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Nucleotide Excision Repair01:38

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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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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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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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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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XPC: Going where no DNA damage sensor has gone before.

Leah Nemzow1, Abigail Lubin1, Ling Zhang1

  • 1Department of Biochemistry and Molecular Biology, University of Miami Miller, School of Medicine Miami, FL 33136, United States.

DNA Repair
|October 1, 2015
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Summary

The XPC protein, crucial for DNA repair, also plays vital roles in cell signaling and viability beyond its canonical DNA damage recognition functions. This review explores XPC

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BERDNA repairGG-NERNucleotide excision repairRad4XPC

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cellular Biology

Background:

  • The XPC protein is traditionally recognized for its essential role in DNA damage recognition within the global genome nucleotide excision repair (GG-NER) pathway.
  • This function is critical for maintaining genomic stability and organismal health by initiating the repair of DNA lesions.
  • Recent studies indicate XPC involvement extends beyond its canonical DNA repair functions.

Purpose of the Study:

  • To review the established role of XPC in DNA damage recognition and GG-NER.
  • To explore and highlight the emerging non-canonical functions of XPC.
  • To underscore the expanding understanding of XPC's influence on cellular regulation.

Main Methods:

  • Literature review of canonical and non-canonical XPC functions.
  • Synthesis of findings from recent research on XPC pathways.
  • Comparative analysis of XPC's roles in DNA repair and other cellular processes.

Main Results:

  • XPC is confirmed as a key player in GG-NER, recognizing DNA lesions to initiate repair.
  • XPC participates in diverse non-canonical pathways, including base excision repair (BER), chromatin remodeling, cell signaling, and proteolytic degradation.
  • Evidence suggests XPC significantly impacts cellular viability and overall cellular regulation.

Conclusions:

  • XPC's role in cellular regulation is far more extensive than previously understood.
  • The non-canonical functions of XPC are critical for maintaining cellular homeostasis.
  • Further research into XPC's multifaceted roles is warranted to fully appreciate its biological significance.