CCR5基因5′侧翼区的克隆及调控功能初步研究

目的 :研究CCR5基因 5′侧翼区的调控序列。方法 :分段构建CCR5基因 5′侧翼区的pCAT报告基因载体 ;分析各片段在Hela细胞中的CAT调节活性。结果 :CCR5基因 5′侧翼区基因 - 1～ - 4 86bp序列的pCAT重组质粒在Hela细胞中能明显表现CAT上调活性 ,其活性比pCATenhancervector的活性高 3倍。结论 :CCR5基因 5′侧翼区基因 - 1～ - 4 86bp序列中存在基因转录上调元件     

EOLA1基因5′侧翼区的克隆及调控功能初步研究

目的研究内皮细胞高表达脂多糖相关因子1(endothelial overexpressedlipopolysaccharide associatedfactor1,EOLA1)基因5′侧翼区的调控序列。方法通过基因组步移克隆EOLA1基因5′侧翼区不同长度的片段,插入β半乳糖苷酶(βgal)报告基因载体,分析各片段在ECV304细胞中的βgal调节活性。结果含EOLA1基因5′侧翼区-1～-2659bp和-1～-1951bp序列的重组质粒在ECV304细胞中能明显表现βgal上调活性,而-1～-361bp序列的重组质粒活性无明显变化。结论EOLA1基因5′侧翼区-361～-1951bp内存在基因转录启动子元件。     

人CCR5 5′侧翼调控序列克隆测定及基序分析

目的：克隆人ＣＣＲ５ ５′侧翼调控序列及其基序分析。方法：设计单引物,利用单向多循环ＰＣＲ扩增及聚丙烯酰胺凝胶电泳纯化人ＣＣＲ５ ５′侧翼调控序列基因组ＤＮＡ,ＰＣＲ产物作为序列分析模板。结果：得到长为１．５ｋｂ的人ＣＣＲ５ ５′侧翼调控序列基因组ＤＮＡ序列,并对该区域的基序进行了分析。结论：该方法适合于基因组ＤＮＡ,特别是逆向扩增一些读框区５′侧翼调控序列。     

EOLA1基因5'侧翼区的克隆及调控功能初步研究

目的研究内皮细胞高表达脂多糖相关因子1(endothelial-overexpressed lipopolysaccharide-associated factor 1,EOLA1)基因5'侧翼区的调控序列.方法通过基因组步移克隆EOLA1基因5'侧翼区不同长度的片段,插入β-半乳糖苷酶(β-gal)报告基因载体,分析各片段在ECV304细胞中的β-gal调节活性.结果含EOLA1基因5'侧翼区-1～-2 659 bp和-1～-1 951 bp序列的重组质粒在ECV304细胞中能明显表现β-gal上调活性,而-1～-361 bp序列的重组质粒活性无明显变化.结论 EOLA1基因5'侧翼区-361～-1 951 bp内存在基因转录启动子元件.     

小鼠β趋化因子受体CCR5基因的克隆

目的：克隆小鼠β趋化因子相关的受体并研究其表达。方法：使用共同引物用ＲＴ－ＰＣＲ方法，从ＢＡＬＢ／ｃ小鼠腹腔巨噬细胞的Ｐｏｌｙ（Ａ）＾＋ＲＮＡ中扩增出一０．５ｋｂ ｃＤＮＡ，再根据其序列，设计一特异引物，用Ｍａｒａｔｈｏｎ ＰＣＲ法扩增得一２．８ｋｂ ｃＤＮＡ，用Ｓｏｕｔｈｅｍ方法检测分析该ＡＤＬＤ，Ｎｒｔｈｅｒｎ方法分析其表达。结果：成功克隆出小鼠ＣＣＲ５ ｃＤＮＡ，其开放阅读框为１０６５ｂｐ，     

SRY基因启动子不同模块的克隆及功能分析

采用报告基因分析的方法，构建ＳＲＹ基因５’旁侧具有启动效应的５４４ｂｐ以内不同长度片段与荧光素酶报告基因载体ＰＧＬ２－Ｅｎｈａｎｃｅｒ的重组子，并通过脂质体转染技术导入Ｈｅｌａ细胞，检测各重组子报告基因的瞬间表达，由此分析启动子不同模块对基因转录效率的影响。     

