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Updated: Nov 12, 2025

Spatial and Temporal Control of Murine Melanoma Initiation from Mutant Melanocyte Stem Cells
06:09

Spatial and Temporal Control of Murine Melanoma Initiation from Mutant Melanocyte Stem Cells

Published on: June 7, 2019

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Melanoma subpopulations that rapidly escape MAPK pathway inhibition incur DNA damage and rely on stress signalling

Chen Yang1,2,3, Chengzhe Tian1,2, Timothy E Hoffman1,2

  • 1Department of Biochemistry, University of Colorado Boulder, Boulder, CO, USA.

Nature Communications
|March 20, 2021
PubMed

Insights

Melanoma cells rapidly develop drug resistance through non-genetic means, utilizing ATF4 stress signaling to survive BRAF inhibitor treatment. This adaptation leads to DNA damage and a growing subpopulation prone to mutations.

Area of Science:

  • Cancer Biology
  • Drug Resistance Mechanisms
  • Melanoma Research

Background:

  • Effective anti-cancer therapies are often limited by the development of drug resistance.
  • The non-genetic mechanisms by which drug-sensitive cells initially evade treatment remain poorly understood.

Purpose of the Study:

  • To investigate the rapid, non-genetic mechanisms of BRAF inhibitor resistance in melanoma cells.
  • To identify the cellular pathways and consequences of early drug escape.

Main Methods:

  • Tracking the response of thousands of single melanoma cells to BRAF inhibitors.
  • Analysis of cellular signaling pathways, cell cycle dynamics, and DNA replication fidelity.

Main Results:

  • A subset of melanoma cells escapes BRAF inhibitors via non-genetic mechanisms within three days.
  • Escaping cells utilize ATF4 stress signaling for periodic cycling in the presence of drugs.
  • These cells exhibit DNA replication defects, leading to DNA damage, yet out-proliferate sensitive cells.

Conclusions:

  • Melanoma cells can adapt extremely rapidly to drug treatment through non-genetic adaptations.
  • This rapid adaptation generates a mutagenesis-prone subpopulation that expands during prolonged treatment.
  • Understanding these early non-genetic escape mechanisms is crucial for overcoming drug resistance.

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