关节病型银屑病易感基因研究进展

关节病型银屑病(PsA )是一种伴有炎症性关节病变的严重类型银屑病.遗传流行病学研究显示与寻常型银屑病相比,PsA 具有更强的遗传易感性.近期全基因组关联研究发现了IL-12B 、IL-23R、TNF AIP3、TNIP1、IL-13、LCE等多个易感基因位点,揭示了Th17 细胞通路、NFκB通路、Th2 细胞通路、表皮分化通路等在银屑病和PsA发病机制中的作用.     

汉族人银屑病患者 IL －23R 单核苷酸多态性的研究

目的：探讨白细胞介素-23受体（IL-23R）基因多态性与中国汉族人群银屑病易感性的关系。方法：在NCBI数据库上检索 IL-23R 的7个 SNP 位点（ rs11209026、rs1004819、rs10489629、rs1343151、rs10889677、rs11209032、rs1495965）。从门诊病人中收集银屑病患者93例,选择健康献血员108例作为正常对照,检测共201例样品中7个SNP位点突变情况。多态性及其单倍型与银屑病相对危险度等数据处理均采用SPSS软件系统进行。结果：7个TagSNP位点中有4个等位基因（ rs1004819、rs1343151、rs10889677、rs1495965）频率在病例组和对照组之间的差异有统计学意义（ P＜0.01）。结论：IL-23R基因多态性与汉族人银屑病易感性有关联。其中 4个 SNP 位点（ rs1004819、rs1343151、rs10889677、rs1495965）与银屑病发病明显相关。     

代谢综合征相关基因多态性与蒙古族寻常型银屑病的相关性及与HLA-C*06：02交互作用研究

【摘要】 目的 探讨代谢综合征相关基因多态性与蒙古族寻常型银屑病（PsV）的相关性及其与HLA-C*06：02的交互作用。方法 内蒙古医科大学附属医院2012年12月至2018年3月住院的379例蒙古族PsV患者及518例蒙古族健康对照。选择16个既往报道的与代谢综合征及其包含疾病相关的单核苷酸多态性（SNP）及HLA-C*06：02，利用二代测序法和聚合酶链反应-序列特异性引物（PCR-SSP）对受试者进行基因分型。计算蒙古族PsV组及对照组16个变异位点及HLA-C*06：02的最小等位基因频率，χ2检验比较两组各SNP位点的最小等位基因频率差异。结果 蒙古族PsV患者中16个代谢综合征易感SNP位点最小等位基因频率与健康对照比较，差异无统计学意义（均P > 0.05），而HLA-C*06：02位点的最小等位基因频率差异有统计学意义（P = 4.09 × 10-35，OR = 3.41）。HLA-C* 06：02阳性受试者中，252例PsV患者的rs7593730_T和rs6931514_G最小等位基因频率与191例健康对照相比差异有统计学意义（P = 0.016，OR = 0.64；P = 0.041，OR = 1.33）；而在HLA-C*06：02阴性受试者中，两组间16个SNP位点的最小等位基因频率差异均无统计学意义（P > 0.05）。结论 rs7593730和rs6931514与内蒙古地区蒙古族寻常型银屑病可能相关，与HLA-C*06：02可能存在交互作用。     

ERAP1基因与银屑病的相关性研究进展

银屑病是一种免疫介导的慢性炎症性皮肤病,遗传因素在发病中起重要作用。ERAP1基因现已被证实为银屑病的易感基因,目前研究发现ERAP1基因分子的功能与银屑病的发病相关,ERAP1基因与其他银屑病易感基因、环境因素之间的交互作用可能参与银屑病发病,其基因型可能影响银屑病患者的临床表型(发病年龄、发病严重程度、皮损类型、伴发疾病、家族史等)。     

