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Translational efficiencies of polyomavirus late mRNA molecules that differ in the sequences of their 5' noncoding
1Department of Microbiology, University of Connecticut Health Center, Farmington 06032.
Abstract:
Mouse NIH 3T6 cells were coinfected with two strains of polyomavirus that differ only in the sequences of their 5' noncoding late leader exons. Polysomes were isolated at late times after infection and probed with oligonucleotides specific for each strain. Results indicate that the sequence of the late leader does not play a role in the translational efficiency of late polyomavirus messages.
Insights
The sequence of the 5' noncoding late leader exon in polyomavirus does not affect how efficiently late viral messages are translated. This finding is crucial for understanding polyomavirus gene expression regulation.
Area of Science:
- Virology
- Molecular Biology
- Genetics
Background:
- Polyomaviruses are small DNA viruses that utilize host cell machinery for replication and gene expression.
- The 5' noncoding region of viral messenger RNAs (mRNAs) often contains regulatory elements influencing translation.
- Specific exon sequences within the 5' noncoding region of polyomavirus late mRNAs have been identified.
Purpose of the Study:
- To investigate the role of the 5' noncoding late leader exon sequence in the translational efficiency of late polyomavirus messages.
- To determine if sequence variations in this specific exon impact viral gene expression.
Main Methods:
- Coinfection of mouse NIH 3T6 cells with two distinct polyomavirus strains differing only in their 5' noncoding late leader exon sequences.
- Isolation of polysomes at late stages of viral infection.
- Probing of polysomal RNA with sequence-specific oligonucleotides to quantify the translation of each viral strain.
Main Results:
- Analysis of polysomes revealed no significant difference in the translational efficiency between the two polyomavirus strains.
- The sequence variation in the 5' noncoding late leader exon did not confer a selective advantage or disadvantage for translation.
Conclusions:
- The sequence of the 5' noncoding late leader exon is not a determining factor for the translational efficiency of late polyomavirus messages.
- Other regulatory mechanisms likely govern the translation of late viral transcripts.