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《现代临床医学生物工程学杂志》2004,10(1):83-83
连锁分析方法的发现给基因研究带来巨大进展 .任何易感基因的探测都应被已知基因组学图谱的基因标记 .研究人员必须建立一张包含有数百对作为标记物基因的基因图谱 .在随后发现的更精确的标记物包括Alps(限制断片长度多态性 ) ,Vntrs(变数串联重复体 )和最近发现的Snps(单核苷酸多态性 ) .将来 ,更多数量更有价值的基因标记物在不断发现 .同时 ,遗传流行病学已发展新的更有效的统计学方法和生物信息处理工具来分析基因数据 ,这些先进的研究方法的高效率在以往是不能想像的 .这能让我们从有限的研究对象中得到更多的有用数据 .将来 ,可望基… 相似文献
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单核甘酸多态性(SNP)被称为第三代遗传标记,具有很多研究方法。单核甘酸多态性作为遗传标记在人类肿瘤、糖尿病等多基因病的研究中取得了一定的进展。本文综述了与胃癌相关的酶基因、细胞增殖相关基因、癌基因和抑癌基因、粘附分子基因和细胞因子基因的单核苷酸多态性,以分析不同基因型与胃癌的相关性。 相似文献
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大肠癌遗传易感性与单核苷酸多态性(SNP)的关系是近年来研究的热点。研究发现COX2,MTHFR等代谢相关基因的某些SNP与大肠癌的发病风险相关,其中携带COX2 9850G-10335A单倍型的个体可显著增加患大肠癌的风险。MMP家族是调控大肠癌侵袭转移的重要基因,MMP7-181G等位型频率可显著增加大肠癌淋巴结转移风险。进一步寻找大肠癌特异性SNP,对筛选大肠癌高危人群,预估发病风险,具有重要意义。 相似文献
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单核苷酸多态性的研究进展 总被引:38,自引:1,他引:38
单核苷酸多态性已成为一类新的遗传标记,广泛应用于基因定位、克隆和遗传多样性研究。本综合介绍了单核苷酸多态性标记在遗传特性、基因作图、分析技术、存在的问题及应用前景等方面的研究进展。 相似文献
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单核苷酸多态性(SNPs)是新一代的基因分子标记,随着人类基因组图谱的绘制成功,SNPs被应用于寻找各种致病基因。类风湿关节炎(RA)是一种全身自身免疫性疾病,到目前为止,其发病机制尚未完全清楚。本文简要介绍了SNPs及几种基因的SNPs与RA的关系。 相似文献
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miRNA是隶属于非编码RNA家族并可在转录后水平调控基因表达的一类重要分子,在肿瘤发生中起重要作用.单核苷酸多态性(single nucleotide polymorphism,SNP)是基因组上单个核苷酸的变异,是形成肿瘤易感性的重要原因之一.近年来研究发现,非编码miRNA基因也存在SNP并与肿瘤有关联,该文就此研究进展做一简要综述. 相似文献
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单核苷酸多态性的研究进展 总被引:6,自引:0,他引:6
单核苷酸多态性 (SNPs)是指存在于某一人群或个体基因组内的单个碱基发生突变 ,正是由于这些突变 ,导致了群体与群体及个体与个体之间的差异。许多疾病的易感性、个体的药物敏感性等均与SNPs有关。建立快速高效的SNPs检测方法和强大的数据库 ,能为人类基因组功能研究和SNPs的应用研究提供坚实的基础。 相似文献
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目的:探讨白介素-23受体(IL-23R)基因多态性与广西壮族人群乙肝相关肝细胞癌(HCC)易感性的关系。方法:采用聚合酶链反应-限制性片段长度多态性(PCR-RFLP)对84例乙肝表面抗原(HBSAg)阳性HCC患者(病例组)和94例HbsAg阳性体检者(对照组)IL-23R基因rs10889677、rs1884444、rs114658173个位点的单核苷酸多态性进行检测及其部分标本进行直接测序鉴定。采用SHEsis软件构建IL-23R基因3个位点的单体型。Logistic回归分析IL-23R基因多态性和单体型与HCC遗传易感性的关系。结果:IL-23Rrs10889677、rs11465817位点的AA、AC、CC3种基因型和A、C两种等位基因在HCC组与对照组之间的分布差异无统计学意义(P>0.05)。rs1884444位点的TT、TG、GG三种基因型及T、G两种等位基因在病例组和对照组的频率分布差异均有统计学意义(P均<0.05),Logistic回归分析发现携带TG基因型的个体发生HCC的风险较携带TT基因型的个体增加(校正OR=2.20,95%CI=1.11~4.37)。单体型构建发现CGC、AGC、CTC、ATC、CGA、AGA、CTA、ATA等8种单倍体,病例组和对照组的AGC单倍体分布差异有统计学意义(P<0.05),AGC单倍体携带者发生HCC的风险明显增加(校正OR=2.71,95%CI=1.06~6.93)。结论:IL-23R基因rs1884444位点TG基因型可能是HCC发病的危险因子;乙肝背景下AGC单倍体携带者患HCC的风险增加2.71倍,可能是乙肝相关肝癌发病的危险因素。 相似文献
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Jiang Q Shi D Nakajima M Dai J Wei J Malizos KN Qin J Miyamoto Y Kamatani N Liu B Tsezou A Nakamura T Ikegawa S 《Journal of human genetics》2008,53(1):42-47
A genetic association of knee osteoarthritis (OA) and a C/T transition single nucleotide polymorphism (SNP) (rs912428) located
in intron 1 of the LRCH1 gene has recently been reported in European Caucasians; however, the results are inconsistent. Our objective was to evaluate
