毛发角蛋白的基因多态性在先天性念珠状发家系中的研究

目的 研究先天性念珠状发患者毛发角蛋白基因hHB1和hHB6多态现象。方法 提取患者及其家系成员外周血基因组DNA。采用聚合酶链反应扩增hHB1和hHB6基因的全部序列，PCR产物直接测序验证。结果 患者及其家庭成员在测序时发现hHB1基因第1外显子的第447位碱基表现为C，第52位的密码子表达为CGA-精氨酸。而与该家系无关的50人份测序中该住为-G〉C的杂舍峰，即在此位碱基既可是G也可是C，在GeneBank中氨基酸编码为GGA（甘氨酸）。提示为一单核苷酸多态性改变。结论 该研究在先天性念珠状发家系中发现了可引起编码氨基酸改变的单核苷酸多态性，证实了国外的报道。     

Mutation detection of type II hair cortex keratin gene KRT86 in a Chinese Han family with congenital monilethrix

Background Monilethrix is an autosomal dominant hair disorder characterized clinically by alopecia and follicular papules.In this study,we collected a Han monilethrix family to detect the mutations in ...     

A mutation in the type Ⅱ hair keratin KRT86 gene in a Han family with monilethrix

Monilethrix, a congenital disease of hair, is usually associated with mutations in keratin genes, like KRT81, KRT83 and KRT86. We conducted this study to investigate the mutation of type Ⅱ human basic hair keratin hHb/ KRT gene in a Han family with monilethrix and obtain information for potential pathogenic mechanism study of monilethrix. Peripheral blood samples were drawn for genomic DNA detection. Exon 1 and exon 7 of the KRT81, KRT83 and KRT86 genes were amplified by PCR. All PCR products were sequenced...     

常染色体显性视网膜色素变性家系基因定位

目的探讨一常染色体显性视网膜色素变性（autosomal dominant retinitis pigmentosa,adRP）家系致病基因与盘膜边缘蛋白/视网膜变性慢基因（eripherin/retinal degeneration slow,RDS）、视杆外节盘膜蛋白1基因（retinal outer segment membraneprotein 1,ROM1）、视锥杆细胞同源盒基因（cone-rod homeobox gene,CRX）、神经视网膜亮氨酸拉链基因（neural retinalleucine zipper,NRL）、鸟甘酸环化酶激活1B基因（guanylate cyclase activator 1B,GUCA1B）、肌动蛋白同源2基因（fascinhomolog 2,FSCN2）和拓扑异构酶结合1基因（topoisomerase I binding,TOPORS）多发突变位点的关系。方法采集一个连续4代发病的RP家系14个成员外周血4~5 ml,提取基因组DNA,采用聚合酶链反应（plymerase chain reaction,PCR）对常见的7个adRP候选基因的17个外显子多发突变位点进行扩增,PCR产物纯化后直接测序,测序结果与美国国立生物技术信息中心（National Center for Biotechnology Information,NCBI）数据库中公布的核酸标准序列进行比对分析。结果该家系视网膜色素变性为常染色体显性遗传,家系成员在RDS、ROM1、CRX、NRL、GUCA1B、FSCN2和TOPORS基因中未发现致病突变,仅在RDS基因第1外显子和第3外显子编码区发现5处单核苷酸改变。结论 RDS、ROM1、CRX、NRL、GUCA1B、FSCN2和TOPORS不是本研究家系的致病基因,RDS基因外显子中的5处单核苷酸的改变为单核苷酸多态性（single nucleotide polymorphism,SNP）。     

中国人群MEGSIN基因单核苷酸多态性的检测

【目的】研究中国人群MEGSIN基因多态性及其分布特征，并与国外数据库进行比较。【方法】随机选取208例广东地区汉族个体，提取基因组DNA。对包含外显子、外显子-内含子交界区及5’UTR区、3’UTR区的PCR产物进行直接测序。综合正反向结果识别和鉴定基因内SNPs。所得结果在美国国立生物技术信息中心（NCBI）的SNP数据库（dbSNP）中进行查询和比较。【结果】在所有研究对象中共发现24个SNPs，主要位于非编码区；22个为替换型SNP，1个为插入型SNT，另一个为缺失型SNP；其中有6个SNPs在数据库中未报道，有4个数据库已报道的SNPs，在本次研究未能证实在中国人群中存在多态性。【结论】中国汉族人群MEGSIN基因的多态性分布与美国数据库中基于高加索人群的资料存在差异。本研究不仅有利于了解MEGSIN基因结构，且为在中国人群中研究MEGSIN基因相关疾病并最终找到致病位点提供可靠数据。     

