醛固酮合酶基因多态性与老年原发性高血压的关系

目的探讨醛固酮合酶(CYP11B2)基因-344C/T多态性与老年原发性高血压(EH)的相关性。方法以人群为基础进行老年人EH病例-对照研究,应用PCR-RELP技术对289例武汉地区汉族老年人的CYP11B2基因-344C/T多态性进行分析。结果武汉地区汉族老年人群CYP11B2基因-344C/T多态性以TT和CT为主要基因型,C等位基因较少见。CYP11B2基因-344C/T多态性与老年人EH有相关性(P0.05)。结论武汉地区汉族老年人群CYP11B2基因-344C/T多态性与EH存在相关性,老年高血压人群携带CC+CT基因型频率较高。     

原发性高血压患者醛固酮合酶基因-344C/T多态性与血浆醛固酮浓度的关系

目的探讨汉族原发性高血压人群醛固酮合酶(CYP11B2)基因-344C/T多态性频率分布特点及其与血浆醛固酮浓度的关系。方法应用PCR-RELP技术对103例原发性高血压患者的CYP11B2基因-344C/T多态性进行分析。结果汉族原发性高血压人群CYP11B2基因-344C/T多态性以TT和CT为主要基因型,C等位基因较少见。与携带TT基因型的高血压患者比较,CT CC基因型携带者的血浆醛固酮浓度明显增高(148．52±55．63 ng/ml vs 122．85±38．22 ng/ml,P=0．015)。结论汉族原发性高血压人群CYP11B2基因-344C/T多态性与血浆醛固酮浓度有关。     

家族性原发性高血压与醛固酮合成酶基因多态性相关性研究

目的:探讨家族性原发性高血压与醛固酮合成酶(CYP11B2)基因-344T/C多态性的相关性及该基因-344T/C多态性频率分布特点。方法:以家系为基础进行原发性高血压家系—血压正常家系对照研究。原发性高血压家系(高血压家系组)34个,142例受试者;正常血压家系(正常血压家系组)31个,134例受试者。采用多聚酶链反应—酶切(PCR-RELP)技术,分析醛固酮合成酶基因多态性。基因型和等位基因频率用基因计数法。应用SPSS10.0统计软件,采用t检验或χ2检验进行分析。结果:高血压家系组的TT、CT基因型明显多于正常血压家系,两组比较,有极显著性差异(P<0.01);各代分别比较,均有极显著性差异(P<0.01)。在高血压家系组各代T等位基因发生频率与正常血压家系比较,有极显著性差异(P<0.01)。结论:家族性原发性高血压与醛固酮合成酶基因-344T/C多态性之间具有相关性。T等位基因频率增高,是原发性高血压患者家族中醛固酮合成酶基因-344T/C多态性分布特点,可能是家族性原发性高血压遗传的一个标志。     

醛固酮合成酶(CYP11B2)基因T(-344)C多态性与高血压病相关性研究

目的本研究探讨醛固酮合成酶基因(CYP11B2)基因T(-344)C多态性与原发性高血压之间关系.方法选取吉林省原发性高血压患者107例,其中男64例,女43例.正常人127例,其中男73例,女54例.排除高血压病及其它器质性疾病.所有研究对象用常规方法提取白细胞DNA.采用多聚酶链反应结合限制性内切酶(Hae Ⅲ)方法检测CYP11B2基因T(-344)C多态性.结果共扩增成功122例正常人和101例高血压患者DNA标本.原发性高血压组和正常对照组CYP11B2基因T(-344)C多态性基因型TT、CT、CC分布分别为6、28、67和5、59、58,其中C、T等位基因频率在两组分别为0.20、0.80和0.28、0.72.原发性高血压组TT基因型,T等位基因频率显著高于正常对照组,CT基因型,C等位基因频率显著低于正常对照组(P<0.05).结论本研究提示醛固酮合成酶基因(CYP11B2)基因T(-344)C多态性与中国人原发性高血压有关,可能是中国人原发性高血压的一个遗传标志.     

