Construction and Secretory Expression of β-Galactosidase Gene from Lactobacillus Bulgaricus in Lactococcus Lactis

Objective This study is to examine the secretion effects of β-galactosidase in Lactococcus lactis.Methods The usp45 and β-galactosidase genes were cloned and inserted into plasmid pMG36e to obtain the recombinant plasmid pMG36e-usp-lacZ.This recombinant plasmid was transformed into both Escherichia coli DH5α and L.lactis MG1363.The enzyme activity,gene sequencing,SDS-PAGE and hereditary stability were assessed and studied.Results The lacZ gene inserted into plasmids pMG36e-usp-lacZ was 99.37% similar to the GenBank sequence,and SDS-PAGE revealed an evident idio-strap at 116 KDa between L.lactis MG1363/pMG36eusp-lacZ in both supernatant and cell samples.β-Galactosidase activity measured 0.225 U/mL in L.lactis pMG36e-usp-lacZ transformants,and its secretion rate was 10%.The plasmid pMG36e-usp-lacZ appeared more stable in MG1363.Conclusion The authors concluded that these new recombinant bacteria well expressed and secreted β-galactosidase,indicating that the β-galactosidase expression system was successfully constructed,and this might provide a new solution for management of lactose intolerance specifically and promote the use of gene-modified organisms as part of the food-grade plasmid in general.

RNAi Plasmid Construction of PttGA 20-oxidase Gene

[Objective] Genetic Engineering technology was used to regulate the expression of PttGA20-oxidase gene thus restrained plant height growth and internode elongation for cultivating dwarfed plant.[Method] Based on the RNAi principle,the gene specific sequences of PttGA20-oxidase in the antisense and sense orientations interrupted by a gene sequence from GUS were cloned into a binary vector pBI121.The selection marker gene npt Ⅱ was replaced with bar gene to RNAi plasmid.[Result] After undergone different endonuclease restrictions,the constructed constraint vector released different segments whose sizes were similar to that of target segment,which demonstrated that the RNAi plasmid of PttGA20-oxidase gene was successfully constructed.[Conclusion] The experiment provided a new way for culturing dwarfed plant.

In vitro construction of a recombinant human embryonic brain-derived neurotrophin-4 gene and pEGFP-N1 vector

BACKGROUND： Neurotrophin-4 （NT-4） can promote neuronal growth, development, differentiation, maturation, and survival. NT-4 can also improve recovery and regeneration of injured neurons, but cannot pass through the blood-brain barrier, which limits its activity in the central nervous system. Delivering NT-4 into the central nervous system v/a cells or vectors may have therapeutic benefit. OBJECTIVE： To construct a recombinant vector with a human embryonic brain-derived NT-4 gene and pEGFP-NI. DESIGN, TIME AND SETTING： Neural genetic engineering experiment. The study was performed at the Neuroscience Institute of Kunming Medical College between October 2007 and March 2008. MATERIALS： The pEGFP-N1 plasmid vector was provided by Kunming Institute of Zoology, Chinese Academy of Sciences; embryonic brain tissues were provided by the First Affiliated Hospital of Kunming Medical College. TRIzol RNA extraction Kit was purchased from Sigma （USA）, One Step RNA PCR Kit （AMV） etc. were from Takara （Dalian, China）. METHODS： Total RNA was extracted from human embryonic brain tissues using Trizol. The agarose gel electrophoresis showed two bands： 18 S and 28 S, which were essential subunits of total RNA. The human NT-4 DNA was obtained via RT-PCR and inserted into the pEGFP-N1 vector using ligation and transformation reaction. MAIN OUTCOME MEASURES： The sequencing results of the DNA in the recombinant of NT-4- pEGFP-NI. RESULTS： The NT-4-pEGFP-N1 vector was sequence-verified and showed the expected molecular weight. CONCLUSION： The recombinant of NT-4-pEGFP-N1 was constructed successfully in vitro.

