<abstract xmlns="http://www.w3.org/1999/xhtml"><p>The Epstein-Barr nuclear antigen 1 <italic>(EBNA-1)</italic> gene, plays a key role in viral infection, immortalization, viral genome replication, transcription and maintenance, and is the frequently detected gene, protein in both latent and lytic stage of Epstein-Barr virus (EBV). Based on the amino acid at position 487, EBNA-1 was classified into five subtypes, including P-Ala, P-Thr, V-Val, V-Pro and V-Leu. In Vietnam, an Asian country with a high incidence, mortality rates of nasopharyngeal carcinoma (NPC), had limited research on the EBNA-1 variation. Therefore, the aim of the current study was to identify the pattern of the EBNA-1 V-Val subtype in Vietnamese NPC patients, for its value further applied in NPC patients. Fifty-eight NPC biopsy samples were collected from local patients, analyzed by nested-polymerase chain reaction (nested-PCR), sequencing and compared to a previous B95-8 prototype sequence. Four EBNA-1 subtypes, including V-Val (35/44, 79.55%), P-Ala (2/44, 4.55%), P-Thr (5/44, 11.36%), and V-Leu (2/44, 4.55%), were observed in 44/58 samples. The sequences of the V-Val subtype were compared to the B95-8 prototype, resulting in five patterns, contained seven consensus changes, including five amino acid changes at positions 487, 499, 502, 524, 594, and two silent changes at residues 520 and 553. Of these, four of five, patterns were identified as novel patterns of the V-Val subtype, showing the different changes of amino acids at positions 492, 528, 529, 553, 585 and 588, by comparison with previous studies of V-Val EBNA-1. Those data suggested the profile of variation patterns of the <italic>EBNA-1</italic> gene, related to geographic distribution, in Vietnamese NPC patients.</p></abstract>

The Epstein-Barr nuclear antigen 1 (EBNA-1) gene, plays a key role in viral infection, immortalization, viral genome replication, transcription and maintenance, and is the frequently detected gene, protein in both latent and lytic stage of Epstein-Barr virus (EBV). Based on the amino acid at position 487, EBNA-1 was classified into five subtypes, including P-Ala, P-Thr, V-Val, V-Pro and V-Leu. In Vietnam, an Asian country with a high incidence, mortality rates of nasopharyngeal carcinoma (NPC), had limited research on the EBNA-1 variation. Therefore, the aim of the current study was to identify the pattern of the EBNA-1 V-Val subtype in Vietnamese NPC patients, for its value further applied in NPC patients. Fifty-eight NPC biopsy samples were collected from local patients, analyzed by nested-polymerase chain reaction (nested-PCR), sequencing and compared to a previous B95-8 prototype sequence. Four EBNA-1 subtypes, including V-Val (35/44, 79.55%), P-Ala (2/44, 4.55%), P-Thr (5/44, 11.36%), and V-Leu (2/44, 4.55%), were observed in 44/58 samples. The sequences of the V-Val subtype were compared to the B95-8 prototype, resulting in five patterns, contained seven consensus changes, including five amino acid changes at positions 487, 499, 502, 524, 594, and two silent changes at residues 520 and 553. Of these, four of five, patterns were identified as novel patterns of the V-Val subtype, showing the different changes of amino acids at positions 492, 528, 529, 553, 585 and 588, by comparison with previous studies of V-Val EBNA-1. Those data suggested the profile of variation patterns of the EBNA-1 gene, related to geographic distribution, in Vietnamese NPC patients.

Novel patterns of the Epstein-Barr nuclear antigen (EBNA-1) V-Val subtype in EBV-associated nasopharyngeal carcinoma from Vietnam

Balkan Journal of Medical Genetics

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

The Epstein-Barr nuclear antigen 1 (EBNA-1) gene, plays a key role in viral infection, immortalization, viral genome replication, transcription and...

Novel patterns of the Epstein-Barr nuclear antigen (EBNA-1) V-Val subtype in EBV-associated nasopharyngeal carcinoma from Vietnam

Article Category: Original Article

Published Online: Aug 28, 2019

Page range: 61 - 68

DOI: https://doi.org/10.2478/bjmg-2019-0011

Keywords
Epstein-Barr nuclear antigen (EBNA-1), Epstein-Barr virus (EBV), V-val, Variation

© 2019 Thuan LD, Kha ND, Minh NT, Thuy LHA, published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Novel patterns of the Epstein-Barr nuclear antigen (EBNA-1) V-Val subtype in EBV-associated nasopharyngeal carcinoma from Vietnam

Article Category: Original Article

Published Online: Aug 28, 2019

Page range: 61 - 68

DOI: https://doi.org/10.2478/bjmg-2019-0011

KeywordsEpstein-Barr nuclear antigen (EBNA-1), Epstein-Barr virus (EBV), V-val, Variation

© 2019 Thuan LD, Kha ND, Minh NT, Thuy LHA, published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
Epstein-Barr nuclear antigen (EBNA-1), Epstein-Barr virus (EBV), V-val, Variation