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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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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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Translesion DNA Polymerases02:10

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Translesion (TLS) polymerases rescue stalled DNA polymerases at sites of damaged bases by replacing the replicative polymerase and installing a nucleotide across the damaged site. Doing so, TLS allows additional time for the cell to repair the damage before resuming regular DNA replication.
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DNA Topoisomerases02:02

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Topoisomerases are enzymes that relax overwound DNA molecules during various cell processes, including DNA replication and transcription. These enzymes regulate positive and negative DNA supercoiling without changing the nucleotide sequence. DNA overwinding in a clockwise direction results in positively supercoiled DNA, whereas underwinding in a counterclockwise direction produces negatively supercoiled DNA.
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DNA Helicases00:55

DNA Helicases

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DNA unwinding helicase enzymes are a type of motor protein. Motor proteins can translocate along filaments or polymers using energy generated from ATP hydrolysis. Helicases are involved in all the important cellular processes where DNA unwinding is required, such as DNA replication, repair, recombination, and transcription. They are present in all living organisms, but vary in their structure, function, and mechanism of action. For example, in prokaryotes, DnaB helicase binds and translocates...
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Two- and Three-Dimensional Live Cell Imaging of DNA Damage Response Proteins
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DNA Damage Response in Prostate Cancer.

Matthew J Schiewer1,2, Karen E Knudsen1,3,4,5,2

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Prostate cancer (PCa) progression is linked to DNA repair pathway alterations. Targeting these DNA repair defects offers a promising strategy for treating advanced castration-resistant PCa (CRPC).

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Area of Science:

  • Oncology
  • Genetics
  • Urology

Background:

  • Prostate adenocarcinoma (PCa) is a major health concern, with disseminated disease being uniformly fatal.
  • Current treatments for metastatic PCa focus on androgen receptor (AR) signaling suppression, but tumors often develop resistance, leading to castration-resistant PCa (CRPC).
  • AR signaling plays a role in DNA repair, and defects in these pathways are associated with PCa progression and poor outcomes.

Purpose of the Study:

  • To review DNA repair alterations in clinical PCa settings.
  • To explore the molecular and cellular consequences of DNA repair dysfunction in PCa.
  • To consider clinical strategies for targeting PCa with altered DNA repair.

Main Methods:

  • Literature review of clinical studies and molecular research.
  • Analysis of the role of AR signaling in DNA repair pathways.
  • Exploration of the link between DNA repair defects and PCa progression.

Main Results:

  • Alterations in DNA damage repair pathways are frequently observed in clinical PCa.
  • Dysfunctional DNA repair contributes to PCa progression and resistance to therapy.
  • AR signaling is implicated in the regulation of DNA repair mechanisms.

Conclusions:

  • Targeting DNA repair pathways represents a potential therapeutic strategy for CRPC.
  • Understanding DNA repair alterations is crucial for developing effective treatments for advanced PCa.
  • Further research is needed to fully elucidate the role of DNA repair in PCa and to develop targeted therapies.