Establishment and Application of a Real-time PCR Method for Detecting stx2 Gene in Shiga Toxin-producing Escherichia coli(STEC)

[Objective] This study aimed to establish a real-time PCR method for de- tecting stx2 gene in Shiga toxin-producing E. coli （STEC）. [Method] According to the known STEC stx2 gene sequences published in GenBank, PCR primers and probes were designed based on the conserved region to construct recombinant plasmid as a positive template, thus optimizing the reaction conditions and establishing the real- time PCR method. [Result] A standard curve was established based on the opti- mized real-time PCR system, indicting a good linear correlation between the initial template concentration and Ct value, with the correlation coefficient F^e of above 0.995. The established method had a good specificity, without non-specific amplifica- tion for 10 non-STEC intestinal bacterial strains; the detection limit of initial template was 1.0x102 copies/μI, indicating a high sensitivity; furthermore, the coefficients of variation within and among batches were lower than 1% and 5% respectively, sug- gesting a good repeatability. [Conclusion] In this study, a real-time PCR method was successfully established for detecting STEC stx2 gene, which provided technical means for rapid detection of STEC in samples.

三酰甘油与APOE基因多态性在短暂性脑缺血发作患者发生急性脑梗死中的交互作用研究

目的探讨三酰甘油(TG)与载脂蛋白E(APOE)基因多态性在短暂性脑缺血发作(TIA)患者发生急性脑梗死中的交互作用。方法对2019年1月—2021年6月349例TIA进行6个月随访,根据是否发生急性脑梗死分为发生组、未发生组,比较2组一般资料、总胆固醇(TC)、低密度脂蛋白胆固醇(LDL-C)、高密度脂蛋白胆固醇(HDL-C)、TG、APOE基因多态性,并比较不同TG水平患者APOE基因多态性,使用多因素Logistic回归分析TIA发生急性脑梗死的影响因素,使用交互作用系数γ分析TG与APOE基因多态性的交互作用。结果随访6个月,共45例(12.89%)TIA患者发生急性脑梗死。发生组TG高于未发生组(P<0.01)。发生组及TG升高患者E3/3基因型、ε3等位基因频率分别低于未发生组及TG正常患者,E3/4基因型、ε4等位基因频率分别高于未发生组及TG正常患者(P<0.05)。校正TIA持续时间、TIA发作频率后,TG、APOE基因型E3/3、E3/4及等位基因ε4仍是TIA发生急性脑梗死的独立影响因素(P<0.01)。TG升高与APOE基因型E3/4在TIA发生急性脑梗死中呈正向交互作用,且交互作用符合次相乘模型。结论TG升高与APOE基因型E3/4在TIA发生急性脑梗死中呈正向交互作用,且交互作用符合次相乘模型,TG升高可增强APOE基因型E3/4对TIA发生急性脑梗死的易感性。

载脂蛋白E基因多态性与颅脑损伤后认知功能障碍的相关性研究

目的探讨载脂蛋白E(ApoE)基因多态性与颅脑损伤后认知功能障碍的关系。方法前瞻性选取2018年1月—2023年2月重庆医科大学附属巴南医院神经外科收治的57例颅脑损伤后认知功能患者为认知功能障碍组,同期收治的不伴有认知功能障碍的颅脑损伤患者51例为对照组。取患者抗凝静脉全血2~4 mL进行核酸提取,使用APOE基因检测试剂盒,采用多重荧光PCR法对提取的DNA进行APOE基因ε2、ε3和ε4位点的检测,比较两组基因型分布差异。用Logistic回归分析对两组患者一般资料及携带ε2、ε3和ε4基因进行筛选,得出颅脑损伤后认知功能障碍的基因危险因素。结果两组患者基因型分布差异有统计学意义(P<0.05),两组ε3基因携带者和ε4基因携带者占比有明显差异(P<0.05)。单因素Logistic回归分析提示,仅携带ε4为颅脑损伤后认知功能障的危险因素[P=0.005,OR=0.317(95%CI:0.142~0.711)]。把单因素Logistic回归中P值最低的5个变量(GCS、性别、损伤程度及ε3、ε4携带者)所有因素纳入多因素Logistic回归分析,发现携带ε4基因是颅脑损伤后认知功能障的危险因素[P=0.039,OR=0.379(95%CI:0.150~0.954)]。结论ApoEε4基因与颅脑损伤后认知功能障碍有关。