Expression Vector Construction and Genetic Transformation of <i>Rosa rugosa β</i>-l,3-Glucanase Gene (<i>RrGlu</i>)

In order to lay a foundation for researching the function of Rosa rugose (R. rugosa) RrGlu gene, the RrGlu gene was amplified from the styles of R. rugosa “Tanghong”, a gene expression vector named PBI121-RrGlu was constructed and the vector was introduced into tobacco with the agrobacterium-mediated method. PCR results showed that the RrGlu gene was integrated into the tobacco genome.

Comparison of Two Construction Methods of Targeting Gene of Haemophilus parasuis

Haemophilus parasuis is one kind of constant bacteria in porcine upper respiratory tract, and it can cause multiple serositis, arthritis and other diseases under certain conditions. Due to lack of efficient genetic operating system, its pathogenic mechanism is not very clear. Ligation with DNA ligase and fusion PCR were used to construct targeting hhdA gene of Haemophilus parasuis, respectively. The fidelity, application scope, operation and conditions of the constructed fusion fragments were compared. The results showed that construction with DNA ligase was more mature technology as manifested by more stable conditions and more extensive application. The fusion PCR method had high fidelity and simple operation, and the transformation rate was 9.5 times as high as that of ligation with DNA ligase. For this reason, this method was more suitable for construction of multi-fragment targeting genes. The study lays a foundation for establishing an efficient operating system of targeting gene of Haemophilus parasuis in the future.

Molecular Clone, Expression, and Prediction of Construction and Function to Key Genes of Interleukin Family of Porcine

This research was to clone, express, and analyze the structure and function of major molecules of porcine interleukin family. Genes of porcine interleukin family were cloned by RT-PCR from stimulated porcine PBMC by LPS and PHA, and then expressed in E. coli, and the structure and function of these molecules were predicted by ExPASY. The results showed that genes of IL-4, IL-6, and IL-18 were successfully cloned and expressed. Furthermore, the expression products of recombinant IL-4 and IL-6 both have multiple biological activities. By analyzing these genes with the NCBI/GenBank data, the homologies of the nucleotide acid sequence are 99.25, 99.21, and 100%, respectively, and have great species differences when compared with other animal species. The results of the prediction showed that all these molecules contain several phosphorylation, glycosylation, protein kinase, and signal transduction bonding sites in secondary structure, and all are compact globularity protein in space configuration. These characteristics of structure are the basis for their multiple biological functions. The genes, structure and function of key molecular of porcine interleukin family were successfully cloned, expressed, and analyzed in this paper.

Construction of Prokaryotic Expression Vector for At4g12500 Gene of Arabidopsis

[ Objective] This study aimed to construct the prokaryotic expression vector for Arab/dops/s At4g12500 gene. [ Method] Genomic DNA of wild-type Ar- abidopsis Cold） was extracted as the template for amplification of At4g12.500 gene with PCR technology. The target fragment was double-digested with BamH I and Xho I, and ligated with prokaryotic expression vector pET-28a. [Result] Prokaryotic expression vector pEI28a-At4gI2500 was successfully constructed and trans- formed into Escherichia coli expression strain BL21 （DE3）. [ Conclusion] This study laid the foundation for subsequent expression and functional analysis of At4g12500 gene.

Construction of RNAi Expression Vector against Riboflavin Synthase Gene

[Objective] This study aimed to construct RNAi expression vector against r/boflavin synthase （RS） gene. [Method] By using the primers designed based on RS gone coding sequence that was screened from Arabidopsis cDNA library, the 476 bp cDNA fragment of RS was amplified from pGADTT-RS recombinant plasmid, and then cloned into pUCm-T vector to obtain pUCm-RS. Two RS fragments （476 bp） were obtained through digesting pUCm-RS with restriction enzymes PstI/BamHI and PstI / Xhol, and then respectively connected into vector pBSSK-in to form pBSSK-RS-in-RS, in which the two RS fragments were inverted re- peats. Finally, the transform unit RS-intron-RS, got by digesting vector pBSSK-RS-in-RS with Sac I and Kpn I, was ligated into expression vector pCAMBIA1301 to obtain the RS gene silencing vector. [ Result] The restriction enzyme digestion sequencing analysis proved that the RS gene silencing vector was successfully con- structed. [ Conclusion] This study may provide a basic material for further studies on the bio-function of RS gene and the mechanism of signal transduction induced by HpaGxoo in plant.

