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Sequence analysis of Raji Epstein-Barr virus DNA
G Hatfull1, A T Bankier, B G Barrell
1MRC Laboratory of Molecular Biology, MRC Centre, Cambridge, United Kingdom.
Virology
|June 1, 1988
Summary
This study details DNA deletions in Raji Epstein-Barr virus (EBV), identifying genetic variations that likely cause replication defects and alter key viral protein structures.
Area of Science:
- Molecular Biology
- Virology
- Genetics
Background:
- Epstein-Barr virus (EBV) is a human herpesvirus associated with various cancers.
- The Raji strain of EBV has a known replication defect.
- Understanding EBV genetic variations is crucial for comprehending viral pathogenesis.
Purpose of the Study:
- To determine the DNA sequence of specific EBV fragments in the Raji strain.
- To identify and characterize deletions within the Raji EBV genome.
- To correlate genetic alterations with the observed replication defect and gene structure.
Main Methods:
- DNA sequencing of EcoRI Dhet and BamHI E fragments of Raji EBV.
- Identification and precise localization of deletions in the Raji DNA.
- Comparative sequence analysis between Raji and B95-8 EBV strains.
Main Results:
- Two deletions in the Raji EBV DNA were precisely located.
- Deletions affect reading frames BALF1, BARF1, BZLF2, and truncate BALF2 and BERF5, likely causing the replication defect.
- Significant sequence variation exists between B95-8 and Raji EBV strains.
- The latent membrane protein gene shows high polymorphism, and a key initiator methionine is absent in Raji.
Conclusions:
- The identified deletions provide a molecular explanation for the replication defect in the Raji EBV strain.
- Sequence variations highlight genetic diversity within EBV strains, particularly in important functional genes.
- Further research into these genetic differences may reveal novel therapeutic targets.