定量荧光多重PCR快速诊断21-三体

目的 探讨多重定量荧光PCR(QF-PCR)技术在快速诊断21-三体中的应用价值.方法 抽取外周血样本90份,其中21-三体患者22例,经常规染色体核型分析排除21-三体的患者68例,包括智低儿,正常体检者,染色体平衡易位携带者,有流产史的夫妇,其中45,X;45,X/46,X,del(X);46,XX,t(4;13)各1例,47,XXY 3例.应用QF-PCR方法进行多重扩增,毛细管电泳法检测并分析结果.所有样本同时进行染色体核型分析.结果 染色体核型分析中阳性组中有22例21-三体(其中有3例是易位型,46,XX(Y),t(21;21)各1例,46,XX,dup(21)1例,余为标准型);21例显示21-三体电泳图谱,68例阴性对照组全部显示为阴性结果.结论 成功建立了QF-PCR诊断21-三体染色体异常疾病的方法.定量荧光PCR诊断结果与染色体核型诊断结果具有同一性.     

实时荧光定量PCR快速分子诊断唐氏综合征

目的　探讨快速诊断唐氏综合征的检测方法 .方法　采用实时荧光定量PCR技术 ,检测唐氏患者 2 3例、正常人 33例 ,定量分析比较ΔCt值 .结果　正常组和唐氏组ΔCt值有显著性差异 (p <0 .0 0 1) ,并建立了相应的参考值范围 .结论　实时荧光定量PCR具有简单、快速、特异性高等优点 ,可用于快速诊断唐氏综合征     

实时荧光定量PCR快速分子诊断唐氏综合征

目的探讨快速诊断唐氏综合征的检测方法.方法采用实时荧光定量PCR技术,检测唐氏患者23例、正常人33例,定量分析比较ΔCt值.结果正常组和唐氏组ΔCt值有显著性差异(p<0.001),并建立了相应的参考值范围.结论实时荧光定量PCR具有简单、快速、特异性高等优点,可用于快速诊断唐氏综合征.     

荧光定量PCR产前快速诊断唐氏综合征

目的探索荧光定量PCR方法在产前快速诊断唐氏综合征中的作用。方法收集65例妊娠20~24w,进行羊水穿刺胎儿细胞培养染色体核型分析的胎儿羊水,采用荧光定量PCR技术对标本D21S11位点进行PCR扩增、检测,并与染色体核型分析的结果进行对照分析。结果65例未培养羊水标本经过荧光定量PCR检测,发现2例唐氏综合征,显示1:1:1三条或2:1两条D21S11位点等位基因带,63例显示1:1两条带;与细胞培养染色体核型分析的结果基本一致。结论荧光定量PCR技术具有检测速度快、需要模板量少,检测结果准确等特点,可用于染色体异常的产前快速诊断。     

利用双色实时荧光定量PCR法快速进行产前诊断

目的利用双色实时荧光定量PCR法进行21-三体与18-三体的快速产前诊断。方法分别以21号的APP基因与18号染色体的TYMS基因为目的基因设计引物和不同荧光标记的Taqman探针,以相对定量指标△CT值判断21号与18号染色体的数目;并将其检测结果与传统染色体核型分析方法进行对比。结果60例羊水细胞区分出了4例21-三体,3例18三体标本,正常人的△CT值为-0．89±0．22,21-三体患者及18-三体患者的ACT值分别-0．04±0．17和-1．55±0．24,患者与正常人标本组之间无交叉重叠,均有明显差异（P〈0．001）。结论实验建立的双重实时荧光定量PCR能用于快速诊断羊水细胞的21-三体和18-三体等非整倍体。     

两种快速诊断21三体综合征的方法

目的利用间期FISH技术和PCR相关技术,探讨它们在快速诊断 21三体综合征中的应用;方法一是对观察组患者外周血淋巴细胞进行间期FISH 检测,观察细胞核内杂交信号数目;二是对观察组21号染色体上的两个短串联重复多态性位点(D21S 1446和D21S1435),进行PCR扩增,观察聚丙烯酰胺凝胶电泳中特异性扩增条带数目和密度 .结果观察组患者外周血淋巴细胞核中杂交信号数目比重和其两个多态性位点扩增后条带数目与密度与对照组相比均有显著性差异;结论利用间期FISH技术和短串联重复标志多态性可以快速简便准确诊断21三体综合征.     