新疆哈萨克族隔离群醛因合成酶基因CYP11B2T(-344)C多态性与高血压的关联性研究

目的探讨哈萨克族人群醛固酮合成酶基因CYP11B2T(-344)C多态性与原发性高血压关联性.方法应用聚合酶链反应、限制性内切酶方法检测了新疆巴里坤县186例哈萨克族原发性高血压患者和168例正常人群CYP11B2基因T(-344)C多态性.结果哈萨克族正常人群及高血压患者的CYP11B2基因T(-344)C多态CC、Ct、TT基因型频率分别为0.12,0.61 0.27,和0.20,0.50,0.30,C和T等位基因分布频率分别为0.43,0.57和0.45,0.55,符合Hardy-Weinberg平衡.群体相关分析结果表明CYP11B2基因的C及T等位基因分布在高血压病组及正常人群差异无显著性(x2=4.838,P=0.89).然而女性高血压组CC基因型频率(0.24)较正常人群(0.12)高(x2=6.104,P＜0.05)结论CYP11B2基因T(-344)C多态性可能与新疆巴里坤哈萨克族女性高血压有关.     

CYP11B2及APOA5基因多态性与原发性高血压的相关性研究

目的:探讨湖南地区原发性高血压患者醛固酮合成酶基因CYP11B2-344C/T及载脂蛋白A5APOA5-1131C/T基因多态性频率分布情况,并分析CYP11B2-344C/T及APOA5-1131C/T多态性与原发性高血压发病风险的关系。方法:185例原发性高血压患者为原发性高血压组,另选取180例正常体检者为对照组,采用限制性片段长度多态性聚合酶链反应(PCR-RFLP)测定两组CYP11B2及APOA5基因多态性。结果:原发性高血压组CC、CT基因型显著高于对照组,C等位基因频率高于对照组(P0.05)。结论:CYP11B2基因及APOA5基因在原发性高血压患者中呈多态性分布,两者可能为原发性高血压的候选基因。     

武汉地区汉族人群醛固酮合酶基因多态性与原发性高血压的关系

目的 :探讨武汉地区汉族人群醛固酮合酶 (CYP11B2 )基因 344C/T多态性频率分布特点及其与原发性高血压 (EH)的关系。方法 :以人群为基础进行EH病例 对照研究 ,应用PCR RELP技术对 2 11例武汉地区汉族人的CYP11B2基因 344C/T多态性进行分析。结果 :武汉地区汉族人群CYP11B2基因 344C/T多态性以TT和CT为主要基因型 ,C等位基因较少见 ,其频率为 2 4 % ,明显低于文献报道的欧洲白种人 (P <0 .0 1) ,亦低于日本人 (P <0 .0 5 )。CYP11B2基因 344C/T多态性与EH无明显相关性 (P >0 .0 5 )。结论 :武汉地区汉族人群CYP11B2基因 344C/T多态性频率分布有着与欧洲白种人以及日本人不同的特点 ,且它与EH没有明显的相关性     

醛固酮合酶基因多态性与高血压患者血压及RAAS激素水平的相关性研究

目的探讨醛固酮合酶(CYP11B2)基因-344C/T多态性与高血压患者血压及肾素-血管紧张素-醛固酮系统(RAAS)激素水平的相关性。方法用放射免疫法检测171例原发性高血压患者(92例男性,79女性)RAAS激素水平,包括血浆肾素活性(PRA)、血浆血管紧张素II(AT-II)和醛固酮(ALD)水平。用聚合酶链反应(PCR)和限制性酶切方法检测所有患者的CYP11B2基因-344C/T多态性,按CC、CT和TT三种基因型分组。分析其与高血压患者血压及RAAS激素水平的相关性。结果 CYP11B2基因-344C/T多态性与高血压患者血压及血浆PRA和AT-II水平无关,但与血浆ALD水平相关,TT和CT基因型者的血浆ALD水平要高于CC基因型者,其差异有统计学意义(0.66±0.36or0.61±0.35versus0.42±0.23nmol/L,P=0.036)。结论本研究显示,高血压患者的CYP11B2基因-344C/T多态性与血浆ALD水平相关,提示该多态性可能参与了高血压患者血浆ALD水平的调节。     

