Matrix attachment regions or matrix associated regions (MARs) were special DNA sequences in chromatin of eukaryotic cells that tightly associated with the nuclear matrix or scaffold in vitro after a combination of nuc...Matrix attachment regions or matrix associated regions (MARs) were special DNA sequences in chromatin of eukaryotic cells that tightly associated with the nuclear matrix or scaffold in vitro after a combination of nuclease digestion and extraction. They were also called scaffold attachment regions(SARs) . It was found that MARs could improve the expression level and the stability of foreign genes in transgenic plants. The reason might be that a transgene flanked by MARs was transmitted into the plant cells, the MARs would attach the nuclear展开更多
We investigated the inheritance and expression of cry1A gene in transgenic maize ( Zea mays L.) by Southern blotting analysis and enzyme_linked immunosorbent assays (ELISA). The results showed that cry1A ha...We investigated the inheritance and expression of cry1A gene in transgenic maize ( Zea mays L.) by Southern blotting analysis and enzyme_linked immunosorbent assays (ELISA). The results showed that cry1A had been transmitted to progeny of transgenic maize as a single gene. Contents of cry1A insecticidal protein were significantly different among transgenic maize lines and various tissues of the same transgenic lines. High expression of cry1A protein occurred in green tissues, such as leaf and husk leaf, and low expression occurred in pith, tassel, ear pith, pollen and silk. The results also showed that the contents of cry1A insecticidal protein in leaves of transgenic maize increased with the advance of development and there was no significant difference in cry1A expression level among various generations of transgenic maize.展开更多
INTRODUCTIONHepatitis B virus (HBV) is regarded as one of themain etiologic factors involved in the developmentof human hepatocellular carcinoma (HCC).The open reading frame (orf)of X gene of HBVencoded a transactivat...INTRODUCTIONHepatitis B virus (HBV) is regarded as one of themain etiologic factors involved in the developmentof human hepatocellular carcinoma (HCC).The open reading frame (orf)of X gene of HBVencoded a transactivating factor is the evidence thatstrongly supported the notion that the X gene ofHBV DNA integrated in HCC genomic DNA couldcontribute to the carcinogenesis of liver cells byactivation of some related cellular genes展开更多
The inheritance and expression of bar gene and pinII gene were studied in three transgenic rice lines and their F2 hybrid populations, which were created through hybridization with a PGMS line, ZAU11S. By Basta painti...The inheritance and expression of bar gene and pinII gene were studied in three transgenic rice lines and their F2 hybrid populations, which were created through hybridization with a PGMS line, ZAU11S. By Basta painting, PCR analysis and determining of the inhibitory trypsin activity, the results show that bar gene and pinII gene in rice F2 population fit the simple Mendel's low of inheritance and close linkage, but a few plants in F2 have not sufficiently expressed. The wound inducible pin II gene has an expression regulated spatially and temporally, and the signal transduction pathway is not only upward, but also downward. The inducible expression of pin II in different rice transgenic lines is not completely coincident.展开更多
NR2B subunits are involved in regulating aging, in particular, age-related learning and memory deficits. We examined 19-month-old NR2B transgenic mice and their littermate controls. First, we detected expression of th...NR2B subunits are involved in regulating aging, in particular, age-related learning and memory deficits. We examined 19-month-old NR2B transgenic mice and their littermate controls. First, we detected expression of the NR2B subunit gene, Grin2b, in the neocortex of transgenic mice using real-time PCR. Next, we used microarrays to examine differences in neocortical gene expression. Pathway and signal-net analyses identified multiple pathways altered in the transgenic mice, in-cluding the P53, Jak-STAT, Wnt, and Notch pathways, as well as regulation of the actin cytoskeleton and neuroactive ligand-receptor interactions. Further signal-net analysis highlighted the P53 and insulin-like growth factor pathways as key regulatory pathways. Our results provide new insight into understanding the molecular mechanisms of NR2B regulated age-related memory storage, normal organismal aging and age-related disease.展开更多
INTRODUCTIONHepatitis B virus (HBV) belongs to the group ofhepatovirus, a major pathogen of human acute andchronic hepatitis B[1 4], which has a very closeassociation with human hepatocellular carcinoma(HCC)[5-8], For...INTRODUCTIONHepatitis B virus (HBV) belongs to the group ofhepatovirus, a major pathogen of human acute andchronic hepatitis B[1 4], which has a very closeassociation with human hepatocellular carcinoma(HCC)[5-8], For example, a statistical data from ahospital in Shanghai showed that 80% of HCCpatients were positive for HBsAg ( personalcommunication).展开更多
