肝硬化患者外周血单个核细胞TLR4表达及其基因多态性的研究

目的：检测肝硬化及其不同Child分级患者外周血单个核细胞(PBMCs)Toll样受体4（TLR4）表达，分析TLR4基因Asp299Gly、Thr399Ile的多态性及其与肝硬化疾病发生的相关性。方法:分离110例汉族乙肝后肝硬化患者与健康对照者静脉抗凝血的PBMCs，流式细胞、实时荧光定量PCR及PCR-限制性片段长度多态性分别检测PBMCs TLR4蛋白、 mRNA及Asp299Gly、Thr399Ile基因多态性，分析TLR4基因多态性与肝硬化发生的相关性。结果:肝硬化组PBMCs TLR4阳性细胞率与mRNA表达正相关，均显著高于对照组(P<0.01)，且随着Child评分的升高而升高(P<0.01)；但220例受试对象均未检测到TLR4基因Asp299Gly、Thr399Ile的突变型。结论:乙肝后肝硬化患者PBMCs TLR4表达水平明显增高，与肝硬化损伤的严重程度相关；TLR4基因Asp299Gly、Thr399Ile多态性在中国汉族人群中出现频率低，且与肝硬化疾病的易感性可能无关。     

TLR4 Asp299Gly、Thr399Ile基因多态性对变应性哮喘的发病及IgE水平的影响

目的　探讨TLR4 (toll likereceptor 4 )Asp2 99Gly、Thr399Ile基因多态性对变应性哮喘的发病和血浆IgE水平的影响。方法　利用聚合酶链反应 限制性片段长度多态性分析技术 (PCR RFLP) ,对 1 97例变应性哮喘患者和 1 5 6例健康人进行TLR4的Asp2 99Gly、Thr399Ile两位点的基因型检测。同时利用免疫发光法检测血浆IgE的水平。结果　 1 97例变应性哮喘患者TLR4基因Asp2 99Gly位点Asp Asp、Asp Gly和Gly Gly的基因型频率为 0 .81 7、0 .1 4 7和 0 .0 36 ,与正常对照组相比差异无统计学意义 (χ2 =0 .0 32 ,P =0 .984 ) ;但变应性哮喘患者Gly Gly、Asp Gly基因型血浆总IgE对数值 ( x±s:2 .6 1 5± 0 .6 0 0 1 ,n =36 )与Asp Asp基因型血浆总IgE对数值 ( x±s:2 .2 4 0± 0 .6 894 ,n =1 6 1 )相比较高 ,差异有统计学意义 (P =0 .0 0 2 )。TLR4基因Thr399Ile位点Thr Thr、Thr Ile和Ile Ile的基因型频率为 0 .970、0 .0 2 0和 0 .0 1 0 ,与正常对照组相比差异无统计学意义 (χ2 =0 .6 2 0 ,P =0 .733) ;变应性哮喘患者Ile Ile、Thr Ile基因型血浆总IgE对数值 ( x±s:2 .4 1 7± 0 .4 4 2 3,n =6 )与Thr Thr基因型血浆总IgE对数值 ( x±s:2 .30 5± 0 .6 94 9,n =1 91 )相比差异无统计学意义 (P =0 .5 71 )。     

CD14、TLR4 基因多态性与百色地区原住壮族人群脊柱结核易感关联性 研究

目的:研究脂多糖受体(CD14)和Toll样受体4(TLR4)基因多态性在壮族人群的分布特征及其与脊柱结核易感性的关系。方法:2011年1月至2017年12月期间右江民族学院附属医院就诊的百色地区原住壮族人群脊柱结核患者60例、肺结核患者60例和健康对照组60例三组人群,用A测序法测定三组人群的TLR4基因序列和CD14基因序列,比较三组人群CD14、TLR4基因多态位点的基因型频率和等位基因频率。结果:TLR4基因Asp299Gly和Thr399 Ile位点在壮族人群脊柱结核患者和肺结核患者均未发现呈多态性分布。壮族人群均发现CD14/-159呈多态性,以TT基因型为主,CD14基因C-159T和G-1145A等位基因频率按Hard-Weiber平衡吻合度检验,脊柱结核组、肺结核组和健康对照组三组含有T等位基因携带者的基因型频率和等位基因频率分布两两比较有统计学显著性差异(χ~2=8.462,P=0.004;χ~2=5.432,P=0.025;χ~2=7.321,P=0.021)。结论:百色地区壮族脊柱结核患者和肺结核患者未发现TLR4基因Asp299Gly和Thr399Ile多态性;百色地区壮族人群脊柱结核患者和肺结核患者存在CD14/-159多态性,以TT为主,CD14基因-159TT和-1145AA基因型可能为百色地区原住壮族人群脊柱结核病的易感高风险因子。     

