Clinical and molecular genetic analysis for 7 patients from 5 pedigrees with 17α-hydroxylase/17, 20 lyase deficiency

Objective To investigate the clinical and genetic characteristics of 7 patients from 5 families with 17α-hydroxylase/17, 20 lyase deficiency (17OHD) and the CYP17A1 mutation in Chinese. Methods Clinical features and laboratory data were collected from 5 families with 17OHD. PCR direct sequencing was performed to screen the mutation of CYP17A1 gene of the patients. Polymerase chain reaction-restriction fragment length polymorphism(PCR-RFLP) and sequencing were performed to screen the mutations of CYP17A1 gene in 288 healthy individuals from Shandong province. Results Seven patients (5 of them were 46, XX; 2 were 46, XY) had typical clinical presentation of sexual infantilism, hypertension and hypokalemia. Hormone profile indicated decreased plasma cotisol and sex hormones, and elevated blood adrenocorticotrophic hormone (ACTH). TAC329AA and H373L in exon 6 and D487_ F489del in exon 8 were identified from the patients. One heterozygote for D487_F489del was identified in 288 healthy controls. Conclusion The TAC329AA and D487_F489del of the CYP17A1 gene were the most frequent mutations in Chinese with 17OHD. There might be certain frequency of heterozygotes for D487_ F489del in Chinese population.     

多重巢式和定量PCR联合应用提高SARS病毒检测率

目的寻求一种可靠、可行的对急性严重呼吸道综合征病毒的早期诊断方法。方法应用多重巢式PCR联合荧光实时定量方法，对广州地区91份确诊和疑似病例标本、25份健康志愿者标本同时进行检测。结果25份健康志愿者标本经两种方法检测均为阴性。91份确诊和疑似病例标本经多重巢式PCR方法检测，阳性标本数53例，总阳性检测率58．24％；荧光实时定量PCR检测阳性标本数68例，阳性检出率74．73％；两种方法联合，阳性标本数76例，阳性检出率83．52％。结论多重巢式PCR联合荧光实时定量方法可进一步提高SARS病毒的阳性检出率，也为今后应对可能发生的其它突发性传染病病毒的检测提供分子诊断基础。     

Clinical and molecular genetic analysis for 7 patients from 5 pedigrees with 17α-hydroxylase/17, 20 lyase deficiency

Objective To investigate the clinical and genetic characteristics of 7 patients from 5 families with 17α-hydroxylase/17, 20 lyase deficiency (17OHD) and the CYP17A1 mutation in Chinese. Methods Clinical features and laboratory data were collected from 5 families with 17OHD. PCR direct sequencing was performed to screen the mutation of CYP17A1 gene of the patients. Polymerase chain reaction-restriction fragment length polymorphism(PCR-RFLP) and sequencing were performed to screen the mutations of CYP17A1 gene in 288 healthy individuals from Shandong province. Results Seven patients (5 of them were 46, XX; 2 were 46, XY) had typical clinical presentation of sexual infantilism, hypertension and hypokalemia. Hormone profile indicated decreased plasma cotisol and sex hormones, and elevated blood adrenocorticotrophic hormone (ACTH). TAC329AA and H373L in exon 6 and D487_ F489del in exon 8 were identified from the patients. One heterozygote for D487_F489del was identified in 288 healthy controls. Conclusion The TAC329AA and D487_F489del of the CYP17A1 gene were the most frequent mutations in Chinese with 17OHD. There might be certain frequency of heterozygotes for D487_ F489del in Chinese population.     

2型糖尿病药物治疗的分子机制

随着世界范围内2型糖尿病的流行与人口老龄化,以胰岛素分泌不足和伴胰岛素抵抗为主要致病机制的2型糖尿病已成为国内外研究热点.但是许多现有的2型糖尿病的药物治疗的分子机制尚不明确.随着分子生物学研究的开展及对2型糖尿病发病关键机制的认识加深:葡萄糖依赖的胰岛素分泌功能受损、脂毒性、肌肉组织的胰岛素抵抗逐渐成为药物治疗的靶点.     

