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Related Concept Videos

Nucleotide Excision Repair01:38

Nucleotide Excision Repair

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DNA Distortion and Damage
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
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Overview of DNA Repair02:25

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In order to be passed through generations, genomic DNA must be undamaged and error-free. However, every day, DNA in a cell undergoes several thousand to a million damaging events by natural causes and external factors. Ionizing radiation such as UV rays, free radicals produced during cellular respiration, and hydrolytic damage from metabolic reactions can alter the structure of DNA. Damages caused include single-base alteration, base dimerization, chain breaks, and cross-linkage.
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Long-patch Base Excision Repair01:02

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Since the discovery of the two BER pathways, there has been a debate about how a cell chooses one pathway over the other and the factors determining this selection. Numerous in vitro experiments have pointed out multiple determinants for the sub-pathway selection. These are:
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Base Excision Repair01:54

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One of the common DNA damages is the chemical alteration of single bases by alkylation, oxidation, or deamination. The altered bases cause mispairing and strand breakage during replication. This type of damage causes minimal change to the DNA double helix structure and can be repaired by the base excision repair (BER) pathways. BER corrects damaged DNA sequences by removing the damaged base and restoring the original base sequence using the complementary strand as a template.
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Homologous Recombination02:31

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The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
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Visualizing and Quantifying Endonuclease-Based Site-Specific DNA Damage
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SnapShot: DNA repair pathways.

Aki Nunomiya1, Barnabas Szakal1, Dana Branzei2

  • 1IFOM ETS, the AIRC Institute of Molecular Oncology, Milan, Italy.

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Summary
This summary is machine-generated.

Cells constantly repair DNA damage from internal and external sources using multiple, conserved pathways. This overview details key DNA repair mechanisms, the lesions they target, and their core functions.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • DNA is vital for cellular function and heredity.
  • DNA is susceptible to damage from endogenous and environmental factors.
  • Cells possess sophisticated DNA repair systems to maintain genomic integrity.

Purpose of the Study:

  • To outline the major DNA repair pathways in cells.
  • To identify the primary DNA lesions targeted by each pathway.
  • To describe the key molecular players and transactions involved in DNA repair.

Main Methods:

  • Review and synthesis of established knowledge on DNA repair.
  • Categorization of DNA repair pathways based on lesion type and mechanism.
  • Identification of core enzymes and protein complexes for each pathway.

Main Results:

  • Detailed description of major DNA repair pathways including Base Excision Repair (BER), Nucleotide Excision Repair (NER), Mismatch Repair (MMR), and Double-Strand Break Repair (DSBR).
  • Association of specific DNA lesions (e.g., oxidative damage, bulky adducts, mismatches, double-strand breaks) with their respective repair pathways.
  • Highlighting conserved principles and key molecular players across species.

Conclusions:

  • Multiple, overlapping DNA repair pathways are essential for maintaining genomic stability.
  • Understanding these pathways is crucial for comprehending cellular responses to genotoxic stress.
  • These conserved mechanisms underscore the fundamental importance of DNA repair across all life forms.