To examine whether or not the regulatory sequence of chicken ovalbumin gene can drive transgene expression specifically in hen oviduct, the authors constructed an oviduct-specific expression vector (pOV), containing 3...To examine whether or not the regulatory sequence of chicken ovalbumin gene can drive transgene expression specifically in hen oviduct, the authors constructed an oviduct-specific expression vector (pOV), containing 3.0 kilobases (kb) of the 5'-flanking sequence and 3.0 kb of the 3'-flanking sequence of the chicken ovalbumin gene. Jellyfish green fluorescence protein (EGFP) reporter gene and bacterial LacZ reporter gene were respectively inserted into the downstream of the 5'-regulatory region. The recombinants were named as pOVEGFP and pOVLacZ. Two transfer systems, in vitro and in vivo, were used to verify the function of the vector. In vitro, the plasmid DNA pOVEGFP and pEGFP-N1 were transfected respectively by the polyethyle-neimine procedure into the primary chicken oviduct epithelium (PCOE) and fibroblasts cells isolated from laying hens. In vivo, the recombinant vector pOVLacZ was injected into egg-laying hens via wing vein and the tissues were collected for RT-PCR analysis. The results showed that expression of pEGFP-Nl was achieved at low level in oviduct epithelial cells and at high level in fibroblasts, but that the recombinant vector was not expressed in both cells. RT-PCR analysis showed that the LacZ gene was transcribed in the oviduct, but not in the heart, liver, kidney and spleen of the injected hens. Accordingly, the β-galactosidase activity was only detected in the oviduct magnum (116.7 mU/ml) and eggs (16.47 mU/ml). These results indicated that the cloned regulation regions of chicken ovalbumin gene could drive exogenous gene expression specifically in the oviducts of hens. In vivo gene injection via wing vein may serve as a rapid production system of recombinant proteins in chicken eggs. In addition, the cultured primary oviduct cells from laying hens were not efficient temporary expression systems for analyzing the function of regulating elements of ovalbumin gene.展开更多
为了获得鸡输卵管特异表达的卵清蛋白基因启动子,研究在采用PCR方法从鸡心基因组DNA中扩增卵清蛋白基因启动子(5OV)的基础上,将其与p Ac GFP1-N1载体连接构建真核表达载体p Ac GFP1-5OV,并采用脂质体法将p Ac GFP1-5OV分别转染鸡输卵管...为了获得鸡输卵管特异表达的卵清蛋白基因启动子,研究在采用PCR方法从鸡心基因组DNA中扩增卵清蛋白基因启动子(5OV)的基础上,将其与p Ac GFP1-N1载体连接构建真核表达载体p Ac GFP1-5OV,并采用脂质体法将p Ac GFP1-5OV分别转染鸡输卵管上皮细胞和鸡成纤维细胞后,观察其在两种细胞中的表达活性。结果表明:利用克隆获得的5OV构建的真核表达载体p Ac GFP1-5OV在转染鸡输卵管上皮细胞后第24小时,在荧光倒置显微镜下可见绿色荧光,而转染鸡成纤维细胞后未观察到GFP表达。说明所克隆的5OV具有在输卵管上皮细胞特异表达的活性。展开更多
文摘To examine whether or not the regulatory sequence of chicken ovalbumin gene can drive transgene expression specifically in hen oviduct, the authors constructed an oviduct-specific expression vector (pOV), containing 3.0 kilobases (kb) of the 5'-flanking sequence and 3.0 kb of the 3'-flanking sequence of the chicken ovalbumin gene. Jellyfish green fluorescence protein (EGFP) reporter gene and bacterial LacZ reporter gene were respectively inserted into the downstream of the 5'-regulatory region. The recombinants were named as pOVEGFP and pOVLacZ. Two transfer systems, in vitro and in vivo, were used to verify the function of the vector. In vitro, the plasmid DNA pOVEGFP and pEGFP-N1 were transfected respectively by the polyethyle-neimine procedure into the primary chicken oviduct epithelium (PCOE) and fibroblasts cells isolated from laying hens. In vivo, the recombinant vector pOVLacZ was injected into egg-laying hens via wing vein and the tissues were collected for RT-PCR analysis. The results showed that expression of pEGFP-Nl was achieved at low level in oviduct epithelial cells and at high level in fibroblasts, but that the recombinant vector was not expressed in both cells. RT-PCR analysis showed that the LacZ gene was transcribed in the oviduct, but not in the heart, liver, kidney and spleen of the injected hens. Accordingly, the β-galactosidase activity was only detected in the oviduct magnum (116.7 mU/ml) and eggs (16.47 mU/ml). These results indicated that the cloned regulation regions of chicken ovalbumin gene could drive exogenous gene expression specifically in the oviducts of hens. In vivo gene injection via wing vein may serve as a rapid production system of recombinant proteins in chicken eggs. In addition, the cultured primary oviduct cells from laying hens were not efficient temporary expression systems for analyzing the function of regulating elements of ovalbumin gene.
文摘为了获得鸡输卵管特异表达的卵清蛋白基因启动子,研究在采用PCR方法从鸡心基因组DNA中扩增卵清蛋白基因启动子(5OV)的基础上,将其与p Ac GFP1-N1载体连接构建真核表达载体p Ac GFP1-5OV,并采用脂质体法将p Ac GFP1-5OV分别转染鸡输卵管上皮细胞和鸡成纤维细胞后,观察其在两种细胞中的表达活性。结果表明:利用克隆获得的5OV构建的真核表达载体p Ac GFP1-5OV在转染鸡输卵管上皮细胞后第24小时,在荧光倒置显微镜下可见绿色荧光,而转染鸡成纤维细胞后未观察到GFP表达。说明所克隆的5OV具有在输卵管上皮细胞特异表达的活性。
