血管紧张素系统基因多态性与原发性高血压的相关研究

目的：探讨中国人血管紧张素原（angiotensinogen,AGT)基因的蛋白产物M235T、血管紧张素Ⅱ-I型受体（AT1R)基因的蛋白产物A1166C以及血管紧线素转换酶（angiotensin convertingenzyme,ACE)基因I／D多态性与高血压病（hypertension,HT)的关系。方法：用PCR以及PCR加酶解方法检测了161例HT患者及134名健康人（normotensive controls,NT)ACEI/D基因多态性、AGTM235T及AT1RA1166C突变,并检测了血清ACE活性。结果：HT组ACEI／D基因多态性等位基因频率I为0．571,D为0．429,等位基因频率及基因型频率与NT组比较差异无显著性（P＞0．05）;＜60岁HT组D等位基因频率（0．457)显著高于NT组（0．358,P＜0．05）。HT组与NT组的AGT235T分别为0．813及0．832,两组间差异无显著性。AT1RA1166C的C等位基因频率HT组为0．021,NT组为0．053,两组间差异无显著性;但在＜60岁NT组AGTM235T显著高于NT组。两组中均发现ACE基因型与血清ACE活性相关。HT组DD－TT及ID－TT联合基因型显著高于对照组。结论：D等位基因及AGT235T对于HT早期发病可能有重要意义,DD－TT及ID－TT基因型人群可能是高血压发病的高危人群。     

血管紧张素转换酶和血管紧张素原基因多态性及其与青海妊娠高血压疾病的相关性

目的探讨血管紧张素转换酶(ACE)和血管紧张素原(AGT)基因表达、基因多态性与青海孕产妇妊娠高血压疾病的相关性。方法选择210例妊娠高血压患者(HDCP组)和220例正常孕妇(CK组),运用限制性内切酶片段长度多态性聚合酶链反应(PCR-RFLP)方法检测AGT M235T、ACE I/D基因多态性。结果CK组ACE基因DD、ID、Ⅱ所占比例分别为28.18%、47.73%、24.09%,HDCP组分别为33.81%、51.90%、14.29%(P<0.05,故两组的ACE基因分布有差异),HDCP组和对照组ACE I/D多态性等位基因I和D频率分布有差异(P<0.05),HDCP组D等位基因频率高于对照组(χ^2=5.188,P<0.05),ACE基因型分布符合Hardy-Weinberg遗传平衡(χ^2=0.423,df=2,查表χ^2界值表,P>0.05,达到遗传平衡);CK组AGT基因MM、MT、TT所占比例分别为24.09%、43.64%、32.27%,HDCP组分别为15.71%、42.86%、41.43%(P<0.05,故两组的AGT基因分布差异有统计学意义),HDCP组和对照组AGT M235T多态性等位基因M和T频率分布有差异性(P<0.05),HDCP组T等位基因频率高于对照组(χ^2=6.796,P<0.05),AGT基因型分布符合Hardy-Weinberg遗传平衡(χ^2=3.242,df=2,查表χ^2界值表,P>0.05,达到遗传平衡)。结论ACE I/D多态性和AGT M235T多态性与青海省汉族妊娠期高血压疾病有关,D等位基因和T等位基因可能是妊娠高血压疾病的易感基因。     

Polymorphisms in the renin-angiotensin system and endothelium-dependent vasodilation in normotensive subjects.

BACKGROUND: Our aim was to test the hypothesis that genes encoding components in the renin-angiotensin system influence endothelial vasodilatory function. METHODS: In 59 apparently healthy, normotensive individuals, endothelium-dependent vasodilation (EDV) and endothelial-independent vasodilation (EIDV) was evaluated by infusing metacholine and sodium nitroprusside into the brachial artery. Forearm blood flow was measured by venous occlusion plethysmography. The ACE insertion (I)/deletion (D) polymorphism, the T174M and M235T angiotensinogen restriction fragments length polymorphisms, the angiotensin II receptor type 1 (AT1R) A1166C, and the aldosterone synthase gene (CYP11B2) C-344T polymorphisms were analysed. RESULTS: When analysing the ACE, the two angiotensinogen and the aldosterone synthase CYP11B2 genotypes independently, no significant association with endothelial vasodilatory function was found. However, a significant reduction in endothelium-dependent vasodilation was observed in the subjects (n=9) with the ACE D allele and the angiotensinogen T174M genotype (P<0.05). Subjects with the AT1R genotype AC showed a reduction in both EDV (P=0.05) and EIDV (P=0.04) when compared with those with the AA genotype. CONCLUSIONS: The subjects with the ACE D allele in combination with the angiotensinogen T174M genotype are associated with a reduced EDV. This together with the observation that the AC AT1R genotype is associated with a reduction in both EDV and EIDV, supports the hypothesis that endothelial vasodilatory function is influenced by genes in the renin-angiotensinogen system.     

