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Coronavirus transcription: subgenomic mouse hepatitis virus replicative intermediates function in RNA synthesis
1Department of Microbiology, Medical College of Ohio, Toledo 43699.
Journal of Virology
|March 1, 1990
Summary
Mouse hepatitis virus (MHV) replication involves both genomic and subgenomic intermediates. Findings suggest coronaviruses use a novel strategy with subgenomic negative strands to produce mRNAs.
Area of Science:
- Virology
- Molecular Biology
- Genetics
Background:
- Coronaviruses, like mouse hepatitis virus (MHV), possess complex RNA genomes.
- Understanding viral replication strategies is crucial for developing antiviral therapies.
Purpose of the Study:
- To investigate the replicative intermediates (RIs) and replicative-form (RF) RNAs in MHV-infected cells.
- To elucidate the replication strategy of coronaviruses, specifically MHV.
Main Methods:
- Infection of 17CL1 mouse cells with the A59 strain of MHV.
- Analysis of RNase-resistant RF RNAs after RNase A treatment.
- Radiolabeling of RIs using [3H]uridine and gel electrophoresis.
Main Results:
- Seven species of RNase-resistant RF RNAs were identified, corresponding to MHV positive-strand RNAs.
- MHV RF RNAs were derived from both genome- and subgenome-length RIs, unlike alphaviruses.
- Subgenomic RIs were found to be transcriptionally active, indicating their role in RNA synthesis.
Conclusions:
- Coronaviruses, including MHV, employ a novel replication strategy involving subgenomic negative strands.
- This strategy facilitates the production of subgenomic messenger RNAs (mRNAs).
- The findings contribute to understanding coronavirus RNA synthesis and potential therapeutic targets.