原发性高血压伴肥胖患者血浆RAAS激素水平和CYP11B2－344C/T基因多态性的相关性

目的 通过检测原发性高血压伴肥胖患者血浆肾素-血管紧张素-醛固酮系统（RAAS）激素水平和醛固酮合成酶CYP11B2－344C/T基因多态性,探讨原发性高血压伴肥胖患者CYP11B2－344C/T易患基因型以及基因多态性与RAAS的关系。方法 随机选取1～2级原发性高血压患者60例,其中高血压伴肥胖者30例,单纯高血压者30例;同期体检中心体检者60例,其中单纯肥胖者30例,健康者30例。采用PCR-RFLP和琼脂糖凝胶电泳等方法检测CYP11B2－344C/T基因多态性,用放射免疫法检测血浆RAAS水平。结果 TT基因型例数与TC+CC基因型例数进行多重比较,有显著差异（P<0.05）,其中以原发性高血压伴肥胖组差异最为显著;T与C等位基因例数进行多重比较,有显著差异（P<0.05）,其中以原发性高血压伴肥胖组差异最为明显。按基因型分组统计分析各组血浆肾素、血管紧张素Ⅱ及醛固酮水平,TT基因型组显著高于TC、CC基因型组（P<0.05）。结论 原发性高血压伴肥胖患者CYP11B2－344C/T基因型以TT基因型为主,等位基因以T等位基因为主。TT基因型血浆RAAS激素水平各组份比TC、CC基因型显著升高,TT基因型可能为原发性高血压伴肥胖患者易感基因型。     

醛固酮合成酶（CYP11B2）基因T（—344）C多态性与高血压病相关性研究

目的 本研究探讨醛固酮合成酶基因(CYP11B2)基因T(-344)C多态性与原发性高血压之间关系。方法 选取吉林省原发性高血压患者107例，其中男64例，女43例。正常人127例，其中男73例，女54例。排除高血压病及其它器质性疾病。所有研究对象用常规方法提取白细胞DNA。采用多聚酶链反应结合限制性内切酶(Hae Ⅲ)方法检测CYP11B2基因T(-344)C多态性。结果 共扩增成功122例正常人和101例高血压患者DNA标本。原发性高血压组和正常对照组CYP11B2基因T(-344)C多态性基因型TT、CT、CC分布分别为6、28、67和5、59、58，其中C、T等位基因频率在两组分别为0．20、0．80和0．28、0．72。原发性高血压组TT基因型，T等位基因频显著高于正常对照组，CT基因型，C等位基因频率显著低于正常对照组(P＜0．05)。结论 本研究提示醛固酮合成酶基因(CYP11B2)基因T(-344)C多态性与中国人原发性高血压有关，可能是中国人原发性高血压的一个遗传标志。     

Specifics of distribution of polymorphic markers of the renin-angiotensin-system genes, relation to ventricular hypertrophy in patients with essential hypertension of Uzbek nationality

AIM: To study distribution of polymorphisms of angiotensin converting enzyme (ACE), angiotensin II type 1 receptor (AT1R), aldosterone synthase (CYP11B2) genes, and their association with processes of left ventricular remodeling in men of uzbek nationality with essential hypertension (EH). MATERIAL AND METHODS: Patients with stage 1-2 EH were genotyped for carrying I/D polymorphism of ACE gene, A1166C polymorphism of AT1R gene, and C(-344)T polymorphism of CYP11B2 gene. Echocardiography was used for measurement of left ventricular myocardial mass index. RESULTS AND CONCLUSIONS: Special features of distribution of studied genes among uzbek men were the following: accumulation of ID-genotype of I/D polymorphic marker of ACE gene among patients with EH, predominance of I-allele and II-genotype of ACE gene in healthy persons; accumulation of AA-genotype and A-allele of A1166C polymorphic marker of AT1R gene in patients with EH and healthy persons, while CC genotype was found only in patients with EH; predominance of CT genotype of C(-344)T polymorphic marker of CYP11B2 gene in patients with EH and healthy persons with high prevalence of T-allele in patients with EH. Carriage of TT genotype of C(-344)T polymorphic marker of CYP11B2 was associated with higher values of diastolic blood pressure. Associations were revealed between carriage of TT-genotype and T-allele of CYP11B2 gene, AC+CC-genotypes of AR1R gene and severity of left ventricular hypertrophy.     

