Frequent presence of subtype A virus in Epstein–Barr virus-associated malignancies

• Published in: Pathology 2002, Vol.34 (5), p.446-450
• Main Authors: Peh, Suat-Cheng, Kim, Lian-Hua, Poppema, Sibrand
• Format: Article
• Language: English
• Subjects: Adolescent; Adult; Biological and medical sciences; Carcinogenesis, carcinogens and anticarcinogens; Carcinoma - pathology; Carcinoma - virology; Child; DNA, Neoplasm - analysis; EBV subtypes; Electrophoresis, Agar Gel; Epstein-Barr virus; Epstein-Barr Virus Infections - complications; Epstein-Barr Virus Infections - pathology; Epstein-Barr Virus Nuclear Antigens - analysis; Epstein-Barr Virus Nuclear Antigens - genetics; Epstein–Barr virus (EBV); Herpesvirus 4, Human - classification; Herpesvirus 4, Human - genetics; Herpesvirus 4, Human - isolation & purification; Humans; In Situ Hybridization; Lymph Nodes - pathology; Lymph Nodes - virology; Lymphoma - pathology; Lymphoma - virology; lymphomas; Malaysia; Medical sciences; nasopharyngeal carcinomas; Nasopharyngeal Neoplasms - pathology; Nasopharyngeal Neoplasms - virology; nested PCR; Polymerase Chain Reaction; Sensitivity and Specificity; Tropical medicine; Tumors; Viral Proteins; Viruses
• ISSN: 0031-3025; 1465-3931
• DOI: 10.1080/0031302021000009379

Epstein–Barr virus (EBV) is associated with many human malignancies. It is implicated in a pathogenetic role in some of these tumours. Two subtypes, type A and B have been identified on the basis of DNA sequence divergence in the nuclear protein genes (EBNA) 2, 3, 4 and 6. They differ in their transforming efficiency and prevalence pattern in different geographical locations. We aimed to identify the virus subtype infection pattern in our EBV-associated diseases. Paraffin-embedded tissue from 38 lymphomas (17 Hodgkin’s, 14 Burkitt’s, four T cell and 3 B cell non-Hodgkin’s lymphomas) and 14 nasopharyngeal carcinomas (NPC) were studied, with 12 reactive lymph nodes and tonsils as normal control. EBER in situ hybridisation was performed to confirm EBV association in the tumour cells. A nested polymerase chain reaction (PCR) protocol was employed using two pairs of consensus primers which flanked a 105-bp deletion in the type A virus. U2 region encoding for EBNA-2 was chosen as the target of amplification, with cell lines B95.8 and AG876 serving as positive controls for types A and B virus, respectively. All cases showed presence of type A virus, consistently detected with nested PCR protocol but not with single step PCR. There was no type B virus or mix infections detected. Nested PCR technique has successfully increased the sensitivity of EBV subtype detection, and type A virus is the prevalent strain associated with human diseases in Malaysia.