中国湖北地区人群白细胞介素-6基因-174G/C多态性分布特点

目的 :探讨湖北地区汉族人群白细胞介素 6基因启动子 -174位点多态性分布特点 ,比较其在不同种族间分布的差异。方法 :采用聚合酶链反应及限制性片断长度多态性方法 ,检测中国湖北地区人群白细胞介素 6基因启动子 -174位点多态性 ,并结合文献进行不同种族间的比较分析。结果 :中国湖北地区人群白细胞介素 6基因启动子-174位点各基因型频率GG型 98% ,GC型 2 % ,CC型 0 %。等位基因频率G为 99% ,C为 1%。与欧美国家人群相比 ,该位点多态性存在显著差异 (P <0 .0 1)。结论 :白细胞介素 6基因启动子 -174位点多态性有明显的种族差异。     

中国湖北地区汉族人群P-选择素基因-2123C/G多态性分布的研究

目的:探讨P-选择素(P-selectin)基因启动子-2123位点多态性在中国湖北地区汉族正常人群中的分布特点。方法:采用聚合酶链反应(PCR)及限制性片断长度多态性(RFLP)方法检测中国湖北地区170名汉族人群P-选择素基因启动子-2123位点多态性,探讨其基因型及等位基因分布特点。结果:中国湖北地区人群P-选择素基因启动子-2123位点各基因型频率CC型8.20%,CG型37.60%,GG型54.10%。等位基因频率C为27.10%,G为72.90%。与欧洲国家人群相比,该位点多态性存在显著差异(P<0.01)。结论:P-选择素基因启动子-2123位点多态性有明显的种族差异。     

P-选择素启动子区C-2123G、T-1817C基因多态性的研究

目的研究P-选择素(P-selectin)基因启动子区C-2123G、T-1817C多态性在中国湖北地区健康汉族人群中的分布,同时比较不同种族间基因型及等位基因频率分布差异.方法应用聚合酶链反应-限制性片段长度多态性(PCR-RFLP)的分析方法,检测200名健康者P-selectin基因启动子区C-2123G、T-1817C的基因型并计算其基因型频率及等位基因频率.结果中国湖北地区健康人群P-selectin C-2123G基因各基因型频率:CC型8.0%,CG型40.5%,GG型51.5%;C,G各等位基因频率分别为28.2%,71.8%,这种基因多态性分布在男女间无显著性差异(P＞0.05).与德国和英国比较,发现不同种族间P-selectin C-2123G基因型分布及等位基因频率均存在显著差异(P＜0.001,P＜0.001).P-selectin T-1817C基因各基因型频率:TT型65.5%,TC型28.5%,CC型6.0%;T,C各等位频率分别为79.75%,20.25%,这种基因多态性分布在男女间无显著性差异(P＞0.05).与英国比较,发现不同种族间P-selectin T-2123基因型分布及等位基因频率均存在显著差异(P＜0.001).结论中国湖北地区汉族人群中存在P-selectin启动子区C-2123G、T-1817C基因多态性,这种多态性在同种族男女间无差异,在各族间存在着较大的差异.     

湖北地区汉族健康人群白细胞介素-1α基因启动子-889C/T位点多态性的研究

目的 :了解湖北地区汉族健康人群白细胞介素 1α基因 (IL 1A )启动子 -889位点的单核苷酸多态性 (SNP) ,比较其在不同种族间的分布特点。方法 :采用聚合酶链反应 限制性片段长度多态性 (PCR RFLP)分析的方法 ,检测 184名健康者IL 1A启动子 -889位点的SNP ,分析其基因型和等位基因频率。结果 :CC、CT、TT三种基因型 ,以C等位基因发生频率最高 ( 92 .4% ) ,T等位基因次之 ( 7.6% ) ;与挪威人群比较 ,其基因型和等位基因频率均存在极显著性差异 (P <0 .0 0 1) ,而与日本人群相比也有显著差异 (P <0 .0 5)。结论 :IL 1A启动子 -889位点存在SNP ,其在不同种族间的分布存在明显的差异 ,这种差异有可能是导致一些疾病在不同种族间的发病率和临床表现显著不同的因素之一     

