESRRB, ESRRB is probably not a core component of the multiprotein complex Integrator and this association is a bridge for the interaction with the multiprotein complex Integrator; attracts the transcriptional machinery (PubMed:26206133). Could be due to alternative splicing but with non canonical splice junction. Extended N-terminus.