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Structure, function, and evolution of adenovirus-associated RNA: a phylogenetic approach
1Cold Spring Harbor Laboratory, Cold Spring Harbor, New York 11724, USA.
Journal of Virology
|August 1, 1996
Summary
This study analyzes virus-associated (VA) RNA from human adenoviruses, revealing conserved structures critical for function. Findings suggest gene duplication and potential undiscovered roles for VA RNAII in virus survival.
Area of Science:
- Virology
- Molecular Biology
- RNA Biology
Background:
- Virus-associated (VA) RNA are small regulatory RNAs found in adenoviruses.
- Understanding VA RNA structure and function is crucial for comprehending adenovirus biology.
Purpose of the Study:
- To explore the structure and function of VA RNA species across 47 human adenovirus serotypes and one simian adenovirus.
- To classify VA RNAs based on sequence homology and structural conservation.
Main Methods:
- Amplification and sequencing of VA RNA gene regions from 43 human adenoviruses.
- Nuclease sensitivity analysis to probe the secondary structure of 10 representative VA RNAs.
- Sequence alignment and phylogenetic analysis to classify VA RNAs into families and superfamilies.
Main Results:
- Identified conserved structural features, including a critical tetranucleotide pair (GGGU:ACCC) in the central domain.
- Classified VA RNAs into eight families and three superfamilies based on sequence homology.
- Observed variations in apical stem and central domains, particularly in VA RNAII species.
- Proposed gene duplication as the evolutionary origin for viruses with two VA RNA genes.
Conclusions:
- VA RNA structure is highly conserved, with key domains essential for function.
- VA RNAII may have an undiscovered role in virus survival, despite evidence of gene loss in some serotypes.
- VA RNA genes may have originated from cellular sequences containing tRNA genes.