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In Vitro Selection of Engineered Transcriptional Repressors for Targeted Epigenetic Silencing
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Published on: May 5, 2023

Engineered external guide sequences effectively block viral gene expression and replication in cultured cells.

Xiaohong Jiang1, Yong Bai, Paul Rider

  • 1School of Life Sciences, Nanjing University, Nanjing, Jiangsu 210093, China.

The Journal of Biological Chemistry
|October 29, 2010
PubMed
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Engineered external guide sequences (EGS) effectively target human Ribonuclease P (RNase P) to degrade human cytomegalovirus (HCMV) protease mRNA. This novel nucleic acid approach significantly inhibits viral replication and gene expression.

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Area of Science:

  • Molecular Biology
  • Gene Therapy
  • Virology

Background:

  • Ribonuclease P (RNase P) complexed with external guide sequences (EGS) offers a novel nucleic acid-based gene interference strategy.
  • Previous work established EGS variants capable of directing human RNase P to cleave target mRNA in vitro.
  • Human cytomegalovirus (HCMV) protease is essential for viral capsid formation and replication.

Purpose of the Study:

  • To evaluate an engineered EGS variant for its efficacy in targeting the mRNA of the human cytomegalovirus (HCMV) protease.
  • To assess the potential of this nucleic acid-based approach for inhibiting HCMV gene expression and viral growth.

Main Methods:

  • An in vitro selection procedure was used to generate EGS variants.
  • A specific EGS variant was designed to target the mRNA encoding the HCMV protease.
  • The activity of the EGS variant was compared to a natural tRNA-derived EGS in HCMV-infected cells.

Main Results:

  • The engineered EGS variant demonstrated approximately 35-fold higher activity in directing RNase P cleavage of the target mRNA in vitro compared to the natural tRNA-derived EGS.
  • In HCMV-infected cells, the EGS variant achieved a 95% reduction in protease expression and a 4,000-fold reduction in viral growth.
  • Control experiments with disabled EGS or no EGS showed no significant inhibition, confirming the specificity and efficacy of the engineered EGS.

Conclusions:

  • Engineered EGS variants are highly effective in blocking HCMV expression and replication by specifically targeting the viral protease mRNA.
  • This study validates the utility of engineered EGS RNAs as a powerful tool for gene targeting applications.
  • The findings demonstrate a promising strategy for inhibiting HCMV infection by blocking the expression of essential viral proteins.