The mammary gland provides a novel method for producing recombinant proteins in milk of transgenic animals. A key component in the technology is the construction of an efficient milk expression vector. Here,we establi...The mammary gland provides a novel method for producing recombinant proteins in milk of transgenic animals. A key component in the technology is the construction of an efficient milk expression vector. Here,we established a simple method to construct a milk expression vector, by a combination of homologous recombination and digestion-ligation. Our methodology is expected to have the advantages of both plasmid and bacterial artificial chromosome(BAC) vectors. The BAC of mouse whey acidic protein gene(mWAP) was modified twice by homologous recombination to produce a universal expression vector, and the human lysozyme gene(hLZ) was then inserted into the vector by a digestionligation method. The final vector containing the 8.5 kb mWAP 5′ promoter, 4.8 kb h LZ genomic DNA, and 8.0 kb m WAP 3′ genomic DNA was microinjected into pronuclei of fertilized mouse embryos, to successfully generate two transgenic mouse lines that expressed recombinant human lysozyme(rhLZ) in milk. The highest expression level of rhLZ was 0.45 g$L–1, and rhLZ exhibited the same antibacterial activity as native h LZ. Our results have provided a simple approach to construct a universal milk expression vector, and demonstrated that the resulting vector regulates the expression of hLZ in milk.展开更多
目的观察C57BL/6N-Tg(1.28HBV)/Vst乙型肝炎病毒(hepatitis B virus,HBV)转基因(HBV-Tg)小鼠模型的特征,并分析HBV-Tg小鼠模型的转录组学特点。方法以10只雄性HBV-Tg小鼠为实验组,10只野生型小鼠为对照组。以血清HBV DNA、HBsAg、HBeAg...目的观察C57BL/6N-Tg(1.28HBV)/Vst乙型肝炎病毒(hepatitis B virus,HBV)转基因(HBV-Tg)小鼠模型的特征,并分析HBV-Tg小鼠模型的转录组学特点。方法以10只雄性HBV-Tg小鼠为实验组,10只野生型小鼠为对照组。以血清HBV DNA、HBsAg、HBeAg水平和肝组织HBsAg、HBcAg表达情况评价模型小鼠病毒学特征,检测血清ALT、AST,肝组织HE、天狼猩红染色及肝组织Hyp含量评估小鼠肝脏炎症及纤维化程度。两组各随机选择3例肝组织样本提取RNA进行高通量转录组测序。经R软件分析获得表达显著的差异基因,经GO和KEGG分析获得差异基因功能富集情况,再采用实时荧光定量PCR(RT-qPCR)对差异显著的基因进行验证。结果与正常组相比,模型组ALT、AST水平均有所升高,以ALT更为显著(P<0.05);模型组肝组织HE染色可见肝细胞核增大,个别肝细胞出现肿胀。天狼猩红染色结果显示,HBV转基因组汇管区及小叶间出现少量胶原沉积,呈细线状。通过筛选条件(|logFC|>2倍且P.adj<0.05)获得差异基因共计1352个,其中上调基因703个,下调基因649个。KEGG分析提示差异基因主要在PPAR信号通路、视黄醇代谢、脂肪酸降解等通路中富集(P.adj<0.05)。明显上调的差异基因主要有Cyp4a10、Cyp4a14、Acot1、Acot3、Ehhadh等,明显下调基因包括Scn5a、Apol10b、Igddc4、Cxcl1、9530077C05Rik等,经RT-qPCR验证趋势一致(P<0.05)。结论HBV-Tg小鼠具有自发纤维化的趋势,经转录组学分析,慢性乙型病毒性肝炎(chronic hepatits B,CHB)发生的潜在机制主要涉及PPAR信号通路、视黄醇代谢、脂肪酸降解、药物代谢等通路。展开更多
Expression of Human hepatitis B virus surface antigen (HBsAg) gene in plant was reported for the first time. The recombinant plasmid pRoKⅡ-HBsAg was constructed by inserting HBsAg gene into the downstream of CaMV 35S...Expression of Human hepatitis B virus surface antigen (HBsAg) gene in plant was reported for the first time. The recombinant plasmid pRoKⅡ-HBsAg was constructed by inserting HBsAg gene into the downstream of CaMV 35S promoter of binary vector pRoKⅡ and then introduced into Agrobacterium tumefaciens LBA4404. The kanamycin-resistant plants were obtained by Agrobacterium-mediated transformation system. It was shown that HBsAg gene was expressed in transgenic tobacco plants and their progenies by ELISA. The spherical particles of ψ 22 nm in the leaf extract of trangenic tobacco were observed by immunosorbent electron microscopy.展开更多
Human gastric cancer MKN-45 cells were transfectedwith pULB 3238, a plasmid carrying MVMp NS-1 genewith its original P4 promoter replaced by the glucocorticoid inducible promoter MMTV-LTR. After the integration and ex...Human gastric cancer MKN-45 cells were transfectedwith pULB 3238, a plasmid carrying MVMp NS-1 genewith its original P4 promoter replaced by the glucocorticoid inducible promoter MMTV-LTR. After the integration and expression of NS-1 gene, some of the transfectantsdied, while others remained alive, but the growth featuresof survived cells were changed. For further study on theantineoplastic function of parvoviral NS-1 protein in vivo,transgenic mice carrying NS-1 genes were established byconventional method. Among 4 founders, one of them wasfound to be able to transmit the transgene to around 50%of their offsprings. RT-PCR was performed to indicate theexpression of NS-1 gene in transgenic mice and its mRNAappeared in a variety of tissues. The expression of integrated NS-1 gene may correlate with the decreased incidence of tumor induced in vivo by chemical carcinogens.展开更多