Sequence variants of ACE, AGT, AT1R, and PAI-1 as genetic risk factors for vascular dementia

Sequence variants of angiotensin converting enzyme (ACE) insertion/deletion (I/D), angiotensinogen (AGT) T235M, angiotensin II type 1 receptor (AT1R) A1166C, and plasminogen activator inhibitor-1 (PAI-1) 4G/5G were analyzed to see their genetic associations with vascular dementia as its candidate genetic risk factors involving renin-angiotensin and fibrin systems. While the ACE I/D, AT1R A1166C, and PAI-1 4G/5G did not contribute to the genetic susceptibility to vascular dementia (P>0.05), a significant association with vascular dementia was shown in the T235M polymorphism of AGT. The frequency of the M allele in patients was higher than in controls with the odds ratio (OR) estimate of 1.51 (P<0.05). In a dominant model, the TM+MM genotypes increased the risk of vascular dementia compared to the TT genotype (OR=2.01; P<0.001). The current results suggested that AGT T235M polymorphism might be a risk factor of vascular dementia.     

血管紧张素原及血管紧张素转化酶基因多态性与高血压之间的关系

目的 研究血管紧张素原基因（ａｎｇｉｏｔｅｎｓｉｎｏｇｅｎ,ＡＧＴ）第２外显子Ｍ２３５Ｔ等位基因的变异及血管紧张素转换酶（ａｎｇｉｏｔｅｎｓｉｎ ｃｏｎｖｅｒｔｉｎｇ ｅｎｚｙｍｅ,ＡＣＥ）基因多态性、在中国正常人群及原发性高血压（ｅｓｓｅｎｔｉａｌ ｈｙｐｅｒｔｅｎｓｉｏｎ,ＥＨ）患者中的频率分布,分析基因在ＥＨ中的发病作用。方法 应用多聚酶链反应结合限制性酶切方法,对９５例健康体检者和８７例Ｅ     

AGT、ACE基因多态性与成人过敏性紫癜和过敏性紫癜性肾炎的相关性

目的探讨肾素-血管紧张素系统中AGT基因M235T和ACE基因I／D多态性与过敏性紫癜和过敏性紫癜性肾炎易感性的关系。方法应用PCR和PCR—RFLP技术检测145例过敏性紫癜／过敏性紫癜性肾炎患者与172例正常对照组血管紧张素原基因第2外显子M235T多态性及血管紧张素转换酶基因第16内含子I／D多态性。结果①AGT基因型构成比在HSP组、HSPN组与正常对照组之间差异有统计学意义（P=0．008,P=0．002）,但在HSP和HSPN之间差异无统计学意义（P=0．180）。AGT—TT基因型和丁等位基因携带者具有较高的患HSP、HSPN的风险。②ACE基因型构成比在HSPN组与正常对照组之间差异有统计学意义（P=0．003）,但在HSP和正常对照组、HSP和HSPN之间差异无统计学意义（P=0．065,P=0．073）。ACE—DD基因型和D等位基因携带者具有较高的患HSPN的风险。结论携带AGT基因M235T多态性增加患HSP／HSPN的风险,携带ACE基因I／D多态性增加患HSPN的风险。     