广东汉族正常人群TLR4基因单核苷酸多态性研究(英)

目的：人类Toll样受体4（TLR4）是先天免疫系统中一个重要的病原微生物识别受体。本研究将建立中国汉族正常人群TLR4基因座位的单核苷酸多态性图谱。方法：收集191例健康、无亲缘关系的中国广东汉族人外周血液,通过对TLR4基因的启动子区、3个外显子区以及它们周围的内含子区进行PCR扩增和测序,得到汉族正常人群TLR4基因座位单核苷酸多态性图谱及其频率分布特点。结果：共发现8个单核苷酸多态性位点,其中5个是首次发现的新位点。分布频率最高（0.283）的单核苷酸多态性位点是-1607 C/T。常见于高加索人中的2个非同义突变Asp299Gly和Thr399Ile在汉族人中没有被发现。中性检验显示汉族人群TLR4基因符合中性进化模型。结论：本研究建立了汉族正常人群TLR4基因座位的单核苷酸多态性图谱,发现了一些种族特异性的单核苷酸多态性位点,这些工作将为今后开展汉族人基因多态性与疾病相关性研究以及人群进化研究提供一定的帮助。     

TLR4受体基因多态性与子宫内膜异位症相关性探讨

目的 研究TLR4受体基因多态性与子宫内膜异位症的相关性.方法 选取2013年1月至2016年1月我院妇科收治的220例手术患者为研究对象,其中120例EM患者为病例组,按照美国生育学会EM分期标准(r-AFS)分期,Ⅰ~Ⅱ期患者为67例,Ⅲ~Ⅳ期患者为53例,100例同期手术妇女为对照组.对患者血液中DNA进行采集,分析TLR4受体基因多态性与子宫内膜异位症的相关性.结果 在对两组患者基因型研究结果显示,纯合子Asp299Gly基因型在病例组的检出结果110(0.92)高于在对照组患者中的检出结果23(0.23)P<0.05,差异具有显著统计学意义,纯合子Thr/Ile在病例组检出结果111(0.92)高于在对照组检出结果20(0.20),P<0.05,差异具有统计学意义.在对不同分期EM患者基因型研究结果显示,纯合子Asp299Gly基因型和Thr/Ile基因型在III~IV期的检出结果0.92高于在I~II期患者中的检出结果0.88,P<0.0,提示差异具有显著统计学意义.结论 TLR4基因多态性与子宫内膜异位症存在相关性,可以作为子宫内膜异位症诊断的辅助手段.     

强直性脊柱炎与IL-23R基因多态性关联的Meta分析

探讨IL-23R基因多态性与中国人群强直性脊柱炎的相关性。系统检索PubMed、FMJS、CNKI及万方数据库有关IL-23R基因多态性与强直性脊柱炎相关的病例对照研究,应用ReveMan 5.2软件进行Meta分析。本研究共纳入IL-23R基因多态性与强直性脊柱炎相关文献9篇。Meta分析结果显示:IL-23Rrs1004819(OR=1.02,95%CI:0.90~1.14)、rs11209032(OR=0.91,95%CI:0.74~1.11)、rs1343151(OR=0.80,95%CI:0.59~1.08)和rs10889677(OR=0.95,95%CI:0.83~1.09)与强直性脊柱炎无显著关联,rs10489629(OR=0.78,95%CI:0.64~0.95)是强直性脊柱炎的保护性因素。可见部分IL-23R基因多态性与中国人群AS易感性无关联,需要进一步探索与中国人群AS易感性相关的其他基因位点。     

