dna bases

What Is the Role of DNA Repair Mechanisms?

The body has several DNA repair mechanisms to fix damage caused by toxic agents. These include:
Base excision repair (BER) - Corrects small, non-helix-distorting base lesions.
Nucleotide excision repair (NER) - Repairs bulky, helix-distorting lesions.
Mismatch repair (MMR) - Fixes base-pairing mismatches that occur during DNA replication.
Homologous recombination (HR) and non-homologous end joining (NHEJ) - Repair double-strand breaks.

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