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Yeast As a Chassis for Developing Functional Assays to Study Human P53
14:57

Yeast As a Chassis for Developing Functional Assays to Study Human P53

Published on: August 4, 2019

Ing1 mediates p53 accumulation and chromatin modification in response to oncogenic stress

María Abad1, Camino Menéndez, Annette Füchtbauer

  • 1Instituto de Investigaciones Biomédicas, Consejo Superior de Investigaciones Científicas-Universidad Autónoma de Madrid, E-28029 Madrid, Spain.

The Journal of Biological Chemistry
|August 19, 2007
PubMed

Insights

The Ing1 gene is crucial for cellular tumor protection. Its deficiency impairs the anti-proliferative response to oncogenic Ras, affecting p53 stability and chromatin remodeling, highlighting Ing1

Area of Science:

  • Oncology
  • Molecular Biology
  • Epigenetics

Background:

  • ING proteins are implicated as tumor suppressors, interacting with the p53 pathway and chromatin modification complexes.
  • The precise in vivo function of ING proteins in cellular responses to oncogenic stress remains incompletely understood.

Purpose of the Study:

  • To investigate the role of the murine Ing1 locus products in cellular tumor-protective mechanisms.
  • To elucidate the impact of Ing1 deficiency on oncogene-induced senescence and associated molecular pathways.

Main Methods:

  • Utilized Ing1-deficient mouse embryonic fibroblasts (MEFs) generated via betageo cassette insertion.
  • Assessed cellular proliferation, senescence markers, p53 accumulation and stability, and heterochromatin formation in response to oncogenic Ras expression.

Main Results:

  • Ing1-deficient MEFs exhibited a defective senescence-like antiproliferative response to oncogenic Ras, with impaired senescence markers.
  • Reduced p53 accumulation was observed in Ing1-deficient cells, attributed to decreased basal p53 protein stability.
  • Defects in heterochromatic mark appearance and impaired heterochromatin formation were noted during oncogene-induced senescence in Ing1-deficient cells.

Conclusions:

  • The Ing1 locus plays a significant role in cellular protection against oncogenic stress in vivo.
  • Ing1 acts as a mediator of p53 activation and a regulator of chromatin remodeling processes during tumor suppression.

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