Human DNA polymerase (intracellular) (None (see specific polymerases: Pol α, Pol β, Pol δ, Pol ε, Pol λ, Pol μ, Pol ζ))

Human intracellular DNA polymerases are a family of essential enzymes responsible for synthesizing DNA using deoxyribonucleotides as substrates during both DNA replication and repair. Each polymerase has specialized functions: for example, DNA polymerase alpha (Pol α) initiates replication by synthesizing RNA-DNA primers, DNA polymerase delta (Pol δ) and epsilon (Pol ε) perform bulk DNA synthesis on lagging and leading strands, respectively, while DNA polymerase beta (Pol β), lambda (Pol λ), and mu (Pol μ) play key roles in various DNA repair pathways such as base excision repair and non-homologous end joining[1][2][3][5][7]. These enzymes are characterized by highly conserved structural domains (palm, fingers, and thumb) and high substrate specificity[1][2][3]. Some are targets for approved drugs, especially certain nucleoside analogs used in chemotherapy, which exploit their central role in DNA synthesis to block cell proliferation[2]. Dysfunction or mutation in specific DNA polymerase genes has been implicated in cancer, immunodeficiencies, and other disease processes due to compromised genome integrity or defective repair mechanisms[5][7]. Because "human intracellular DNA polymerases" encompasses multiple genes/proteins with distinct molecular characteristics, drugs, and disease associations, structured annotations should be made for each polymerase individually rather than as a group.

Other names

Eukaryotic DNA polymeraseDNA-dependent DNA polymeraseHuman DNA polymerases (generic)Family names: Pol α, Pol β, Pol δ, Pol ε, Pol ζ, Pol η, Pol κ, Pol ι, Pol μ, Pol λ, Pol θ, etc.

Inhibitors block DNA chain elongation by competing with or mimicking natural nucleotides or by binding to the active site of the enzyme (e.g., aphidicolin occludes nucleotide binding). Some drugs act as chain terminators (e.g., cytarabine is incorporated into DNA and terminates elongation)