ZNF639 is a 485 amino acid protein that localizes to the nucleus and contains five C2H2-type zinc fingers. One of several members of the Krueppel C2H2-type zinc-finger family, ZASC1 is thought to be involved in transcriptional regulation. The gene encoding ZASC1 maps to human chromosome 3, which houses over 1,100 genes, including a chemokine receptor (CKR) gene cluster and a variety of human cancer-related gene loci. Key tumor suppressing genes on chromosome 3 include those that encode the apoptosis mediator RASSF1, the cell migration regulator HYAL1 and the angiogenesis suppressor SEMA3B. Marfan Syndrome, porphyria, von Hippel-Lindau syndrome, osteogenesis imperfecta and Charcot-Marie-Tooth Disease are a few of the numerous genetic diseases associated with chromosome 3.