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DNA Damage and Repair Mechanisms

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Thymine Dimers

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Nucleotide Excision Repair (NER) is used to remove bulky lesions like thymine dimers caused by UV radiation.

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DNA crosslinking (Intrastrand)

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NER also addresses intrastrand crosslinks, such as those induced by cisplatin, through excision of a DNA segment containing the crosslink.

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DNA crosslinking (Interstrand)

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Interstrand crosslink repair is a complex process, possibly involving NER, Translesion Synthesis (TLS), and HR to resolve the crosslink without causing a DSB.

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Mismatched Bases

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Mismatch Repair (MMR) corrects base-bair mismatches post DNA replication that have escaped proofreading.

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Double-Strand Break (DSB) - Alternative

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Non-Homologous End Joining (NHEJ) repairs breaks by directly ligating the broken ends together, which may result in loss of nucleotides at the break site.

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Ribonucleotide incorporation

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Ribonucleotide Excision Repair (RER) involves the removal of ribonucleotides that have been mistakenly incorporated into DNA during replication.

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Single-Strand Break (SSB)

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Base Excision Repair (BER) is primarily involved in repairing single-strand breaks by replacing a single nucleotide.

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Double-Strand Break (DSB)

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Homologous Recombination (HR) repair uses a sister chromatid to repair breaks without loss of genetic information.

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Alkylating Damage

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Direct Repair mechanisms, like O^6-methylguanine DNA methyltransferase (MGMT), remove alkyl groups from guanine bases without breaking the DNA strand.

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Oxidative Damage

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BER also corrects oxidative DNA damage by replacing damaged bases often caused by reactive oxygen species.

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