共查询到19条相似文献,搜索用时 203 毫秒
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目的 探讨短串联重复序列(STR)信息位点的峰高与峰下面积在异基因造血干细胞移植后嵌合状态判断中的作用,寻找适合于异基因造血干细胞移植状态判断的指标.方法 分别采集两名无关供者及M2患者及其HLA全相合供者两组血标本,以白细胞含量为依据制备不同比例混合血样,提取DNA,使用STR试剂盒,建立PCR扩增体系,在ABI3100仪上检测扩增片段,筛选得到理想的信息位点,获取其峰高及峰面积进行移植嵌合率的计算.结果 各筛选位点以峰高或面积得出的模拟嵌合率间差异均无统计学意义,且各位点模拟嵌合率与制备的浓度梯度之间的相关系数均在0.9965以上.结论 峰高或峰下面积均可作为嵌合状态的定量监控指标. 相似文献
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母体血循环中胎儿游离DNA的检测 总被引:3,自引:0,他引:3
目的寻找一种无创性产前基因检测孕妇血浆中胎儿游离DNA的新方法。方法提取32名健康孕妇血浆标本中胎儿游离DNA,经套式聚合酶链反应(PCR)扩增其性别决定基因(sex-determiningregion Y,SRY),并引入内参照基因序列ArrLl;并采用16个短串联重复序列(shorttandemrepeat,STR)多态性位点的多重荧光PCR方法对血浆标本中DNA进行STR等位基因扩增。同时,检测孕妇及其丈夫的外周血白细胞DNA,进行基因扫描及对照分析。结果经SRY-PCR检测发现,17名妊娠男胎孕妇血浆中均出现基因扩增带,其余15名妊娠女胎孕妇中有2名出现假阳性,性别总符合率为94%(30/32)。经STR-PCR检测发现,均从孕妇血浆中检测出父源性胎儿DNA的存在。结论应用孕妇血浆中胎儿DNA作产前诊断准确性较高,是一种无创性产前基因诊断方法,具有广泛的临床应用前景。 相似文献
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本研究探讨检测孕妇血浆中游离胎儿DNA短串联重复序列(short tandem repeat,STR)多态位点作为内对照进行遗传病产前基因诊断的可行性。用QIAamp DNA Kit抽提孕妇血浆DNA,应用AmpFlSTR profiler试剂盒扩增9个(D3S1358,VWA,FGA,D5S818,D13S317,D7S820,D8S1179,D21S11,D18S51)具有高度多态性的STR位点,以多重荧光PCR方法对不同孕期的36份孕妇血浆标本中胎儿DNA进行STR等位基因扩增,同时扩增孕妇及丈夫外周血来源DNA的STR位点。PCR产物经ABI Prism 377序列分析仪电泳后,用基因扫描软件进行分析,以在孕妇血浆中胎儿DNA检出父源性STR等位基因来确认胎儿DNA存在。结果表明:其中孕早期4份(4/6)、孕中期19份(19/20)、孕晚期9份(9/10)样本中检出胎儿父源性等位基因,即胎儿DNA。4份样本未检到胎儿DNA。结论:应用多重荧光PCR方法对孕妇血浆中胎儿DNA进行STR多态位点的复合扩增,可获得男性及女性胎儿性别DNA信息,作为非性别依赖胎儿标记,从而用于无创伤性产前诊断。 相似文献
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OBJECTIVE: To evaluate the clinical significance of IgH and TCRgamma gene rearrangement in plasma free DNA in patients with non-Hodgkin Lymphoma (NHL). METHODS: Plasma free DNA in 74 patients with NHL were extracted and identified by Globin gene. IgH (FR3A/VLJH), TCRgamma (TVG/TJX) clonal rearrangements were amplified by PCR and compared with results of mononuclear cell DNA and pathological biopsy sample DNA. RESULTS: Plasma free DNAs were successfully obtained from 58 cases (35 B-NHL and 23 T-NHL) of newly diagnostic, refractory and relapsed NHL out of total 74 patients (78.4%), but not found in the rest 16 patients in remission. Of 35 B-NHL cases, 31 showed IgH rearrangement (88.6%), and none with TCRgamma rearrangement; of 23 T-NHL cases, 8 showed TCRgamma rearrangement (34.8%), and 2 with IgH gene rearrangement synchronously. In comparation with the results of IgH and TCRgamma gene rearrangement in biopsy samples in 30 B-NHL cases, 26 cases in plasma free DNA (86.7%) and 24 in biopsy samples (80%) were positive (P > 0.05). In 20 T-NHL patients, 7 cases in plasma cell-free DNA (35%) and 6 cases in biopsy samples (30%) were positive (P >0.05). CONCLUSIONS: Tumor-derived DNA could be detected in plasma from underlying cancer patients. For NHL patients, detecting IgH and TCRgamma gene rearrangement in plasma free DNA has the same clinical significance as in biopsy samples. 相似文献
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非霍奇金淋巴瘤患者血浆游离DNA IgH和TCRγ基因重排的检测及临床意义 总被引:1,自引:0,他引:1
目的 检测非霍奇金淋巴瘤(NHL)患者外周血血浆游离DNA免疫球蛋白重链(IgH)基因和T细胞受体γ(TCRγ)基因克隆性重排并探讨其临床意义.方法 提取74例NHL患者血浆游离DNA并以Globin基因确定其存在,通过PCR方法 检测IgH(FR3A/VLJH)和TCRγ(TVG/TJX)克隆性基因重排,并分别与外周血单个核细胞DNA、病理组织学检查进行比较.结果 74例患者中有58例(35例B-NHL和23例T-NHL)初诊、难治或复发的患者血浆游离DNA提取成功,另16例临床缓解患者未提取出血浆游离DNA.35例确诊的B-NHL患者中IgH基因单克隆重排阳性31例(88.6%),无一例出现TCRγ基因单克隆重排,23例确诊的T-NHL患者中TCRγ基因单克隆重排阳性8例(34.8%),其中2例同时出现IgH基因单克隆重排.在50例同时获得病理活检标本基因重排结果 的病例中,30例B-NHL患者血浆DNA IgH基因重排阳性26例(86.7%),病理活检标本阳性24例(80.0%)(P>0.05);20例T-NHL患者血浆DNA TCRγ基因重排阳性7例(35%),病理活检标本阳性6例(30%)(P>0.05).结论 NHL患者血浆中可以检测出肿瘤源性的血浆游离DNA;NHL患者血浆游离DNA IgH、TCRγ基因重排的检测简单、方便、相对无创,与病理活检标本的检测具有相同的临床意义. 相似文献
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Quantitation of genomic DNA in plasma and serum samples: higher concentrations of genomic DNA found in serum than in plasma 总被引:11,自引:0,他引:11
