高血壓表觀遺傳學(xué)調(diào)控機(jī)制研究及高血壓并發(fā)癥—腦卒中的遺傳危險(xiǎn)因素研究
[Abstract]:Objective:Cardiovascular and cerebrovascular diseases are one of the most important threats to human health.Hypertension is the most important risk factor of cardiovascular and cerebrovascular diseases and has become a heavy social burden in China.Therefore,the occurrence,development and prognosis of hypertension are still the key to the prevention and treatment of hypertension.Studies have shown that hypertension is an interaction of genetic and environmental factors. Complex diseases. Candidate gene strategies and all susceptibility loci obtained from genome-wide association studies have not shown a strong association with hypertension. The etiology of hypertension remains uncertain. In recent years, epigenetic studies of hypertension have found clues that may be able to communicate environmental factors with the nuclear genome. DNA methylation is one of the four important ways of epigenetic regulation. However, in the field of hypertension, DNA methylation research has many problems to be solved urgently. The first part of this paper compares the differences of DNA methylation profiles in peripheral blood at the whole genome level between the extreme hypertension and the perfect control group, between the untransformed and untransformed pre-hypertension groups, and finds two possible sites of DNA methylation differences associated with the pathogenesis of hypertension from their intersection. At the same time, the effect of DNA methylation modification on phenotype was preliminarily explored by selecting GWAS positive sites associated with hypertension in Chinese population.
METHODS: Forty-four perfect controls, 44 patients with extreme hypertension and 44 patients with pre-hypertension were selected from Rizhao community in Shandong Province. DNA methylation status in peripheral blood of all individuals was detected by Illumina 450K Bead Chip methylation chip. Pyrophosphate sequencing technique was used to repeat the results of the first population chip, and then the enlarged 70 cases were perfect. Positive CpG methylation sites were identified in 133 hypertensive patients and controls. OVGP1 gene associated with hypertension was identified by two-stage screening. Plasma levels of OVGP1 protein were detected by ELISA. Real-time fluorescence quantitative PCR, Western-blot and immunofluorescence assays were used to detect the expression of OVGP1 in endothelial cells. The ull-down assay captured the protein interacting with OVGP1 and transfected HUVEC and THP1 cells with lentiviruses to overexpress OVGP1 and detect the changes of mRNA levels of hypertension-related molecules. The relationship between epigenetics, genetic variation and phenotype was analyzed.
Results: A total of 14 methylation sites were found in perfect control and hypertensive patients during the whole genome DNA methylation screening stage, and there were significant differences between the untransformed and untransformed pre-hypertension patients, and the trend of methylation increased or decreased was the same. The methylation levels at Cg20823859 and Cg17600943 loci were significantly lower in hypertensive patients, with mean methylation differences of - 0.11 and - 0.10, respectively. Age, sex and BMI were adjusted for significant differences (P = 0.02 and P = 0.001). The plasma level of OVGP1 protein was also significantly higher in hypertensive patients than in the control group. The results showed that OVGP1 was expressed in the cytoplasm of HUVEC, and 25 proteins possibly interacting with OVGP1 were captured by pull-down. Four of these proteins were significantly correlated with the pathological process of hypertension.
The results of genotyping showed that the distribution frequency of the known susceptibility locus rs1842896 in 88 hypertensive patients and controls was significantly different (P 0.05). In individuals with TT genotype, the methylation level of cg21176026 locus in patients with extreme hypertension was also significantly lower than that of the perfect control (P 0.05), and the TG + GG genotype was significantly lower than that of the control (P 0.05). There was no significant difference between the two groups (P = 0.39). Further, we found that when DNA methylation level beta = 0.75 was the critical point, TT genotype carriers were more likely to develop hypertension accompanied by hypomethylation, suggesting that methylation modification at cg21176026 site could affect the role of the risk allele rs1842896-T for hypertension.
CONCLUSION: The genome-wide methylation strategy was used to preliminarily demonstrate that epigenetic regulation may be involved in the development of hypertension, and two novel target genes, OVGP1 and CPO, were identified. The relationship between genetic variation, epigenetic modification and hypertension was explored, and possible interactions were inferred. However, further research is needed on the molecular mechanism.