溶血素 E基因原核表达载体的构建与蛋白诱导表达

目的构建大肠杆菌(Escherichia Coli,E.coli)溶血素E(Hemolysin E)基因的重组质粒pCZN1-hlyE,诱导表达目的蛋白。方法通过NCBI数据库检索获取E.coli Hemolysin E基因序列(NC_000913.3),采用基于PAS(PCR-based Accurate Synthesis)的全基因合成法,设计全长拼接引物,合成目的基因,并成功构建重组质粒pCZN1-hlyE。将构建好的pCZN1-hlyE重组质粒转入大肠杆菌TOP10菌株中,并用异丙基-β-D-硫代半乳糖苷(IPTG)诱导Hemolysin E基因的表达,生成Hemolysin E毒力蛋白。结果经SDS-PAGE凝胶电泳,Western blot分析鉴定目的蛋白Hemolysin E分子量为28.72 kDa,与Hemolysin E基因核酸序列经DNAMAN软件分析所得蛋白分子量一致。结论被诱导表达的Hemolysin E蛋白存在于菌体裂解液上清中,并纯化制备重组蛋白。

Effect of apolipoprotein E gene Hha Ⅰ restricting fragment length polymorphism on serum lipids in cholecystolithiasis

AIM To investigate the role of apolipoprotein E (apoE) polymorphism in the lithogenesis of gallstone and the hereditary pathogenesis of the disease.METHODS Polymerase chain reaction (PCR)was used to study apoE phenotypes and allelefrequencies in patients with gallstones and control, and the fasting serum lipids of subjectswere also measured by enzymatic methods.RESULTS The levels of triglyceride (TG) andvery low density lipoprotein cholesterol (VLDLC) were much higher in Ez/, patients than that inE,/, control. E,/, patients were accompanied withremarkably low levels of high density lipoproteincholesterol (HDLC) and its subforms. But in E,/#patients there were only slight changes in levelsof VLDLC and low density lipoprotein cholesterol (LDL--C).CONCLUSION Different apoE phenotype patientswith gallstones have different cheracteristics ofdyslipidemia and the average level of serum lipids in patients with gallstones are higher thansubjects without gallstones in the same apoEgene phenotype. EZ allele is possibly one of thedangerous factors in the lithogenesis of cholecystolithiasis.

Effects of HPV Pseudotype Virus in Cutting E6 Gene Selectively in SiHa Cells

The objectives of this study were to investigate the effects of the CRISPR/Cas9 system mediated by the HPV pseudotype virus on SiHa cytobiology behavior by cutting the HPV16 E6 gene selectively and to explore the role of this system in the treatment of cervical cancer. After designing specific gRNA sequences targeting HPV 16 E6, generating hCas9-EGFP and E6-gRNA-RFP plasmids, and preparing the pseudovirus of HPV16 carrying E6-gRNA and Cas9 plasmids, we determined the titer of the pseudotype virus using the TCID50 method. We obtained the pseudotype virus of HPV16 carrying E6-gRNA and Cas9 plasmids to transfect cervical cancer SiHa cells. Experimental subjects were divided into control group, empty virus group, E6-gRNA transfected group, Cas9 transfected group and Cas9＋E6-gRNA transfected group. The molecular size of the cutting sequence was detected using the T7E1 enzyme digestion method and agarose gel electrophoresis, and the cleavage function of CRISPR/Cas9 on the E6 gene was determined at the same time. RT-PCR and Western blotting were performed to detect the mRNA and protein expression levels of E6 in all the groups; the Transwell cell migration assay was performed to detect the cell migration ability and metastasis in all groups. Heterotopic transplantation tumors were incorporated into mice and were used to investigate the effects of the CRISPR/Cas9 system mediated by the HPV pseudovirus on the tumorigenic ability of SiHa cells by selectively cutting HPV16 E6. The HPV16 pseudotype virus carrying E6-gRNA and Cas9 plasmids could successfully infect SiHa cells, and there were two cutting zones in the Cas9＋E6- gRNA transfected group. However, the empty virus group, E6-gRNA transfected group and Cas9 transfected group had no corresponding zone. Compared with those in the control group, the empty virus group, E6-gRNA transfected group and Cas9 transfected group, the mRNA and protein expression levels of E6 in SiHa cells were downregulated in the Cas9＋E6-gRNA transfected group （P〈0.01）. In addition, the proliferation and migration abilities of SiHa cells were significantly inhibited （P〈0.01）. There were no significant differences among the other groups. In contrast to the control group, the HPV pseudotype virus carrying E6-gRNA and Cas9 plasmids could significantly delay the growth of tumor cells of the ectopic tumor transplantation model （P〈0.01）. The CRISPR/Cas9 system mediated by the HPV pseudotype virus to knockout E6 gene expression exhibited a clear inhibitory effect on the biological function of SiHa cells, which indicated that knocking out the E6 gene using the CRISPR/Cas9 system mediated by the HPV pseudotype virus had a potential effect of eliminating HPV infection and inhibiting the growth of HPV-related tumors. Taken together, these findings provide insight into a new treatment strategy for the prevention and treatment of hr-HPV infected disease, particularly in HPV-related tumors.

