The function of WDHD1 (WD repeat and HMG-box DNA binding protein 1, Ensembl gene identifier ENSG00000198554) is as follows. Core replisome component that acts as a replication initiation factor. Binds directly to the CMG complex and functions as a hub to recruit additional proteins to the replication fork. {ECO:0000269|PubMed:19805216, ECO:0000269|PubMed:34694004, ECO:0000269|PubMed:35585232}.