MMP-9 R279Q基因多态性与冠心病易感性的Meta分析

 目的 探讨MMP-9 R279Q基因多态性与冠心病易感性的关系。方法 检索PubMed,获取2012年1月1日以前发表的MMP-9 R279Q基因多态性与冠心病易感性的病例-对照研究。以冠心病组与对照组人群基因型分布的OR值及95%CI为效应指标,在纯合子比较模型、显性模型和隐性模型中采用固定效应方法进行合并分析, 并进行偏倚评估,应用STATA11.0软件进行统计学处理。结果 共纳入文献5篇,在MMP-9 R279Q多态性位点,基因型比较模型中合并OR值为0.925 (95% CI = 0.847-1.009),纯合子比较模型合并OR值为0.866 (95% CI = 0.713-1.052),显性模型合并OR值为0.909 (95% CI = 0.809-1.020),隐性模型合并OR值为0.902 (95% CI = 0.750-1.086)。结论 MMP-9 R279Q基因多态性可能与冠心病易感性无关。     

GJB2基因p.V37I变异及类型与耳聋致病风险的荟萃分析

目的探讨GJB2基因p.V37I变异及类型与耳聋致病风险的相关性。方法检索时间为建库至2021年4月23日的PubMed、Embase、Cochrane Library、中国知网、万方数据资源及维普等数据库, 查找关于GJB2基因c.109G>A(p.V37I)变异及复合其他位点变异与耳聋相关的病例-对照研究、队列研究以及横断面研究报道。按照纳入与排除标准筛选文献、提取资料并按评价标准评价纳入的研究, 采用Stata 12.0软件进行荟萃分析和发表偏倚分析, 必要时做敏感性分析。结果共纳入22篇文献(英文17篇, 中文5篇), 耳聋组7455例, 对照组10 464例。荟萃分析结果提示GJB2等位基因c.109G>A(p.V37I)变异与耳聋致病风险显著相关(OR: 3.56, 95%CI: 2.31-5.47,P<0.001)。按GJB2基因p.V37I变异的类型进行分析的结果显示:p.V37I(109G>A)纯合变异(OR: 11.36, 95%CI: 5.93-21.74,P<0.001)、复合杂合截短变异(OR: 9.27, 95%CI: 3.97...     

血管内皮生长因子基因多态性与先天性心脏病相关性的Meta分析

目的 评价血管内皮生长因子（VEGF）等位基因、基因型、基因单倍型多态性与先天性心脏病（CHD）的相关性.方法 检索Cochrane图书馆、Medline、PubMed、EMBASE、中国期刊全文数据库、万方数据库及中国生物医学文献数据库,检索起止时间均为建库至2011年12月,并且对重要文献的参考文献采取手工回溯检索.获取VEGF与CHD相关性的病例对照研究和传递不平衡检验文献.对文献进行质量评价.采用RevMan 5.1.1软件进行异质性检验,根据检验结果选择适当的效应模型进行Meta分析.结果 6篇文献共10项独立研究纳入分析,漏斗图检验存在发表偏倚.Meta分析结果显示：① VEGF C-2578A和G-1154A位点等位基因变异显著增加DiGeorge综合征患者的CHD易感性,OR分别为1.40（95%CI：1.04～1.16）和1.87（95%CI：1.27～2.75）;G-634C位点的等位基因变异显著增加普通病例的CHD易感性,OR=1.29,95%CI：1.02～1.62.② G-1154A位点（AA＋AG）为DiGeorge综合征患者合并CHD的危险因素,OR=2.10,95%CI：1.32～3.34.③单倍型AAG在DiGeorge综合征患者中显著增加CHD易感性,OR=1.82,95%CI：1.31～2.54;单倍型CGC显著降低普通病例CHD风险的保护作用,OR=0.79,95%CI：0.63～0.99.结论 VEGF等位基因、基因型、基因单倍型多态性与CHD易感性存在一定的相关性,且在DiGeorge综合征患者与普通患者间存在差异;在不伴DiGeorge综合征的人群中,特定单倍型（CGC）则有显著降低CHD风险的保护作用,其作用机制尚需进一步明确.     

DNA修复基因XRCC1-Arg399G1n多态位点与壮族甲状腺相关眼病的相关性分析

目的 探讨DNA修复基因XRCC1-Arg399Gln多态性与甲状腺相关眼病（TAO）的相关性。方法 用PCR-RFLP法检测182例TAO患者和182例健康对照者的XRCC1-Arg399Gln多态性。结果 TAO组和对照组的等位基因分布有差异, TAO组突变等位基因（A）频率高于健康对照组（P〈0.001）;与野生型(GG)相比,携带变异基因的个体（GA+AA）可增加TAO的发病风险（OR值为1.863,95%CI为1.228~2.826,P＜0.05）。对于TAO,携带变异基因或吸烟单一因素的OR值分别为1.343(95%CI 0.764~2.36)和2.0274(95%CI 1.121~3.667),但携带变异基因者如果吸烟,OR值则高达4.981(95%CI 2.697~9.1998)。结论 XRCC1Arg399G1n位点A等位基因（Gln）可能是TAO的易感基因,其多态与吸烟可能存在联合作用。     

