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Function of the ING family of PHD proteins in cancer

Wei Gong1, Keiko Suzuki, Michael Russell

  • 1Department of Biochemistry, Faculty of Medicine, University of Calgary HSC, 370 Heritage Medical Research Building, 3330 Hospital Drive, NW, Calgary, Alta., Canada T2N 4N1.

The International Journal of Biochemistry & Cell Biology
|March 4, 2005
PubMed

Insights

ING proteins, involved in DNA repair and cell cycle regulation, act as tumor suppressors. They maintain genomic stability by influencing gene transcription and apoptosis, restricting cancer cell growth.

Area of Science:

  • Molecular Biology
  • Genetics
  • Cancer Research

Background:

  • ING genes encode proteins with plant homeodomain (PHD)-type zinc fingers.
  • ING1 interacts with histone modifying complexes (HAT, HDAC, FAT).
  • ING proteins regulate p53-inducible genes and affect p53 post-translational modifications.

Purpose of the Study:

  • To elucidate the role of ING proteins in cellular processes.
  • To understand the tumor suppressor functions of ING family proteins.

Main Methods:

  • Investigated ING1's interaction with chromatin remodeling complexes.
  • Analyzed ING1's role in DNA damage response (UV irradiation).
  • Examined ING protein expression in various cancer types.

Main Results:

  • ING1 mediates cell cycle arrest and DNA repair or apoptosis post-UV irradiation.
  • ING proteins link DNA repair, apoptosis, and chromatin remodeling to gene regulation.
  • ING proteins are downregulated in diverse cancers.

Conclusions:

  • ING1 functions as a tumor suppressor by maintaining genomic stability.
  • ING proteins restrict cell growth, induce apoptosis, and modulate cell cycle progression.
  • ING family proteins are classified as class II tumor suppressors.

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