Correlation of E-selectin gene polymorphisms with risk of ischemic stroke A meta-analysis

OBJECTIVE： To investigate the association of E-selectin $128R polymorphisms with ischemic stroke. DATA SOURCES： A computer-based online search was conducted in PubMed, Elsevier, Ovid Database, the China National Knowledge Infrastructure, and Wanfang Database between January 1998 and December 2010. STUDY SELECTION： Case-controlled studies addressing the association of the E-selectin polymorphism and ischemic stroke were included in this review. The genotype distribution complied with the Hardy-Weinberg genetic equilibrium. The included reports were evaluated by two authors for strict quality screening. Meta-analysis software, REVMAN 5.1, was used to investigate heterogeneity, pooled odds ratio （OR） and 95% confidence interval （CO in individual studies. MAIN OUTCOME MEASURES： Genotype and allele distributions at the E-selectin $128R site. RESULTS： Six case-controlled studies were included after screening and application of inclusion and exclusion criteria. There was no heterogeneity in the genotype and allele frequencies, and no publication bias was found. Meta-analysis of the pooled data showed that the OR value of the （AC＋CC）/AA genotype was 1.93 （95% CI： 1.55 2.41, Z= 5.80, P 〈 0.000 01）, and the ORfor the C/A allele was 1.80 （95% CI： 1.47 2.22, Z= 5.59, P 〈 0.000 01） in the ischemic stroke group, compared with control group. Results of pooled data in Chinese subjects showed that the ORvalue of （AC＋CC）/AA was 2.36 （95% CI： 1.68 3.31, Z = 4.99, P 〈 0.000 01）, and the OR value of the C/A allele was 2.25 （95% CI： 1.63 3.12, Z= 4.89, P 〈 0.000 01）. CONCLUSION： Polymorphism of E-selectin S128R was significantly associated with susceptibility to ischemic stroke; the AC and CC genotypes as well as the C allele may be factors associated with susceptibility to ischemic stroke.

Human Papillomavirus 16E6 Oncogene Mutation in Cervical Cancer

Objective： Cervical cancer （CC） is the second most common type of cancer in women worldwide, after breast cancer. High-risk human papillomaviruses （HR-HPVs） are considered to be the major causes of cervical cancer. HPV16 is the most common type of HR-HPVs and HPV16 E6 gene is one of the major oncogenes. Specific mutations are considered as dangerous factors causing CC. This study was designed to find mutations of HPV16 E6 and the relationship between the mutations and the happening of CC. Methods： The tissue DNA was extracted from 15 biopsies of CC. Part of HPV16 E6 gene （nucleotide 201-523） was amplified by polymerase chain reaction （PCR） from the CC tissue DNA. The PCR fragments were sequenced and analyzed. Results： The result of PCR showed that the positive rate of HPV16 E6 was 93.33% （14/13）. After sequencing ana analyzing, in the 13 out of 14 PCR fragments, 4 maintained prototype （30.77%）, 8 had a same 350G mutation （61.54%）, and 1 had a 249G mutation （7.69%）. Conclusion： This study suggest that there is a high infection rate of HPV in cervical cancer and most of the HPV16 E6 gene has mutations. Those mutations may have an association with the development of cervical cancer.

