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題 名 | Phylogenetic Analysis of Classical Swine Fever Virus in Taiwan=臺灣豬瘟病毒之親緣演化樹分析 |
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作 者 | 潘居祥; 鍾明華; 黃天祥; 劉信孚; 林士鈺; 賴秀穗; | 書刊名 | 行政院農業委員會家畜衛生試驗所研究報告 |
卷 期 | 40 民94.12 |
頁 次 | 頁91-110 |
分類號 | 437.246 |
關鍵詞 | 豬瘟病毒; 瘟疫病毒; 親緣演化樹分析; 基因分型; |
語 文 | 英文(English) |
中文摘要 | 將1989至 2003年收集到的158個豬瘟病例針對Erns及E2封套醣蛋白基因,以RT -PCR增幅此兩區間並進行核酸定序及親緣演化樹分析。雖然兩者出現類似的樹形圖,但Erns比E2具有更好的區別效果。親緣演化樹分析結果顯示,115個田間分離株歸屬於2.1亞群,又可進一步區分為2.1a及2.1b,且此兩亞群都被認為是外來型病毒株,其餘的43個田間分離株屬於3.4亞群,被認為是本土型病毒株。2.1a亞群病毒株最早發現於1994年,且於1995年以後成為田間優勢族群,然而3.4亞群病毒株盛行於1994 年以前,但自1996年以後就無法從田間分離到。過去十餘年,我們戲劇性地看到臺灣田間流行的豬瘟病毒從3.4亞群轉變成2.1a 亞群,但不是從本土型病毒株的基因突變所造成。從基因庫資料分析發現,2.1a亞群與德國分離株Paderborn及寮國分離株L67最相近,然而2.1b亞群與中國廣西省分離株最為相近。另針對完整的封套醣蛋白Erns、E1及E2以樹形圖分析27個豬瘟病毒核酸序列,結果發現此區間相較於全長的開放讀碼區(ORF)更具有良好的區別效果。 |
英文摘要 | Two envelope glycoprotein (E□ and E2) regions of the classical swine fever virus (CSFV) were amplified by RT-PCR and sequenced directly from 158 specimens collected between 1989 and 2003 in Taiwan. Phylogenetic analysis of the two regions revealed a similar tree topology and the E□ region provided better discrimination than the E2 region. One hundred and fifteen isolates out of the 158 isolates were clustered within subgroup 2.1 (further classified as 2.1a and 2.1b) and 2.2, which were considered to be likely of the introduced strains, whereas the remaining 43 isolates were clustered within subgroup 3.4 and were considered to be of the endemic strains. The subgroup 2.1a viruses were first detected in 1994 and predominated from 1995 onwards. However, subgroup 3.4 viruses were prevalent in the early years, not being isolated after 1996. We have observed a dramatic switch in genotype from subgroup 3.4 to 2.1a. The subgroup 2.1a isolates are closely related to the Paderborn and Lao isolates, whereas 2.1b isolates have a close relationship to the Chinese Guangxi isolates. The phylogenetic tree of 27 CSFV sequences based on the complete envelope glycoprotein gene (E□–E2) displayed better resolution than that based on the complete open reading frame. |
本系統中英文摘要資訊取自各篇刊載內容。