蒜氨酸靶向调控表皮生长因子受体和犬尿氨酸酶治疗类风湿性关节炎的分子机制

背景:蒜氨酸作为大蒜中的主要活性成分具有抗炎和抗氧化作用,但蒜氨酸改善类风湿性关节炎的作用和机制仍不清楚。目的:利用基因表达数据分析类风湿性关节炎的差异表达基因,探讨蒜氨酸在类风湿性关节炎中的调控作用。方法:从GSE45291和GSE93777数据集中收集类风湿性关节炎的基因表达数据,进行差异表达分析。对两套数据中的共同差异表达基因进行共表达网络分析,识别与类风湿性关节炎相关性最高的模块基因,进行功能富集分析。通过SwissTargetPrediction数据库预测蒜氨酸的靶向调控基因,并与差异表达基因行交集分析,计算差异表达靶基因的受试者工作特征曲线下面积。将人永生化类风湿性关节炎滑膜成纤维细胞接种于孔板内培养24 h后分5组处理:对照组不进行任何处理,阳性药组加入甲氨蝶呤,蒜氨酸低、中、高质量浓度组分别加入20,80,160μg/mL的蒜氨酸,处理48 h后,CCK-8法检测细胞活性,TUNEL法检测细胞凋亡,ELISA法检测氧化应激和炎症因子水平,JC-1法检测线粒体膜电位变化,RT-qPCR和Western Blot检测靶基因及相关信号通路的表达。结果与结论:(1)在GSE45291和GSE93777数据集中共鉴定出6 487个共同的差异表达基因,并获得了12个共表达模块,magenta模块与类风湿性关节炎的相关性最高,模块基因主要富集于磷酯酰肌醇3-激酶/蛋白激酶B(PI3K/AKT)信号通路。(2)通过数据库预测发现7个差异表达基因被蒜氨酸靶向调控,其中表皮生长因子受体在GSE45291数据集中的受试者工作特征曲线下面积值最大,犬尿氨酸酶在GSE93777数据集中的受试者工作特征曲线下面积值最大。(3)与对照组比较,其他4组类风湿性关节炎滑膜成纤维细胞活性降低,细胞凋亡数量增加,活性氧、丙二醛、白细胞介素6、白细胞介素1β水平均降低,线粒体膜电位均升高,表皮生长因子受体、犬尿氨酸酶、线粒体动力相关蛋白1mRNA与蛋白表达均降低,线粒体融合蛋白2 mRNA与蛋白表达均升高,p-AKT、p-PI3K蛋白表达均升高。(4)结果表明,蒜氨酸通过调控表皮生长因子受体和犬尿氨酸酶等靶基因发挥潜在的类风湿性关节炎治疗作用。

永恒蛋白基因/周期蛋白基因介导多条通路在昼夜节律中的作用

背景:昼夜节律与大多数哺乳动物及昆虫的生命活动息息相关。永恒蛋白基因作为编码永恒蛋白基因-周期蛋白基因复合物的关键成分在产生昼夜节律过程中起到十分关键的作用,但其在昼夜节律中的作用机制仍不清楚。目的:通过整理永恒蛋白基因、周期蛋白基因、昼夜节律、环境及隐花色素基因之间的关系,更加全面地认识昼夜循环的入核、积累机制及环境对昼夜节律的影响。方法:应用计算机在Web of Science核心合集、PubMed数据库及CNKI中进行检索,以“永恒蛋白基因,周期蛋白基因,昼夜节律,环境”为中文检索词,以“Timeless,Period,circadian rhythm,environment”为英文检索词,通过全文阅读逐步排除非相关文献,最终纳入126篇文献进行综述。结果与结论:在昼夜时钟中,昼夜自发输出周期蛋白kaput和CYCLE激活永恒蛋白基因/周期蛋白基因,永恒蛋白基因调控周期蛋白基因的入核机制及稳定性,而周期蛋白基因也可以通过一些机制单独入核。酪蛋白激酶2、Shaggy蛋白激酶及双倍时间基因都可以通过磷酸化永恒蛋白基因/周期蛋白基因的方式来调节昼夜节律,参与转录。隐花色素基因介导的永恒蛋白基因降解对转录的完整性有十分重要的作用。环境因素、膳食方式等外界因素均可以通过永恒蛋白基因/周期蛋白基因对昼夜节律产生影响,而限时进食可作为一种改善昼夜节律紊乱的有效方法。

