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Structural analyses of the Epstein-Barr virus BamHI A transcripts
1Department of Microbiology and Immunology, University of North Carolina at Chapel Hill 27599-7295.
Journal of Virology
|February 1, 1995
Summary
Epstein-Barr virus (EBV) gene expression in nasopharyngeal carcinoma (NPC) involves complex BamHI A transcripts. These alternatively spliced mRNAs, with varied start and end sites, regulate EBV protein expression in infected cells.
Area of Science:
- Virology
- Molecular Biology
- Cancer Research
Background:
- Epstein-Barr virus (EBV) gene expression is crucial in nasopharyngeal carcinoma (NPC).
- BamHI A fragment rightward transcription yields mRNAs of 4.0–8.0 kb, including BARF0 ORF.
Purpose of the Study:
- To define the structures of EBV BamHI A transcripts.
- To characterize their expression in EBV-infected tissues.
- To investigate alternative splicing and 3'-end processing.
Main Methods:
- cDNA cloning
- Reverse transcription-based PCR (RT-PCR)
- Northern (RNA) blotting
- 5'-end and 3'-end analysis
Main Results:
- Identified novel mRNAs containing BARF0 and additional ORFs with extended BARF0 length (174 to 279 codons).
- Observed complex alternative splicing patterns and heterogeneous 3'-end processing.
- Detected diverse BamHI A transcripts in NPC, Burkitt's lymphoma, and parotid carcinoma.
Conclusions:
- EBV BamHI A transcripts exhibit intricate structures due to alternative splicing and varied processing.
- These regulatory mechanisms likely control the in vivo expression of EBV ORFs.