SOS repair

SOS re·pair

a system that repairs severely damaged bases in DNA by base excision and replacement, even if there is no template to guide base selection. This process is a last resort for repair and is often the cause of mutations.
Synonym(s): error-prone repair
An error-prone repair system that functions when E coli’s DNA is damaged by bond-breaking physical agents, thymine starvation, toxins, chemicals—e.g., mitomycin C—and UV light