Toll-like receptor 4 Asp299Gly and Thr399Ile polymorphisms in gastric cancer of intestinal and diffuse histotypes

In the present study we investigated the potential role of Toll-like receptor 4 (TLR-4) Asp299Gly and Thr399Ile polymorphisms as risk factors in the development of gastric cancer. TLR-4 Asp299Gly and Thr399Ile polymorphisms were investigated in 171 Italian patients with sporadic gastric cancer and in 151 controls. Unconditional regression (odds ratio and 95% confidence intervals) were used to investigate the association of the studied polymorphisms with gastric cancer. TLR-4 Thr399Ile polymorphism is linked with an increased susceptibility to gastric cancer (P = 0.023 and hazard ratio = 3.62). No significant association for TLR-4 Asp299Gly polymorphism was found. In the subgroup of patients with intestinal-type gastric cancer, a significant risk of gastric cancer was associated with TLR-4 Thr399Ile genotype (P = 0.006). Our results demonstrated that TLR-4 Thr399Ile polymorphism is linked with an increased susceptibility to gastric cancer. An increased risk for intestinal gastric cancer in carriers of the TLR4 Thr399Ile allele was observed. Future epidemiological studies should consider the possible interactions between proinflammatory genotypes (such as TLR and interleukin-1R polymorphisms) and other risk factors for cancer such as dietary habits and/or exposure to environmental carcinogens.     

Toll-like receptor (TLR) 2 and 4 mutations in periodontal disease

Toll-like receptors (TLR) are signal molecules essential for the cellular response to bacterial cell wall components. Different functional effective polymorphisms for the TLR 4 gene (Asp299Gly; Thr399Ile) and for the TLR 2 gene (Arg677Trp, Arg753Gln) have recently been described that are associated with impaired lipopolysaccharide signal transduction. A total of 122 patients with chronic periodontal disease and 122 healthy unrelated controls were genotyped for the Asp299Gly and Thr399Ile polymorphism of the TLR 4 gene and the Arg677Trp and Arg753Gln mutation of the TLR 2 gene. The mutations were identified with polymerase chain reaction followed by restriction fragment length polymorphism (RFLP) analysis. The prevalence of the Asp299Gly and the Thr399Ile mutant allele was 4.1% (10/244) and 4.5% (11/244) among periodontitis patients. For the healthy controls the prevalence was 3.3% (8/244) for the Asp299Gly (P = 0.810) and 3.7% (9/244) for the Thr399Ile mutant allele (P = 0.819). The Arg753Gln mutant allele was found in 2.9% (7/244) of the periodontitis subjects as compared to 4.1% (10/244) in the control group (P = 0.622). The Arg677Trp mutant allele was not found in any of the study subjects. Unlike in ulcerative colitis there was not observed an association between chronic periodontitis and the various mutations of the TLR 2 and 4 gene.     

Single step high-throughput determination of Toll-like receptor 4 polymorphisms

BACKGROUND: Toll-like receptors are central components of host defence in humans, responsible for recognition of pathogen-associated molecular patterns and activation of innate immunity. Toll-like receptor 4 (TLR4) is activated by lipopolysaccharide (LPS) and other microbial components, thereby initiating the expression and release of pro-inflammatory cytokines. The common, frequently co-segregating allelic variants Asp299Gly and Thr399Ile have been related to susceptibility to gram-negative infections and sepsis and may be involved in the development of atherosclerosis. Identification of TLR4 Asp299Gly and Thr399Ile genotypes can be important for examination of genotype/phenotype relationships as well as for individual risk assessment of patients. METHODS: TLR4 Asp299Gly and Thr399Ile genotypes were detected by a single tube polymerase chain reaction (PCR), based on exonuclease degradation of dual labelled allele-specific oligonucleotides. The assay results were compared with conventional restriction fragment length polymorphism (RFLP) analysis. RESULTS: Genotypes of 345 individuals were determined simultaneously in a single PCR assay. Allele frequencies for our population were 6.8% for the TLR4 Asp299Gly polymorphism and 6.4% for the Thr399Ile polymorphism. Validation by RFLP analysis revealed a correct detection of all genotypes. CONCLUSIONS: We have developed a novel method for the detection of the TLR4 Asp299Gly and Thr399Ile mutations, permitting rapid genotyping which should be useful for large-scale population studies as well as applicable for routine clinical testing.     