CCR2和CCR5基因多态性与结核性脓胸的关系

目的探讨CCR2基因-190 G/A和CCR5基因-59029 G/A单核苷酸多态性(SNP)与结核性脓胸的关系。方法采用聚合酶链反应-限制性片段长度多态性(PCR-RFLP)方法对结核性脓胸患者300例和健康对照组300例进行CCR2基因-190 G/A和CCR5基因-59029 G/A SNPs检测。结果与CCR2基因-190 GG基因型相比,携带AG和AA基因型均可增加结核性脓胸发病风险(OR=2.254,95%CI 1.043~4.868;OR=8.728,95%CI 4.224~18.033)。进行分层分析发现,无卡介苗(BCG)接种史、体质量指数(BMI)<18.5 kg/m~2均增加结核性脓胸发病风险(OR=3.309,95%CI 2.108~4.382;OR=2.767,95%CI 1.918~3.993)。CCR5基因-59029 G/A各基因型未入选回归方程,无统计学意义(P>0.05)。结论CCR2基因-190 G/A SNP可能与结核性脓胸的发病风险有关;CCR5基因-59029 G/A SNP可能与结核性脓胸无关。     

LRP16基因启动子的亚克隆及表达调控载体的构建

目的：为深入研究LRP16基因的表达调控机制，克隆及亚克隆了LRP16基因的启动子序列，构建LRP16基因启动子表达调控载体。方法：在NCBI的人类基因组数据库中截取并下载LRPl6基因转录起始位点5′侧翼区约3kb的基因组序列设计PCR扩增引物，从健康外周血中扩增获得该片段，以此序列为基础进行亚克隆，分别获得6条5’端不等、3’端平齐的片段，最后插入用于表达调控研究的pGL3—Basic载体。结果：获得了7条长度依次差别约为400bp的LRP16启动子克隆，分别构建了调控荧光素两报告基因的真核表达载体。结论：上述载体的成功构建为信息资源与实验手段的有效结合克隆启动子序列提出了一种模式，并为LRPl6表达克隆及启动子的活性分析奠定了基础。     

CCR5基因多态性的研究进展

获得性免疫缺陷综合征（acquired immunodeficiency syndrome，AIDS）自1981年在美国首次被发现以来，迅速在世界范围内蔓延，成为危害人类健康最为严重的传染病之一。人类免疫缺陷病毒（human immunodeficiency virus，HIV）是AIDS的病原体。HIV属逆转录病毒科（Retroviridae）慢病毒属（Lentivirus）灵长类慢病毒群（Primaite Lentivirusgroup），有外膜的单股、双基因组RNA病毒。根据病毒的抗原性和基因结构的差异，可将其分为Ⅰ型（HIV-1）和Ⅱ型（HIV-2）。HIV-Ⅰ、HIV-2型的形态完全相同，但两者核苷酸序列相差超过40％。且前，HIV-1在世界范围内流行，HIV-2虽然在全球有散在的病例报道，但主要局限于非洲的少数几个国家，因此，世界各国投入了大量的人力、物力对HIV-1病毒进行研究并取得重大讲展。     

广西罗城仫佬族人群HIV-1感染相关基因CCR5多态性的初步研究

目的:了解广西仫佬人群中HIV辅助受体CCR5△32和CCR5-894C缺失等位基因突变频率和多态性的特点,为评估该民族人群对HIV的遗传易感性和艾滋病的防治提供理论依据。方法:以197例仫佬族为研究对象,应用PCR和DNA测序等方法检测CCR5△32和CCR5-894C缺失突变体。结果:未发现CCR5△32和CCR5-894C缺失突变体。结论:由于未发现CCR5△32和CCR5-894C缺失突变体,推测仫佬族人群对HIV-1病毒感染可能具有较大的遗传易感性。     

人趋化因子受体5基因5'侧翼区功能分析

目的：分析人趋化因子受体5（CCR5）基因5’侧翼区的调控序列。方法：构建CCR5基因不同长度5’侧翼区的萤光素酶报告基因载体,分别转染人Jurkat细胞中,检测分析其萤光素酶活性。结果：CCR5基因5’侧翼区-1006bp至-1bp、-804bp至-1bp、-586bp至-1bp和-478bp至-1bp区段的pGL3重组质粒在Jurkat细胞中能表现出明显的萤光素酶活性。结论：CCR5基因5’侧翼区-478bp至-1bp序列中存在基因转录的主要上调元件。     