E-选择素基因第2外显子G98T单核苷酸多态性的调查

目的 :研究湖北地区汉族人群E 选择素 (E selectin)基因第 2外显子 98位点的单核苷酸多态性 (SNP) ,比较种族间单核苷酸的基因频率分布差异。方法 :应用聚合酶链反应 限制性片段长度多态性(PCR RFLP)的分析方法 ,检测了 2 40名健康者E selectin第 2外显子 98位点单核苷酸的基因型。结果 :E selectin各基因型频率GG型91.3 % ,GT型 8.7% ;G ,T各等位基因频率分别为 95 .6% ,4.4% ,这种基因多态性分布在男女间均无显著性差异 (P >0 .0 5 )。与其它种族比较 ,发现不同种族间E selectin基因型分布及等位基因频率均存在显著差异 (P <0 .0 5 )。结论 :在湖北地区汉族人群中存在E se lectin基因第 2外显子 98位点的单核苷酸多态性 ,这种多态性在种族间可能存在着较大的差异     

TGF-β1多态性与张家口汉族桥本甲状腺炎的相关性研究

目的 研究TGF-β1基因启动子区-988、-800、-509位点的多态性与桥本甲状腺炎易感性的相关性.方法 选取2014至2015年,张家口地区汉族人群的桥本甲状腺炎患者和健康体检人群对照组各200例,提取外周血DNA进行PCR测序,检测TGF-β1基因-988、-800、-509位点,观察这三个位点基因型频率、等位基因频率;结果 基因-988、-800位点均只有一个基因型,分别为C/C、G/G,不具基因位点多态性.启动子区-509位点出现三种基因型,分别为C/C(55.0%),C/T(33.0%),T/T(13.0%),疾病组和对照组各基因型分布频率的差异有统计学意义,C/C基因型、C/T基因型、T/T基因型的卡方值分别是55.916(P<0.05)、57.853(P<0.05)、0.393(P>0.05);其中C/C基因型的OR值为5.277,C/T基因型OR值为0.201.结论 TGF-β1基因-509位点多态性与桥本甲状腺炎易感性相关,其C/C基因型、C等位基因可能为危险因素,C/T基因型、T等位基因可能为保护因素.     

白细胞介素10基因启动子区多态性与乙型肝炎病毒感染预后的关联研究

目的探讨中国汉族人白细胞介素10基因(interleukin10gene,IL10)启动子区单核苷酸多态性与乙型肝炎病毒(hepatitisBvirus,HBV)感染、转归的关联。方法采用聚合酶链反应-限制性片段长度多态性分析方法,检测231例HBV感染者,165例HBV感染康复者和135名正常对照者IL10基因启动子-1082G/A、-819T/C、-592A/C位点基因型。结果IL10基因启动子-1082G/A、-819T/C、-592A/C位点基因型和等位基因在HBV感染组、HBV感染康复组和正常对照组之间的分布频率比较差异无统计学意义(P>0.05),在血清HBV-DNA<1×103拷贝/mL的HBV感染者组和HBV-DNA≥1×103拷贝/mL组之间的分布频率比较差异亦无统计学意义(P>0.05);但IL10基因启动子-819T/C和-592A/C位点基因型和等位基因在HBV无症状携带组和慢性乙型肝炎组之间的分布差异有统计学意义(P<0.05),-819T/C位点TT型和-592A/C位点AA型在慢性乙型肝炎组的频率明显较高。结论汉族人IL10基因启动子多态性可能与人群对HBV易感性及感染后的病毒血症水平无显著相关性;但IL10启动子-819T/C和-592A/C位点基因多态性与HBV感染后的肝脏炎症反应有关。     

