Deoxyadenosine triphosphate (dATP) is a nucleotide used in cells for DNA synthesis (or replication), as a substrate of DNA polymerase. Findings have also suggested that dATP can act as an energy-transferring molecule to maintain cell viability. Deoxyadenosine triphosphate (dATP) is a nucleotide used in cells for DNA synthesis (or replication), as a substrate of DNA polymerase. Findings have also suggested that dATP can act as an energy-transferring molecule to maintain cell viability.