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Putative RNA-directed adaptive mutations in cancer evolution.

Didier Auboeuf1

  • 1Univ Lyon, ENS de Lyon, Univ Claude Bernard, CNRS UMR 5239, INSERM U1210, Laboratory of Biology and Modelling of the Cell, Lyon, France.

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|October 8, 2016
PubMed
Summary
This summary is machine-generated.

Cancer cells adapt to stress by using RNA molecules to intentionally mutate their own genome, a non-random process that aids survival during therapy.

Keywords:
adaptive mutationscancerevolutionmutationssmall RNAs

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Area of Science:

  • Molecular Biology
  • Cancer Research
  • Genetics

Background:

  • Cancer cell adaptation to the tumor microenvironment and therapies is poorly understood.
  • Cancer evolution is often viewed as driven by random mutations and natural selection.
  • The precise mechanisms enabling cancer cells to survive and adapt remain a significant challenge.

Purpose of the Study:

  • To challenge the notion of randomness in cancer-associated mutations.
  • To describe molecular mechanisms of stress-mediated, RNA-directed genome mutation in cancer cells.
  • To propose how cancer cells may intentionally increase their mutation rate under stress.

Main Methods:

  • Investigated stress-mediated biogenesis of messenger RNA (mRNA)-derived small RNAs.
  • Analyzed the targeting of small RNAs to their genomic loci of origin.
  • Examined the role of cellular reprogramming and inflammation in triggering these mechanisms.

Main Results:

  • Identified stress-induced small RNAs capable of targeting and increasing mutation rates at specific genomic loci.
  • Demonstrated that stress, including anticancer drugs, can trigger RNA-directed mutagenesis.
  • Showed that inflammation and cellular reprogramming facilitate the expression of these mutagenic tools.

Conclusions:

  • Some cancer mutations may not be random but are actively generated through RNA-directed mechanisms.
  • This RNA-directed mutagenesis provides a survival advantage by alleviating stress, such as from therapies.
  • Cancer cells possess sophisticated molecular tools to modify their own genome in response to adverse conditions.