IL-12B和IL-23R基因多态性与中国汉族人银屑病易感性关联研究

目的 探讨中国汉族人群中IL-12B和IL-23R基因多态性与银屑病易感性的关系。方法 在217例银屑病患者和288例正常人对照中,采用DNA直接测序法对IL-12B和IL-23R基因的多态性位点进行基因分型,并将阳性结果在一个更大的包括578例银屑病患者和1422例正常人对照的整合样本群中,使用Taqman探针荧光PCR技术进行重复检验。实验数据进行Hardy-Weinberg平衡检验、卡方检验、单倍型分析和Logistic回归模型分析。结果 IL-12B rs6887695位点等位基因频率在病例组与对照组之间差异有统计学意义,OR = 1.33（95% CI 1.03 ~ 1.73）,P = 0.028;IL-23R rs11465817和rs1343152位点等位基因频率在病例组与对照组之间差异无统计学意义（P > 0.05）。连锁不平衡分析发现,rs11465817和rs1343152位点之间有一定的连锁不平衡（D′ = 0.744,r2 = 0.281）。对2个位点进行单倍型分析发现,A-A ∶ OR = 2.890,P = 0.0018,提示这一单倍型具有显著的发病风险。结论 IL-12B基因rs6887695多态性与中国汉族人群银屑病易感性相关;IL-23R基因rs11465817、IL-23R基因rs1343152位点多态性与中国汉族人群银屑病易感性无显著相关性,但是,IL-23R基因rs11465817-rs1343152位点A-A单倍型的中国汉族人具有更高的银屑病发病风险。     

内蒙古汉族寻常型银屑病REL基因多态位点检测

目的：检测内蒙古汉族人寻常型银屑病（PsV）患者禽网状内皮组织增殖病毒癌基因V-Rel同源基因（REL）的多态性。方法：提取301例PsV患者及292例正常对照外周血DNA,利用连接酶检测反应检测REL基因区域的4个单核苷酸多态性（SNP）（rs702873、rs842636、rs13031237 和 rs13017599）。结果：PsV患者rs702873和rs842636的等位基因频率分别为0.126和0.128,对照组中分别为0.182和0.181,差异有统计学意义(P<0.05)且rs702873和rs842636间存在强连锁不平衡（D’=0.993,r2=0.980）。rs13031237和rs13017599等位基因频率在PsV患者和对照组中差异无统计学意义(P>0.05)。结论：REL基因位点（rs702873和rs842636）多态性可能与内蒙古汉族人PsV的易感性相关。     

银屑病基因-基因交互作用研究进展

全基因组关联研究发现,对基因-基因交互作用在银屑病发病中的研究取得了积极进展,增进了对银屑病遗传学发病机制的认识。目前,银屑病基因-基因交互作用主要集中在主要组织相容性复合体易感区域和IL23／Thl7信号通路。主要组织相容性复合体区域是最早被发现而且是银屑病发病机制中最重要的易感区域。研究表明,其与内质网氨基肽酶1（ERAPl）基因、抑半胱氨酸蛋白酶蛋白A（CSTA）基因、LCE基因簇及染色体19p13区域（PSORS6）等存在相互作用。白介素23／Thl7是一个与慢性炎症性疾病发病密切相关的重要通路,研究发现其中的多个基因在银屑病发病中存在交互作用。     

内质网氨基肽酶1基因rs27044、rs30187和rs26653多态性与汉族寻常性银屑病相关性研究

目的 探讨内质网氨基肽酶1（ERAP1）基因多态性与汉族人寻常性银屑病的遗传关联性。 方法 收集寻常性银屑病患者289例,对照组292例,知情同意后采集外周静脉血5 ml。选择位于ERAP1基因编码区域的3个单核苷酸多态性（SNP）,利用连接酶检测反应进行基因分型（rs27044、rs30187和rs26653）。利用PLINK1.07软件进行统计分析,χ2检验比较患者组与对照组等位基因频率及基因型频率,计算等位基因的相对危险度估计值比值比（OR）及其95%可信区间（95% CI）。利用Haploview软件进行单倍型分析。 结果 rs30187等位基因C及rs26653等位基因G在患者组的频率（分别为0.460 2和0.430 8）、尤其是早发型组中的频率（0.448 5和0.422 7）均明显低于对照组（0.534 2和0.501 7）,差异均有统计学意义（均P < 0.05）。rs27044、rs30187及rs26653这3个SNP两两间均存在强连锁不平衡（r2 ≥ 0.717,D′ ≥ 0.962）。基因型分析结果显示,在隐性遗传模式下,rs30187在患者组及早发型组的基因型频率均显著低于对照组,差异均有统计学意义（P值分别 < 0.05和 < 0.016 7）。单倍型分析发现,单倍型（H4：CTC）在患者组的频率（0.050）、尤其是早发型组的频率（0.052）均明显高于对照组（0.022）,差异均有统计学意义（P值分别 < 0.05、 < 0.016 7）。 结论 ERAP1基因多态性与汉族人寻常性银屑病可能相关,特别是早发型患者。危险单倍型（H4：CTC）可能是寻常性银屑病一个重要的易感因素。     