血管紧张素原基因M235T多态性与肥厚型心肌病的关系

目的　探讨血管紧张素原 ( angiotensinogen,AGT)基因 M2 35 T变异与肥厚型心肌病( hypertrophic cardiomyopathy,HCM)的关系。方法　对 72例 HCM患者与 80名正常对照者进行病例 -对照研究。采用聚合酶链反应与限制性片段长度多态性技术检测 AGT基因 M2 35 T变异。同时通过 M型二维超声心动图分别测量室间隔、左室后壁和心尖部心肌厚度。结果　 ( 1)经 PCR扩增及 Tth111 酶切 ,AGT基因型有 3种形式 :MM、TT与 MT基因型。两组 AGT基因型的分布均符合 Hardy- Weinberg平衡。 ( 2 )AGT基因 M2 35 T基因型在 HCM组与对照组的分布差异有显著性 ( χ2 =6 .0 90 ,P<0 .0 5 )。HCM组 TT基因型与 T2 35等位基因的频率均高于对照组 ( TT基因型 :0 .6 3vs0 .4 5 ,OR=2 .0 37,95 % CI:1.0 6 4～7.899,P<0 .0 5 ;T2 35等位基因 :0 .78vs0 .6 4 ,OR=1.990 ,95 % CI:1.197～ 3.30 8,P<0 .0 1)。 ( 3) HCM组TT基因型患者左室壁最厚处平均厚度明显大于 MM、MT基因型患者 [( 19.1± 4 .8) mm vs( 15 .3± 2 .6 )mm与 ( 16 .2± 5 .1) mm,F=4 .2 6 1,P<0 .0 5 ]。结论　 AGT基因 M2 35 T变异与 HCM的发病显著相关 ,TT基因型或 T2 35等位基因可能是参与 HCM发生及加重心肌肥厚的一个遗传方面的危险因素     

血管紧张素原、血管紧张素Ⅱ一型受体基因多态性与原发性高血压的相关性研究

目的 :探讨血管紧张素原AGT(M2 3 5T)、血管紧张素Ⅱ一型受体AT1 R(A1166C)基因多态性与中国四川籍人群原发性高血压(EH)的关系。方法 :采用聚合酶链反应 (PCR)及限制性片段长度多态性分析 (RFLP)方法分析人类白细胞染色体DNA中AGT、AT1 R基因多态性。结果 :12 2例EH病例组与 87例正常对照组AGT等位基因频率T、M分别为 :T :0 .82 8vs 0 .661,M :0 .172vs 0 .3 3 9。AT1 R等位基因频率A、C分别为 :A :0 .968vs 0 .989,C :0 .0 3 2vs 0 .0 11。各基因型频率及等位基因频率符合Hardy Weinberg平衡定律。EH病例组AGT基因T等位基因频率和TT型明显高于对照组(χ2 =11.7,P <0 .0 1和 χ2 =15 .6,P <0 .0 1)。结论 :AGT基因多态性与EH密切相关 ;而AT1 R基因多态性与EH无关。     

血管紧张素原基因M235T分子变异与心肌梗塞的关系

目的为探讨血管紧张素原（ＡＧＴ）基因Ｍ２３５Ｔ分子变异与心肌梗塞（ＭＩ）的关系。方法采用聚合酶链反应、限制性片段长度多态性分析，对５７例ＭＩ患者和７６例无冠心病证据的对照组进行ＡＧＴ基因Ｍ２３５Ｔ等位基因检测。结果ＭＩ患者ＡＧＴ基因２３５ＴＴ型（０．７０）和Ｔ２３５等位基因（０．８２）的频率显著高于对照组（分别为０．４２和０．６３，Ｐ＝０．０１３和Ｐ＜０．０２５）。经校正冠心病的主要危险因素后，ＡＧＴ基因２３５ＴＴ型仍可显著增加心肌梗塞发生的危险性（比数比３．６５，Ｐ＝０．０１６）。结论ＡＧＴ基因２３５ＴＴ型可能是中国人群ＭＩ发病的重要危险因素之一。     

Angiotensinogen Gene M235T and T174M Polymorphisms and Susceptibility of Pre-Eclampsia: A Meta-Analysis

There are controversies in reports on the association of the angiotensinogen (AGT) gene polymorphisms with the risk of developing pre-eclampsia (PE). We performed a meta-analysis to examine the association between the AGT polymorphisms and PE risk: M235T (31 studies involving 2555 patients and 6114 controls) and T174M (six studies involving 681 patients and 2076 controls). For the M235T polymorphism, the TT genotype increased the PE risk as compared to the MM genotype (odds ratio 1.61, 95% confidence intervals 1.22-2.14, P= 0.001). When stratified by ethnicity, the TT genotype remained significantly associated with higher PE risk in Caucasians and Mongolians but not in Africans. Similar results were also obtained under all three genetic models of the M235T polymorphism. For the T174M polymorphism, no significant association was found in the comparisons (MT vs. TT and MM vs. TT) and under any genetic models. The analysis excluding the highly significant Hardy-Weinberg equilibrium-violating studies and sensitivity analysis further strengthened the validity of these associations. No publication bias was observed in this study. This meta-analysis demonstrates that the AGT M235T polymorphism is significantly associated with PE whereas the T174M polymorphism is not.     

