Acts as an epigenetic regulator of myogenesis in cooperation with DPF3a (isoform 2 of DPF3/BAF45C) (PubMed:32459350). Associates with the BAF complex via its interaction with DPF3a and HDGFL2-DPF3a activate myogenic genes by increasing chromatin accessibility through recruitment of SMARCA4/BRG1/BAF190A (ATPase subunit of the BAF complex) to myogenic gene promoters (PubMed:32459350). Promotes the repair of DNA double-strand breaks (DSBs) through the homologous recombination pathway by facilitating the recruitment of the DNA endonuclease RBBP8 to the DSBs (PubMed:26721387). Preferentially binds to chromatin regions marked by H3K9me3, H3K27me3 and H3K36me2 (PubMed:26721387, PubMed:32459350). Involved in cellular growth control, through the regulation of cyclin D1 expression (PubMed:25689719). Interacts with HDGF (By similarity). Interacts with trimethylated 'Lys-36' of histone H3 (H3K36me3). Interacts with trimethylated 'Lys-79' of histone H3 (H3K79me3), but has higher affinity for H3K36me3. Interacts with IWS1 (PubMed:25689719). Interacts with H2AX, POGZ, RBBP8 and CBX1 (PubMed:26721387). Interacts with histones H3K9me3, H3K27me3 and H3K36me2 (PubMed:26721387, PubMed:32459350). Interacts with DPF3a (isoform 2 of DPF3/BAF45C) (PubMed:32459350). Interacts with SMARCA4/BRG1/BAF190A, SMARCC1/BAF155 and SMARCD1/BAF60A in a DPF3a-dependent manner (PubMed:32459350). Widely expressed. High expression is found in heart, skeletal muscle, ovary and testis. Overexpression is frequently observed in hepatocellular carcinoma samples. Belongs to the HDGF family.