染色体4q存在中国汉族人的银屑病易感基因

目的：确定在4号染色体长臂上是否存在中国汉族人寻常性银屑病易感基因。方法：用覆盖4号染色体长臂的12个微卫星标记对64个寻常性银屑病家系共372个个体（包括197例患者和175例非患者）进行基因组扫描研究，并用GENEHUNTER软件（2.0 Version)对基因分型结果进行参数和非参数连锁（NPL）分析。结果：（1）非参数连锁分析：两点连锁分析揭示D4S413和D3S1597的NPL值分别为2．04和2．23，对应的P值分别为0．021和0．014；多点连锁分析在染色体155．1－172．3cM的范围NPL值均大于3，在位点D4S413（157．9cM)处NPL值达最高，为3．44，相应的P值为0．00056。（2）参数连锁分析在显性遗传模式下，外显率10％，基因频率0．0062时在D4S1597位点处得出LOD值＝3．70，异质性LOD（HLOD）值＝4．35和较高的连锁家系比例α=85%。结论：染色体4q存在中国汉族人的寻常性银屑病易感基因。     

中国汉族人群白癜风6q27区域易感基因精细定位研究

目的:对中国汉族人群白癜风6q27易感区域进行精细定位研究,以期发现白癜风易感基因。方法:收集2942例白癜风患者和2850名正常对照标本,对6q27易感区域内的24个标签SNP位点进行基因分型。采用Plink 1.07和SPSS19.0软件进行统计分析,同时进行条件回归分析和连锁不平衡分析。结果:(1)SNP位点rs2236313、rs9457258、rs720325、rs968334、rs3093025、rs55802221、rs1012656、rs6930998和rs1331299的等位基因频率在病例组和对照组之间具有显著差异,但是通过条件回归分析结果提示没有新的独立信号存在;(2)连锁不平衡分析结果显示rs2236313、rs9457258、rs720325、rs968334和rs30930255位点间具有中度连锁关系(D'0.7,r20.4)。结论:本文证实既往报道的SNP是标签SNP,根据基因型填补以后的注释结果认为白癜风6q27区域的关联基因为RNASET2基因。     

Investigation of 20 non‐HLA (human leucocyte antigen) psoriasis susceptibility loci in Chinese patients with psoriatic arthritis and psoriasis vulgaris

Background Recently, a number of non‐HLA (human leucocyte antigen) psoriasis genetic susceptibility loci have been identified through genome‐wide association studies, but data on their association with psoriatic arthritis (PsA) are lacking. Objectives To investigate recently identified psoriasis susceptibility loci in a cohort of Chinese patients with PsA, psoriasis vulgaris (PsV) and healthy controls. Methods Twenty single‐nucleotide polymorphisms (SNPs) from 20 loci were selected for genotyping in 379 patients with PsA, 595 patients with PsV and 1181 healthy controls using the MassARRAY platform (Sequenom, San Diego, CA, U.S.A.). Data handling, quality control and association were performed using PLINK software, v. 1.07. The Cochran–Armitage trend test was used to test the genotype–phenotype association. Results PsA showed a significant association with markers at TNIP1 (rs17728338, P = 2·20 × 10^?8), IL28RA (rs4649203, P = 5·04 × 10^?6), IL12B (rs2082412, P = 3·82 × 10^?5), ERAP1 (rs27524, P = 1·25 × 10^?3), PTTG1 (rs2431697, P = 1·22 × 10^?3) and GJB2 (rs3751385, P = 1·48 × 10^?3) when compared with the control group. In PsV a significant association was found for IL28RA (rs4649203, P = 9·53 × 10^?7), TNIP1 (rs17728338, P = 1·21 × 10^?4) and ERAP1 (rs27524, P = 1·17 × 10^?3). The allele frequencies were not statistically different between PsA and PsV except for SNPs at IL12B and ZNF816A with a nominal P‐value of 0·04 and 0·01, respectively. Conclusions This study provides evidence for the involvement of ERAP1, IL28RA, GJB2 and PTTG1 loci in PsA susceptibility and confirmed the previously reported association with PsA and PsV. These results support the hypothesis that genetic aetiology of psoriasis is the same in both PsA and PsV and also support the higher genetic component of PsA than PsV.     

