Transcriptional corepressor which facilitates transcriptional repression via its association with DNA-binding transcription factors and recruitment of other corepressors and histone-modifying enzymes. Via association with PRDM14 is involved in regulation of embryonic stem cell (ESC) pluripotency. Involved in primordial germ cell (PCG) formation (PubMed:27281218). Stabilizes PRDM14 and OCT4 on chromatin in a homooligomerization-dependent mannerCan repress the expression of MMP7 in a ZBTB33-dependent manner (By similarity). Through heteromerization with CBFA2T3/MTG16 may be involved in regulation of the proliferation and the differentiation of erythroid progenitors by repressing the expression of TAL1 target genes (PubMed:19799863). Required for the maintenance of the secretory cell lineage in the small intestine (PubMed:16227606). Can inhibit Notch signaling probably by association with RBPJ and may be involved in GFI1-mediated Paneth cell differentiation (PubMed:25398765). Homooligomer. Homotetramerization is mediated by the NHR2 domain. Interacts with CBFA2T3/MTG16 (PubMed:19799863). Can interact with RUNX1T1/CBFA2T1. Heterotetramerization between members of the CBFA2T family is proposed (By similarity). Interacts with RBP, GFI1, TCF4, PRDM14 (PubMed:25398765, PubMed:18039847, PubMed:27281218). Interacts with TAL1 and CBFA2T3/MTG16; the heteromer with CBFA2T3/MTG16 may function in repression of TAL1 (PubMed:19799863). Expressed in embryonic stem cells. First expression detected on embryonic day 11.5. Nervy homology region 2 (NHR2) mediates homo- and possibly heterotypic oligomerization by forming a four-helix bundle tetrameric structure. Required for tumorigenesis in a AOM/DSS colitis-associated carcinoma model. May be involved in intestinal tumorigenesis. Loss of Mtgr1 impairs the maturation of secretory cells in the small intestine. Belongs to the CBFA2T family.