Relationship of polymorphisms in the renin-angiotensin system and in E-selectin of patients with early severe coronary heart disease

 Previous association studies between angiotensin-converting enzyme (ACE) and angiotensinogen (AGT) polymorphisms and several cardiovascular diseases have reported variable results. Therefore we examined the association of the DNA variants of ACE and AGT with early, severe coronary heart disease (CHD). In addition, we compared the genotypes of both polymorphisms and the recently discovered polymorphism in the E-selectin gene in both patients and an unselected population. This study included 113 patients with severe CHD (50 years old or less) and up to 197 control subjects. The frequencies of the ACE I/D variants were 48% I and 52% D in the controls and 46% I and 54% D in the patients. The frequencies of the AGT-M235T polymorphism were 60.8% M and 39.2% T in controls and 49.1% M and 50.9% T in the patients. The frequencies of the S128R polymorphism of the E-selectin were 91.3% S and 8.7% R in controls and 84.5% S and 15.5% R in the patients. In our studies the DD genotype of ACE was not associated with early severe CHD. We found a correlation between the M235T molecular variant of AGT and the S128R variant of E-selectin to early severe CHD. Received: 15 February 1996 / Accepted: 2 October 1996     

Association of angiotensinogen haplotypes with angiotensinogen levels but not with blood pressure or coronary artery disease: the Ludwigshafen Risk and Cardiovascular Health Study

Angiotensinogen and its cleaved forms angiotensin I and angiotensin II are important regulators of blood pressure. The gene for angiotensinogen (AGT) carries two common polymorphisms, T207M and M268T (previously described as T174M and M235T). To investigate the role of haplotypes formed by these polymorphisms for angiotensinogen levels we examined blood pressure, coronary artery disease (CAD), myocardial infarction (MI), and AGT genotypes and haplotypes in 2,575 patients with angiographically documented CAD and 731 individuals in whom CAD had been ruled out by angiography. Three haplotypes, designated as Hap1 (T207, M268), Hap2 (T207, T268) and Hap3 (M207, T268), accounted for more than 99% of alleles. The AGT Hap2 haplotype was significantly associated with angiotensinogen levels; one additional Hap2 allele accounted for an approx. 8% increase in angiotensinogen. This association was stronger than that of either single polymorphism. AGT genotypes or haplotypes were not related to hypertension, CAD or MI. We conclude that a common haplotype of the angiotensinogen gene is linked to angiotensinogen levels but has no major impact on blood pressure, hypertension, or cardiovascular risk.     

Association of 3 gene polymorphisms with atopic diseases

BACKGROUND: Various peptidases, including angiotensin-converting enzyme (ACE), inactivate some inflammatory peptides that are considered to influence the pathogenesis of atopic diseases. This enzyme is also involved in the conversion or activation of 2 bronchoconstriction mediators: angiotensin II from angiotensinogen and endothelin (ET), respectively. OBJECTIVE: We tested a hypothesis that asthma or other atopic diseases are associated with insertion/deletion ACE, M235T angiotensinogen, and TaqI ET-1 gene polymorphisms. METHODS: A case-control approach was used in the study. Healthy subjects (141 persons) were used as control subjects, and 231 patients with histories of atopic asthma, allergic rhinitis, atopic dermatitis, or a combination thereof were studied. ACE genotype was determined by PCR, angiotensinogen M235T and ET-1 by PCR, and restriction analysis by AspI and TaqI, respectively. RESULTS: We found the significant association of the insertion/deletion polymorphism of the ACE, as well as that of M235T polymorphism of the angiotensinogen genes, with the group of patients with atopic diseases ( P =.0025 and P =.0204, respectively). No difference was proved for the intron 4 (position 8000) polymorphism in the ET-1 gene when comparing the atopic patients with the control group (P =.1774). A significant difference was found between groups of patients with both asthma and rhinitis and patients without both respiratory atopic diseases (P =.0033). CONCLUSION: It follows that the examined polymorphisms in the genes for ACE, angiotensinogen, and ET-1 could participate in the etiopathogenesis of atopic diseases.     