Schizophrenia susceptibility genes on chromosome 13q32

Schizophrenia is a complex mental disorder affecting approximately 1% of the general population worldwide. It has a high incidence in the general population, a poor prognosis and a poor outcome, in that it has become a major social problem. Family, twin, and adoption studies have clearly shown that a genetic component is quite likely to play an important role in determining     

Schizophrenia susceptibility genes on chromosome 13q32

Schizophrenia is a complex mental disorder affecting approximately 1% of the general population worldwide.1 It has a high incidence in the general population, a poor prognosis and a poor outcome, in that it has become a major social problem. Family, twin, and adoption studies have clearly shown that a genetic component is quite likely to play an important role in determining susceptibility to schizophrenia. The genome-wide scan indicates that several chromosomal regions are linked to schizophrenia, some of which have been replicated independently including 6p21-24, 8p21-22, 13q14-33 and 22q11-12.2,3 This study was designed to detect two single nucleotide polymorphisms (SNPs) located in the 13q14-33 region, rs188608 at the STK24 locus and rs2892679 at the GPC6 locus, among Chinese population.     

SNP与Car2、Gpi1基因多态性的关联性研究

[摘要] 目的 从单核苷酸多态性（single nucleotide polymorphism, SNP）水平探索小鼠生化标记基因Car2与Gpi1多态性的形成机理。方法 从DNA、cDNA和蛋白多肽3个方面分析研究Car2与Gpi1基因的多态性。结果 Car2基因DNA和cDNA中有3个SNP与Car2a/b多态性相关,分别为外显子2中的C（T）、G（C）和外显子7中的A（G）;蛋白多肽中发现第38位Gln/His与Car2a/b多态性相关,对应于外显子2中的G（C）。Gpi1基因DNA中没有发现与Gpi1a/b多态性相关的SNP;cDNA水平有2个SNP与Gpi1a/b多态性相关,分别为外显子9中的T(C)和18中的A(G);蛋白多肽中发现第247位Phe/Leu与Gpi1a/b多态性相关,对应于外显子9中的T(C)。结论 Gln/His（38）、Phe/Leu（247）间的转换可能分别是近交系小鼠形成Car2a/b,Gpi1a/b多态性的原因。     

新疆汉族乙醇依赖患者家庭暴力行为与谷氨酸受体6基因多态性关联分析

目的探讨谷氨酸受体-6(GluR6)基因rs6922753、rs2227283位点多态性与新疆汉族乙醇依赖患者家庭暴力行为之间的关系。方法 184例乙醇依赖患者按照有无家庭施暴分为施暴组104例和无施暴组80例,采用聚合酶链反应产物直接测序法检测2组患者GluR6基因rs6922753、rs2227283位点的多态性分布。应用SPSS 17.0软件分析基因多态性与暴力行为的相关性。结果在施暴组与无施暴组之间,rs6922753位点基因型频率分布差异有统计学意义(P=0.018),等位基因频率分布差异有统计学意义(P=0.007)。在施暴组与无施暴组之间,rs2227283位点基因型频率分布差异有统计学意义(P=0.023),等位基因频率分布差异有统计学意义(P=0.019)。与rs6922753 CC比较,rs6922753 TT使家庭暴力的发生风险升高了2.859倍。与rs6922753 CC+CT相比较,rs6922753 TT使家庭暴力的发生风险升高了2.116倍。与rs2227283 GG比较,rs2227283 AG使家庭暴力的发生风险升高了1.194倍。结论新疆汉族乙醇依赖患者家庭暴力行为可能与GluR6基因多态性具有关联性。     

