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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

Differentially regulated micro-RNAs and actively translated messenger RNA transcripts by tumor suppressor p53 in

Yaguang Xi1, Reut Shalgi, Oystein Fodstad

  • 1University of South Alabama-Cancer Research Institute, Mobile, Alabama and Weizmann Institute of Science, Rehovot, Israel.

Clinical Cancer Research : an Official Journal of the American Association for Cancer Research
|April 13, 2006
PubMed
Abstract

Insights

The tumor suppressor p53 influences micro-RNA (miRNA) expression and impacts gene regulation at multiple levels. This study reveals novel interactions between p53 and miRNAs in controlling cellular gene expression.

Area of Science:

  • Molecular Biology
  • Gene Regulation
  • Cancer Biology

Background:

  • The p53 protein is a critical tumor suppressor involved in various cellular processes.
  • MicroRNAs (miRNAs) are small non-coding RNAs that regulate gene expression post-transcriptionally.
  • Understanding the interplay between p53 and miRNAs is crucial for deciphering complex gene regulatory networks in cancer.

Purpose of the Study:

  • To investigate the role of p53 as a transcription factor in regulating miRNA expression.
  • To explore p53's potential effects on cellular mRNA gene expression at the translational level, mediated by miRNAs or its RNA-binding function.

Main Methods:

  • Utilized human colon cancer cell lines HCT-116 (wild-type p53) and HCT-116 (null-p53).
  • Employed miRNA expression arrays and real-time quantitative reverse transcription-PCR to assess miRNA expression.
  • Conducted high-density microarray gene expression analysis to quantify mRNA transcripts.

Main Results:

  • Wild-type p53 significantly affected the expression levels of numerous miRNAs.
  • Over 46% of miRNA promoters contained potential p53-binding sites, indicating direct regulation.
  • Nearly 200 cellular mRNA transcripts were regulated post-transcriptionally, with some identified as potential miRNA targets.

Conclusions:

  • This study provides the first evidence of an interaction between wild-type p53 and miRNAs in gene expression regulation.
  • Demonstrates that p53 regulates genes through unique mechanisms at multiple levels.
  • Highlights the intricate relationship between p53, miRNAs, and mRNA expression in cellular processes.

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