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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

Transcriptional specificity in various p53-mutant cells

Kumio Okaichi1, Nanaka Izumi, Yuma Takamura

  • 1Department of Radioisotope Medicine, Atomic Bomb Disease and Hibakusha Medicine Unit, Atomic Bomb Disease Institute, Nagasaki University, 12-4 Sakamoto 1-chome, Nagasaki 852, Japan. okaichi@nagasaki-u.ac.jp

Anticancer Research
|March 14, 2013
PubMed

Insights

Tumor suppressor gene p53 mutations are common. Hot-spot p53 mutations uniquely increase CADPS2, PIWIL4, and TRIM9 transcription, potentially promoting tumor growth by affecting cell cycle pathways.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Mutation of the tumor suppressor gene p53 is the most frequent genetic alteration in human cancers.
  • The link between specific p53 mutation sites and altered gene transcription remains unclear.

Purpose of the Study:

  • To investigate the transcriptional consequences of various p53 mutations found in human tumors.
  • To compare the effects of hot-spot p53 mutations versus other mutations on gene expression.

Main Methods:

  • Saos-2 cells were engineered with diverse p53 mutations characteristic of human tumors.
  • Transcriptional changes resulting from these p53 mutations were analyzed.

Main Results:

  • All p53 mutants exhibited both loss and gain of function.
  • Hot-spot p53 mutations significantly upregulated transcription (over 2-fold) of CADPS2, PIWIL4, and TRIM9.
  • Other p53 mutations did not induce similar transcriptional changes.

Conclusions:

  • Hot-spot p53 mutations have distinct transcriptional effects compared to other mutations.
  • The induced expression of PIWIL4, which inhibits cell growth and genomic instability pathways, may contribute to the prevalence of hot-spot p53 mutations in tumors.

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