基于景观基因谱系的地质文化村“书卷式”建设模式——以莲塘地质文化村为例

笔者等依据景观基因谱系理论,对景观基因谱系和“书卷式”建设模式进行研究,构建了基于二者内在关系的地质文化村“书卷式”建设模式。该模式遵循“目标、意义、功能、特性”的理论框架,以基因信息的“传承路径”和“文化叙事”两种方式进行了系统的构建。在此基础上,以浙江省江山市莲塘地质文化村为例,将地质基因作为其主体基因谱系,构建可视可游可及的地质基因书卷模式;将文化基因作为其附着基因,其中内在唯一性基因谱系构建为当地民俗文化活动的书卷模式,外在唯一性基因谱系构建为当地特色明显的村庄形态及建筑风格的书卷模式。以期为地质科普、地质文化村建设提供理论和现实依据,为乡村振兴做出贡献。

针刀治疗膝骨关节炎大鼠的转录组测序及实验验证

背景:针刀治疗膝骨关节炎临床疗效确切,但针刀干预膝骨关节炎在转录组水平上的调节机制仍未明确。目的:通过针刀干预骨关节炎大鼠,对软骨样本进行转录组测序和生物信息学分析并加以验证,揭示针刀干预骨关节炎大鼠的作用机制。方法:采用随机数字表法将48只SD大鼠随机分为针刀组、模型组和假手术组,每组16只。针刀组、模型组采用内侧半月板失稳术建立骨关节炎模型,造模6周后针刀组大鼠每周进行1次针刀治疗,共治疗4周。治疗4周后,对各组大鼠膝关节进行Micro CT扫描,对关节软骨进行苏木精-伊红染色、番红O-固绿染色及Mankin评分,采用Elisa法检测血清炎症因子水平,对软骨样本进行转录组测序,采用R软件进行差异基因生物信息学分析,采用蛋白互作网络和Cytoscape软件筛选核心靶点并进行RT-qPCR验证。结果与结论:①相较于假手术组,模型组大鼠关节软骨表面粗糙不平、关节间隙狭窄,关节表层结构破坏,Mankin评分升高,血清白细胞介素6、肿瘤坏死因子α、基质金属蛋白酶13水平显著上升(P<0.05);与模型组相比,针刀组大鼠关节软骨表面较为光滑,关节间隙增宽,关节表面轻微不规则,Mankin评分降低,血清白细胞介素6、肿瘤坏死因子α、基质金属蛋白酶13水平显著降低(P<0.05)。②基因本体论及京都基因组和基因组百科全书分析涉及蛋白分解代谢、自噬、丝裂原活化蛋白激酶、核因子kB及Wnt信号通路等,蛋白互作网络及Cytoscape筛选出共济失调毛细血管扩张突变、类Myb SWIRM和MPN结构域蛋白1、热休克蛋白90α1、NIPBL粘连蛋白负载因子4个关键基因。③模型组大鼠关节软骨中共济失调毛细血管扩张突变、类Myb SWIRM和MPN结构域蛋白1、热休克蛋白90α1、NIPBL粘连蛋白负载因子mRNA表达均低于假手术组(P<0.05),针刀组大鼠关节软骨中共济失调毛细血管扩张突变、类Myb SWIRM和MPN结构域蛋白1、热休克蛋白90α1、NIPBL粘连蛋白负载因子mRNA表达均高于模型组(P<0.05)。④针刀干预可能作用于丝裂原活化蛋白激酶、核因子kB及Wnt等信号通路来促进软骨修复,并与共济失调毛细血管扩张突变、类Myb SWIRM和MPN结构域蛋白1、热休克蛋白90α1、NIPBL粘连蛋白负载因子基因的表达密切相关。