椎间盘退变相关基因单核苷酸多态性的研究进展

椎间盘退变具有一定程度的遗传易感性,可能与人群中存在基因多态性有关。近年来,椎间盘退变与基因单核苷酸多态性的相关性研究逐渐增加并取得长足进展,目前研究的基因主要包括3类:(1)与椎间盘稳定性相关的基因,包括结构相关基因和代谢相关基因;(2)炎症相关基因;(3)疼痛信号通路相关基因。研究椎间盘退变相关基因单核苷酸多态性将有助于揭示椎间盘退变的遗传学机制,从而为个性化预防和治疗椎间盘退变疾病开辟新的道路。     

三种基因SNP与BAVM易感及出血风险的相关性研究

目的 探讨白细胞介素-17(IL-17A)、转化生长因子-β(TGF-β)及其受体(TGFRβ2)的单核苷酸多态性(SNP)与脑动静脉畸形(BAVM)易感及出血风险的相关性.方法 前瞻性收集BAVM患者外周血(n=53),健康对照人群来自体检中心(n=120).采用聚合酶链反应-限制性片段长度多态性(PCR-RFLP)法,检测IL-17A-197 G/A,TGFβ1-509 C/T及TGFRβ2-875 A/G基因的SNP特征,并做关联分析探讨以上基因SNP与BAVM易感及出血风险的相关性.结果 BAVM组与对照组比较,IL-17A-197 G/A和TGFβ1-509 C/T基因型及基因频率分布上的差异无统计学意义(P＞0.05),TGFRβ2-875 A/G基因型及基因频率分布差异有统计学意义(P＜0.05);BAVM出血组IL-17A-197G/A的G/G基因型和TGFRβ2-875 A/G的G基因频率明显高于未出血组(P＜0.05).结论 TGFRβ2-875 A/G的G/G基因型可能是中国南方人群易感BAVM的危险因素,IL-17A-197 G/A的G/G基因型可能与BAVM易破裂出血风险有关.     

Gln192Arg polymorphism in paraoxonase 1 gene is associated with Alzheimer disease in a Chinese Han ethnic population

Background Oxidative stress such as low-density lipoprotein （LDL） oxidation is thought to be an important mechanism in Alzheimer＇s disease （AD）. Paraoxonase 1 （PON1）, an enzyme located on high-density lipoprotein, can prevent LDL from oxidation to some extent. It is also a potent cholinesterase inhibitor and an arylesterase, combating organophosphate poisoning and metabolization of environmental neurotoxins which might be responsible for neurodegeneration with aging.We evaluated the association of Gln192Arg polymorphism in the PON1 gene with AD in a Chinese Han ethnic population. Methods Patients and age-matched controls were recruited from outpatient clinics and a population-based epidemiological survey, respectively. Gln192Arg polymorphism in the PON1 gene was detected by allele-specific PCR technique in 521 patients with AD and 578 healthy controls. Results The presence of at least one of PON1 R alleles （Q/R or R/R） was lower in AD patients than in the controls （82.7% vs 87.4%; χ^2 = 4.68, P = 0.03）. PON1 gene R allele frequency was lower in AD patients than in the controls （60.7% vs 64.7%; χ^2=3.85, P = 0.05）. One-way ANOVA showed that PON1 genotype had no effect on the age of onset for developing AD. Logistic regression analysis demonstrated the age and sex-adjusted odds ratio （OR） for the risk of AD in PON1 of PON1 R allele carriers was 0.71 （P = 0.044, 95%CI, 0.51 - 0.99）. Conclusion Our results indicate that Gln192Arg polymorphism in the PON1 gene is associated with AD, and PON1 R allele might be a protective factor for AD in a Chinese Han ethnic population.     

Association between SNP rs10569304 on the second expressed region of hole gene and the congenital heart disease

The correlation of single nucleotide polymorphism (SNP) rs10569304 on the second expressed region of hole gene and congenital heart disease (CHD) of human being, and the effect of hole gene on CHD were investigated. 179 patients with CHD as CHD group and 183 healthy people as control group were selected in the case-control study. DNA was abstracted from the peripheral blood by phenol-chloroform method. Primer was designed for the flanking sequence of SNP rs10569304 on the second expressed region of hole gen...     