the association in different knee OA populations. Three case-control association studies were conducted in Han Chinese, Japanese,
and Greek Caucasian populations. The LRCH1 SNP was genotyped in patients who had primary symptomatic knee OA with radiographic confirmation and in matched controls,
and the association was examined. We performed a meta-analysis for the studies together with results of two previous papers
using the DerSimonian–Laird procedure and calculated the power of the pooled studies by the software R. A total of 1,145 OA
patients and 1,266 controls were genotyped. No significant difference was detected in genotype or allele frequencies between
knee OA and control groups in the three populations (all P > 0.05). Association was not observed even after stratification by gender and Kellgren/Lawrence (K/L) scores. Meta-analysis
also supported the lack of association between LRCH1 and knee OA. The strong heterogeneity between original and replication studies was detected in Caucasian populations. However,
a tendency for the increase of TT genotype was observed in the European populations (OR = 1.46, P = 0.06). The powers for European and Asian replication studies were less than 0.8. Our results suggest that there is no association
between LRCH1 and knee OA. However, lack of association should be concluded by further replication studies.
Qing Jiang and Dongquan Shi contributed equally to this work. 相似文献
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目的 探讨中国西南地区汉族人群染色体12q24.31 rs2259816基因多态性与冠状动脉粥样硬化性心脏病(简称冠心病)的相关性.方法 收集592例经冠状动脉造影确诊的冠心病患者及同期冠状动脉造影阴性、排除冠心病诊断的463名正常对照,采用聚合酶链反应-限制性片段长度多态性(PCR-restriction fragment length polymorphism,PCR-RFLP)技术分析染色体12q24.31 rs2259816单核苷酸多态性,比较两组间rs2259816位点等位基因和基因型频率分布差异.结果 冠心病组与对照组中均检出AA、AC、CC基因型.rs2259816等位基因A在冠心病组的频率为49.5%,高于对照组的频率43.8%,两组差异有统计学意义(OR=1.129,95%CI:1.029~1.239,P=0.010).结论 中国西南地区汉族人群染色体12q24.31 rs2259816基因多态性与冠心病发生风险密切相关. 相似文献
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DNA甲基化是表观遗传修饰的重要部分,基因异常甲基化在肿瘤发生、发展中扮演重要角色.众多研究结果表明单核苷酸多态性(single nucleotide polymorphism,SNP)与DNA甲基化之间存在密切联系,可能通过改变甲基化位点或对DNA甲基化相关酶类产生影响,继而影响到相关基因的甲基化状态,改变表达水平,... 相似文献
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目的对FKBP6基因第3、4外显子进行突变和多态性筛查,研究第3外显子278C/A位点及第2内含子C/T位点(rs7797242)在无精症患者和正常男性中的多态性,初步探讨与原发无精症的相关性。方法采用变性高效液相色谱和聚合酶链反应-限制性片段长度多态性方法,对第3、4外显子进行突变和多态性筛查,对177例无精症患者和231名正常男性的278C/A和C/T(rs7797242)多态性进行基因分型。结果278C和278A等位基因频率符合Hardy-Weinberg平衡。无精症患者278A显著低于正常对照,差异有统计学意义(P<0.05)。C/T多态性在两组中均未检出,第3、4外显子未筛查到新的变异。结论278A等位基因可能与原发无精症相关。C/T(rs7797242)及370G/A,430G/C,467T/C,468G/A在中国人群中非常罕见。 相似文献
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年龄相关性黄斑变性(AMD)是发达国家老年人致盲的首要疾病.遗传因素在AMD的发生、发展中起重要作用.近几年研究发现,一些单核甘酸多态性(SNP)与AMD的发病明显相关.因而对补体因子H(CFH)基因,补体因子B(CFB)基因,补体因子2(C2)基因,补体因子3(C3)基因,CX3C趋化因子受体1(CX3CR1)基因,三磷酸腺苷结合盒转运体基因亚家族A第4成员(ABCA4)在AMD形成过程中的研究具有重要意义. 相似文献
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单核苷酸多态性与连锁不平衡研究进展 总被引:5,自引:0,他引:5