Genome-wide meta-analysis of psoriatic arthritis identifies susceptibility locus at REL

Psoriatic arthritis (PsA) is a chronic inflammatory musculoskeletal disease affecting up to 30% of psoriasis vulgaris (PsV) cases and approximately 0.25 to 1% of the general population. To identify common susceptibility loci, we performed a meta-analysis of three imputed genome-wide association studies (GWAS) on psoriasis, stratified for PsA. A total of 1,160,703 single-nucleotide polymorphisms (SNPs) were analyzed in the discovery set consisting of 535 PsA cases and 3,432 controls from Germany, the United States, and Canada. We followed up two SNPs in 1,931 PsA cases and 6,785 controls comprising six independent replication panels from Germany, Estonia, the United States, and Canada. In the combined analysis, a genome-wide significant association was detected at 2p16 near the REL locus encoding c-Rel (rs13017599, P=1.18 × 10(-8), odds ratio (OR)=1.27, 95% confidence interval (CI)=1.18-1.35). The rs13017599 polymorphism is known to associate with rheumatoid arthritis (RA), and another SNP near REL (rs702873) was recently implicated in PsV susceptibility. However, conditional analysis indicated that rs13017599, rather than rs702873, accounts for the PsA association at REL. We hypothesize that c-Rel, as a member of the Rel/NF-κB family, is associated with PsA in the context of disease pathways that involve other identified PsA and PsV susceptibility genes including TNIP1, TNFAIP3, and NFκBIA.     

Polymorphisms of the IL12B and IL23R genes are associated with psoriasis

Psoriasis is a common inflammatory and hyperproliferative skin disease with a multifactorial genetic basis. A recent study reported that psoriasis was associated with the IL12B haplotype rs3212227 (3'-untranslated region)-rs6887695 (60 kb, 5') and the IL23R haplotype rs7530511 (L310P)-rs11209026 (Q381R). We examined these four single-nucleotide polymorphisms (SNPs) for association with psoriasis in two groups of North American and German Caucasians: (1) 1,810 cases and 2,522 controls; and (2) 509 pedigrees. Both IL12B markers showed highly significant association with psoriasis in the case-control (rs3212227, odds ratio (OR)=1.62, P=1.7 x 10(-15); rs6887695, OR=1.49, P=2.7 x 10(-15)) and in the family-based analysis (rs3212227, P=2.2 x 10(-3); rs6887695, P=1.7 x 10(-3)). The IL23R SNPs also showed significant association in the cases and controls (rs7530511, OR=1.22, P=3.9 x 10(-3); rs11209026, OR=1.40, P=3.8 x 10(-4)). For both genes, common risk haplotypes were identified whose statistical significance approached (IL23R) or exceeded (IL12B) genome-wide criteria. We found no statistical evidence for interactions of these haplotypes with HLA-Cw6. Our results confirm associations between IL12B and IL23R and psoriasis in Caucasians, and provide a genetic basis for the clinical association between psoriasis and Crohn's disease.     

