The core principle of proofreading mechanisms in DNA replication is the kinetic competition between nucleotide incorporation and excision, governed by the fidelity requirements of the central dogma of molecular biology. This mechanism operates as a proof-reading subfield of polymerase catalysis, utilizing a exonucleolytic editing function to thermodynamically reverse non-canonical base pairing errors immediately post-incorporation. Formally defined by the ratio of incorporation ($k_{pol}$) to excision ($k_{exo}$) rates, the process ensures replication accuracy by reducing the error frequency to approximately $10^{-9}$ per base pair, independent of the Watson-Crick hydrogen bonding specificity of the parental template.
DNA replication proofreading mechanisms function through a kinetic selectivity principle wherein polymerase fidelity is enhanced by both thermodynamic discrimination and enzymatic editing at the acti…