Plays an important role in the ligand-dependent activation of estrogen receptor target genes. May play a role in the silencing of fetal globin genes. Recruits the 5FMC complex to ZNF148, leading to desumoylation of ZNF148 and subsequent transactivation of ZNF148 target genes. Required for the tumorigenicity of glioblastoma cells. Binds to 5-hydroxymethylcytosine (5hmC) and associates with the methylosome complex containing PRMT1, PRMT5, MEP50 and ERH. The CHTOP-methylosome complex associated with 5hmC methylates H4R3 and transactivates genes involved in glioblastomagenesis (By similarity). Interacts with PRMT1 and PRMT5. Interacts with the 5FMC complex; the interaction is methylation-dependent. Interacts with FYTTD1, SET and PRC1 complex members CBX4, RNF2 and PHC2; the interactions are methylation-independent. Interacts with ZNF148. Interacts with WDR77 and ER (By similarity). Mostly associated with facultative heterochromatin (By similarity). Localizes to regions surrounding nuclear speckles known as perispeckles in which TREX complex assembly seems to occur (By similarity). Asymmetrically methylated by PRMT1. Symmetrically methylated by PRMT5 (By similarity).