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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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DNA Damage can Stall the Cell Cycle02:37

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In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
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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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Fixing Double-strand Breaks02:04

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The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
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Visualizing and Quantifying Endonuclease-Based Site-Specific DNA Damage
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Visualizing and Quantifying Endonuclease-Based Site-Specific DNA Damage

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DNA Damage Response Mechanisms in Model Systems.

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This summary is machine-generated.

Cells face constant DNA damage threats to genome stability. Understanding these cellular repair mechanisms is crucial for preventing diseases linked to genomic instability.

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Characterizing DNA Repair Processes at Transient and Long-lasting Double-strand DNA Breaks by Immunofluorescence Microscopy
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Characterizing DNA Repair Processes at Transient and Long-lasting Double-strand DNA Breaks by Immunofluorescence Microscopy
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Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • Cells encounter DNA damage from internal and external sources.
  • DNA damage poses a significant threat to genome stability.
  • Maintaining genomic integrity is essential for cellular function and organismal health.

Discussion:

  • This study investigates the cellular responses to DNA damage.
  • Key pathways involved in DNA repair are explored.
  • The implications of impaired DNA repair for disease development are discussed.

Key Insights:

  • Identification of novel factors involved in DNA damage response.
  • Elucidation of mechanisms underlying the maintenance of genome stability.
  • Understanding how cells counteract DNA damage is vital.

Outlook:

  • Future research directions focus on therapeutic strategies targeting DNA repair pathways.
  • Potential applications in cancer treatment and aging research.
  • Further exploration of the complex interplay between DNA damage and cellular fate.