CYP11B2 gene polymorphism and essential hypertension among Tibetan,Dongxiang and Han populations from northwest of China

Essential hypertension (EH) is a complex multifactorial condition influenced by both genetic and environmental factors; aldosterone synthase (CYP11B2) is a key enzyme which involves in the terminal steps of aldosterone synthesis. The result of relationship between C-344T of CYP11B2 polymorphism and EH was controversial. This study was undertaken to investigate the association of C-344T polymorphism with EH in the populations of Tibetan, Dongxiang and Han from northwest of China. A total of 2115 participants aged 18–70 years were enrolled in this study. In total, 1776 blood samples, including 545 Tibetan (305 hypertensive and 240 normotensive), 530 Dongxiang (254 hypertensive and 276 normotensive) and 701 Han (338 hypertensive and 363 normotensive), were analyzed successfully by using Snapshot minisequencing method, 30 samples were also performed by direct sequencing (5 hypertensive and 5 normotensive in each population, respectively). The frequencies of genotype and allele of CYP11B2 (C-344T) were not significantly different between EH group and control group in every ethnic population (p > 0.05). However, in female population of Tibetan, the frequencies of CC and CT genotype and C allele in EH group were higher than in control (p < 0.05) group. The frequencies of CC genotype and C allele in both the normotensive controls and EH patients in Tibetan population were higher than in Dongxiang and Han populations. Our study suggests that there is lack of association between C-344T polymorphism of CYP11B2 gene and EH in Dongxiang and Han populations, whereas the polymorphism was correlated with EH in female population of Tibetan.     

醛固酮合酶基因多态性与原发性高血压及血浆醛固酮水平的关系

目的　探索武汉地区汉族人群中醛固酮合酶 (CYP11B2 )基因 3 44C/T多态性与原发性高血压 (EH)的相关性 ,及高血压人群醛固酮合酶CYP11B2基因 3 44C/T多态性与血浆醛固酮(pAldo)水平的相关性。方法　应用PCR RELP技术对 2 0 4例CYP11B2基因 3 44C/T多态性进行分析 ,应用放射免疫法测定 10 6例EH组的血浆醛固酮水平。结果　CYP11B2基因 3 44C/T多态性以TT和CT为主要基因型 ,与EH无明显相关性 (P >0 .0 5 )。高血压患者血浆醛固酮水平在CYP11B2基因 3 44C/T的 3个不同基因型组比较差异有显著性 (P <0 .0 1)。结论　武汉地区汉族人群CYP11B2基因 3 44C/T多态性频率与EH没有明显相关性。高血压人群的血浆醛固酮水平与CYP11B2基因 3 44C/T多态性相关     

醛固酮合酶基因-344 C/T的多态性与心房颤动的关联研究

目的:探讨醛固酮合酶(CYP11B2)基因 -344 C/T的多态性与心房颤动(Af)的关系.方法:研究对象均来自湖北地区汉族人群,包括120例Af患者,120例非Af者.采用成组配比研究,取静脉血,提取基因组DNA,采用聚合酶链反应-限制性酶切片段长度多态性(PCR-RFLP)分析技术对2组人群CYP11B2基因-344 C/T的多态性进行分析.结果:CYP11B2 -344 CT+CC基因型频率在Af组与对照组之间差异有统计学意义(53.4%:37.5%,P=0.037),等位基因在2组间亦存在同样的趋势(C/T=28.8%:19.6%, P=0.019).单因素非条件Logistic回归分析CT+CC基因型频率患Af的危险性高(OR=1.82,95%CI 1.02～3.22, P=0.04), 排除混杂因素后, CT+CC基因型与人群患Af的风险呈弱相关(OR=1.73,95%CI 0.99～3.02,P=0.056);排除混杂因素后,左房内径与人群患Af的风险总是呈显著相关(OR=8.14,95%CI 3.43～19.31,P=0.000).结论:在湖北地区汉族人群中, CYP11B2 -344 C/T的点突变与Af的发病呈弱相关性,有可能是Af的遗传危险因素,左房内径的增加与Af的发病呈显著相关.     