Association of Apolipoprotein E Gene Polymorphism with Lipid Profile in Patients with Acute Coronary Syndrome in Han Chinese: A Critical Review

This review paper focuses on the genetic contribution, in particular, the association of Apolipoprotein E gene polymorphism to lipid abnormality and subsequent acute coronary syndrome in Han Chinese of China. Many researches have been published pertaining the influence of ApoE gene polymorphism on coronary artery disease, dyslipidemia and the response of statin in Han Chinese. Most of the studies in Han Chinese like other populations demonstrated that ApoE 4 allele genetically predisposes coronary artery disease, acute coronary syndrome, severity of occlusion of coronary artery and higher incidence of major adverse cardiovascular events (In Han Chinese, ApoE allele carriers demonstrated 85% increase in major adverse cardiovascular events (MACE) in six months follow up). In addition, ApoE4 allele carrier also showed both increased in LDL level and decrease response to statin therapy in dyslipidemic Han Chinese. On the other hand, ApoE2 carrier is scavenger of cholesterol and triglyceride from the blood;?thus it is cardiovascular-protective. Despite positive relationship between ApoE gene polymorphism and cardiovascular pathologies, prognostic outcome and resistance to intervention, this area of research still requires?extensive investigation in Han Chinese. Because, several other studies revealed either negative effect or showed no effect by ApoE gene polymorphism on cardiovascular disease. Some of the causes of such debatable results could be explained by factors such as diminutive frequency allele and expression of ApoE gene in coronary heart disease. This part of the research yet requires extensive study with bulkier sample size and retrospective in nature, in order to ascertain the influence of ApoE genotype on lipid, anti-hyperlipidemic agent and coronary heart disease. Such studies could assist us to confirm whether to test healthier subjects to predict genetic risk of coronary heart disease in Han Chinese population. The aim of this review paper is to critically analyze the effect of ApoE gene on the occurrence of coronary heart disease in Han Chinese.

Expression of Major Antigen Domains of E2 Gene of CSFV and Analysis of its Immunological Activity

E2 is an envelope glycoprotein of Classical swine fever virus (CSFV) and contains sequential neutralizing epitopes to induce virus-neutralizing antibodies and mount protective immunity in the natural host. In this study, four antigen domains (ABCD) of the E2 gene was cloned from CSFV Shimen strain into the retroviral vector pBABE puro and expressed in eukaryotic cell (PK15) by an retroviral gene expression system, and the activity of recombinant E2 protein to induce immune responses was evaluated in rabbits. The results indicated that recombinant E2 protein can be recognized by fluorescence antibodies of CSFV and CSFV positive serum (Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China) using Western blot, indirect immunofluorescence antibody test (IFAT) and ELISA, Furthermore, anti-CSFV specific antibodies and lymphocyte proliferation were elicited and increased by recombinant protein after vaccination. In the challenge test, all of rabbits vaccinated with recombinant protein and Chinese vaccine strain (C-strain) were fully protected from a rabbit spleen virus challenge. These results indicated that a retroviral-based epitope-vaccine carrying the major antigen domains of E2 is able to induce high level of epitope-specific antibodies and exhibits similar protective capability with that induced by the C-strain, and encourages further work towards the development of a vaccine against CSFV infection.

Apolipoprotein E gene polymorphism in cerebrovascular diseases of the Chinese Naxi populations from Yunnan province

Currently it is not well known whether apolipoprotein E （ApoE） is a genetic susceptibility factor for cerebrovascular diseases in the Chinese Naxi population. The present study detected and sequenced ApoE polymorphisms of 90 patients with cerebrovascular diseases （58 cases of cerebral infarction and 32 cases of intracerebral hemorrhage）, and 50 normal people of Naxi nationality from Yunnan province, China. The populations were used to analyze the relationship of ApoE polymorphisms with cerebral infarction and intracerebral hemorrhage. Results showed an association between ApoE gene polymorphism and the onset of cerebral infarction, and a possibility that the ε4 allele is a susceptibility locus for the risk of cerebral infarction. However, there was no evidence of a relationship between the ApoE gene polymorphism and cerebral hemorrhage.

