Host DNA polymerases (DNA Pol)

Host DNA polymerases are a fundamental class of enzymes responsible for the synthesis of DNA molecules by assembling nucleotides according to a template strand. In humans, these enzymes are categorized into several families (A, B, X, and Y), with specific members such as Polymerase alpha, delta, and epsilon primarily handling nuclear genome replication, while Polymerase gamma manages mitochondrial DNA synthesis (Nature Education, 2014, DNA Replication). Beyond replication, they are essential for maintaining genomic integrity through various DNA repair pathways, including base excision and mismatch repair (PubMed, PMID: 21119644). In oncology, host DNA polymerases are targeted by antimetabolite drugs like Cytarabine and Gemcitabine, which mimic natural nucleotides to disrupt DNA synthesis in rapidly proliferating cancer cells (PubChem, CID 6253). However, these enzymes also represent a significant site for off-target toxicity; for instance, the inhibition of mitochondrial DNA polymerase gamma by certain antiviral nucleoside analogs can lead to severe adverse effects such as lactic acidosis and organ failure (NIH, LiverTox, 2012). Mutations in specific host polymerases, particularly POLE and POLD1, are recognized as critical drivers in certain colorectal and endometrial cancers, often serving as biomarkers for high mutational burden and sensitivity to immunotherapy (PubMed, PMID: 23447504).

Other names

Human DNA polymerasesDNA-directed DNA polymerasesEukaryotic DNA polymerasesReplicative DNA polymerasesRepair DNA polymerases

Inhibition of DNA synthesis through competitive binding with natural deoxyribonucleotide triphosphates (dNTPs) and subsequent incorporation into the nascent DNA strand, leading to premature chain termination or stalling of the replication fork.