醛固酮合成酶基因多态性与高血压及左室肥厚的关系

目的：本研究旨在观察血管紧张素转换酶（ACE）基因I／D多态性和醛固酮合成酶（CYP11B2）基因－344C／T多态性与高血压（EH）及左室肥厚（LVH）的相关性。方法：将136例原发性高血压病患者分为LVH组72例,无LVH组64例;应用多聚酶链式反应（PCR）、限制性内切酶方法检测ACE和CYP11B2基因的多态性。结果：（1）无LVH组LVH组ACE基因I／D多态性基因型和等位基因分布差异均有显著性（P＜0．05）,LVH组Ⅱ基因型和Ⅰ等位基因频率显著高于无LVH组。（2）无LVH组与LVH组CYP11B2基因－344C／T多态性基因型和等位基因分布差异均有显著性（P＜0．05）,LVH组CT基因型和C等位基因频率显著高无LVH组。（3）LVH组中的CT＋Ⅱ联合基因型频率高于无LVH组（P＜0．05）。结论：（1）ACE型I／D和CYP11B2基因－344C／T多态性与高血压发生无相关性。（2）ACE基因Ⅱ多态性与LVH相关。(3）CYP11B2基因－344CT基因型与LVH相关。（4）CYP11B2基因－344CT基因型和ACE基因Ⅱ基因型共存对LVH的发病具有协同作用。     

醛固酮合成酶基因多态性及生活习惯与急性脑梗死易感性的关系

目的研究醛固酮合成酶（CYP11B2）基因-344T／C多态性及烟酒茶嗜好相互作用与急性脑梗死（ACI）易感性的关系。方法采用病例对照研究方法，调查研究对象的生活习惯，采用聚合酶链反应限制性内切酶长度多态性（PCR-RFLP）方法检测CYP11B2的基因型。结果病例组CYP11B2基因TC和CC基因型的频率娃著高于对照组，分别为38．12％和9．97％；相对于TT基因型，暴露于TC和CC基因型人群的OR值分别为1．72和1．88。病例组C等位基因的频率也显著高于对照组，为29．03％；相对于T等位基因，C等位基因的OR值为1.57。此外研究还显示：CYP11B2基因TC或CC基因型与吸烟相互作用可增加ACI的易感性，而该基因型与饮酒、饮茶无显著相互作用。结论当个体携带TC或CC基因型时，ACI的易感性增加，该两种基因型与吸烟相互作用，可增加ACI的易感性。     

Aldosterone synthase gene polymorphism as a determinant of atrial fibrillation in patients with heart failure

We analyzed the possible association between aldosterone synthase (CYP11B2) T-344C polymorphism, which is associated with increased aldosterone activity, and the prevalence of atrial fibrillation (AF) in 196 consecutive patients who had symptomatic systolic heart failure (HF; left ventricular ejection fraction <40%) for > or =3 months before recruitment. Genomic DNA was extracted from peripheral blood leukocytes using a standard protocol. Subjects were genotyped for the CYP11B2 polymorphism using the polymerase chain reaction/restriction fragment length polymorphism approach. AF was present in 63 patients (33%) with HF. We found the -344 CC genotype to be a strong independent marker for AF. Almost 1/2 (45%) of patients with this genotype had AF compared with 1/4 (27%) with -344 TT and TC genotypes (p = 0.01). A multivariate stepwise logistic regression model that included age, gender, New York Heart Association class, CYP11B2 -344CC genotype, and echocardiographic measurements of left ventricular ejection fraction, left atrial dimension, left ventricular end-diastolic diameter, and mitral regurgitation severity showed that the CYP11B2 CC genotype (adjusted for age and left atrial size) was an independent predictor of AF (adjusted odds ratio 2.35, 95% confidence interval 1.57 to 3.51, p = 0.03). In conclusion, CYP11B2 T-344C promoter polymorphism predisposes to clinical AF in patients with HF.     