Interleukin-12 p40 gene (IL12B) 3'-untranslated region polymorphism is associated with susceptibility to atopic dermatitis and psoriasis vulgaris

Interleukin-12 (IL-12) is believed to play an important role in inducing Th1-type cytokine profiles. Atopic dermatitis (AD) and psoriasis vulgaris (PsV) are considered to be Th2 and Th1 type disease, respectively. The IL-12 p40 subunit gene (IL12B) is located at chromosome 5q31-33 and linkage findings of AD on 5q31 were reported. Recently single nucleotide polymorphism (SNP) (1188A/C) of IL12B has been reported. In function, it has been reported that this SNP is associated with IL12B mRNA expression levels. To learn whether this SNP is associated with susceptibility to AD or PsV, we investigated the genotype and allele frequencies of the SNP in AD patients, in PsV patients and in controls, examining 164 AD patients, 143 PsV patients and 100 healthy individuals in Japanese population. Genotyping was performed using the polymerase chain reaction-restriction fragment length polymorphism method. The A allele was decreased in AD patients (40.9%, p = 0.031) and increased in PsV patients (60.1%, p = 0.035) compared with controls (50.5%). This suggests that IL12B SNP is associated with susceptibility to AD and PsV, presumably by affecting the Th1/Th2 balance.     

GPR78与ETS1基因交互作用与系统性红斑狼疮的相关性研究

目的:明确GPR78和ETS1基因的交互作用对系统性红斑狼疮(SLE)发病的影响。方法:在前期GWAS的基础上,选择可能存在共同生物学效应的GPR78(SNP rs3103074)和ETS1(SNP rs6590330),在中国汉族人群4199例SLE和8255名对照中基因分型。通过logistic回归模式检验这两者之间可能存在的交互作用。结果:GPR78和ETS1基因在中国汉族人SLE发病中存在显著的交互作用(Pcombined=1.4×10~(-4),OR=1.27)。单个SNP与SLE的关联性分析发现GPR78(SNP rs3103074)是提示点(P=6.2×10~(-4),OR=1.22,95%CI:1.12~1.32),与SLE中度关联。结论:GPR78与ETS1基因之间存在着显著的交互作用,可能在SLE的发病中发挥作用。     

补体C1q基因簇rs631090多态性与女性系统性红斑狼疮的相关性研究

目的:确定补体C1q基因簇单核苷酸多态性(single nucleotide polymorphisms,SNPs)与中国女性人群系统性红斑狼疮(SLE)的易感性。方法:111例女性SLE患者及120名女性正常对照者。提取样本基因组DNA后,经普通PCR扩增目的基因,采用二代测序分析C1q基因簇上三个位点(rs631090、rs292001、rs294223)的基因型及等位基因分布。在不同的遗传模式下分析三个位点基因多态性与SLE的相关性。结果:位点rs631090(C1qB)病例组与对照组基因型频率和等位基因分布比较差异均具有统计学意义(P=0.034和P=0.008)。位点rs292001(C1qA)和rs294223(C1qB)的基因型频率及等位基因分布结果在两组间不具统计学差异(P值均大于0.05)。位点rs631090在显性遗传模型下CT/CC基因型在统计学上具有显著保护性作用(OR=0.470,95%CI=0.268-0.823,P0.05)。rs292001和rs294223在三种遗传模型下分析均未发现相关性(P值均大于0.05)。结论:在中国女性人群中rs631090位点SNPs与SLE相关,基因型CT/CC可能为女性SLE保护基因型。     

Genetic variants of the IL-23R pathway: association with psoriatic arthritis and psoriasis vulgaris, but no specific risk factor for arthritis

Variants in two genes of the IL-23 receptor (R) pathway have recently been shown to be associated with psoriasis vulgaris (PV). We were interested whether the risk conferred by these variants differs between psoriatic skin and joint disease. Four variants of the IL12B and IL23R genes were analyzed in 1,114 PV patients, 748 patients with psoriatic arthritis (PA) and 937 healthy controls before and after stratification for the major psoriasis risk allele at psoriasis susceptibility locus 1 (PSORS1). For both PA and PV, we detected the strongest association with two IL12B single-nucleotide polymorphisms and the corresponding haplotype as reflected by minimal P-values of 10(-7) and highest odds ratios of 1.50 (1.28-1.75) for rs6887695 in PA patients and 1.50 (1.27-1.76) for rs3212227 in the PV cohort, respectively. For IL23R, only rs11209026 showed an association. The results remained significant after correction for multiple testing. No difference was observed after stratification for the PSORS1 risk allele. While confirming recent reports on variants of the IL-23R pathway as susceptibility factors for PV, our study is the first to extend analysis of both genes to PA. However, our results indicate that these variants are not specific risk factors for arthritis, but relevant for susceptibility to psoriasis in general.