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Related Concept Videos

DNA Damage can Stall the Cell Cycle02:36

DNA Damage can Stall the Cell Cycle

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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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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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Christian de Duve discovered “autophagy,” a process in which cellular components are engulfed by membrane-bound organelles called autophagosomes. The autophagosomes then fuse with lysosomes to digest the enclosed contents. Autophagy is generally activated in cells to prevent cell death. However, cell death is triggered when the damage is beyond repair.
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Internal cellular stress, such as cellular injury or hypoxia, triggers intrinsic apoptosis. The B-cell lymphoma 2 (Bcl-2) family of proteins are the primary regulators of the intrinsic apoptotic pathway. For example, during DNA damage, checkpoint proteins, such as Ataxia Telangiectasia Mutated (ATM protein) and Checkpoints Factor-2 (Chk2) proteins, are activated. These proteins phosphorylate p53 which further activates pro-apoptotic proteins, such as Bax, Bak, PUMA, and Noxa, and inhibits...
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Visualizing Mitophagy with Fluorescent Dyes for Mitochondria and Lysosome
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DNA damage invokes mitophagy through a pathway involving Spata18.

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DNA damage triggers mitophagy, a key mitochondrial quality control process, to maintain cellular energy and DNA repair. The protein Spata18 plays a crucial role in this response.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Mitochondria are essential for cellular energy production and signaling pathways, particularly under stress conditions.
  • Mitophagy, a selective form of autophagy, removes damaged mitochondria to maintain cellular health.
  • The response of mitochondria to acute DNA damage, specifically through mitophagy, requires further investigation.

Purpose of the Study:

  • To investigate the role of mitophagy in cellular response to acute DNA damage.
  • To identify key regulators involved in DNA damage-induced mitophagy.
  • To understand the functional consequences of altered mitophagy on cellular processes.

Main Methods:

  • Induction of DNA damage in primary fibroblasts, murine neurons, and Caenorhabditis elegans.
  • Assessment of mitophagy levels using specific markers and imaging techniques.
  • Genetic manipulation (knockdown) of the Spata18 protein and analysis of its effects.

Main Results:

  • DNA damage significantly increases mitophagy across different cell types and organisms.
  • The observed increase in mitophagy is independent of the specific DNA damaging agent used.
  • Knockdown of Spata18 impairs mitophagy, disrupts mitochondrial calcium (Ca2+) homeostasis, reduces ATP production, and hinders DNA repair efficacy.

Conclusions:

  • Mitophagy is a critical cellular response to acute DNA damage, essential for maintaining mitochondrial function.
  • The protein Spata18 is a key regulator of DNA damage-induced mitophagy and subsequent cellular processes.
  • Modulating mitophagy is vital for preserving mitochondrial health and ensuring efficient DNA repair.