多重连接探针扩增技术的研究进展及其应用

多重连接探针扩增技术(multiplex ligation-dependentprobe amplification,MLPA)是一种高通量、针对待测核酸中靶序列进行定性和定量分析的新技术。该技术仅需20ng/μlDNA,即可通过简单的杂合、连接、PCR扩增及电泳步骤,在同一反应管中对四十多个不同的靶基因进行检测和定量分析。这一技术最先于2002年由荷兰的Schouten等[1]报道。如今短短几年中,该技术已被欧洲、亚洲等几十个实验室采用。迄今为止,已有150多篇不同领域采用该技术方法的报道在重要刊物上发表。     

实时荧光聚合酶链反应结合融解曲线分析在α-地中海贫血基因诊断中的价值

目的建立自动化、高通量、准确快速检测缺失型α地中海贫血基因型的技术。方法运用SYBRGreen1和ABI7000热循环仪分别进行3个实时荧光定量聚合酶链反应(SYBRQPCR),同时进行融解曲线(D.C)和Tm值分析,根据特定Tm值对应的D.C峰值判定基因型,即以该峰值≥Cutoff值定为PCR结果阳性。将PCR产物重组到T载体,筛选到含正确扩增片段的克隆,以梯度稀释重组质粒DNA为模板,进行SYBRQPCR得出标准曲线。从而定量未知标本。结果优化了3个SYBRQPCR反应的引物及其浓度,热循环条件等。检测SEA等位基因的PCR产物长800bp,Tm=82.5℃±1℃。αα等位基因的PCR产物长206bp,Tm=83.0℃±1℃。非SEA等位基因的PCR产物长436bp,Tm=84.0℃±1℃。重组质粒拷贝数在1至105范围内,其对数值与CT值均呈良好线性关系。该检测技术的灵敏度较常规PCR结合琼脂糖凝胶电泳法高出16倍以上。联合运用3个SYBRQPCR反应可以为SEA缺失携带者、缺失型HbH病、非缺失型HbH病、α地贫2纯合子、Bart′s水肿胎儿综合征做出基因诊断,并可用于产前诊断。结论该技术具有自动化程度高、不需荧光标记探针、成本低、易质控、防污染、高通量等优点,适于临床推广应用。     

巨细胞病毒与动脉粥样硬化的临床研究

目的 研究巨细胞病毒和动脉粥样硬化的关系。方法 用ＰＣＲ的方法检查巨细胞病毒在颈内动脉、冠状动脉和血中的分布情况，并与健康人对照。结果 ８３．３％～８６．７％的动脉粥样硬化患者的动脉壁中存在巨细胞病毒，而非动脉粥样硬化患者的动脉壁中只有６．７％的标本中见巨细胞病毒，两者相差有高度显著性（Ｐ〈０．０１）；在４２．４％的动脉粥样硬化患者的血中查见世细胞病毒，而对照组中只有３％查到巨细胞病毒，两者相差有     

应用基因扩增转录测序技术诊断乙型血友病

作者运用基因扩增转录测序技术（ＧｅｎｏｍｉｃＡｍｐｌｉｆｉｃａｔｉｏｎＷｉｔｈＴｒａｎｓｃｒｉｐｔｓＳｅｑｕｅｎｃｉｎｇ，ＧＡＷＴＳ）完成３６例中国人乙型血友病患者第九因子（ＦＩＸ）基因突变类型的研究，发现中国人与美国白种人等该基因胚系突变图谱具有不同特点；并检出１７位女性缺陷基因携带者。证明ＧＡＷＴＳ是适用于乙型血友病基因诊断与携带者检出的好方法。     

急性白血病患者WT1基因表达的研究

检测了48例急性白血病(AL)患者骨髓或外周血单个核细胞(MNC)的WT1基因表达,现报告如下.     

