Epstein-Barr virus-associated nuclear antigen-1 carboxy-terminal gene sequences in Japanese and American patients with gastric carcinoma.

Abstract

We examined Epstein-Barr virus (EBV)-associated nuclear antigen-1 (EBNA-1) gene carboxy (C)-terminal deletions occurring in gastric carcinoma and noncarcinoma tissues from two different ethnic populations. Previously reported EBNA-1 C-terminal region amino acid sequence variations include five subtypes based on the amino acid at codon 487: Prototype (P)-ala, which is found in the B95.8-derived prototype virus; P-thr; Variant (V)-pro; V-leu; and V-val. Using polymerase chain reaction to amplify fragments of the EBNA-1 gene, followed by gene sequencing, we identified a single EBNA-1 gene sequence variant (V-val') in all 25 cases of known EBV-positive gastric carcinoma and all 8 cases of known EBV-positive reactive follicular hyperplasia from Japan. All 17 cases of known EBV-positive American gastric carcinomas had a single EBNA-1 gene sequence, including 3 P-ala or P-ala variants, 9 P-thr, 4 V-leu or V-leu variants, and 1 V-val'. All 11 cases of American reactive lymphoid tissue also had a single EBNA-1 gene sequence, including 2 P-ala variants, 5 P-thr or P-thr variants, and 4 V-leu. Variant EBNA-1 sequences were more common in both carcinoma and non-neoplastic tissues than the prototype sequence, whether from Japan or America. The EBNA-1 gene sequences found in the two ethnic populations differed, suggesting that variation in EBNA-1 gene sequence is due to polymorphisms present within pre-existing viral strains prevalent within various ethnic populations. The EBNA-1 gene sequences in reactive tissues were similar to those in malignant tissues from the same ethnic population, suggesting that the differences in EBNA-1 gene sequences do not result from mutation occurring during neoplastic transformation and that there may not be a selective cell tropism for different EBNA-1 proteins, as previously suggested.

• Authors: Y Y Chen, K L Chang, W G Chen, D Shibata, K Hayashi, L M Weiss
• Journal: Laboratory investigation; a journal of technical methods and pathology (Lab Invest) Vol. 78 Issue 7 Pg. 877-82 (Jul 1998) ISSN: 0023-6837 [Print] United States
• PMID: 9690565 (Publication Type: Journal Article)

Chemical References

• Antigens, Viral
• EBV-associated membrane antigen, Epstein-Barr virus
• Viral Matrix Proteins

Topics

• Amino Acid Substitution
• Antigens, Viral (genetics)
• Base Sequence
• Carcinoma (virology)
• Genetic Variation
• Herpesvirus 4, Human (classification, genetics, isolation & purification)
• Humans
• Japan
• Point Mutation
• Polymerase Chain Reaction (methods)
• Polymorphism, Genetic
• Stomach Neoplasms (virology)
• United States
• Viral Matrix Proteins (genetics)