Excision repair involves removal of a damaged nucleotide by dual incisions bracketing the lesion; this is accomplished by a multisubunit enzyme referred to as the excision nuclease or excinuclease.

How many types of excision repairs are there?

Three different types of excision repair have been characterized: nucleotide excision repair, base excision repair, and mismatch repair.

What does base excision repair?

Base excision repair (BER) corrects DNA damage from oxidation, deamination and alkylation. ... BER is initiated by a DNA glycosylase that recognizes and removes the damaged base, leaving an abasic site that is further processed by short-patch repair or long-patch repair that largely uses different proteins to complete BER.