| 研究生: |
林修弘 Lin, Hsiu-Hung |
|---|---|
| 論文名稱: |
人類HBsAg 基因載體之構築及轉染雞細胞之研究 Construction of HBsAg Plasmid and Transfection of Chicken Primordial Germ Cells and Spermatozoa |
| 指導教授: |
戴謙
Tai, Chein |
| 學位類別: |
碩士 Master |
| 系所名稱: |
生物科學與科技學院 - 生物科技研究所 Institute of Biotechnology |
| 論文出版年: | 2003 |
| 畢業學年度: | 91 |
| 語文別: | 中文 |
| 論文頁數: | 70 |
| 中文關鍵詞: | 家禽 、電穿孔法 、B 型肝炎 、始基生殖細胞 、食物疫苗 |
| 外文關鍵詞: | primordial germ cells, PGCs, HBsAg, edible vaccines, chicken, electroporation |
| 相關次數: | 點閱:104 下載:1 |
| 分享至: |
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食物疫苗因為有其方便利用之特性而受到研究上的重視,而B型肝炎為中國人的一項重要傳染病,在台灣之臨床經驗及研究相當進步,正確檢驗方法亦建立已久,因此利用食物疫苗預防B型肝炎之可行性值得探討。本論文之目的即在建立利用家禽作為人類B型肝炎病毒表面抗原(HBsAg) 生物工廠的試驗方法。
試驗中將HBsAg基因構築於含CMV 啟動子之載體 pEGFP–N1中,並將所建構之 pEGFP-N1-HBsAg 載體轉殖入白色來亨雞性腺細胞,分離其中之始基生殖細胞(primordial germ cell, PGC),並注入土雞stage 13-15之胚胎背大動脈中,以得到具有轉殖基因之生殖系嵌合體的雞隻,育成後將可透過後裔毛色測定,選出帶有此一外源性基因之後裔。另將建構之 pEGFP-N1-HBsAg 載體轉殖入雞的精子中,再對母雞進行人工授精,以期得到帶有外源HBsAg 基因的雞隻。使用兩種方法進行,希望能得到表現外源基因的轉殖個體,並可利用此轉殖個體生產帶有外源蛋白的雞蛋。
在始基生殖細胞的轉殖結果發現性腺細胞中及細胞培養液中皆有HBsAg基因的存在,證實HBsAg 基因可在性腺細胞中表現。進而將轉殖後的始基生殖細胞注射入雞胚中,發現stage 26-28 的胚胎性腺亦有HBsAg 基因之存在。於 68 個雞胚胎性腺中共檢測出有 20 個樣本含有 HBsAg 基因,證實經電穿孔後的 PGC 依然保有移行到性腺的功能,而轉殖成功率約為 29.4%。
雞精子於轉殖pEGFP-N1-HBsAg後進行人工授精,並於雛雞孵出兩星期後採血萃取 DNA,PCR 檢測結果38隻雛雞中有 25 隻可檢測出HBsAg 基因,HBsAg 基因轉殖成功率為60.5%。
不論經由始基生殖細胞移轉胚胎性腺或轉殖精子所生雛雞之DNA,經PCR反應所得之複製產物,在定序分析後與HBsAg 基因相似度為96-98%,表示HBsAg 基因確實已轉入雞性腺細胞及透過精子傳至雛雞中。雛雞基因表現經ELISA分析,初步在其血清中發現有HBsAg 陽性反應,但對照血清亦出現交叉反應,顯示有待更進一步確認。
本試驗結果顯示以始基生殖細胞或雞精子轉殖pEGFP-N1-HBsAg皆可轉入HBsAg 基因,若轉殖基因個體確定可以穩定的表現外源蛋白至雞蛋中,則以每隻雞每年1kg的雞蛋蛋白質產量,應可利用此方法供應大量的藥用蛋白,或直接以雞蛋作為食物疫苗,提供非侵入性的疫苗使用方法。
Edible vaccines have been studied in transgenic plants, and it has been shown that transgenic plant containing human hepatitis B virus antigen (HBsAg) was able to induce a primary immune response. This study is going to establish the protocols for producing HBsAg by poultry egg.
The HBsAg gene was construced into the vector of pEGFP-N1 and transfected into the cells of gonads of chicken embryos at stage 26-28 by electroporation. After three days of culture, the cells pellet which contained primordial germ cells (PGCs) and the cultured medium of transfected cells were analysed for the production of HBsAg by ELISA. HBsAg was detected both in cell pellet and culture medium. In addition, freshly transfected PGCs were also transferred to the recipient embryos, by microinjection through the dorsal aorta of embryos at stage 13 to stage 16, to obtain the germ-line chimera. The gonadal ridges of day-7 embryos were analysed for the HBsAg gene by PCR and DNA sequencing. Twenty out of 68 gonad samples showed positive result in PCR analysis, and the transfection rate was 29.4% .The identities to HBsAg gene is 96%. Further studies will be needed to examine the germ-line chimerism of PGC transferred chicken by the progeny plumage test, and to detect the possibility of gene transfer if it is a donor-derived progeny from a germ-line chimera.
The pEGFP-N1-HBsAg plasmid was also transfected into the spermatozoa of chicken by electroporation. DNA of chicks obtained from the artificial insemination of transfected spermatozoa was analysed for the integration of HBsAg gene by PCR and DNA sequencing, and the serum was analysed for the production of HBsAg by ELISA. Among 38 chicks, 25 showed positive PCR reaction, indicating a 60.5% transfection rate. Although some serum samples of chicks exhibited positive reaction on ELISA analyses, false-positive results were also found in control sera. The gene expression in the serum of gene transfer chicken remained to be clarified.
The PCR analysis and DNA sequencing confirmed the positive integration of HBsAg gene in the gonads of recipient embryos after transfer of primordial gem cells, and it was also found in the 2-week chicks of first generation derived from sperm-mediated gene transfer. These results provide a potential production route of edible vaccine of HBsAg through the gene transfer in chicken.
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