Adiposity and bone mineral density of Chilean elderly women in relation to toll-like receptor 4 gene polymorphisms

BACKGROUND: It has been proposed that the toll-like receptor-4 gene (TLR4) may participate in the development of obesity and osteoporosis, in addition to its well-known role in the immune response. On the other hand, the adipose tissue of obese subjects shows an increased expression of the proinflammatory cytokine, tumour necrosis factor-alpha (TNF-alpha), which is released after lipopolysaccharide recognition by TLR4. AIM: To estimate the allele/genotype frequencies and linkage disequilibrium measures of Asp299Gly and Thr399Ile polymorphisms of the TLR4 gene in the Chilean elderly population, and to screen for their association with variables related to adiposity or bone mineral density. SUBJECTS AND METHODS: The study group included 227 unrelated Chilean elderly women (61-95 years) recruited from a population-based sample. Adiposity and bone mineral density measures were obtained using dual-energy X-ray absorptiometry. RESULTS: The allele frequencies for TNF -308A, TLR4 299Gly and TLR4 -399Ile were 9.3%, 4.6% and 4.4%, respectively, with Asp299Gly and Thr399Ile being in strong linkage disequilibrium (D' = 0.88). Although seriously restricted by the low frequency of the allele variants, no relevant association between genotypes and adiposity-related variables were found. Likewise, no significant association between osteoporosis status (categorized as osteoporosis, osteopenia or normal status) with TLR4 Asp299Gly or TNF -308G>A genotypes was found. CONCLUSION: It is unlikely that TLR4 Asp299Gly, TLR4 Thr399Ile or TNF -308G>A polymorphisms have a major influence on adiposity, bone mineral density or osteoporosis status in Chilean elderly women.     

Toll-like receptor (TLR) 4 polymorphisms are associated with a chronic course of sarcoidosis

The aetiology of sarcoidosis, an inflammatory granulomatous multi-system disorder, is unclear. It is thought to be the product of an unknown exogenous antigenic stimulus and an endogenous genetic susceptibility. Toll-like receptors (TLR) are signal molecules essential for the cellular response to bacterial cell wall components. Lipopolysaccharide (LPS), for example, binds to TLR 4. Two different polymorphisms for the TLR4 gene (Asp299Gly and Thr399Ile) have been described recently. This leads to a change in the extracellular matrix function of TLR4 and to impaired LPS signal transduction. We genotyped a total of 141 Caucasian patients with sarcoidosis and 141 healthy unrelated controls for the Asp299Gly and Thr399Ile polymorphisms in the TLR4 gene. The mutations were identified with polymerase chain reaction followed by restriction fragment length polymorphism (RFLP) analysis. Among sarcoidosis patients the prevalence for each Asp299Gly and Thr399Ile mutant allele was 15.6% (22/141). In the control group the prevalence was 5.67% (8/141) (P = 0.07). In the subgroup of patients with acute sarcoidosis there was no difference in the control group (P = 0.93), but there was a highly significant association between patients with a chronic course of sarcoidosis and TLR4 gene polymorphisms (P = 0.01).     

Adiposity and bone mineral density of Chilean elderly women in relation to toll-like receptor 4 gene polymorphisms

Background: It has been proposed that the toll-like receptor-4 gene (TLR4) may participate in the development of obesity and osteoporosis, in addition to its well-known role in the immune response. On the other hand, the adipose tissue of obese subjects shows an increased expression of the proinflammatory cytokine, tumour necrosis factor-alpha (TNF-α), which is released after lipopolysaccharide recognition by TLR4.

Aim: To estimate the allele/genotype frequencies and linkage disequilibrium measures of Asp299Gly and Thr399Ile polymorphisms of the TLR4 gene in the Chilean elderly population, and to screen for their association with variables related to adiposity or bone mineral density.

Subjects and methods: The study group included 227 unrelated Chilean elderly women (61–95 years) recruited from a population-based sample. Adiposity and bone mineral density measures were obtained using dual-energy X-ray absorptiometry.