BACKGROUND: Plasma and serum samples have been used to detect cell-free genomic DNA in serum or plasma in certain pathologic conditions such as systemic lupus erythematosus, pulmonary embolism, and malignancies, as well as in fetal cell chimerisms in maternal serum and/or plasma. In this study, baseline concentrations of cell-free DNA in serum and plasma samples were evaluated for the study of posttransfusion chimerism. STUDY DESIGN AND METHODS: DNA was extracted from fresh or stored (4 degrees C for 1-6 days) normal donor serum or plasma samples (ACD; EDTA) by using reagents from an HIV assay kit. After incubation and washing of samples, purified DNA was amplified with HLA DQ-alpha primers (GH26 and 27) or human Y-chromosome primers (SA and SD) to quantitate the concentration of genomic DNA. RESULTS: Fresh serum samples had concentrations of cell-free DNA that were about 20-fold higher than the concentrations in fresh plasma samples. The concentration of cell-free genomic DNA in serum samples increased daily, to a level more than 100 times baseline after clotted blood tubes were stored at 4 degrees C for 4 to 5 days. There was a small increase in cell-free plasma DNA in stored ACD whole blood samples. Male WBCs, spiked into fresh nonanticoagulated female blood, were lysed during the process of clotting, with male DNA liberated into the serum samples. CONCLUSION: Most cell-free DNA in serum samples is generated during the process of clotting in the original collection tube. The concentration of cell-free genomic DNA in fresh plasma is probably the same as that in circulation. Consequently, while serum samples should not be used to monitor the concentration of cell-free DNA in a patient's circulation, serum collected from sample tubes containing clots (i.e., without anticoagulant), 3 to 5 days after the date of phlebotomy, could be useful as a source of DNA with which to screen for posttransfusion microchimerism. 相似文献
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Davanos N Spathas DH 《Clinica chimica acta; international journal of clinical chemistry》2011,412(17-18):1539-1543
BackgroundCell-free fetal DNA in maternal plasma presents interest as it can possibly serve as a pregnancy associated biomarker. For its quantitation, we investigate the use of fluorescent polymerase chain reaction (PCR) amplification of short tandem repeats (STRs) in pregnancies irrespective of sex.MethodsArtificially chimeric DNA samples were prepared so as to simulate cell-free fetal DNA in maternal plasma at different proportions. The samples were tested with fluorescent PCR amplification of informative STRs and the percentage of the population simulating fetal DNA was plotted against a relative ratio of the alleles detected in each sample. The graphs were used for the quantitation of cell-free fetal DNA in 50 maternal plasma samples.ResultsDetection of at least one paternally inherited fetal STR was possible in 46/50 pregnancies leading to the estimation of the relative percentage of cell-free fetal DNA. Four pregnancies failed to reveal any fetal allele which may reflect undetectable levels (< 1%) of fetal DNA. Among pregnancies fetal DNA ranged from 0 to 20% (mean value of 7%).ConclusionOur system can readily estimate the relative levels of cell-free fetal DNA in maternal circulation, normal gestations of either sex and can be exploited for estimating possible variations of this analyte between normal and pathological pregnancies. 相似文献
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BACKGROUND: The quantity of cell-free fetal DNA in the plasma of pregnant women changes during pregnancy and seems to be different in normal and pathologic pregnancies. We investigated the possible diagnostic applications of the detection and measurement of cell-free fetal DNA by comparing quantities found in women with ectopic (EP) or intrauterine (IUP) pregnancies. METHODS: We collected blood samples from 58 women who had positive pregnancy tests and specific complaints and sonographic findings suggestive of EP and from 45 women with confirmed IUP. We performed quantitative real-time PCR analysis of the sex-determining region Y (SRY) gene to detect and measure the amount of cell-free fetal DNA. The diagnosis of EP was confirmed by histologic examination. RESULTS: SRY was detected in 15 EP and 14 IUP cases. The mean (SD) amount of cell-free fetal DNA was significantly higher (P<0.005) in women with EP [565 (136) genome-equivalents (GE)/mL] than in women with IUP [72 (19) GE/mL] at the same gestational age. CONCLUSIONS: Our results confirm that cell-free fetal DNA is present in plasma of women with EP. The finding of higher amounts of cell-free fetal DNA in EP cases than in IUP cases suggests that this method might be useful for early diagnosis of EP. 相似文献
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