孪生姐妹同患21三体综合征

病例 :例 1,女 ,5小时 ,因哭声弱 ,反应差 5小时入院。患儿系Ｇ3 Ｐ1,双胎之大 ,孕 35周早产 ,且母有妊高征史。父 :30岁 ,母 :2 4岁 ,父母非近亲结婚。双方家庭亦无类似疾病史。入院体检 :体重 16 0 0ｇ ,神清、反应差 ,呼吸平 ,皮肤干燥 ,愚型貌 ,唇无绀 ,双肺呼吸音粗 ,心率     

应用实时荧光定量PCR快速分子诊断唐氏综合征

目的探讨一种快速、准确诊断唐氏综合征的方法。方法采用实时荧光定量PCR技术，对25例唐氏患者、50名正常人外周血标本，扩增21号及1号、19号染色体上的多态位点，定量分析比较正常组及唐氏患者组的4对△Ct值。结果唐氏患者组△Ct值明显低于正常组，两组比较差异有统计学意义（P〈0．001）。初步建立了临床应用的参考值范围，可以有效区分出唐氏样本和正常样本。结论应用实时荧光定量PCR技术可快速、准确诊断唐氏综合征，为唐氏综合征的快速产前诊断开辟了新的途径。     

产前诊断21三体综合征的临床分析

目的通过对产前诊断中21三体综合征进行临床分析,了解孕龄、唐氏征筛查、家族遗传史及B超异常对21三体综合征发生的影响。方法收集我院2005年至今羊水穿刺产前诊断标本共3960例,其中21三体综合征43例,通过对43例孕妇从发病年龄、家族遗传史、唐氏征筛查及B超异常来综合分析21三体综合征的发生情况。结果 43例21三体综合征中：年龄≥34岁18例,占41.9%;唐筛阳性15例,占34.9%;遗传病史6例,占13.9%;B超异常4例,占9.3%。结论加强对有产前诊断指征孕妇进行必要的产前诊断,可减少21三体综合征患儿的出生;加强宣传,提高孕妇、家庭及社会的对羊水产前诊断的认识。     

21三体综合征的快速基因诊断

目的探讨一种快速、简便、准确检测21三体综合征的基因诊断方法。方法选用位于21号染色体Down′s综合征核心区（21q21-21q22）内及其附近的短串联重复序列（STR）（D21S1432,D21S11,D21S1436,D21S1442,D21S1270,D21S1411,D21S1446）,建立STR-PCR快速诊断平台。通过对经染色体核型分析的10例正常胎儿的羊水脱落细胞DNA,及4例判定为21三体综合征胎儿的绒毛组织DNA进行21号染色体STR分析,从而进行方法评价。结果在上述7个STR位点中,10名正常胎儿除在D21S1436位点存在2∶1条带的占5/10,其余位点杂合度（64.29%-92.86%）及相互间的符合率为100%。4例21三体胎儿经6个STR位点联合分析,均被确诊为21三体综合征。结论6个STR位点（D21S1432,D21S11,D21S1442,D21S1270,D21S1411,D21S1446）可作为21三体综合征有价值的遗传标记,可用于对其做出快速、准确的基因诊断。     

Rapid prenatal diagnosis of trisomy 21 by real-time quantitative polymerase chain reaction with amplification of small tandem repeats and S100B in chromosome 21

Trisomy 21 (Down syndrome) is the most common congenital anomaly, and it occurs in one out of 700-1000 births. Current techniques such as amniocentesis and chorionic villi sampling (CVS) require lengthy laboratory culture procedures and high costs. This study was undertaken to establish a rapid prenatal diagnosis of trisomy 21 using real-time quantitative polymerase chain reaction (PCR) of fetal DNA from amniotic fluid. Real-time quantitative PCR was performed with DNA templates obtained from 14 normal blood samples, 10 normal amniotic fluid samples, 14 Down syndrome blood samples, and 7 Down syndrome amniotic fluid samples. Primers for D21S167 and S100B of chromosome 21 were used. Primers that direct the amplification of the 165-bp fragment of the insulin-like growth factor (IGF)-1 gene on chromosome 12 using a PCR primer were included to generate an internal standard for quantitation. The relative levels of D21S167 and S100B were 2.6 and 2.4 times higher in the blood of Down syndrome patients than those in the control group. The differences between these two groups were statistically significant (p-values were 0.0012 and 0.0016, respectively). The relative levels of D21S167 and S100B were 2.1 and 2.7 times higher in the amniotic fluid of Down syndrome fetuses than those in the control group. The difference between these two groups was statistically significant (p-values were 0.0379 and 0.0379, respectively). Prenatal diagnosis of trisomy 21 by real-time quantitative PCR using STR (small tandem repeats) amplification of D21S167 and S100B is a useful, accurate and rapid diagnostic method. Furthermore, it may also be useful for prenatal diagnosis with fetal DNA from maternal blood, and for preimplantation genetic diagnosis and prenatal counseling.     