骨关节炎过程中葡萄糖代谢基因的筛选与验证

背景:葡萄糖代谢过程在维持机体正常生理功能中扮演着至关重要的角色,当葡萄糖代谢出现紊乱时,可能会导致一系列的健康问题。目前,骨关节炎中葡萄糖代谢相关分子机制和潜在基因靶点有待进一步研究。目的:通过生物信息学方法分析骨关节炎中葡萄糖代谢相关基因,并利用体外细胞实验加以验证,以期为葡萄糖代谢角度防治骨关节炎提供新的思路。方法:使用GEO数据库和GeneCards数据库筛选出骨关节炎差异表达基因和葡萄糖代谢相关基因,两者取交集,得到骨关节炎和葡萄糖代谢共同相关的基因集合,采用GO和KEGG富集分析筛选这些基因的功能和通路。为了进一步研究这些基因之间的相互作用,构建蛋白-蛋白互作网络,并利用Cytoscape软件的计算方法来识别骨关节炎葡萄糖代谢的关键基因(Hub基因)。此外,采用CIBERSORT算法对GSE98918数据集免疫细胞浸润分析。最后通过体外细胞实验验证Hub基因的表达情况。结果与结论:①共获得134个骨关节炎葡萄糖代谢相关基因。②GO富集分析表明其主要参与对有毒物质的反应、炎症反应的正调节、对脂多糖的反应等过程。③KEGG富集分析表明其与PI3K-Akt信号通路、白细胞介素17信号通路、糖尿病并发症中的AGE-RAGE信号通路密切相关。④免疫浸润分析得到的主要免疫浸润细胞为巨噬细胞、单核细胞、静息状态下的NK细胞、调节性T细胞、CD8+T细胞。⑤体外细胞实验结果显示:相比于对照组,实验组中Hub基因SERPINF1、TAC1、GLUL、APOE、TMEM176A表达具有显著差异,HLA-DRA的mRNA表达没有统计学意义。结果显示:SERPINF1、TAC1、GLUL、APOE、TMEM176A可作为骨关节炎葡萄糖代谢的关键基因,有望成为防治骨关节炎的新靶点。

Construction and Identification of Plasmid pTA-TUB2

An about 1.40 Kb target gene fragment was yielded by PCR amplification with the plasmid pRB 129,which was identified by restriction enzyme digestion that the PCR product was TUB2 gene.The gene was digested by the restriction enzyme and was linked with pTA plasmid to construct pTA TUB2 plasmid.The plasmid was transformed into Chaetomium spp.by PEG method and the transformation rate was 27/(2×10 5) and it is nine times higher than that of pRB 129.The transformants can grow on the PDA containing 1 000 μg·mL -1 carbendazim,which is 1 000 times higher than the original Chaetomium spp.The resistance was stable after 10 times transfer on non selective medium.

猪传染性胃肠炎病毒S、N基因DNA疫苗载体构建及其免疫原性

【目的】构建猪传染性胃肠炎病毒(transmissible gastroenteritis virus,TGEV)S、N基因的DNA疫苗载体,并进行免疫原性试验,为猪传染性胃肠炎(transmissible gastroenteritis,TGE)的防控和DNA疫苗研究提供技术支撑和基础数据。【方法】扩增S基因的A位点、D位点和N基因,并将N基因(单独)、A位点和D位点(融合)克隆至pCDNA3.1-His-C构建重组疫苗载体,运用生物信息学软件预测分析S(A-D)蛋白、N蛋白二级结构组成、三级构像、亚细胞定位和优势B细胞抗原表位。将构建成功的重组载体分别转染至PK-15细胞进行间接免疫荧光试验,运用共聚焦检测重组蛋白的表达分布情况。将重组疫苗载体单独或联合免疫小鼠,运用间接ELISA检测IgG抗体水平。【结果】扩增出S基因的A位点、D位点和N基因,大小分别为498、606、1149 bp。构建了A位点与D位点(融合)、N基因(单独)的DNA疫苗重组载体p-S(A-D)-His和p-N-His。生物信息学软件预测分析发现TGEV感染宿主细胞时N蛋白主要定位于细胞核和线粒体,S(A-D)蛋白主要定位于细胞质和线粒体,S(A-D)蛋白具有7个优势B细胞抗原表位,N蛋白具有8个优势B细胞抗原表位。重组载体p-S(A-D)-His和p-N-His均在PK-15细胞内成功表达,且S(A-D)-His和N-His在PK-15细胞核和细胞质中均有分布。重组疫苗载体免疫小鼠后,免疫效果由高至低依次为p-N-His>p-S(A-D)-His+p-N-His>p-S(A-D)-His。【结论】本研究构建了TGEV的S、N基因的DNA疫苗载体,免疫小鼠后均产生了较强的特异性抗体,为TGEV的核酸疫苗的研制提供了基础材料和依据。