汉族人白细胞介素-18基因启动子多态性与慢性乙型肝炎的相关性研究

目的 探讨中国汉族人白细胞介素-18（interleukin-18,IL-18）基因启动子单核苷酸多态性及其与慢性乙型肝炎易感性之间的关系。方法 应用序列特异性引物一聚合酶链反应技术，检测231例慢性乙型肝炎患者和300名正常人儿．馏基因启动子-607C/A、-137G／C单核苷酸多态性位点基因型。结果 正常对照组和慢性乙型肝炎组中，IL-18基因启动子-607C/A位点3种基因型频率分别为CC型：0．22（66／300）和0．27（62／231），CA型：0．53（160／300）和0．50（116／231），AA型：0．25（74／300）和0．23（53／231）；IL-18基因启动子-137G／C位点3种基因型频率分别为GG型：0．67（202／300）和0．79（182／231），GC型：0．30（90／300）和0．19（45／231），CC型：0．03（8／300）和0．02（4／231）。经Y0检验，慢性乙型肝炎组IL-18基因启动子-137GG分布频率显著高于正常对照组（X^2=8．55，P=0．003），而-607C／-137C和-607A／-137C单倍型频率显著低于正常对照组。进一步比较慢性乙型肝炎患者儿．馏基因启动子多态性与乙型肝炎病毒（hepatitis Bvirus，HBV）DNA复制的关系，发现高水平HBV—DNA组-607位点AA基因型分布频率明显低于低水平HBV—DNA组（Y2=6．03，P=0．014）。结论 汉族人慢性乙型肝炎与IL-18基因启动子-607C/A、-137G／C单核苷酸多态性相关，其中IL-18基因启动子-137位点C等位基因可能对机体HBV感染有保护作用，而启动子-607位点AA型对感染后HBV—DNA的复制可能有抑制作用。     

中国广西人群S100B基因rs1051169G/C和rs9984765T/C的多态性

目的探讨中国广西人群S100B基因rs1051169 G/C和rs9984765 T/C位点遗传多态性的分布特征,并比较其与不同种族和地区人群的分布差异。方法采用单碱基延伸技术(SBE-PCR)和DNA测序法对398例广西体检者的S100B基因rs1051169 G/C和rs9984765 T/C位点进行基因分型,统计学分析其基因多态性的分布特征,并与国际人类基因组单体型图计划(Hap Map)数据库公布的Hap Map-具有北欧和西欧血统的犹他州人群(CEU)、Hap Map-非洲尼日利亚伊巴丹的约鲁巴人(YRI)、Hap Map-日本东京人群(JPT)和Hap Map-中国北京汉族人群(HCB) 4个人群的单核苷酸多态性(SNP)分型数据进行比较。结果广西人群S100B基因rs1051169 G/C位点存在GG、CG和CC基因型,其频率分别为41. 2%、44. 7%和14. 1%,G和C等位基因频率分别为63. 6%和36. 4%。rs9984765 T/C位点存在TT、CT和CC基因型,其频率分别为47. 7%、44. 5%和7. 8%,T和C等位基因频率分别为70. 0%和30. 0%。rs1051169 G/C和rs9984765 T/C位点的基因型和等位基因的分布频率差异均无统计学意义(P0. 05)。rs1051169 G/C基因型和等位基因频率与Hap Map-CEU、Hap Map-YRI和Hap Map-JPT比较差异均有统计学意义(P0. 01),与Hap Map-HCB比较,等位基因频率差异有统计学意义(P0. 05),基因型频率差异无统计学意义(P0. 05)。rs9984765 T/C位点的基因型和等位基因频率与Hap Map-YRI、Hap Map-JPT和Hap Map-HCB比较差异均有统计学意义(P0. 05),与Hap Map-CEU比较差异无统计学意义(P 0. 05)。结论广西人群S100B基因rs1051169 G/C和rs9984765 T/C位点存在多态性,且其多态性与不同种族和地区人群比较存在差异。     

