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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

Targeted disruption of transcriptional regulatory function of p53 by a novel efficient method for introducing a decoy

Masakiyo Sakaguchi1, Takamasa Nukui, Hiroyuki Sonegawa

  • 1Department of Cell Biology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences Shikatachou, Okayama 700-8558, Japan.

Nucleic Acids Research
|May 28, 2005
PubMed

Insights

Researchers developed a novel nuclear transport system for decoy oligonucleotides, enhancing their ability to block transcription factors. This method improves delivery efficiency and specificity for targeted gene regulation in various cell types.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biotechnology

Background:

  • Decoy oligonucleotides sequester transcription factors, but efficient nuclear delivery is challenging.
  • Lipofection is common but has variable efficiency and lacks nuclear specificity.
  • Targeting nuclear proteins requires effective oligonucleotide delivery systems.

Purpose of the Study:

  • To design and evaluate a novel vehicle for transporting decoy oligonucleotides into cell nuclei.
  • To assess the efficiency and specificity of this system in various cell types.
  • To demonstrate the functional disruption of DNA-binding proteins using this delivery system.

Main Methods:

  • A fusion protein vehicle was engineered, comprising glutathione-S-transferase, arginine residues, GAL4 DNA-binding domain, and a nuclear localization signal.
  • The vehicle facilitated the transfer of a p53-responsive element linked to GAL4 UAS into neuronal cells, embryonic stem cells, and human normal cells.
  • The efficacy of p53 decoy oligonucleotides in blocking cisplatin-induced transcription of p21(WAF1/CIP1) and Bax was assessed.

Main Results:

  • The designed vehicle efficiently delivered oligonucleotides into the nuclei of diverse cell types.
  • The p53 decoy oligonucleotide successfully blocked cisplatin-induced transcriptional activation mediated by p53.
  • The system demonstrated specific disruption of DNA-binding protein function in cultured cells.

Conclusions:

  • The developed nuclear transport system offers a convenient and powerful method for delivering oligonucleotides.
  • This system enables specific disruption of DNA-binding protein functions in cellular research.
  • It provides a valuable tool for targeted gene regulation and functional studies.

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