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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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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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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns (non-coding regions of a gene) or intergenic regions (stretches of DNA present between genes). Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself, forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA...
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Nucleosomes are the basic units of chromatin compaction. Each nucleosome consists of the DNA bound tightly around a histone core, which makes the DNA inaccessible to DNA binding proteins such as DNA polymerase and RNA polymerase. Hence, the fundamental problem is to ensure access to DNA when appropriate, despite the compact and protective chromatin structure.
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MicroRNAs and the DNA damage response: How is cell fate determined?

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MicroRNAs (miRNAs) fine-tune the DNA damage response (DDR) to influence cell fate. Understanding miRNA roles in DDR is key to overcoming cancer chemoresistance and improving treatment efficacy.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • The DNA damage response (DDR) determines cell fate (arrest, senescence, apoptosis) after DNA damage.
  • MicroRNAs (miRNAs) are small non-coding RNAs involved in transcriptional regulation.
  • Many miRNAs are inducible by DNA damage, suggesting a role in DDR-mediated cell fate decisions.

Purpose of the Study:

  • To review the biological relevance and function of miRNAs in the DNA damage response.
  • To clarify the physiological significance of endogenous miRNAs in DDR.
  • To explore miRNAs as potential therapeutic targets for cancer treatment.

Main Methods:

  • Literature review of studies on miRNAs and DNA damage response.
  • Analysis of miRNA dysregulation in cancer tissues.
  • Discussion of miRNA roles in regulating key DDR proteins.

Main Results:

  • MiRNAs can 'fine-tune' the DDR, influencing cell fate decisions.
  • Dysregulated miRNAs are implicated in cancer chemoresistance through altered DDR.
  • A functional link between specific miRNAs and DDR pathways requires further elucidation.

Conclusions:

  • MiRNAs are critical regulators of the DNA damage response and cell fate.
  • Targeting miRNAs may offer strategies to overcome cancer chemoresistance.
  • Further research is needed to clarify the precise roles of endogenous miRNAs in DDR for therapeutic applications.