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Related Concept Videos

Genetic Screens02:46

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Related Experiment Video

Updated: Nov 23, 2025

Implementation of In Vitro Drug Resistance Assays: Maximizing the Potential for Uncovering Clinically Relevant Resistance Mechanisms
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Genetic screening for single-cell variability modulators driving therapy resistance.

Eduardo A Torre1, Eri Arai2, Sareh Bayatpour3

  • 1Biochemistry and Molecular Biophysics Graduate Group, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.

Nature Genetics
|January 5, 2021
PubMed
Summary

Cellular plasticity, the ability of cells to change phenotypes, is key to melanoma drug resistance. Manipulating this plasticity before BRAF inhibition enhances therapy resistance, offering new cancer treatment strategies.

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Area of Science:

  • Oncology
  • Cell Biology
  • Genetics

Background:

  • Cellular plasticity enables cells to alter phenotypes, crucial for cancer adaptation.
  • In melanoma, cellular plasticity underlies the development of resistance to BRAF inhibitors.
  • The mechanisms governing this cellular priming remain largely unexplored.

Purpose of the Study:

  • To identify genes influencing cell fate decisions and cellular plasticity in melanoma.
  • To elucidate the role of cellular plasticity in acquired resistance to BRAF inhibition.
  • To explore therapeutic strategies targeting cellular plasticity for overcoming drug resistance.

Main Methods:

  • Utilized CRISPR-Cas9 genetic screens to identify key genes affecting cellular plasticity and fate decisions.
  • Investigated the impact of manipulating cellular plasticity on melanoma cell response to BRAF inhibition.
  • Compared the efficacy of pre-treatment inhibition of DOT1L versus concurrent administration with BRAF inhibitors.

Main Results:

  • Identified multiple factors independently influencing cellular priming and cell fate decisions.
  • Discovered a novel plasticity-driven mechanism of BRAF inhibitor resistance involving a shift towards a differentiated state.
  • Demonstrated that inhibiting DOT1L prior to BRAF inhibitor treatment significantly increased therapy resistance.

Conclusions:

  • Modulating cellular plasticity can effectively alter cell fate decisions in melanoma.
  • Targeting cellular plasticity presents a promising strategy for overcoming BRAF inhibitor resistance.
  • This approach may hold potential for treating drug resistance across various cancer types.