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In Vivo Inhibition of MicroRNA to Decrease Tumor Growth in Mice
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In Vivo Inhibition of MicroRNA to Decrease Tumor Growth in Mice

Published on: August 23, 2019

Regulation of the microRNA processor DGCR8 by the tumor suppressor ING1

Daniel Gómez-Cabello1, Sergio Callejas, Alberto Benguría

  • 1Instituto de Investigaciones Biomédicas CSIC-UAM, Madrid, Spain.

Cancer Research
|February 25, 2010
PubMed

Insights

The ING1 tumor suppressor regulates gene expression, impacting microRNA biogenesis by controlling DGCR8 transcription. ING1 and DGCR8 cooperate to inhibit cell proliferation, linking tumor suppressors to microRNA machinery.

Area of Science:

  • Molecular Biology
  • Cancer Biology
  • Epigenetics

Background:

  • ING proteins are tumor suppressors involved in cell cycle control, apoptosis, and migration.
  • They function in transcriptional control by recognizing histone marks and recruiting chromatin-modifying complexes.
  • ING proteins are functionally linked to the p53 pathway.

Purpose of the Study:

  • To investigate the global effect of ING1 on gene regulation using genome-wide expression analysis.
  • To identify specific genes regulated by ING1.
  • To explore the functional relationship between ING1 and microRNA biogenesis.

Main Methods:

  • Genome-wide expression profiling of primary embryonic fibroblasts lacking the Ing1 locus.
  • Analysis of gene expression changes.
  • Chromatin immunoprecipitation (ChIP) to assess ING1 binding to the DGCR8 promoter.
  • Assessment of ING1 and DGCR8 cooperation in cell proliferation assays.

Main Results:

  • ING1 predominantly acts as a transcriptional repressor, affecting diverse cellular functions.
  • DGCR8, a key regulator in microRNA biogenesis, was identified among ING1-regulated genes.
  • ING1 binds to the DGCR8 promoter, controlling its transcription via chromatin regulation.
  • ING1 and DGCR8 were found to cooperate in restraining cell proliferation.

Conclusions:

  • This study reveals a novel link between ING1 and DGCR8, a microRNA biogenesis regulator.
  • It establishes a new connection between tumor suppressor proteins and the microRNA machinery.
  • ING1's role in regulating microRNA biogenesis contributes to its tumor-suppressive functions.

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