The Detection of Pathogenic Porcine E.coli Virulence Gene (astA,stb)

[ Objective] This paper aimed to find out the relationship between pathogenic procine E. coli virulence gene and pathogenicity, and ex- plore the pathogenic mechanism of E. coil [ Methed] The detection of two E. coil virulence genes was performed. PCR method was taken to test the virulence genes, astA and stb, from 39 strains of typical serotype O porcine E. coli which had been separated and identified. [ Result] It＇s found that of the 39 isolates of porcine E. coli, 22 carried virulence gene astA which represented 56.41%, and 27 carried virulence gene stb which repre- sented 69.23%. [ Conclusion] This study has provided scientific data for future E. coil pathogenicity researches.

Apolipoprotein E gene polymorphism and susceptibility to intracerebral hemorrhage:A meta-analysis

OBJECTIVE： To evaluate the relationship between apolipoprotein E （ApoE） gene polymorphism and susceptibility to intracerebral hemorrhage （ICH） in Chinese population by a meta-analysis. METHODS： Related literature regarding control analysis between ICH and control groups was collected. Independent case-control studies published between 1989 and 2007 that had complete data were included; and articles not closely related to the topic were excluded. The meta-analysis software, RevMan 4.2, was applied to analyze the odds ratio （OR） value in those studies included in the analysis to assess the relationship between susceptibility to ICH and ApoE polymorphism. RESULTS： Eight papers which were in accordance with the inclusion criteria were selected, and a total of 1 249 ICH cases and 1 329 controls were involved. Meta-analysis results showed that with the wildtype E3/3 as a reference, the OR values （95% confidence interval） of intracerebral hemorrhage for subjects carrying E2/2, E3/2, E4/2, E4/3, and E4/4 were 1.15 （0.60–2.21）, 1.00 （0.79–1.28）, 3.01 （1.73–5.23）, 1.78 （1.41–2.24） and 1.94 （1.03–3.65）, respectively. The combined OR values （95% confidence interval） of intracerebral hemorrhage for ε4 and ε2 carriers were 1.53 （1.16–2.01）, and 0.93 （0.69–1.25）. CONCLUSION： The results suggest that ApoE polymorphism is significantly associated with susceptibility to intracerebral hemorrhage and that ε4 carriers have a higher risk for intracerebral hemorrhage than others.