一例Ⅰ型成骨不全家系的基因定位及突变检测

目的对国内1例成骨不全(OI)家系进行基因突变及突变效应分析,为研究中国人群的成骨不全基因突变特点提供线索。方法对成骨不全Ⅰ型胶原基因COL1A1和COL1A2所在的17号染色体和7号染色体分别进行连锁分析,对致病基因做初步判断,然后用聚合酶链反应扩增致病基因外显子,并测序检出基因突变。结果该家系为COL1A1基因突变,所有患者在该基因的第8个内含子剪切受体位点处为AG→GG(IVS8-2A>G)突变。结论对比COL1A1基因突变数据库,该突变为一新发现突变。     

上海地区绝经后妇女Ⅰ型胶原α1基因多态性与骨密度无关

目的研究上海地区205名绝经后妇女Ⅰ型胶原α1(COLIA1)基因Sp1结合位点的多态性变化与骨密度的关系.方法用PCR-RFLP法检测COLIA1基因多态性,基因型中的大写和小写字母(S和s)分别表示无和有限制性内切酶位点.以双能X线骨密度仪测定腰椎和股骨颈等处骨密度.结果所有样本均为SS基因型,没有发现Ss和ss型.结论 COLIA1基因多态性可能有较大的种族差异,与上海地区绝经后妇女的骨密度无关.该基因对骨密度和骨质疏松症的影响尚需在不同人群中进一步研究.     

2004年SARS-CoV毒株S基因分子进化特征

目的通过对2004年SARS-CoV毒株S基因序列的变异分析,揭示SARS-CoV毒株S基因进化与SARS流行的关系。方法对广东地区2004年2株SARS-CoV毒株S基因进行序列分析,其余15株毒株S基因序列从GenBank检索,采用DNAStar5.0软件,对检索的SARS-CoV的S基因核苷酸序列进行比对和分析;并结合临床资料对变异毒株进行进化速度分析。结果17株毒株中,S基因7个氨基酸位点全部置换,35个氨基酸位点在不同毒株中置换;所有SARS-CoV均通过氨基酸227位点的置换,增加一个糖基化位点。同义进化中,S基因置换速度为1.46×10-6个核苷酸,进化线性回归方程为Y=1.46×10-6X+0.000736,同时通过Ka计算显示S基因进化明显存在选择性压力。2004年17株SARS-CoV毒株可以分为两条进化途径,其中广东地区的人类的GZ0401毒株与果子狸的PC4-115毒株核苷酸同源性达到99.97%,氨基酸同源性为100%。结论冠状病毒S基因的1个糖蛋白位点增加,可能导致人类SARS-CoV毒株出现并SARS流行;2004年果子狸冠状病毒与人类SARS-CoV毒株分子结构类似,可能存在交叉宿主。S基因同义进化速度较流感HA1基因慢4.2倍,但基因进化明显存在选择性压力。     

绝经后妇女护骨素基因G1181C多态性与骨密度变化相关

目的　寻找护骨素基因(OPG)外显子中的单核苷酸多态性 (SNP),并分析其与绝经后妇女骨密度的关系。方法　在 205名绝经后妇女中,采用PCR和直接测序法确定OPG基因的SNP及基因型。应用双能X线骨密度仪测定腰椎和股骨颈骨密度 (BMD)。同时检测血清骨钙素 (BGP)、尿Ⅰ型胶原交联N端肽(NTx),以及血清护骨素(OPG)和核因子κB受体活化子配体 (RANKL)。结果　在OPG基因第一外显子中发现一个G1181C的SNP,该SNP的基因型频率分布依次为GG型占 0. 566、GC型 0. 346、CC型0. 088。去除年龄和体重的影响后,CC型的腰椎BMD明显高于GC和GG型 (P<0. 05),多元回归分析提示OPG基因型与绝经后妇女腰椎、股骨颈BMD相关 (P<0. 01)。Logistic回归分析显示OPG基因是绝经后妇女发生骨量减少和骨质疏松的独立危险因子,GG型发生骨量减少和骨质疏松的危险是CC型的 2. 83倍(P<0. 05)。结论　OPG基因的G1181C多态性与绝经后妇女BMD存在一定的关联,CC型对绝经后妇女腰椎BMD具有保护作用。