Related Experiment Video

Updated: Oct 29, 2025

Induction of Mesenchymal-Epithelial Transitions in Sarcoma Cells
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Induction of Mesenchymal-Epithelial Transitions in Sarcoma Cells

Published on: April 7, 2017

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Loss of MGA repression mediated by an atypical polycomb complex promotes tumor progression and invasiveness

Haritha Mathsyaraja1, Jonathen Catchpole1, Brian Freie1

  • 1Basic Sciences Division, Fred Hutchinson Cancer Research Center, Seattle, United States.

Elife
|July 8, 2021
PubMed

Insights

MGA acts as a tumor suppressor by regulating gene expression. Its loss accelerates cancer growth and increases invasiveness in lung and colon cancers.

Area of Science:

  • Molecular Biology
  • Oncology
  • Genetics

Background:

  • MGA is a transcription factor within the MYC network, frequently altered in various cancers.
  • Its precise role as a tumor suppressor in vivo remains to be fully elucidated.

Purpose of the Study:

  • To investigate the in vivo tumor suppressive function of MGA in non-small cell lung cancer.
  • To determine the molecular mechanisms underlying MGA's role in cancer progression.

Main Methods:

  • CRISPR-based inactivation of the Mga gene in mouse models of non-small cell lung cancer.
  • Analysis of gene expression changes, focusing on non-canonical Polycomb targets.
  • Assessment of invasive capabilities in human lung adenocarcinoma cell lines and human colon organoids.

Main Results:

  • MGA loss significantly accelerated tumor growth in mouse models.
  • MGA deficiency led to the de-repression of ncPRC1.6 targets involved in metastasis and meiosis.
  • MGA deletion enhanced invasive properties of human lung cancer cells and promoted growth in colon organoids.

Conclusions:

  • MGA functions as a bona fide tumor suppressor in vivo.
  • MGA's tumor suppressive mechanism involves transcriptional attenuation of MYC and E2F targets via the MGA-MAX/ncPRC1.6 complex.
Keywords:
MAXMGAcancer biologycolon organoidslung adenocarcinomamousenon-canonical polycombtumor suppressor

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