Detection of factor Ⅷ intron 1 inversion in severe haemophilia A

Objective Screening the intron 1 inversion of factor Ⅷ (FⅧ) in the population of severe haemophilia A(HA) in China and performing carrier detection and prenatal diagnosis. Methods Using LD-PCR to detect intron 22 inversions and multiple-PCR within two tubes to intron 1 inversions in sereve HA patients. Carrier detection and prenatal diagnosis were performed in affected families. Linkage analysis and DNA sequencing were used to verify these tests. Results One hundred and eighteen patients were seven diagnosed as intron 22 inversions and 7 were intron 1 inversions out of 247 severe HA patients. The prevalence of the intron 1 inversion in Chinese severe haemophilia A patients was 2. 8% (7/247). Six women from family A and 2 from family B were diagnosed as carriers. One fetus from family A was affected fetus. Conclusion Intron 1 inversion could be detected directly by multiple-PCR within two tubes. This method made the strategy more perfective in carrier and prenatal diagnosis of haemophilia A.     

Detection of factor Ⅷ intron 1 inversion in severe haemophilia A

Objective Screening the intron 1 inversion of factor Ⅷ (FⅧ) in the population of severe haemophilia A(HA) in China and performing carrier detection and prenatal diagnosis. Methods Using LD-PCR to detect intron 22 inversions and multiple-PCR within two tubes to intron 1 inversions in sereve HA patients. Carrier detection and prenatal diagnosis were performed in affected families. Linkage analysis and DNA sequencing were used to verify these tests. Results One hundred and eighteen patients were seven diagnosed as intron 22 inversions and 7 were intron 1 inversions out of 247 severe HA patients. The prevalence of the intron 1 inversion in Chinese severe haemophilia A patients was 2. 8% (7/247). Six women from family A and 2 from family B were diagnosed as carriers. One fetus from family A was affected fetus. Conclusion Intron 1 inversion could be detected directly by multiple-PCR within two tubes. This method made the strategy more perfective in carrier and prenatal diagnosis of haemophilia A.     

重型血友病A凝血因子Ⅷ第1内含子倒位的基因检测

目的 在中国重型血友病A(haemophilia A,HA)患者中筛查凝血因子Ⅶ(factor Ⅷ,FⅧ)基因第1内含子倒位,并对受累患者家系成员行携带者检查和产前基因诊断.方法 对重型HA患者(F Ⅷ:C<1%)采用长距离PCR法首先筛查第22内含子倒位,对第22内含子倒位阴性的应用双管多重PCR法进行第1内含子倒位检测,对第1内含子倒位阳性患者的女性家属进行携带者检测,对女性携带者所孕胎儿进行产前检测.用基因连锁分析和DNA测序法加以验证.结果 从247例重型HA患者中共检测出118例第22内含子倒位和7例第1内含子倒位,第1内含子倒位突变在中国重型HA人群中的发病率约为2.8%;随访到的两个受累患者家系A和B中各检出6名和2名女性携带者,家系A中产前检出1名第1内含子倒位受累胎儿.结论 采用双管多重PCR法可以直接检测凝血因子Ⅷ第1内含子倒位突变,完善了重型血友病A家系携带者检测和产前诊断.     

四川地区α地中海贫血产前基因诊断

α地中海贫血（α地贫）可分为α地贫1（αα/--）、α地贫2（αα/α-）,缺失型或非缺失型HbH病和Hb Bart′s胎儿水肿综合征（--/--）四种类型。其中以Hb Bart′s胎儿水肿综合征最为严重,可致胎儿缺氧,引起死胎、死产或新生儿死亡,孕妇常有严重的妊娠中毒症及产后出血。因此,及早进行产前诊断,减少此类患儿出生是避免孕妇及其家庭痛苦的有效措施。 除非缺失型HbH病外,α地贫都是由于α基因缺失而致。这种缺失往往引起α基因内限制性内切酶位点的变化,故缺失型α地贫可采用直接检测胎儿DNA上限制性内切酶图谱的方法进行产前诊断。