Interleukin-18基因启动子区单核苷酸多态性与肝细胞癌遗传易感性关系的研究

目的探讨白细胞介素18(IL-18)基因启动子区-607C/A(rs1946518)和-137G/C(rs187238)单核苷酸多态性(SNP)与肝细胞癌(肝癌)遗传易感性的关系。方法应用序列特异性引物-聚合酶链反应(PCR-SSP)技术,检测228例肝癌患者和300例健康对照者IL-18基因启动子-607C/A(rs1946518)、-137G/C(rs187238)单核苷酸多态性位点基因型,分析肝癌患者和对照组基因型频率和等位基因频率分布。结果肝癌组SNP位点rs187238 G等位基因的频率明显高于对照组(OR=1.1891,95%CI=1.0106-1.5633,P=0.026)。携带rs187238 GG基因型的肝癌患者较多(OR=1.5168,95%CI=1.1490-1.8322,P=0.010)。分层分析发现,rs1946518位点上AA基因型与肝癌发病的关联在饮酒的肝癌患者中更加显著(P=0.024),而且rs187238位点上GC/CC基因型与肝癌发病的关联在出现肝癌复发的患者中更加显著(P=0.005)。结论 IL-18基因启动子区-137G/C(rs187238)GG基因型与肝癌遗传易感性有关联。而rs1946518位点AA基因型和rs187238位点GC/CC基因型分别与肝癌患者饮酒和肝癌复发有关联。     

IL-18 gene promoter -137C/G and -607C/A polymorphisms in Chinese Han children with type 1 diabetes mellitus

Type 1 diabetes mellitus (T1DM) is a heterogeneous autoimmune disease, and both environmental and genetic factors play a role in its pathogenesis. Interleukin (IL)-18 is a potent pro-inflammatory cytokine capable of inducing interferon-gamma production that is associated with the development of T1DM. The gene for IL-18 is located on chromosome 11q22.2-q22.3 and has been reported to be associated with a susceptibility to T1DM. To test the putative involvement between IL-18 gene polymorphism and predisposition to T1DM, we conducted a case-control study in Chinese Han children. The single nucleotide polymorphisms at position -607(C/A) and -137(C/G) in the promoter region of the IL-18 gene were analysed by sequence-specific primers-polymerase chain reaction in 118 patients with T1DM and 150 healthy controls. (1) The allele frequency of -607A was 41.2% and 53.0%, respectively, in patients and in control subjects (P = 0.01), but the allele frequency of -137C/G was not statistically significant (P = 0.37). (2) The distribution of CC genotype at position -607 was significantly different between patients and normal controls (P = 0.03), while the distribution of AA genotype in patients was significantly lower than that in the controls (P = 0.03). (3) Furthermore, there was a significant increase in haplotype (-137C/-607G) and genotype combination (-137GG/ -607CC) in patients compared with controls (P = 0.03 and P = 0.04, respectively). The results of this study show that IL-18 gene promoter polymorphisms confer susceptibility to T1DM in Chinese Han children. Moreover, subjects carrying AA genotype at position -607 of the promoter of IL-18 gene may be a low risk of T1DM development.     

白细胞介素-18基因多态性与其表达量关系的研究

目的:探讨IL-18基因启动子-607C/A、-137G/C位点多态性是否影响其表达量。方法:选择80例体检健康个体,确定IL-18基因启动子区-137G/C、-607C/A位点基因型,分离上述研究对象外周血单个核细胞(PeripheralBloodMonocytes,PBMC),统一浓度培养24h后,收集培养细胞和上清液。采用ELISA检测上清液中IL-18的含量,并用RT-PCR检测培养细胞中IL-18mRNA的水平。结果:IL-18基因启动子-607位点CC、CA和AA基因型个体PBMC分泌IL-18的浓度分别为(11.54±6.48)ng/ml、(10.92±5.16)ng/ml和(11.79±3.18)ng/ml,表达IL-18mRNA水平分别为0.878±0.633、0.877±0.521和0.881±0.400;IL-18基因启动子-137位点GG、GC或CC基因型个体PBMC分泌IL-18的浓度分别为(11.27±5.42)ng/ml和(11.31±4.62)ng/ml,表达IL-18mRNA水平分别为0.835±0.485和0.984±0.613。两个位点各基因型间个体PBMC分泌和表达IL-18水平比较,差异无显著性(P>0.05)。结论:IL-18基因外显子1上游启动子-607C/A、-137G/C位点基因多态性对IL-18分泌和表达量没有明显影响。     

