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Ribonuclease P-mediated inhibition of human cytomegalovirus gene expression and replication induced by engineered

Xiaohong Jiang1, Yuan-Chuan Chen, Hao Gong

  • 1School of Public Health, University of California, Berkeley, CA USA.

RNA Biology
|September 29, 2012
PubMed

Insights

Engineered external guide sequences (EGSs) effectively target human cytomegalovirus (HCMV) mRNA, significantly reducing viral gene expression and growth. This demonstrates EGS RNA variants

Area of Science:

  • Molecular Biology
  • RNA Therapeutics
  • Virology

Background:

  • External guide sequences (EGSs) are RNA molecules that guide ribonuclease P (RNase P) to cleave specific mRNA targets.
  • Previous work generated EGS variants with high in vitro activity for mRNA cleavage.

Purpose of the Study:

  • To construct EGSs targeting the overlapping mRNA of human cytomegalovirus (HCMV) capsid scaffolding protein (CSP) and assemblin.
  • To evaluate the efficacy of a novel EGS variant in inhibiting HCMV gene expression and viral replication.

Main Methods:

  • In vitro selection to generate EGS variants.
  • Construction of EGSs targeting HCMV CSP/assemblin mRNA.
  • Assessing EGS activity in HCMV-infected cells for gene expression and viral growth reduction.

Main Results:

  • The engineered EGS variant showed 40-fold higher activity than a tRNA-derived EGS in directing RNase P cleavage.
  • HCMV-infected cells expressing the variant EGS exhibited 98% reduction in CSP/assemblin gene expression.
  • Significant reductions in viral growth (7000-fold) were observed with the variant EGS compared to the tRNA-derived EGS (250-fold).

Conclusions:

  • The engineered EGS variant is highly effective in blocking HCMV gene expression and viral propagation.
  • These findings highlight the potential of active EGS RNA variants for anti-HCMV gene targeting therapies.

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