Results: The allele frequencies for TNF ?308A, TLR4 299Gly and TLR4 ?399Ile were 9.3%, 4.6% and 4.4%, respectively, with Asp299Gly and Thr399Ile being in strong linkage disequilibrium (D′?=?0.88). Although seriously restricted by the low frequency of the allele variants, no relevant association between genotypes and adiposity-related variables were found. Likewise, no significant association between osteoporosis status (categorized as osteoporosis, osteopenia or normal status) with TLR4 Asp299Gly or TNF ?308G>A genotypes was found.

Conclusion: It is unlikely that TLR4 Asp299Gly, TLR4 Thr399Ile or TNF ?308G>A polymorphisms have a major influence on adiposity, bone mineral density or osteoporosis status in Chilean elderly women.     

A unique display of toll-like receptor 4 Asp299Gly and Thr399Ile polymorphisms in non-Han Chinese Hani population

The toll-like receptor 4 (TLR4) polymorphisms, Asp299Gly and Thr399Ile, were investigated with PCR-RFLP and DNA sequencing methods in 938 and 980 individuals from the Yunnan Hani ethnic minority and the majority Han population, respectively. Six heterozygotes for both Asp299Gly and Thr399Ile were detected in the Hani, a polymorphism frequency of 0.6397%, whereas no variants were found amongst the Han.     

Rarity of TLR4 Asp299Gly and Thr399Ile polymorphisms in the Korean population

PURPOSE: Activation of the innate immune system and chronic low-grade inflammation are thought to be involved in the pathogenesis of atherosclerosis and also thought to be associated with type 2 diabetes and its complications. As a receptor for bacterial lipopolysaccharide and heat-shock proteins, Toll-like receptor 4 (TLR4) is one of the central regulators of the immune response. Recent studies have reported an association between TLR4 polymorphisms and diabetes and its complications in Caucasian populations. MATERIALS AND METHODS: In this study, we analyzed the association between TLR4 gene polymorphisms in patients with features of type 2 diabetes and healthy controls in Korea. Two polymorphisms of the TLR4 gene (Asp299Gly and Thr399Ile) were examined in 225 diabetic patients and 153 healthy controls using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) and single-strand conformation polymorphism (SSCP). RESULTS: No Asp299Gly or Thr399Ile mutations were detected in any of the 378 subjects. Seven subjects from each group who had slightly different SSCP patterns were selected for sequencing, but we found no TLR4 polymorphisms on Exon3. The Asp299Gly and Thr399Ile TLR4 gene polymorphisms were absent in both groups, which was similar to the results for Japanese and Chinese Han subjects. CONCLUSION: Our data and other Asian data suggest that a racial difference can be found in the frequency of the TLR4 polymorphism.     

Association of Helicobacter pylori infection with Toll‐like receptor‐4 Thr399Ile polymorphism increased the risk of peptic ulcer development in North of Iran

Toll‐like receptor‐4 (TLR4) polymorphisms may influence host immune response against Helicobacter pylori (H. pylori). This study aimed to investigate whether TLR4 polymorphisms are associated with H. pylori susceptibility and risk of peptic ulcer development or not. The TLR4 + 3725 G/C polymorphism was studied using polymerase chain reaction with confronting two‐pair primers (PCR–CTPP). In addition, TLR4 Asp299Gly and Thr399Ile polymorphisms were evaluated by PCR‐restriction fragment length polymorphism (RFLP). There was no significant difference in TLR4 + 3725 G/C and Asp299Gly genotype frequencies between non‐peptic ulcer (NPUD) and peptic ulcer (PUD) individuals in the context of peptic ulcer development and susceptibility to infection with H. pylori. Nevertheless, a significant association with increased risk for PUD development was observed for polymorphism TLR4 Thr399Ile [odds ratio (OR) = 4.2; 95% confidence interval (CI) = 1.35–13.26; p = 0.01]. Correspondingly, TLR4 Thr399Ile polymorphism was associated with H. pylori susceptibility (OR = 0.27; 95% CI = 0.08–0.88; p = 0.04). In addition, TLR4 Thr399Ile polymorphism increased 4.2‐fold, the risk of peptic ulcer development in individuals infected by H. pylori carrying CT + TT genotype. Our results showed that TLR4 Thr399Ile polymorphism along with H. pylori infection may play critical roles in peptic ulcer development in North of Iran.