Two transgenic mouse strains , in which the expression of human factor IX (hFIX) in the milk were different significantly, were bred, and the foreign gene integration as well as the content of hFIX in the milk were de...Two transgenic mouse strains , in which the expression of human factor IX (hFIX) in the milk were different significantly, were bred, and the foreign gene integration as well as the content of hFIX in the milk were detected by PCR, Southern blot, FISH and ELISA, respectively. The results showed that approximately 50% offsprings were transgenic positive. Foreign gene integrated in mouse chromosomes was intact. The hFIX expression of each mouse in the same strain was different, the content of hFIX in the milk was (43.32±5.41)μg/mL in FIX-33 transgenic strain and (1.16±0.45)μg/mL in FIX-124 transgenic strain. Meanwhile, the hFIX gene expression between the two strains was different remarkably (P<0.01). We conclude that the characteristics of inheritance and expression in the founder were able to be transferred to their offsprings stably.展开更多
文摘Matrix attachment regions or matrix associated regions (MARs) were special DNA sequences in chromatin of eukaryotic cells that tightly associated with the nuclear matrix or scaffold in vitro after a combination of nuclease digestion and extraction. They were also called scaffold attachment regions(SARs) . It was found that MARs could improve the expression level and the stability of foreign genes in transgenic plants. The reason might be that a transgene flanked by MARs was transmitted into the plant cells, the MARs would attach the nuclear
文摘We investigated the inheritance and expression of cry1A gene in transgenic maize ( Zea mays L.) by Southern blotting analysis and enzyme_linked immunosorbent assays (ELISA). The results showed that cry1A had been transmitted to progeny of transgenic maize as a single gene. Contents of cry1A insecticidal protein were significantly different among transgenic maize lines and various tissues of the same transgenic lines. High expression of cry1A protein occurred in green tissues, such as leaf and husk leaf, and low expression occurred in pith, tassel, ear pith, pollen and silk. The results also showed that the contents of cry1A insecticidal protein in leaves of transgenic maize increased with the advance of development and there was no significant difference in cry1A expression level among various generations of transgenic maize.
基金Projects of the Science Development Foundation of Shanghai (994919033)Tackling Key Problems in Science and Technology from the State Science and Technology Ministry(TJ99LA01)
文摘INTRODUCTIONHepatitis B virus (HBV) is regarded as one of themain etiologic factors involved in the developmentof human hepatocellular carcinoma (HCC).The open reading frame (orf)of X gene of HBVencoded a transactivating factor is the evidence thatstrongly supported the notion that the X gene ofHBV DNA integrated in HCC genomic DNA couldcontribute to the carcinogenesis of liver cells byactivation of some related cellular genes
基金sponsored by the National 863 Program of China(101-01-01-01-3)the National Natural Science Foundation of China(39870421)the Key Project in Zhejiang Province(2003C22007).
文摘The inheritance and expression of bar gene and pinII gene were studied in three transgenic rice lines and their F2 hybrid populations, which were created through hybridization with a PGMS line, ZAU11S. By Basta painting, PCR analysis and determining of the inhibitory trypsin activity, the results show that bar gene and pinII gene in rice F2 population fit the simple Mendel's low of inheritance and close linkage, but a few plants in F2 have not sufficiently expressed. The wound inducible pin II gene has an expression regulated spatially and temporally, and the signal transduction pathway is not only upward, but also downward. The inducible expression of pin II in different rice transgenic lines is not completely coincident.
基金supported by the National Natural Science Foundationof China,No.30800312 and 30970368the Specialized Research Fund for the Doctoral Program of Higher Education,No.20070269026+1 种基金the Fundamental Research Fund for the Central Universities,No.78210020Innovation Program of Shanghai Municipal Education Commission,No.10ZZ35
文摘NR2B subunits are involved in regulating aging, in particular, age-related learning and memory deficits. We examined 19-month-old NR2B transgenic mice and their littermate controls. First, we detected expression of the NR2B subunit gene, Grin2b, in the neocortex of transgenic mice using real-time PCR. Next, we used microarrays to examine differences in neocortical gene expression. Pathway and signal-net analyses identified multiple pathways altered in the transgenic mice, in-cluding the P53, Jak-STAT, Wnt, and Notch pathways, as well as regulation of the actin cytoskeleton and neuroactive ligand-receptor interactions. Further signal-net analysis highlighted the P53 and insulin-like growth factor pathways as key regulatory pathways. Our results provide new insight into understanding the molecular mechanisms of NR2B regulated age-related memory storage, normal organismal aging and age-related disease.