应用定量PCR方法快速基因诊断Down综合征

目的探讨用定量聚合酶链反应方法对Ｄｏｗｎ综合征进行基因诊断。方法以短串联重复序列（Ｄ２１Ｓ１１）作为遗传标记,合成特异引物,用同位素标记聚合酶链反应扩增后对１１名正常人（６例外周血,５例羊水）及２８例Ｄｏｗｎ综合征患者（外周血）进行定量检测。结果１１名正常人中１０人出现ＤＮＡ含量为１∶１关系的２条电泳带,１人为１条带。２８例患者中２４人出现ＤＮＡ含量２∶１的２条带,３人为ＤＮＡ含量为１∶１∶１的３条带,１人为１条带。结论Ｄ２１Ｓ１１位点短串联重复序列多态是对Ｄｏｗｎ综合征基因诊断很有应用价值的遗传标记,应用定量聚合酶链反应方法可在２４小时内对Ｄｏｗｎ综合征做出快速、准确的产前及临床基因诊断。     

D21S11位点定量PCR快速基因诊断先天愚型

为了探讨定量ＰＣＲ方法在分子水平对Ｄｏｗｎ 综合征基因诊断意义,本实验以ＳＴＲ（Ｄ２１Ｓ１１） 做为遗传标记,合成特异引物对１１ 例正常人（６ 例外周血,５ 例羊水）及２８ 例先天愚型患者外周血进行同位素标记ＰＣＲ 扩增后定量分析,结果显示１１ 例正常人中１０ 人呈ＤＮＡ 含量为１ ：１ 关系的两条电泳带,１ 人为１ 条带。２８ 例患者中２４ 人呈ＤＮＡ含量为２ ：１ 的两条带,３ 人为ＤＮＡ 含量为１ ：１：１ 关系的三条带,１ 人为１ 条带。实验表明Ｄ２１Ｓ１１ 位点ＳＴＲ多态是对Ｄｏｗｎ 综合征基因诊断很有应用价值的遗传标记,应用定量ＰＣＲ的方法可在２４ 小时内对先天愚型做出快速、准确的产前及临床基因诊断。     

多重实时定量PCR快速诊断唐氏及爱德华综合征

目的 建立多重实时定量聚合酶链反应(real-time quantitative polymerase chain reaction,RTqPCR)技术,快速分子诊断唐氏及爱德华综合征.方法 应用PCR方法同时扩增位于21号染色体上的淀粉样前蛋白基因(amyloid precursor protein gene,APP)和18号染色体上的胸苷酸合成酶基因(thymidylate synthetase gene,TYMS),以相对定量指标△CT值区分唐氏、爱德华综合征及正常人.用此方法检测4组样本:36名正常人外周血(A组)、15名正常核型的羊水细胞(B组)、21例唐氏综合征(C组)和6例爱德华综合征(D组).结果 A～D 4组样本△CT均值分别为-0.48±0.15、-0.49±0.12、-1.26±0.17和0.25±0.12.B组与A组间差异无统计学意义(P＞0.05);C组与A组、D组与A组间差异有统计学意义(P＜0.01),且无交叉重叠.结论 多重实时荧光定量PCR技术同时快速诊断唐氏及爱德华综合征是可行的.     

应用荧光定量PCR检测缺失型DMD携带者的研究

目的建立荧光定量PCR技术检测缺失型DMD携带者.方法应用9对引物扩增抗肌萎缩蛋白缺失热点区域,检测出常见的缺失型DMD患儿17例.用SYBR Green Ⅰ荧光定量PCR技术对缺失型DMD患儿家系中21例女性亲属进行检测.结果1例肯定携带者、11例可疑携带者和3例可能携带者证实为携带者;5例可疑携带者和1例可能携带者被排除.结论SYBR Green Ⅰ荧光定量PCR技术是一种检测缺失型DMD携带者的准确、快速、简便的方法.     

Rapid detection of chromosome aneuploidies by quantitative fluorescence PCR: first application on 247 chorionic villus samples

We report the results of the first major study of applying quantitative fluorescence polymerase chain reaction (QF-PCR) assays for the detection of major chromosome numerical disorders. The QF-PCR tests were performed on a total of 247 chorionic villus samples, which were analysed blind, without any knowledge of the results obtained using conventional cytogenetic analysis. The aims of this investigation were to evaluate the detection power and accuracy of this approach by testing a large number of fetal samples and to assess the diagnostic value of each of the chromosome specific small tandem repeat (STR) markers used. In addition, we introduced three more markers specific for chromosomes 13, 18, and X to allow an accurate analysis of samples homozygous for a particular STR. Fluorescent labelled primers were used to amplify 12 STRs specific for chromosomes 21, 18, 13, X, and the amylogenin-like DNA sequence AMXY, expressed on the X and Y chromosomes. In this blind study of 247 fetal samples, 222 were correctly diagnosed by QF-PCR as normal for each of the five chromosomes investigated; 20 were diagnosed by QF-PCR as trisomic for chromosomes 21, 18, or 13, in agreement with the cytogenetic tests. Only one false negative result was observed, probably owing to the mishandling of the sample, which had been transferred through three laboratories before being analysed by QF-PCR. The 247 samples also included four cases of mosaicism or translocation; one case of mosaic trisomy 21 was detected by QF-PCR and the other cases were not identified by QF-PCR. The results of this investigation provide clear evidence that the QF-PCR assays are powerful adjuncts to conventional cytogenetic techniques and can be applied for the rapid and accurate prenatal diagnosis of the most frequent aneuploidies.