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RNA Polymerase (RNAP) is conserved in all animals, with bacterial, archaeal, and eukaryotic RNAPs sharing significant sequence, structural, and functional similarities. Among the three eukaryotic RNAPs, RNA Polymerase II is most similar to bacterial RNAP in terms of both structural organization and folding topologies of the enzyme subunits. However, these similarities are not reflected in their mechanism of action.
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A reverse genetics system for enterovirus D68 using human RNA polymerase I.

Minglei Pan1, Shuai Gao1, Zhenwei Zhou1

  • 1School of Life Sciences, Tianjin University, 92 Weijin Road, Nankai District, Tianjin, 300072, China.

Virus Genes
|May 20, 2018
PubMed
Summary

Scientists developed a new reverse genetics system for Human enterovirus D68 (EV-D68) recovery. This system enables faster research into EV-D68, potentially accelerating vaccine and drug development for this contagious respiratory virus.

Keywords:
Human enterovirus D68Infectious cDNA cloneMinirepliconPol I promoterReverse genetic

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Area of Science:

  • Virology
  • Molecular Biology
  • Infectious Diseases

Background:

  • Human enterovirus D68 (EV-D68) is a highly contagious pathogen causing respiratory infections.
  • Currently, no effective vaccines exist to control EV-D68.
  • Understanding EV-D68 replication is crucial for developing countermeasures.

Purpose of the Study:

  • To establish a functional reverse genetics system for EV-D68.
  • To enable efficient recovery of infectious EV-D68 and minireplicons.
  • To facilitate research into EV-D68 biology and aid therapeutic development.

Main Methods:

  • Development of a reverse genetics system using RNA polymerase I (Pol I) promoter.
  • Construction of EV-D68 minireplicons with a luciferase reporter gene.
  • Transfection of plasmids encoding genomic RNA segments into 293T and RD cells to rescue infectious virus.

Main Results:

  • Successfully recovered infectious EV-D68 and minireplicons using the Pol I promoter system.
  • Pol I promoter-driven luciferase expression was significantly higher than T7 promoter.
  • Rescued viruses exhibited indistinguishable plaque morphology and growth kinetics compared to the parental strain.
  • Identified a G394C mutation that disrupts the viral 5'-UTR structure and suppresses cap-independent translation.

Conclusions:

  • The developed reverse genetics system provides a powerful tool for EV-D68 research.
  • This system significantly advances the study of EV-D68 replication and pathogenesis.
  • It holds promise for accelerating the development of novel EV-D68 vaccines and antiviral therapies.