tailieunhanh - Báo cáo y học: "Sequence analysis of the Epstein-Barr virus (EBV) BRLF1 gene in nasopharyngeal and gastric carcinomas"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Sequence analysis of the Epstein-Barr virus (EBV) BRLF1 gene in nasopharyngeal and gastric carcinomas | Jia et al. Virology Journal 2010 7 341 http content 7 1 341 VIROLOGY JOURNAL RESEARCH Open Access Sequence analysis of the Epstein-Barr virus EBV BRLF1 gene in nasopharyngeal and gastric carcinomas 1 1 Z- 1 2 71 r I- 3 1 Yuping Jia Yun Wang Yan Chao Yongzheng Jing Zhifu Sun Bing Luo Abstract Background Epstein-Barr virus EBV has a biphasic infection cycle consisting of a latent and a lytic replicative phase. The product of immediate-early gene BRLF1 Rta is able to disrupt the latency phase in epithelial cells and certain B-cell lines. The protein Rta is a frequent target of the EBV-induced cytotoxic T cell response. In spite of our good understanding of this protein little is known for the gene polymorphism of BRLF1. Results BRLF1 gene was successfully amplified in 34 EBV-associated gastric carcinomas EBVaGCs 57 nasopharyngeal carcinomas NPCs and 28 throat washings TWs samples from healthy donors followed by PCR-direct sequencing. Fourteen loci were found to be affected by amino acid changes 17 loci by silent nucleotide changes. According to the phylogenetic tree 5 distinct subtypes of BRLF1 were identified and 2 subtypes BR1-A and BR1-C were detected in 51 119 50 119 of samples respectively. The distribution of these 2 subtypes among 3 types of specimens was significantly different. The subtype BR1-A preferentially existed in healthy donors while BR1-C was seen more in biopsies of NPC. A silent mutation A G was detected in all the isolates. Among 3 functional domains the dimerization domain of Rta showed a stably conserved sequence while DNA binding and transactivation domains were detected to have multiple mutations. Three of 16 CTL epitopes NAA QKE and ERP were affected by amino acid changes. Epitope ERP was relatively conserved epitopes NAA and QKE harbored more mutations. Conclusions This first detailed investigation of sequence variations in BRLF1 gene has identified 5 distinct subtypes. Two subtypes BR1-A and BR1-C are the .

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