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Adenovirus type 2 mRNA in transformed cells: map positions and difference in transport time
Abstract:
Adenovirus type 2 rat transformed cells produced two polyadenylic acid-terminated mRNA's with approximate coordinates 1.5-4.4 and 4.4-11.0 on the physical map of the adenovirus type 2 genome. These mRNA's were also formed early during lytic infection in addition to one or more smaller mRNA's from the 4.4-11.0 region. In transformed cells, the 1.5-4.4 mRNA appeared in the cell cytoplasm without detectable lag, whereas the 4.4-11.0 mRNA required at least 20 to 30 min for the maximal rate of accumulation.
Insights
Adenovirus type 2 transformed cells generate two polyadenylic acid-terminated mRNAs. These mRNAs show distinct accumulation rates in the cytoplasm during early lytic infection and transformation.
Area of Science:
- Molecular Biology
- Virology
- Cell Biology
Background:
- Adenovirus type 2 is a significant human pathogen.
- Understanding viral gene expression is crucial for developing antiviral strategies.
- Cellular transformation by viruses can alter host gene regulation.
Purpose of the Study:
- To identify and characterize polyadenylic acid-terminated mRNAs in adenovirus type 2 transformed rat cells.
- To compare the expression kinetics of these mRNAs during lytic infection and in transformed cells.
Main Methods:
- Analysis of mRNA populations using techniques like Northern blotting or S1 mapping.
- Physical mapping of viral genome regions corresponding to detected mRNAs.
- Time-course studies of mRNA accumulation in infected and transformed cells.
Main Results:
- Two major polyadenylic acid-terminated mRNAs were identified, mapping to genome coordinates 1.5-4.4 and 4.4-11.0.
- These mRNAs are also produced during early stages of adenovirus type 2 lytic infection.
- The 1.5-4.4 mRNA accumulates rapidly in the cytoplasm of transformed cells, while the 4.4-11.0 mRNA shows a delayed accumulation (20-30 minutes).
Conclusions:
- Adenovirus type 2 gene expression involves the production of distinct mRNA species.
- Differential accumulation kinetics of viral mRNAs in transformed cells suggest complex post-transcriptional regulation.
- These findings contribute to understanding adenovirus-induced cellular transformation and viral replication cycles.