Polymorphisms in XRCC5, XRCC6, XRCC7 genes are involved in DNA double-strand breaks(DSBs) repair associated with the risk of acute myeloid leukemia(AML) in Chinese population

Objective:To investigate the association between the X-ray repair cross complementing(XRCC) group 5, XRCC6 and XRCC7 polymorphisms and risk of acute myeloid leukemia(AML). Methods:This hospital-based case-control study included 120 AML patients and 210 cancer-free controls in a Chinese population. Three polymorphisms of XRCCS, XRCC6 and XRCC7 were genotyped using the polymerase chain reaction(PCR) or polymerase chain reaction-restriction fragment length polymorphism(PCR-RFLP) method. Results: We found that there was a significant decrease in risk of AML associated with the XRCC6-61 CG/GG genotype(adjusted odd ratio (OR)=0.55;95% confident interval(CI)=0.34-0.89) compared with the-61CC genotype. For the novel tandem repeat polymorphism (VNTR) in the XRCC5 promoter, we found when the XRCC5 six genotypes were dichotomized(i.e., 2R/2R, 2R/1R versus 2R/0R, 1R/1R, 1R/0R and 0R/0R), the latter group was associated with increased risk of AML(adjusted OR=1.67;95% CI=1.00-2.79) compared to 2R/ 2R+2R/1R genotype. However, the XRCC7 6721G>T polymorphism had no effect on risk of AML. Conclusion:The XRCC6-61C > G and XRCC5 2R/1R/0R polymorphisms, but not XRCC7 6721G > T polymorphism, could play an important role in the development of AML. Larger scale studies with more detailed data on environment exposure are needed to verify these findings.     

Mutation analysis in a Chinese family with multiple endocrine neoplasia type 1

Background Multiple endocrine neoplasia type 1 （MEN1） by germline mutations of the tumor suppressor gene MEN1. with MEN1. Methods A large Chinese family with MEN1 was collected MEN1 gene were amplified and sequenced. is an autosomal dominant cancer syndrome which is caused This study aimed to identify mutations in a Chinese pedigree All of the coded regions and their adjacent sequences of the Results In this family, a heterozygous cytosine insertion in exon 10 （c.1546_1547insC） inducing a frame shift mutation of MEN1 was found in the proband and the other two suffering members of his family. This mutation was linked to a novel single nucleotide polymorphism （SNP）in intron 3 （IVS3＋18C〉T）. Conclusions The mutation in exon 10 of MEN1 gene might induce development of parathyroid hyperplasia and pituitary adenoma and cosegregate with MEN1 syndrome. The significance of the new found IVS3＋18C〉T of MEN1 needs a further investigation.     

中国汉族人群2型糖尿病30个候选基因相关性分析

目的鉴定中国汉族人群2型糖尿病易感基因。方法对30个候选基因进行单核苷酸多态性(SNP)的发现、基因分型,并进行单倍型构建。对群体资料的SNP和单倍型数据进行病例-对照研究,并在77个trio家系中进行传递不平衡检验(TDT)。应用报告基因法对1个阳性SNP位点rs5210的基因表达调控作用进行分析。结果KCNJ11基因的几个SNP位点与中国汉族人群2型糖尿病相关,其中rs5219的等位基因频率,rs5210、rs2285676和rs5219的基因型频率,以及由rs5219和rs5215构成的单倍型GA的频率,在病例组和对照组间差异具有显著性(P<0·05),单倍型GA的TDT检验也具有统计学差异(P<0·05)。报告基因分析显示rs5210两个等位基因的基因表达调控作用差异具有显著性(P<0·05)。结论KCNJ11基因是中国汉族人群2型糖尿病易感基因之一。     

云南省精神分裂症患者关联基因检测

目的:采用简易微列阵法检测谷氨酸递质系统中与精神分裂症相关联的基因。方法:采用简易微阵列法,即PCR-等位基因特异性引物延伸和硝酸纤维素膜杂交法分析云南省255例精神分裂症患者和262名对照4个候选基因的4个SNP位点[rs778293(G72/G30)、rs2299225(GRM3)、rs11146020(GRIN1)和rs2814351(GRID1)]与精神分裂症的关联性。结果:对照组谷氨酸递质系统中的4个基因的4个SNP位点均符合Hardy-Weinberg遗传平衡定律。4个位点中,rs778293位点与精神分裂症存在关联性(基因型频率χ2=14.017,等位基因频率χ2=14.951,P<0.05)。结论:G72/G30基因SNP多态性与精神分裂症有关。     

Association of common polymorphisms in the LRP6 gene with sporadic coronary artery disease in a Chinese population

Background  Genetic factors contribute to the development of coronary artery disease (CAD). Recently, a missense mutation in the low density lipoprotein receptor related protein 6 (LRP6) gene, encoding low density lipoprotein receptor related protein 6, has been implicated in an autosomal dominant form of early-onset CAD. The aim of this study was to determine whether the common variants in LRP6 are associated with sporadic CAD in Chinese.