PLASMA RESISTIN LEVELS AND SINGLE-NUCLEOTIDE POLYMORPHISMS IN RESISTIN GENE 5＇ FLANKING REGION IN PATIENTS WITH STROKE

OBJECTIVE: To analyze the role of resistin in insulin resistance (IR) through investigating the variation of plasma resistin levels and single-nucleotide polymorphisms (SNPs) in resistin gene 5' flanking region in stroke patients. METHODS: In 103 atherothrombotic cerebral infarction (ACI) patients, 85 lacunar infarction (LI) patients, 70 intracerebral hemorrhage (ICH) patients, and 86 healthy controls, plasma resistin and insulin levels were measured by ELISA, SNPs in resistin gene 5' flanking region were detected by PCR and direct DNA sequencing. The subjects' body height and weight, the body mass index, quantitative insulin sensitivity check index (QUICKI), blood pressure, and the concentration of fasting plasma glucose, triglyceride, total cholesterol, creatinine, low-density lipoprotein, and high-density lipoprotein were also determined. RESULTS: QUICKI was significantly lower in the ACI and ICH patients (0.316 +/- 0.037 and 0.309 +/- 0.032, respectively) than that in the controls (0.342 +/- 0.043, P < 0.001), while plasma resistin level was significantly higher in the ACI and ICH patients (6.36 +/- 3.79 and 7.15 +/- 4.27 ng/mL, respectively) than that in the controls (5.28 +/- 2.56 ng/mL, P < 0.05), but such difference was not observed in the LI patients compared with controls. There was a statistically negative correlation between plasma resistin level with QUICKI (r = -0.228, P < 0.001). The distributions of allele and genotype frequencies of resistin gene - 420C > G and - 537A > C SNPs were not significantly different among the different groups, and those SNPs were not correlated with other clinical and biochemical parameters. CONCLUSIONS: Plasma resistin is associated with stroke by participating in the development of IR. The SNPs in resistin gene 5' flanking region has no impact on the plasma resistin level.     

内含子和5′非翻译区对人血小板生成素基因表达的影响

OBJECTIVE: To study the role of 5' untranslated region (UTR) and intron in the expression of human thrombopoietin (TPO) gene. METHODS: A number of expression vectors containing TPO mini-gene fused to the regulatory elements of cytomegalovirus (CMV) were constructed and transfected via lipofectin into cultured cos-1 cells for transient expression of TPO gene. The cell culture media were analyzed with highly sensitive sandwich enzyme-linked immunosorbent assay (ELISA) 48 h after the transfection. RESULS: The expression levels of the TPO gene elements followed the order of TPO intron v> TPOcDNA> TPO intron I> TPO intron I> TPO gDNA in cos-1 cells. CONCLUSION: The last intron of TPO gene obviously enhances the expression level of TPO gene, which can be inhibited by 5'UTR of TPO gene.     

Structure and function of alleles in the 3' end region of human apoB gene

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Diabetic hypertriglyceridaemia and related 5' flanking polymorphism of the human insulin gene

A polymorphic DNA sequence was studied on the 5' flanking region of the human insulin gene in relation to diabetic lipaemia. The genotype frequencies in a control population (n = 52) were homozygous L 6%, heterozygous 54%, and homozygous S 40%. Corresponding genotype frequencies in a hypertriglyceridaemic group (n = 74) were 18%, 66%, and 16% (p less than 0.01; chi 2 test). When the hypertriglyceridaemic patients were divided on the basis of glucose tolerance the corresponding genotype frequencies in the diabetic subgroup (n = 23) were 39%, 52%, and 9% compared with 0%, 74%, and 26% in the non-diabetics (n = 34) (p less than 0.001; chi 2 test). These findings suggest that the homozygous L genotype may confer susceptibility to diabetic hypertriglyceridaemia.     

CCR5基因多态性与尖锐湿疣的关系

目的探讨CCR5△32基因多态性与尖锐湿疣的关系。方法收集60例尖锐湿疣患者和50例健康对照者的DNA标本,采用PCR方法扩增CCR5基因片段,比较两组的基因型差别。结果60例尖锐湿疣和50例健康对照者中均未发现突变型CCR5△32基因型。结论CCR5△32基因多态性与尖锐湿疣无相关性。     

汉族人AGT基因5′-调控区序列分析

目的 分析汉族人血管紧张素原（ａｎｇｉｏｔｅｎｓｉｏｎｇｅｎ,ＡＧＴ）基因５′－调控区多态笥与其与原发性高血压的关联。方法 应用ＰＣＲ产物单链构象的多态性分析（ＰＣＲ－ＳＳＣＰ）和ＰＣＲ直接测序方法,鉴定１００例高血压患者和５０例正常血压对照者的血管紧张素原基因５′－调控区－１５５至＋２５ｂｐ核酸序列。结果（１）汉族人ＡＧＴ基因５′－调控区－２０位是腺嘌呤核苷酸（Ａ）,而白种人该位是胞嘧啶核苷酸（