Study on Genetic Inactivation Bacterial Ghosts of Pasteurella multocida based PhiX174 Gene E Lysis Cassette Mediated

[Objective] To study on genetic inactivation bacterial ghosts of Pasteurella multocida based PhiX174 gene E lysis cassette mediated. [ Method ] Recombinant pPBA1100-e was constructed by which the gene E of bacteriophage Phix174 and temperature sensitivity expressing control system hybridized with plasmid pPBA1100 by genetic engineering method. Recombinant was transformed to Pasteurella multocida and lysis gene E expressed by temperature induction. Recombinant was detected by restriction endonuclease. Cell morphology of bacterial ghost of Pasteurella mul- tocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysis. I Result~ The results indicated that the recombination plasmid presented three bands by restriction endonuclease and agarose electrophoresis and that molecular weight of every band ac- corded with theoretical value. The result of SEM observing showed that recombination plasmid expressed successfully in P. multocida and produced bacterial ghost. The result of CFU detecting demonstrated that inactivation ratio of P. multocida reached 99 per cent. ~Conclusion~ This study pro- vided technical bases for the preparation of antigen vaccine of natural bacterial outer membrane protein.

吐鲁番传统聚落景观基因谱系构建

吐鲁番市目前正处于城乡建设与旅游业快速发展的时期,然而部分传统聚落原有风貌损毁、结构遭破坏,聚落景观面临严重的保护压力。景观基因理论从地理环境、历史文化等方面对传统聚落进行解析,为系统保护传统聚落景观提供新的视角。文章以吐鲁番传统聚落为研究对象,依据景观基因理论,识别吐鲁番传统聚落的环境特征、布局特征、建筑特征和文化特征景观基因。运用景观基因编码技术将景观基因编码,构建传统聚落景观基因编码模型,形成吐鲁番传统聚落景观基因信息库,有利于吐鲁番传统聚落的本土化景观营造与建设,为吐鲁番传统聚落系统化保护与发展提供科学理论指导。

红色文化基因融入大学生思想道德建设的对策研究

红色文化是中华优秀传统文化的重要组成部分,是中国革命道路上的重要历史遗产。红色文化基因汲取了中华文化的精髓,体现着深刻的人民意志和革命精神,具有非常重要的历史、思想和文化价值,它蕴含的价值观和精神内涵融入大学生思想道德建设具有重要的现实意义。通过探讨红色文化基因融入大学生思想道德建设的时代价值、成就与困境,进一步寻求红色文化基因融入大学生思想道德建设的对策,为高校加强大学生思想政治教育提供参考和借鉴。

海岛民间非遗舟山渔民画文化基因图谱建构与数字化传承发展路径

利用数字技术对舟山渔民画的图形符号、色彩体系、地域属性、时代特征等核心元素进行系统识别、基因提取和分类排序,借鉴生物基因遗传的基本原理,通过构建舟山渔民画的文化基因图谱,对其文化基因进行归类并找到与之对应的适宜数字化时代和现代海洋海岛生境的传承路径,从而为海岛民间非遗舟山渔民画文化基因的数字化保护与传承提供创新路径和借鉴依据。