Interleukin-18 promoter polymorphism in patients with atopic asthma

Allergic asthma is a chronic inflammatory disease in which interleukin-18 (IL-18) plays an important role. However, there are controversial reports on IL-18 promoter polymorphism as an independent marker of asthma susceptibility. The aim of the present study was to examine the IL-18 promoter polymorphism in patients with allergic asthma. Two hundred and thirty-one patients with allergic asthma from a Polish population diagnosed according to the National Heart, Lung, and Blood Institute (NHLBI)/WHO guidelines were examined. An allele-specific polymerase chain reaction was used to analyse polymorphisms at positions -137 and -607 in the promoter region of the IL-18 gene. Neither in the -607 C>A nor in the -137 G>C promoter polymorphism were there any differences observed between the total group of asthmatic patients and the controls in the frequencies of genotypes, alleles, diplotypes or haplotypes. In patients with severe asthma, the -607 CC and -137 GG genotypes were observed significantly more frequently (P = 0.03 for both), whereas in patients with mild and moderate asthma, the -137 CC genotype was more prevalent than in the former group. The strongest difference between mild to moderate and severe asthma was observed in -137 allele frequencies (P = 0.006). The results of the present study suggest that the -137 G allele and the C-G/C-G diplotype seem to be involved in the pathogenesis of the severe form of asthma.     

Association of single nucleotide polymorphisms in the IL-18 gene with sarcoidosis in a Japanese population

Interleukin-18 (IL-18) and interleukin-12 (IL-12) synergistically stimulate interferon-gamma (IFN-gamma) production from Th1 cells. The levels of serum IL-18 and IFN-gamma and bronchoalveolar lavage fluid IL-18 were elevated in patients with sarcoidosis. The polymorphisms of the IL-18 gene may play a possible role in expression regulation of the gene. We investigated the roles of the polymorphisms in the development of sarcoidosis. We examined two single nucleotide polymorphisms of the IL-18 gene in 119 patients with sarcoidosis and 130 healthy control subjects. Our results showed that the frequency of sarcoidosis patients with the CA genotype at position -607 was significantly higher than that with the AA genotype (OR = 2.200) and a significantly higher proportion of patients had the C allele at -607 compared with that of the controls (OR = 2.123). No significant differences were seen in the distribution of the genotypes or phenotype frequencies at position -137. There was no specific organ involvement associated with a certain genotype or phenotype. In IL-18 gene polymorphisms, the C allele at position -607 might be a genetic risk factor for sarcoidosis in this Japanese population.     

Polymorphism of interleukin-18 promoter influences the onset of kidney graft function after transplantation

It has been well recognized that the promoter polymorphisms of interleukin-18 (IL-18) influence the level of cytokine expression. In our previously published data, we showed constitutive IL-18 expression in the epithelium of renal distal tubules in patients after kidney transplantation and significantly elevated IL-18 expression during acute rejection. In this study, we evaluated the clinical significance of two functional promoter polymorphisms of the IL-18 gene at positions -607 A/C (rs1946518) and -137 C/G (rs187238) in patients after kidney transplantation and looked for associations with the onset of graft function and the incidence of rejection episodes. Promoter polymorphisms in 124 patients and 103 unrelated controls were evaluated by sequence-specific primer polymerase chain reaction and the allele, genotype and haplotype frequencies were statistically correlated. We found a statistically different distribution of the allele frequency of -607 A/C polymorphism between patients with immediate or delayed onset of kidney graft function. Data showed that the C allele, which contributes to higher IL-18 expression, is more frequent in patients with delayed onset of function (P = 0.03, odds ratio = 1.93; 95% confidence interval = 1.15-3.25). A/C single nucleotide polymorphisms of the IL-18 promoter at position -607 may influence the onset of early kidney allograft function.     

