Abstract
The Epstein-Barr virus (EBV) nuclear antigen 1 (EBNA1), the only viral protein consistently expressed in all EBV-associated tumors, is classified into five distinct subtypes: P-ala, P-thr, V-leu, V-val and V-pro based on the signature changes at amino acid residue 487. By now, whether the EBNA1 subtypes preferentially associate with particular malignancies or represent geographical polymorphism remains controversial. In China, most studies of the EBNA1 variations focused on nasopharyngeal carcinoma (NPC) in endemic area, among which some suggested the V-val subtype is preferentially associated with NPC. To characterize the variations of EBNA1 in NPC non-endemic area in China and to explore the association of EBNA1 variations with EBV-associated gastric carcinoma (EBVaGC) and NPC, the C-terminal sequences of EBNA1 were analyzed for 41 EBVaGC, 41 NPC biopsies and 55 throat washing (TW) samples from healthy donors in Northern China. Three major patterns of the EBNA1 variations, V-val, P-thrV and V-leuV, were observed, and V-val was the most common subtype in all the three groups, followed by P-thrV and V-leuV. The distribution of the EBNA1 subtypes among EBVaGC, NPC and healthy donors was not significantly different (P>0.05). In a...Continue Reading
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