基金This work was supported by Projects of Tackling Key Problems in ScienceTechnology from the State Science+2 种基金Technology Ministry (TJ99-LA01) Shanghai ScienceTechnology Commission (994919033 )
文摘INTRODUCTIONHepatitis B virus (HBV) belongs to the group ofhepatovirus, a major pathogen of human acute andchronic hepatitis B[1 4], which has a very closeassociation with human hepatocellular carcinoma(HCC)[5-8], For example, a statistical data from ahospital in Shanghai showed that 80% of HCCpatients were positive for HBsAg ( personalcommunication).
基金supported by High-Level Talent Project of Foshan University (GG040965)Science and Technology Project of Foshan City (GS54207)Science Foundation of Jiangsu Province (BK20160206)
文摘The mammary gland provides a novel method for producing recombinant proteins in milk of transgenic animals. A key component in the technology is the construction of an efficient milk expression vector. Here,we established a simple method to construct a milk expression vector, by a combination of homologous recombination and digestion-ligation. Our methodology is expected to have the advantages of both plasmid and bacterial artificial chromosome(BAC) vectors. The BAC of mouse whey acidic protein gene(mWAP) was modified twice by homologous recombination to produce a universal expression vector, and the human lysozyme gene(hLZ) was then inserted into the vector by a digestionligation method. The final vector containing the 8.5 kb mWAP 5′ promoter, 4.8 kb h LZ genomic DNA, and 8.0 kb m WAP 3′ genomic DNA was microinjected into pronuclei of fertilized mouse embryos, to successfully generate two transgenic mouse lines that expressed recombinant human lysozyme(rhLZ) in milk. The highest expression level of rhLZ was 0.45 g$L–1, and rhLZ exhibited the same antibacterial activity as native h LZ. Our results have provided a simple approach to construct a universal milk expression vector, and demonstrated that the resulting vector regulates the expression of hLZ in milk.
文摘Expression of Human hepatitis B virus surface antigen (HBsAg) gene in plant was reported for the first time. The recombinant plasmid pRoKⅡ-HBsAg was constructed by inserting HBsAg gene into the downstream of CaMV 35S promoter of binary vector pRoKⅡ and then introduced into Agrobacterium tumefaciens LBA4404. The kanamycin-resistant plants were obtained by Agrobacterium-mediated transformation system. It was shown that HBsAg gene was expressed in transgenic tobacco plants and their progenies by ELISA. The spherical particles of ψ 22 nm in the leaf extract of trangenic tobacco were observed by immunosorbent electron microscopy.
文摘Human gastric cancer MKN-45 cells were transfectedwith pULB 3238, a plasmid carrying MVMp NS-1 genewith its original P4 promoter replaced by the glucocorticoid inducible promoter MMTV-LTR. After the integration and expression of NS-1 gene, some of the transfectantsdied, while others remained alive, but the growth featuresof survived cells were changed. For further study on theantineoplastic function of parvoviral NS-1 protein in vivo,transgenic mice carrying NS-1 genes were established byconventional method. Among 4 founders, one of them wasfound to be able to transmit the transgene to around 50%of their offsprings. RT-PCR was performed to indicate theexpression of NS-1 gene in transgenic mice and its mRNAappeared in a variety of tissues. The expression of integrated NS-1 gene may correlate with the decreased incidence of tumor induced in vivo by chemical carcinogens.
基金国家"8 6 3"高技术项目基金资助 (No .2 0 0 1AA2 130 11)上海市现代生物与新药产业发展基金资助 (No .9943190 4)上海市卫生局青年基金资助 (No.0 0 4Y10 )~~
文摘Two transgenic mouse strains , in which the expression of human factor IX (hFIX) in the milk were different significantly, were bred, and the foreign gene integration as well as the content of hFIX in the milk were detected by PCR, Southern blot, FISH and ELISA, respectively. The results showed that approximately 50% offsprings were transgenic positive. Foreign gene integrated in mouse chromosomes was intact. The hFIX expression of each mouse in the same strain was different, the content of hFIX in the milk was (43.32±5.41)μg/mL in FIX-33 transgenic strain and (1.16±0.45)μg/mL in FIX-124 transgenic strain. Meanwhile, the hFIX gene expression between the two strains was different remarkably (P<0.01). We conclude that the characteristics of inheritance and expression in the founder were able to be transferred to their offsprings stably.
