Transcription cofactor (PubMed:30097457). Negatively regulates transcription activation by catenin beta-1 CTNNB1, perhaps acting by competing with TCF4 for CTNNB1 binding (PubMed:30097457). May play a role in DNA-damage response signaling (PubMed:33924684). Binds specifically to DNA sequences at peri-centromeric chromatin loci. {ECO:0000269|PubMed:30097457, ECO:0000269|PubMed:33924684, ECO:0000269|PubMed:34408139}. This is the function of FLYWCH1 (FLYWCH-type zinc finger 1, Ensembl gene identifier ENSG00000059122).