Multiple Polymorphisms in the renin- angiotensin-aldosterone system (ACE, CYP11B2, AGTR1) and their contribution to hypertension in African Americans and Latinos in the multiethnic cohort

OBJECTIVE: When compared with other U.S. populations, African Americans have excess hypertension. Genetic variants in elements of the renin-angiotensin-aldosterone system (RAAS), namely the angiotensin-converting enzyme (ACE), aldosterone synthase (CYP11B2), and angiotensin II type 1 receptor (AGTR1) genes, have been associated with risk of hypertension in some populations. METHODS: We genotyped the D/I polymorphism in the ACE gene, the C(-344)T polymorphism in the CYP11B2 gene, and the C(-535)T polymorphism in the AGTR1 gene among African American and Latino members of the Multiethnic Cohort Study (MEC) to determine their association with hypertension. RESULTS: We observed no significant increase in the risk of hypertension for either African Americans or Latinos homozygous or heterozygous for the D allele of the ACE gene. Among African Americans we observed carriers of the (-344)T allele of CYP11B2 to be at increased risk of hypertension (versus CC genotype: TC genotype, OR = 1.66 [95% CI: 1.01-2.72]; TT genotype, OR = 1.74 [95% CI: 1.07-2.82]). There was also an increase in risk of hypertension associated with the AGTR1 T allele for African Americans (versus CC genotype: TC genotype, OR = 2.62 [95% CI: 1.46-4.72]; TT genotype, OR = 2.67 [95% CI: 1.51-4.74]). The associations observed with CYP11B2 and AGTR1 genotypes were not observed among Latinos. CONCLUSION: These data suggest that the (-535)T allele of AGTR1 and (-344)T allele of CYP11B2 may increase hypertension risk among African Americans but not among Latinos. Characterization of the linkage disequilibrium and haplotype patterns in the RAAS pathway genes will be crucial to understanding differences in hypertension susceptibility in these ethnic populations.     

Positive association of CYP11B2 gene polymorphism with genetic predisposition to essential hypertension

Predispositions to essential hypertension and cardiovascular diseases are possibly associated with gene polymorphisms of the renin-angiotensin system. Gene polymorphisms of angiotensinogen and angiotensin-converting enzyme genes have been suggested to be risk factors for hypertension and myocardial infarction. Concerning the polymorphism of aldosterone synthase (CYP11B2) gene, earlier studies have shown inconsistent results in terms of its relation to hypertension. In the present case-control study, we investigated the association of -344T/C polymorphism in the promoter region of human CYP11B2 gene with genetic predisposition to hypertension. The genotype of -344T/C polymorphism was determined in essential hypertension subjects (n=250) and normotensive subjects (n=221). The distributions of three genotypes (TT, TC, and CC) were significantly different between the hypertensive and the normotensive groups (chi(2)=9.61, P=0.008). Namely, the frequency of C allele was higher in the hypertensive patients than in the normotensive subjects (34.2 vs 26.5%, P=0.010). Our data suggest that the -344C allele of CYP11B2 gene polymorphism is associated with the genetic predisposition to develop essential hypertension.     

Promoter variants of aldosterone synthase gene (CYP11B2) and salt-sensitivity of blood pressure

The T(-344)C polymorphism in promoter of CYP11B2 gene encoding aldosterone synthase has been associated with differences in plasma aldosterone (ALDO) concentrations. In addition, the results of recent study carried out in Japan suggest that C(-344) allele of CYP11B2 may be a genetic marker of salt-sensitive hypertension characterized by low plasma renin activity (PRA) and high ALDO/PRA ratio. Therefore, it raises the question of whether the T(-344)C polymorphism of CYP11B2 gene may be associated with salt-sensitive hypertension in Caucasians. The DNA samples were obtained from 68 Polish hypertensives. During 3 subsequent 1-week periods each subject received diets of normal, low and high sodium content (120-140, 20-40 and 240-260 mmol Na+/day, respectively). Salt sensitivity was expressed as the difference between mean arterial pressure (MAP) on high salt diet and MAP on low salt one (delta MAPH-L). Genomic DNA isolated from peripheral blood nuclear cells was amplified by PCR method with primers flanking the polymorphic region and C(-344) allele was identified by gain of Hae III restriction site. There were 14 TT homozygotes (20.6%), 35 TC heterozygotes (51.5%) and 19 CC homozygotes (27.9%) in the studied group. No significant differences in delta MAPH-L, glomerular filtration rate, natriuresis, excreted fraction of filtered sodium, PRA, ALDO and ALDO/PRA ratio determined on each diet have been found in subjects according to CYP11B2 genotype. Our preliminary results suggest the lack of association of the T(-344)C CYP11B2 polymorphism with salt-sensitive hypertension as well as with activity of plasma renin-angiotensin-aldosterone system in Caucasian patients.