单核苷酸多态性(single nucleotide polymorphism,SNP)是人类基因组中最广泛的多态性现象,也是造成个体差异的最主要的遗传原因,发现和研究SNP的工作在目前人类基因组研究中倍受关注。连锁不平衡是不同遗传标记问存在着的非随机组合现象,SNP作为极具优势的遗传标记为深入研究连锁不平衡、以及利用连锁不平衡进行群体遗传学的参数估计、基因精细定位、关联分析等提供了良好的先决条件。最近,在SNP研究及连锁不平衡的度量和连锁不平衡性质的研究方面取得的一系列进展为遗传学在将来发展奠定了基础。 相似文献
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Tianhua Liu Hongman Huang Xinbing Liu Yuya Yang Xiang Mei Liuliu Feng 《International journal of clinical and experimental pathology》2020,13(11):2831
Objective: To explore the effect of PITX2 gene rs6843082 single nucleotide polymorphism on the efficacy and adverse reactions of warfarin in patients with atrial fibrillation and hypertension, and to provide a theoretical basis for individualized warfarin treatment. Methods: Data on 97 patients with atrial fibrillation and hypertension treated in our hospital were collected from September, 2018 to December, 2019. PCR and SNP genotyping techniques were used to measure the genotype at the rs6843082 locus (pituitary homeobox 2, PITX2) using DNA from the peripheral blood cells of all patients. We compared the efficacy of warfarin and the incidence of adverse reactions in patients of different genotypes. Results: (1) Among 97 subjects, 58 cases (59.79%), 32 cases (32.99%) and 7 cases (7.22%) of PITX2 (rs6843082) genotypes GG, GA and AA were identified respectively. The G and A allele frequencies were 76.29% and 23.71%, respectively. (2) After all patients took warfarin to achieve the standard, the GA group and AA group’s time to achieve the standard was significantly longer than that of the GG group (P<0.05). The difference was not statistically significant among groups (P>0.05). Compared with the GG group, the maintenance dose of the AA group was increased (P<0.05). (3) Compared with the GG and the GA group, the probability of bleeding events was higher in the AA group (P<0.05). (4) There was no difference in left ventricular end diastolic volume (LVEDV) and left ventricular end systolic volume (LVESV) group among GG, GA and AA groups (P>0.05). Compared with the GG group, left ventricular ejection fraction (LVEF) of the AA group was significantly reduced (P<0.05). (5) The mortality rates of the GG, GA, and AA groups were 15.51%, 12.50% and 22.57%, respectively, at the end of 120 d follow-up. Conclusion: Our findings show that rs6843082 SNP leads to the warfarin dose response differences that were observed in patients with atrial fibrillation and hypertension. Genotyping patients for rs6843082 before initiating warfarin treatment may optimize the treatment response and reduce bleeding incidence. 相似文献
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TLR4基因多态性在中国人群中的初步研究 总被引:4,自引:0,他引:4
目的检测中国人Toll样受体4(Toll—like receptor 4.TLR4)基因调控区和编码区的单核苷酸多态性(single nucleotide polymorphisms,SNPs).寻找TLR4基因的遗传标记。方法采用直接测序的方法检测基因的5′区、编码区、部分内含子区和3′区,以确定中国人群中TLR4基因SNP的位置和类型,并用聚合酶链反应-限制性片段长度多态性对重庆汉族样本进行了抽样调查。结果在4.98kb的测序范围内,发现5个新的SNP,3个位于5′区.2个位于3′非翻译区。在重庆地区汉族样本中.两个高频分布SNP的等位基因频率分别是0.266和0.404。结论在TLR4基因新发现的两个高频多态性位点在我国人群中比较常见,可以作为关联分析的遗传标记。 相似文献
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