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DNA Damage can Stall the Cell Cycle02:36

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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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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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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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Visualizing and Quantifying Endonuclease-Based Site-Specific DNA Damage
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Deciphering the DNA Damage Response.

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  • 1Department of Biology and Rosenstiel Basic Medical Sciences Research Center, Brandeis University, Waltham, MA 02454, USA.

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Evelyn Witkin and Stephen Elledge won the Lasker Award for their groundbreaking work on the DNA damage response. Their research over 40 years has illuminated how cells repair DNA, a fundamental process for life.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • The DNA damage response (DDR) is crucial for maintaining genomic integrity.
  • Understanding the DDR is vital for comprehending cancer development and aging.

Discussion:

  • Evelyn Witkin's early work identified inducible repair mechanisms in bacteria.
  • Stephen Elledge discovered key signaling pathways and checkpoints in the DDR.
  • Their combined efforts revealed the intricate network cells use to detect and repair DNA damage.

Key Insights:

  • The DDR involves complex signaling cascades that halt the cell cycle.
  • Specific proteins and genes orchestrate the repair of various types of DNA lesions.
  • This response is essential for preventing mutations and cell death.

Outlook:

  • Further research into the DDR could lead to novel cancer therapies.
  • Targeting DDR pathways offers potential for personalized medicine approaches.
  • Understanding DDR mechanisms is fundamental for aging research and regenerative medicine.