Objective: Uric acid is the end product of purine metabolism. Excessive intake of food rich in purine and fructose has become an important cause of increased uric acid levels and subsequent hyperuricemia. Hyperuricemia is considered to be an important risk factor for hypertension, heart disease, kidney disease and stroke in addition to gout. High levels often precede hypertension, suggesting that uric acid, as an independent endogenous environmental factor, is directly involved in the pathophysiological process leading to hypertension.
Methods: 12 hyperuricemia patients, 44 perfect controls and 44 hypertensive patients were selected from Rizhao community of Shandong Province. DNA methylation status of all peripheral blood samples was detected by Illumina 450K Bead Chip methylation chip. DNA related to hyperuricemia was first searched from the DNA of hyperuricemia patients and perfect control peripheral blood samples. The methylation difference sites were further intersected with the DNA methylation difference sites between extreme hypertension and perfect control to obtain seven sites with the same changes in DNA methylation in both groups.
Results: Seven different DNA methylation sites were identified, including Cg15711973, Cg23812489, Cg02157463 and Cg23947654, which may be involved in the pathogenesis of hyperuricemia and hypertension. The levels of DNA methylation were decreased in both hyperuricemia and hypertensive patients, and increased in eg12252547, cg06827234 and cg16051083. In vitro experiments showed that uric acid stimulation significantly increased the expression of FLG2 mRNA in THP1 and Jurkat immune cells. This was consistent with the decrease of methylation level at CpG site cg23812489 in TSS1500 region upstream of FLG2 on the methylation chip. The cg12252547 site in the promoter region of MAL2 was found in the case group. The level of methylation was higher than that of the control group. Under uric acid stimulation in vitro, the level of MAL2 mRNA in THP1 cells decreased, but the level of MAL2 expression in Jurkat cells did not change significantly. However, we did not detect any changes in the expression levels of other candidate genes (TANC1, PCDHA, ZDHHC14).
CONCLUSION: Six candidate genes were identified by genome-wide DNA methylation differential site screening strategy. These genes are mostly related to calcium ion-related pathways and neural signal transduction, suggesting that elevated uric acid may alter the DNA methylation of these genes in the genome. Degree of regulation, gene expression level, and then participate in the pathogenesis of hypertension induced by hyperuricemia.
The first part of this paper studies the epigenetic regulation mechanism in the development of hypertension. In this part, we will explore the genetic risk factors of stroke, one of the most important complications of hypertension. Hereditary factors play a more dominant role in the etiology of intracranial aneurysms, so this part will study the genetic risk factors of hypertension complications with intracranial aneurysms as a model.
Several genome-wide association studies (GWAS) have been performed in European populations, but so far no GWAS studies have been carried out in Chinese Han population. To verify the new findings of the GWAS association study for intracranial aneurysms in Europe This study investigated the association of 10 single nucleotide polymorphism (SNP) loci with intracranial aneurysms in a large sample of Chinese Han population.
A total of 649 Chinese Han sporadic intracranial aneurysms and 1682 normal subjects were selected for genotyping of 10 candidate susceptibility sites reported in the GWAS study using Sequenom Mass Array. The results showed that the frequencies of rs12413409-G and rs1980781-C alleles were significantly different between the case group and the control group (both P = 0.002), and the risk of intracranial aneurysms was increased by 1.27 and 1.26 times respectively, reaching the Bonferroni-calibrated test level. There was a significant association (OR = 1.27, 95% CI 1.09-1.48, P = 0.002 and OR = 1.26, 95% CI 1.09-1.45, P = 0.002, respectively). Further stratification of ruptured and unruptured aneurysms by age and number of aneurysms revealed an increased association between these two susceptibility loci and intracranial aneurysms in individuals younger than 60 years of age. In the analysis, rs12413409 and rs1980781 increased the risk of rupture of intracranial aneurysms by 1.25 and 1.24 times respectively (P 0.005). Individuals carrying rs12413409-G and rs1980781-C were also more likely to develop single intracranial aneurysms. The other eight susceptibility genes reported in the previous GWAS study did not show intracranial motility in Chinese Han population. Aneurysms are associated.
This study confirmed two susceptibility loci, rs12413409 and rs1980781, obtained from the GWAS study in European populations, suggesting that they may be one of the genetic risk factors for intracranial aneurysms in Chinese Han population.
【學(xué)位授予單位】:北京協(xié)和醫(yī)學(xué)院
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2014
【分類(lèi)號(hào)】:R743.2
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