DNA polymerase alpha and DNA polymerase beta (Pol α, Pol β)

DNA polymerase alpha is the enzyme responsible for initiating the synthesis of new DNA strands by producing short RNA-DNA primers during DNA replication. It is a member of the B-family of DNA polymerases and is essential for eukaryotic chromosomal replication[4][6][7]. DNA polymerase beta is a small X-family DNA polymerase involved primarily in base excision repair, catalyzing DNA synthesis and deoxyribose phosphate lyase reactions to repair single-nucleotide gaps and lesions in nuclear DNA[1][5][7][8]. Both enzymes play foundational roles in maintaining genome stability. Alterations in their function or expression are implicated in cancer and other diseases associated with genomic instability[5][7][8][9]. In summary, DNA polymerase alpha and beta should be queried and documented as discrete molecular targets rather than as a combined entity. Their distinct biological functions, disease associations, and classification are well-defined in the scientific literature[4][5][7][9].

Other names

Pol α (DNA polymerase alpha)Pol β (DNA polymerase beta)DNA pol alphaDNA pol beta

Inhibition of DNA synthesis (mostly nucleoside analogs prevent chain elongation); Interference with DNA repair pathways (inhibition of beta function, indirectly increasing DNA damage).