血管紧张素原基因CD235Met→Thr变异与脑梗塞发病的关系

目的 探讨血管紧张素原（ａｎｇｉｏｔｅｎｓｉｎｏｇｅｎ,ＡＧＴ）ＡＤ ＬＤ ＥＴ→Ｔｈｒ变异与中国人脑梗塞发病的关系。方法 应用聚合酶链反应－限制笥片段长度多态性分析,对８２名正常健康人和１０２例脑梗塞患者进行了ＡＧＴ基因ＣＤ２３５Ｍｅｔ→Ｔｈｒ变异多态性分析。结果 经ｘ＾２检验,ＡＧＴ基因Ｔ／Ｔ基因型和Ｔ等位基因频率脑梗塞组（５１．９％和７０．１％）与正常对照组（４２．０％和６５．２％）之间相比     

血管紧张素原基因的六种单核苷酸多态与原发性高血压的相关性

目的　研究血管紧张素原 (angiotensinogen,AGT)基因 6个位点的单核苷酸多态及其构成的单倍型与中国汉族人原发性高血压的相关性。方法　采用多重SNa Pshot反应 ,在 185例原发性高血压患者和185名健康对照者中 ,对 AGT基因启动子区域的 G- 2 17A、G- 15 2 A、A- 2 0 C、G- 6 A及第 2外显子的T174 M和 M2 35 T多态进行基因分型。结果　 6种单核苷酸多态的基因型分布及其等位基因频率在原发性高血压组和对照组中差异无显著性 (P>0 .0 5 )。单倍型分析提示由 - 15 2 A,- 2 0 C,- 6 A和 2 35 T等位基因构成的 H4单倍型在原发性高血压组中明显增加 ,与对照组相比差异有显著性 (P<0 .0 5 )。结论　AGT基因G- 15 2 A,A- 2 0 C,G- 6 A和 M2 35 T多态可能对中国汉族人原发性高血压的发病起了重要作用。     

妊娠高血压综合征患者血管紧张素转化酶基因多态性研究

目的探讨血管紧张素Ⅰ转化酶（ＡＣＥ）基因第１６内含子插入／丢失多态性与妊娠高血压综合征（简称妊高征）的关系。方法应用聚合酶链反应,检测６０例妊高征患者及对照组７６例正常孕妇的ＡＣＥ基因中第１６内含子是否有Ａｌｕ重复结构存在。结果６０例妊高征患者中ＡＣＥ基因Ｉ型和ＤＤ型频率分别为１５％（９／６０）和６５％（３９／６０）,而７６例正常晚期妊娠妇女中则分别为５０％（３８／７６）和１０．５％（８／７６）。妊高征组的缺失型（Ｄ型）ＡＣＥ等位基因出现频率为０．７５,高于对照组的０．３０８,差异有显著性（Ｐ＜０．０１）。结论提示Ｉ型基因是妊高征的保护性基因,ＤＤ型基因是妊高征的易感基因,ＡＣＥ基因的缺失多态性（ＤＤ）可能与妊高征的发病有关。     

肾素-血管紧张素系统基因多态性与糖尿病及合并肾病的关系

目的探讨血管紧张素I转换酶(ACE)基因及血管紧张素原(AGT)基因与2型糖尿病(DM)及合并糖尿病肾病(DN)的相关性。方法分别用PCR、突变基因分离聚合酶链反应(MS-PCR)技术对195例2型DM患者和136例正常对照者的ACEI/D与AGTM235T多态性进行检测。结果(1)DM组ACE-DD基因型和D等位基因频率均比对照组显著增高(P<0.001)。(2)DN(+)组ACE基因型和等位基因频率与DN(-)组比较无显著性差异。(3)AGT基因型分布与等位基因频率在3组中均无显著性差异。(4)联合分析ACE-DD型及AGT-TT型对DN(+)、DN(-)的OR分别为4.17和3.16;均高于单基因DD型及TT型的OR值。结论(1)ACEDD基因型和D等位基因可能是广西地区人群2型DM的易感因素。(2)未发现ACEI/D或AGTM235T多态性单一因素与2型DM患者中DN的发生有关联。(3)ACE-DD基因型与AGTM235T-TT基因型在2型DM及DN发生中有协同作用。     

