The formation of an AP site, a deoxyribose sugar with a missing base, by DNA glycosylase which recognizes an altered base in DNA and catalyzes its hydrolytic removal. This sugar phosphate is the substrate recognized by the AP endonuclease, which cuts the DNA phosphodiester backbone at the 5' side of the altered site to leave a gap which is subsequently repaired.
base-excision repair, gap-filling
chromosomal 5-methylcytosine DNA demethylation pathway +
DNA biosynthetic process +
DNA catabolic process +
DNA damage tolerance +
DNA double-strand break processing +
DNA integration
DNA modification +
DNA protection
DNA recombination +
DNA repair +
DNA replication +
DNA replication initiation +
DNA replication termination +
DNA replication, Okazaki fragment processing +
DNA strand displacement +
DNA strand elongation +
DNA strand invasion +
DNA strand resection involved in replication fork processing +
DNA topological change
DNA-templated DNA replication maintenance of fidelity +
formation of extrachromosomal circular DNA +
G-quadruplex DNA formation
gap filling involved in double-strand break repair via nonhomologous end joining