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A subgenomic RNA associated with cherry leafroll virus infections
1Department of Plant Pathology, College of Agricultural and Environmental Sciences, University of California, Davis 95616, USA.
Virology
|August 1, 1995
Summary
Cherry leafroll nepovirus (CLRV) produces genomic RNAs 1 and 2. A novel RNA 1A, derived from RNA 1, was identified in infected plants and protoplasts, functioning as a subgenomic RNA.
Area of Science:
- Plant virology
- Molecular biology
- RNA biology
Background:
- Cherry leafroll nepovirus (CLRV) possesses two genomic RNAs (RNA 1 and RNA 2) with 3' polyadenylate tracts and a 3' common region.
- Previous studies have characterized the genomic structure of CLRV, but smaller RNA species have not been fully elucidated.
Purpose of the Study:
- To identify and characterize novel RNA species associated with CLRV infection.
- To determine the origin and nature of a newly observed 1.5 kb RNA in CLRV-infected cells.
Main Methods:
- Hybridization probing using a complementary sequence to the CLRV 3' common region.
- Partial purification of the novel RNA via preparative gel electrophoresis and affinity chromatography.
- Analysis of RNA transcripts and cDNA clones to determine RNA sequence and origin.
Main Results:
- A 1.5 kb RNA, designated RNA 1A, was detected in CLRV-infected Nicotiana tabacum protoplasts and Chenopodium quinoa.
- RNA 1A was identified as corresponding to the 3' 1500 nucleotides of CLRV genomic RNA 1.
- RNA 1A was not found as encapsidated RNA and its accumulation decreased post-inoculation, suggesting a subgenomic origin.
Conclusions:
- RNA 1A represents a novel subgenomic RNA of CLRV, likely synthesized from a negative-sense RNA 1 template.
- The characterization of RNA 1A provides new insights into the complex RNA metabolism and replication strategies of nepoviruses.
- This finding contributes to a deeper understanding of CLRV pathogenesis and viral gene expression.