The ACE-DD genotype is associated with endothelial dysfunction in postmenopausal women

OBJECTIVE: To evaluate the effects of the angiotensin-converting enzyme (ACE) insertion/deletion (I/D), the angiotensinogen M235T and the angiotensin II type 1 receptor A1166C polymorphisms, and hormone therapy used on endothelial function in postmenopausal women without manifestation of coronary artery disease. DESIGN: Sixty-four postmenopausal women (42 hormone therapy users and 22 hormone therapy nonusers) without clinical manifestation of coronary artery disease were evaluated using external vascular ultrasonography to measure endothelium-dependent (hyperemic response, flow-mediated dilatation) and -independent (nitroglycerin) dilatation. Genotypes were determined by polymerase chain reaction amplification. RESULTS: Women with the ACE-DD genotype displayed a lower flow-mediated dilatation compared to those with the ACE-II genotype (8.4% +/- 3.9% vs 12.6% +/- 5.4%, P = 0.04). Endothelial function was not associated with the angiotensinogen M235T and anglotensin II type 1 receptor A1166C polymorphisms. ACE polymorphism seems to modulate endothelial function among postmenopausal women without hormone therapy (8.2% +/- 5.1% vs 18.4% +/- 5.9% for the DD and the II genotype, respectively, P = 0.02). However, in hormone therapy users, flow-mediated dilatation was similar according to the ACE genotypes. CONCLUSIONS: Our findings suggest that ACE-I/D polymorphism is related to endothelial dysfunction in postmenopausal women. Furthermore, a potential interaction between estrogen users and ACE polymorphism on endothelial function may be present.     

血管紧张素原基因M235T分子变异与2型糖尿病肾病的关系

目的　探讨血管紧张素原（ａｎｇｉｏｔｅｎｓｉｎｏｇｅｎ , Ａ Ｇ Ｔ） 基因 Ｍ２３５ Ｔ 分子变异与中国人无肾病并发症的２ 型糖尿病（ｄｉａｂｅｔｅｓ ｍ ｅｌｌｉｔｕｓ , Ｄ Ｍ） 、２ 型糖尿病肾病（ｄｉａｂｅｔｉｃ ｎｅｐｈｒｏｐａｔｈｙ , Ｄ Ｎ） 的关系。方法　用 Ｐ Ｃ Ｒ及 Ｒ Ｆ Ｌ Ｐ 方法对８４ 例 Ｄ Ｍ、９６ 例 Ｄ Ｎ 及９８ 名正常对照进行了 Ａ Ｇ Ｔ 基因 Ｍ２３５ Ｔ 多态性的检测。结果　 Ｄ Ｎ 组 Ｔ 等位基因频率０８２ , Ｔ Ｔ 基因型频率０７０ ,与对照组（０６３ ,０４３） 比较有显著差异（ Ｐ＝ ０００３ , Ｐ＝００００４） ;校正了 Ｄ Ｎ 的几种危险因素后, Ｔ Ｔ 基因型对 Ｄ Ｎ 的 Ｏ Ｒ 为３４７（９５ ％ Ｃ Ｉ 为１５１ ～７９４ , Ｐ＝０００３３） 。 Ｄ Ｍ 组基因型频率分布与对照组比较无显著差异（ Ｐ＞ ００５） 。结论　 Ａ Ｇ Ｔ 基因 Ｔ Ｔ 型可能是中国人群２ 型糖尿病肾病的独立危险因素之一。     

血管紧张素原基因M235T分子变异与型糖尿病肾病的关系

目的 探讨血管紧张素原ａｎｇｉｏｔｅｎｓｉｎｏｇｅｎ,ＡＧＴ）基因Ｍ２３５Ｔ分子变异与中国人无肾病并发症的２型糖尿病（ｄｉａｂｅｔｅｓ ｍｅｌｌｉｔｕｓ,ＤＭ）、２型糖尿病肾病（ｄｉａｂｅｔｉｃ ｎｅｐｈｒｏｐａｔｈｙ,ＤＮ）的关系。方法用ＰＣＲ及ＲＦＬＰ方法对８４例ＤＭ、９６例ＤＮ及９８名正常对照进行了ＡＧＴ基因Ｍ２３５Ｔ多态性的检测。结果 ＤＮ组Ｔ等位基因频率０．８２,ＴＴ基因型频率０．７０