目的:探讨用双色荧光原位杂交技术(dual-color fluorescence in situ hybridization,D-FISH)检测性染色体数目异常的实验方法及其应用价值。方法:以Biotin标记的X染色体α-卫星DNA(pBamX7)探针和以Digoxigenin标记的Y染色体长臂末端重...目的:探讨用双色荧光原位杂交技术(dual-color fluorescence in situ hybridization,D-FISH)检测性染色体数目异常的实验方法及其应用价值。方法:以Biotin标记的X染色体α-卫星DNA(pBamX7)探针和以Digoxigenin标记的Y染色体长臂末端重复顺序(pY3.4)探针与经处理的标本同时进行外周血染色体及间期细胞核的原位杂交,分别用Avidin-FITC和Rhodamine-FITC及其Anti-avidin进行信号的检测与放大,DAPI复染。于Olympus AX-70型荧光显微镜下,分别通过WIB、WIG及其WU滤光镜观察杂交信号及其染色体或间期核背景,并统计外周血中期染色体和间期细胞核的杂交信号颗粒数。结果:在显微镜下可见以Biotin标记的pBamX7探针显示4个绿色杂交信号,以Digoxigenin标记的pY3.4探针显示1个红色杂交信号,染色体或细胞质背景经DAPI复染显示兰色;统计350个中期染色体和间期细胞核,X染色体杂交信号阳性率分别为91.43％和92.57％;Y染色体杂交信号阳性率分别为99.5％和99.8％。结论:双色荧光原位杂交技术是检测49,XXXXY性染色体异常以及其他性染色体数目异常患者的一种十分有价值的技术,具有高效、灵敏、可靠等特点,可为临床提供良好的辅助诊断。展开更多
Prorocentrum donghaiense is a dinoflagellate that is widely distributed in the East China Sea and has become increasingly involved in Harmful Algal Blooms (HABs). Therefore, it is necessary to study this dinoflagellat...Prorocentrum donghaiense is a dinoflagellate that is widely distributed in the East China Sea and has become increasingly involved in Harmful Algal Blooms (HABs). Therefore, it is necessary to study this dinoflagellate to monitor HABs. In this study, 13 pairs of primers specific to P. donghaiense (within its internal transcribed spacer (ITS) regions) were designed for SYBR Green I real-time PCR. As the SYBR Green I real-time PCR could not identify P. donghaiense in a specific manner, a Taqman real-time PCR method was developed by designing a set of specific primers and a Taqman probe. A 10-fold serial dilution of recombinant plasmid containing ITS regions of P. donghaiense was prepared as standard samples and the standard curve was established. Additionally, we quantified the genomic DNA in P. donghaiense cells and utilized this DNA to prepare another 10-fold serial dilution of standard sample and accordingly set up the standard curve. The mathematic correlation between the cell number and its corresponding plasmid copy number was also established. In order to test the efficiency of the real-time PCR method, laboratory samples and P. donghaiense HAB field samples were employed for identification and quantitative analysis. As to laboratory samples, as few as 102 cells of P. donghaiense could be quantified precisely utilizing both centrifugation and filtration techniques. The quantification results from field samples by real-time PCR were highly similar to those by light microscopy. In conclusion, the real-time PCR could be applied to identify and quantify P. donghaiense in HABs.展开更多
基金supported by the National Basic Research Program of China (973 Program) (No.2011CB403602)the National High Technology Research and Development Program of China (863 Program) (No.2007AA09200111)the National Marine Public Welfare Research Project (201205031-02)
文摘Prorocentrum donghaiense is a dinoflagellate that is widely distributed in the East China Sea and has become increasingly involved in Harmful Algal Blooms (HABs). Therefore, it is necessary to study this dinoflagellate to monitor HABs. In this study, 13 pairs of primers specific to P. donghaiense (within its internal transcribed spacer (ITS) regions) were designed for SYBR Green I real-time PCR. As the SYBR Green I real-time PCR could not identify P. donghaiense in a specific manner, a Taqman real-time PCR method was developed by designing a set of specific primers and a Taqman probe. A 10-fold serial dilution of recombinant plasmid containing ITS regions of P. donghaiense was prepared as standard samples and the standard curve was established. Additionally, we quantified the genomic DNA in P. donghaiense cells and utilized this DNA to prepare another 10-fold serial dilution of standard sample and accordingly set up the standard curve. The mathematic correlation between the cell number and its corresponding plasmid copy number was also established. In order to test the efficiency of the real-time PCR method, laboratory samples and P. donghaiense HAB field samples were employed for identification and quantitative analysis. As to laboratory samples, as few as 102 cells of P. donghaiense could be quantified precisely utilizing both centrifugation and filtration techniques. The quantification results from field samples by real-time PCR were highly similar to those by light microscopy. In conclusion, the real-time PCR could be applied to identify and quantify P. donghaiense in HABs.