白细胞介素-18基因多态性与广西壮族系统性红斑狼疮的遗传易感性

目的 探讨白细胞介素-18(interleukin 18,IL-18)基因单核苷酸多态性与广西壮族系统性红斑狼疮(systematic lupus erythematosus,SLE)易感性之间的关系.方法 以115例SLE患者和160名健康对照者为研究对象,应用聚合酶链反应-限制性片段长度多态性和DNA测序的方法对IL-18基因-137G/C、-607C/A单核苷酸多态性进行基因分型.结果 IL-18基因-137G/C多态性在SLE组和正常人群中的分布差异无统计学意义(P>0.05),而IL-18基因-607C/A多态性在两组人群中的分布差异有统计学意义(P<0.05),等位基因频率的相对风险分析发现,-607 C等位基因携带者患系统性红斑狼疮的风险是-607A等位基因的1.619倍(OR=1.619,95%CI:1.150-2.281).联合基因型分析发现,IL-18的-137G/-607C等位基因频率在SLE组中显著高于对照组(P<0.05).-137G/-607C等位基因携带者显著增加了SLE的发病风险(OR=1.484,95%CI:1.056-2.087).结论 IL-18基因-607C/A多态性与SLE的发病具有相关性,其中-607 C等位基因可能是SLE的遗传易感基因.     

Disease association of two distinct interleukin-18 promoter polymorphisms in Caucasian rheumatoid arthritis patients

Interleukin (IL)-18 is an important mediator of innate and adaptive immunity. We searched for an association of IL-18 promoter single-nucleotide polymorphisms (SNP) with rheumatoid arthritis (RA) in Caucasians. The entire study population was composed of two independent cohorts from Germany (n=200) and Scotland (n=410). Presence of IL-18 SNP at positions -607 and -137 was determined by allele-specific PCR in 327 RA patients and 283 healthy donors (HD). Diplotype distributions of both loci were in Hardy-Weinberg equilibrium (HWE) in the German and Scottish HD cohorts. In contrast, locus -607 was in HW disequilibrium in German, and locus -137 in Scottish RA patients. Diplotypic exact chi(2) tests suggested that -607CC was overrepresented in German, and -137CC in Scottish RA patients, but conservative chi(2) trend analyses could not prove any significant disease association of these single loci. SNP -607 and -137 were in strong linkage disequilibrium. The -607C(*)-137C haplotype was more prevalent in German RA (3.2 vs 1.2%) and in Scottish RA patients (4.1 vs 0.9%) than in the respective HD cohorts. These observations suggest that SNP of both positions contribute to the genetic background of RA pathogenesis.     

No association between interleukin-18 gene polymorphisms and haplotypes in Dutch sarcoidosis patients

Previously, an association between susceptibility to sarcoidosis and a polymorphism in the interleukin (IL-18) gene (IL-18 -607A/C) has been reported in Japanese. The aim of the present study was to validate this association in a clinically well-characterized population of Dutch Caucasians. Three other polymorphisms at positions -656, -137, and 1248 were included in order to extend the mapping of the IL-18 gene and to enable the construction of haplotypes. Polymorphisms were determined using sequence-specific primers (SSPs) and polymerase chain reaction (PCR). A total of 236 individuals was studied (133 patients and 103 controls). No significant differences were observed in the distribution of the -607 and the other polymorphisms between Dutch sarcoidosis patients and controls. However, significant differences in IL-18 -607 genotype and allele frequency distributions were found between the Dutch and the Japanese. From the investigated IL-18-promoter polymorphisms, we were able to deduce four haplotypes. No differences were observed in haplotype frequencies between Dutch sarcoidosis patients and controls. In conclusion, IL-18 polymorphisms do not appear to influence the susceptibility to sarcoidosis in Dutch Caucasians. Important differences in allele frequencies were observed between Japanese and Dutch sarcoidosis patients and controls.