APOE多态性在炎症因子诱导的神经毒性反应性星形胶质细胞中的差异作用

目的:探讨载脂蛋白E(APOE)基因多态性在神经毒性反应性星形胶质细胞中的差异作用,为阿尔茨海默病(AD)发病机制的研究提供理论依据。方法:体外分离培养APOE基因敲除小鼠(APOE^(-/-))原代皮层星形胶质细胞,免疫荧光染色法鉴定细胞纯度。构建人APOE3和APOE4重组过表达质粒,分别转染至原代APOE^(-/-)星形胶质细胞中,以APOE^(-/-)原代细胞为对照,采用Western blotting法检测细胞中APOE和神经胶质酸性蛋白(GFAP)蛋白表达水平,采用酶联免疫吸附试验(ELISA)法检测细胞培养上清中APOE水平。采用白细胞介素1α(IL-1α)、肿瘤坏死因子(TNF)和补体C1q联合刺激转染APOE3和转染APOE4的原代星形胶质细胞制备炎症模型,分为APOE3+PBS组、APOE4+PBS组、APOE3+IL-1α+TNF+CC1q组和APOE4+IL-1α+TNF+C1q组,采用细胞免疫荧光染色法观察各组细胞形态表现,采用实时荧光定量PCR(RT-qPCR)法检测各组细胞中磷脂酰肌醇蛋白聚糖4(Gpc4)、磷脂酰肌醇蛋白聚糖6(Gpc6)、血小板反应蛋白1(Thbs1)、血小板反应蛋白2(Thbs2)、酸性分泌蛋白类似蛋白1(Sparcl1)、胶质细胞源性神经营养因子(GDNF)、C3和S100钙结合蛋白B(S100B)mRNA表达水平,微球吞噬实验检测各组细胞吞噬能力,Western blotting法检测各组细胞中B细胞淋巴瘤2(Bcl-2)和含半胱氨酸的天冬氨酸蛋白水解酶3(Caspase-3)蛋白表达水平。结果:与APOE^(-/-)组比较,转染APOE3和APOE4组细胞中APOE和GFAP蛋白表达水平及细胞培养上清中APOE水平明显升高(P<0.01)。荧光显微镜下观察,分别与APOE3+PBS组和APOE4+PBS组比较,APOE3+IL-1α+TNF+Cq1组和APOE4+IL-1α+TNF+Cq1组星形胶质细胞突起变短,胞体变大;与APOE3+IL-1α+TNF+Cq1组比较,APOE4+IL-1α+TNF+Cq1组星形胶质细胞突起更短。分别与APOE3+PBS组和APOE4+PBS组比较,APOE3+IL-1α+TNF+Cq1组和APOE4+IL-1α+TNF+Cq1组细胞中Gpc4、Gpc6、Thbs1、Thbs2和Sparcl1 mRNA表达水平明显降低(P<0.01);与APOE3+IL-1α+TNF+Cq1组比较,APOE4+IL-1α+TNF+Cq1组细胞中Gpc4、Gpc6、Thbs1、Thbs2和Sparcl1 mRNA表达水平明显降低(P<0.05或P<0.01)。分别与APOE3+PBS组和APOE4+PBS组比较,APOE3+IL-1α+TNF+Cq1组和APOE4+IL-1α+TNF+Cq1组细胞中GDNF mRNA表达水平明显降低(P<0.01),C3和S100B mRNA表达水平明显升高(P<0.01);与APOE3+IL-1α+TNF+Cq1组比较,APOE4+IL-1α+TNF+Cq1组细胞中GDNFmRNA表达水平明显降低(P<0.05),C3和S100B mRNA表达水平明显升高(P<0.05)。分别与APOE3+PBS组和APOE4+PBS组比较,APOE3+IL-1α+TNF+Cq1组和APOE4+IL-1α+TNF+Cq1组细胞吞噬微珠数量明显减少;与APOE3+IL-1α+TNF+Cq1组比较,APOE4+IL-1α+TNF+Cq1组细胞吞噬微珠数量明显减少。分别与APOE3+PBS组和APOE4+PBS组比较,APOE3+IL-1α+TNF+Cq1组和APOE4+IL-1α+TNF+Cq1组细胞中Bcl-2蛋白表达水平明显降低(P<0.05或P<0.01),Caspase-3蛋白表达水平明显升高(P<0.01);与APOE3+IL-1α+TNF+Cq1组比较,APOE4+IL-1α+TNF+Cq1组细胞中Bcl-2蛋白表达水平明显降低(P<0.01),Caspase-3蛋白表达水平明显升高(P<0.05)。结论:APOE4基因型比APOE3诱导炎症因子能力更强,可诱导神经毒性反应性星形胶质细胞表型,增加神经毒性,影响星形胶质细胞凋亡,从而加剧神经元损伤。

Cloning and sequence analysis of E2 gene of bovine viral diarrhea virus HB-DCZ strain in Hebei province of China

The objective of this paper was to analyze the E2 genetic characterization of HB-DCZ strain of Bovine viral diaxrhca Virus （BVDV） which wcrc amplified by RT-PCR and isolated from China. The product of PCK was cloned into pMD18-T vector, and then transfected Escherichia Coli JMI00. The recombinant plasmids were amplified by PCR and were sequenced. From the nucleotide sequence of the amplified products, phylogenetie analyses were performed and genotypes or subgenotypes were identified. The results indicated that the E2 gene fragment of HB-DCZ strain contained 1277bp nucleotides, and had 89.4%, 70.7%, 97.6%, 68.9%, 67.2% sequence similarity with Osloss, OregonC24V, Changchun184, ZM195, NADL, respectively. In conclusion, HB-DCZ strain is closely related to BVDV Osloss, Changchun184, and belongs to subgenotype lb.

