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缺氧诱导因子1基因多态性与HBV相关性肝炎、肝硬化、肝癌的遗传易感性研究

发布时间:2018-04-30 19:10

  本文选题:缺氧诱导因子 + 基因多态性 ; 参考:《广西医科大学》2014年硕士论文


【摘要】:目的:缺氧诱导因子(Hypoxia inducible factor-1,HIF-1)作为缺氧环境下诱导的主要的核转录激活因子,在机体应对缺氧的过程中发挥了重要作用。本实验主要通过对HIF-1α基因rs11549465和rs11549467两个位点基因多态性的研究,探讨在广西地区人群中HIF-1α的基因型在HBV相关性肝炎、肝硬化、肝癌人群中的分布,以及HIF-1α的基因多态性与HBV相关性肝炎、肝硬化、肝癌的遗传易感性的关系。 方法:筛选首次入院的HBV相关性肝脏疾病患者共442例作为病例组,其中包括153例慢性乙型肝炎患者(CHB组),132例乙型肝炎肝硬化患者(LC组),157例HBV相关性肝癌患者(HCC组),同时选取健康体检者173例作为对照组。应用聚合酶链反应-限制性片段长度多态性(PCR-RFLP)技术分别检测HIF-1α基因rs11549465、rs11549467两个位点的基因多态性,并利用DNA直接测序法验证与PCR-RFLP法检测结果的吻合度,计算其基因型和等位基因频率。采用拟和优度χ2检验对两个SNP位点进行哈-温平衡检测,并运用logistic回归分析校正性别、年龄等混杂因素,计算OR和95%CI,进而分析两个SNP位点基因多态性和HBV相关性肝炎、肝硬化、肝癌遗传易感性的关系。运用SHEsis软件分别对HIF-1α基因两个SNP位点进行单倍型分析。 结果: 1.对照组与CHB组、LC组、HCC组各组的性别构成比较差异无统计学意义(P0.05),然而各组在年龄构成比较时发现,对照组与LC组和HCC组年龄比较差异均有统计学意义(P 0.05),同时CHB组与LC组和HCC组年龄比较差异亦有统计学意义(P0.05),其余的两两比较则差异均无统计学意义(P0.05)。HIF-1αrs11549465和rs11549467两个SNP位点中,除rs11549465位点中的肝癌组(P0.05)外,其余组的基因型分布频率均符合哈-温平衡定律(P0.05)。 2. HIF-1αrs11549465位点发现CC、CT和TT三种基因型。将野生型CC基因型和等位基因C分别作为参照,通过logistic回归分析校正年龄和性别混杂因素后发现,CT基因型在CHB与HCC组比较中差异有统计学意义(P0.05),,其余组包括等位基因组比较差异均无统计学意义(P0.05)。此外在男性人群亦发现同样的结果。说明CHB可能与HCC患病有相关性。 3. HIF-1αrs11549467位点发现GG、GA和AA三种基因型。将野生型GG基因型和等位基因G分别作为参照,通过logistic回归分析校正年龄和性别混杂因素后发现,GA基因型和AA基因型与各组比较差异均无统计学意义,与等位基因A相比差异亦无统计学意义(P0.05)。 4.对性别进行分层分析后发现HIF-1α中rs11549465和rs11549467两个位点无论是在广西男性人群中,还是在广西女性人群中,其基因型和等位基因与CHB、LC以及HCC患病风险均未发现相关性。 5.将上述两个SNP位点进行单倍型构建,结果发现在对照组与HCC组构建的CA、CG单倍型中差异有统计学意义(P=0.025,OR=0.416;P=0.008,OR=2.327),在CHB组与HCC组构建的CG、TG单倍型中差异亦有统计学意义(P=0.007,OR=2.408;P=0.020,OR=0.315) 结论: 1. HIF-1rs11549465位点的CT基因型可能降低CHB发展为HCC的发病风险。而rs11549467位点的多态性与HBV相关性肝炎、肝硬化、肝癌的患病风险无关。 2. rs11549465和rs11549467两个位点构建的单倍型分析中发现CA单倍型可能降低HCC的患病风险,而CG单倍型可能增加HCC的患病风险。CG单倍型亦可增加由CHB发展为HCC的患病风险,而TG单倍型则可降低CHB发展为HCC的患病风险。
[Abstract]:Objective: Hypoxia inducible factor-1 (HIF-1), as a major nuclear activator in anoxic environment, plays an important role in the process of coping with hypoxia. This experiment is mainly based on the study of the two gene polymorphisms of the HIF-1 alpha gene rs11549465 and rs11549467, and the study of people in Guangxi region. The genotype of HIF-1 alpha in the group is distributed in HBV related hepatitis, cirrhosis, liver cancer, and the genetic polymorphisms of HIF-1 A and the genetic susceptibility to HBV related hepatitis, cirrhosis, and liver cancer.
Methods: 442 cases of HBV related liver disease were selected for the first time, including 153 patients with chronic hepatitis B (group CHB), 132 cases of hepatitis B cirrhosis (group LC), 157 patients with HBV related liver cancer (group HCC), and 173 healthy persons as the control group. The polymerase chain reaction restriction was used. The fragment length polymorphism (PCR-RFLP) technique was used to detect the gene polymorphism of the two loci of the HIF-1 alpha gene rs11549465 and rs11549467, and the DNA direct sequencing was used to verify the anastomosis with the results of the PCR-RFLP assay, and to calculate the genotype and allele frequency of the allele. Two SNP loci were detected by the pseudo sum chi 2 test. The logistic regression analysis was used to correct the sex, age and other confounding factors, calculate OR and 95%CI, and then analyze the relationship between the genetic polymorphisms of two SNP loci and the genetic susceptibility to hepatitis, cirrhosis and liver cancer associated with HBV. Using the SHEsis software, the haplotype analysis of the two SNP loci of the HIF-1 a gene was performed respectively.
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