Methods  A total of 766 CAD patients and 806 healthy controls were included in this study. The presence of angiographic CAD was determined by coronary angiographic analysis. Six signal nucleotide polymorphisms (SNPs) were genotyped using the polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) technique.

Results  A significant association was detected between rs11054731 in LRP6 intron 2 and CAD in our cohort (P=0.001). The CC genotype and C allele frequency in the case group were 52% and 72%. Using a dominant model of inheritance, the C allele of rs11054731 was shown to be an independent risk factor for CAD with an OR of 1.45 (95% CI: 1.19–1.77, P=0.0002). With the stratification according to the number of affected coronary arteries, an association was observed between rs11054731 and CAD (P=0.0002). No significant association was observed between any other SNPs and the risk of CAD.

Conclusion  The C allele of the rs11054731 within the LRP6 gene was associated with increased risk and extent of CAD in Chinese.

     

ABCB1基因位点G2677T／A单核苷酸多态性与氯吡格雷抵抗的相关性研究

目的研究ABCB1基因单核苷酸多态位点G2677T／A在中国汉族人群中的分布及其与氯吡格雷抵抗（elopidogrelresistance,cR）的相关性。方法患者人选后均给予氯吡格雷600mg和阿司匹林300mg负荷量治疗,并在服药前和服药后24h分别测定5vmol／L腺苷二磷酸诱导的血小板聚集率（PAR）,根据2次测定结果计算PAR变化值,PAR变化值小于或等于10％者定义为CR。采用焦磷酸测序法测定ABCB1基因G2677T／A单核苷酸多态位点在CR组和NCR组的基因型及等位基因分布频率。结果ABCB1基因G2677T／A多态性在CR组和NCR组基因型分布频率符合HaZy—Weinberg平衡。在CR组和NCR组中,ABCB1基因G2677T／A基因型频率分布差异无统计学意义（P〉0．05）;两组G、T、A等位基因的分布频率差异也无统计学意义（P〉0．05,OR=0．81—1．31,95％C／=0．38—4．2）。结论ABCB1基因单核苷酸多态位点G2677T／A与冠心病患者CR的发生无相关关系。     

应用单核苷酸多态性技术筛查2型糖尿病易感基因

目的利用单核苷酸多态性(SNP)标记,在中国北方汉族2型糖尿病相关基因定位区域(1p36.33-p36.23、1q24.3-25.1及1q42.12-42.13)内寻找疾病易感基因位点以及与疾病相关的单倍型.方法通过公共SNP数据库和对样本库全基因测序寻找SNP位点的途径,在定位区域内选择了33个候选基因中的124个SNP位点,用测序法对236例北方汉族散发2型糖尿病患者及152例正常对照个体进行SNP基因分型及病例-对照关联分析,并对具显著性差异的SNP位点进行单倍型分析.结果124个SNP位点中有4个SNP位点的分布频率在病例组和正常对照组存在显著差异(P＜0.05),分别为sAC基因中的rs203849(P=0.005,OR=1.60)和rs203826(P=0.016,OR=1.60),PANK4基因中的rs7535528(P=0.028,OR=1.45)和CASP9基因中的rs884363(P=0.043,OR=1.37).在这4个SNP位点构成的组合型中发现,有2种组合型的频率分布在病例组与对照组之间差异有显著性(P＜0.001).此外,对sAC基因的单倍型分析发现,有4种单倍型与疾病发生相关.结论sAC、PANK4和CASP9基因为中国北方汉族人群2型糖尿病候选易感基因,这3个基因可能在2型糖尿病易感性上有协同作用.