Cloning and Sequence Analysis of E Gene from Chicken Flavivirus Isolate CJD05

[ Objective] This experiment aimed to find out the origin and genetic evolution relationship of chicken flavivirus （CFV） CJD05 strain in Fujian Province. [Method] A pair of primers were designed and synthesized according to the sequences of E gene from Duck flavivirus （DFV） iso- late BYD-1. E gene of CFV isolate CJD05 was specially amplified and its sequences were analyzed. [Result] The target bar which was cloned from CFV isolate C, JD05 was I 503 bp. Homology analysis was conducted to compare E gene nucleotide sequence of CFV isolate CJD05 with DFV iso- late BYD-I and goose flavivirus （GFV） isolate JS804. Results indicated that isolate nuclectide homologies were 99.2% and 99.3%, and amino acid homologies were 99.0% and 98.6% respectively. [Conclusion] CFV isolate C, JD05, DFV isolate BYD-1 and GFV isolate JS804 were highly homologous. The homology of CFV isolate CJD05 with Tembusu virus （TMUV） was higher than with other arthropod-borne flaviviruses.

Association of apolipoprotein E gene polymorphism with the occurrence and therapeutic effect of ischemic stroke

At present,ischemic stroke seriously affects people's life and health,and its occurrence,development and therapeutic effect are affected by many factors.With the deep research on ischemic cerebral apoplexy disease,people have a deeper understanding of its virulence genes.The apolipoprotein E genotype is the research focus recently,its genetic type is not only involved in the occurrence and development of ischemic cerebral apoplexy,but also causes different therapeatic effects.In this paper,we reviewed the relationship between apolipoprotein E gene polymorphism and lipid metabolism and atherosclerosis in ischemic stroke,as well as the differences in the therapeutic effects of thrombolysis,thrombectomy and lipid-lowering among different genotypes.

Lack of association between cellular repressor of E1A-stimulated genes(GREG)polymorphisms and coronary artery disease in the Han population of North China

Objectives Phenotypic switching of smooth muscle cells(SMCs) plays a critical role in the pathogenesis of atherosclerotic lesions such as coronary artery disease (CAD).Accumulating evidence demonstrates(hat a cellular repressor of E1A-stimulated genes(CREG) plays a role in the maintenance of the mature phenotype of vascular SMCs. The purpose of the present study was to assess the possible association between CREG and CAD in the Han population of North China.Methods The promoter region of CREG by direct sequencing was conducted in 48 subjects.Then SNP rs2995073 and another 4 tagSNPs(rs4657669,rs3767443, rsl6859185,rs3753921) were selected for the association study.All five selected SNPs were determined in 1161 patients with angiographically proven CAD and 960 controls with normal coronary angiograms to investigate the possible involvement of CREG in CAD.Results Genotype frequencies of the five examined polymorphisms were similarly distributed between CAD group and controls(P】0.05).Further haplotype analysis also found no significant differences in the distributions between CAD group and controls(P】0.05). Conclusions This study did not show an association between common variants of CREG and CAD in the northern Chinese Han population.

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.

Study on relationship of apolipoprotein E gene polymorphism and genetic susceptibility of stress urinary incontinence

Objective:To explore the relationship between apolipoprotein E(ApoE) gene polymorphism and susceptibility of stress urinary incontinence(SUI). Methods:ApoE genotypes were examined by polymerase chain reaction-restricted fragment length polymorphism (PCR-RFLP) technique in 99 patients with SUI and 101 asymptomatic controls. Results:The frequency of allele e3 of ApoE was slightly lower in patients with anatomic SUI than that in controls (79.44%vs.81.68%),while the frequency of allele e4 of ApoE was slightly higher in patients with anatomic SUI than that in controls(10.00%vs.9.90%).No significant difference was found in frequency of allele e3 or e4 between SUI patients and controls(x^2=0.523,P = 0.770). Conclusion:The gene polymorphism of ApoE is not independently involved in the development of SUI.