Objective： To obtain high quality of mitochondrial DNA （mtDNA） and carry out extra-long PCR （XL-PCR）. Methods： Mitochondria were isolated by differential centrifugation, and membranes were disrupted using 10%SDS...Objective： To obtain high quality of mitochondrial DNA （mtDNA） and carry out extra-long PCR （XL-PCR）. Methods： Mitochondria were isolated by differential centrifugation, and membranes were disrupted using 10%SDS （pH 7.0）. mtDNA was then extracted using phenol and chloroform. Resuits： The mtDNA obtained by using our improved method can be used as effective template for XL-PCR, and total mtDNA （16 kb） can be amplified easily. Conclusion： Our improved method is effective in preparing high quality of mtDNA, which can be used as template for XL-PCR.展开更多
Alterations of mitochondria DNA(mtDNA)4977 bp common deletion(CD)and mtDNA copy number induced by ionizing radiation were observed in human different cell lines and total body irradiation patients.However,only few exp...Alterations of mitochondria DNA(mtDNA)4977 bp common deletion(CD)and mtDNA copy number induced by ionizing radiation were observed in human different cell lines and total body irradiation patients.However,only few experiments have evaluated the levels of the CD and mtDNA copy number in human peripheral blood exposed to ionizing radiation till now.The aim of this study is to analyze the mtDNA alterations in irradiated human peripheral blood from healthy donors as well as to explore their feasibility as biomarkers for constructing new biodosimeter.Peripheral blood samples were collected from six healthy donors,and exposed to 60Co gamma ray with the doses of 0 Gy,1 Gy,2 Gy,3 Gy,4 Gy and 5 Gy.Levels of the CD and mtDNA copy number in irradiated samples after 2h or 24h incubation were detected using TaqMan real-time PCR,and the CD ratio was calculated.The results showed that the mean of the CD ratio and the CD copy number exhibited a dose-dependent increase 2 h in the dose range from 0–5 Gy,and of the mtDNA copy number significantly increased 24 h in irradiated groups compared with 0 Gy group after irradiation.It indicates that the parameters in human peripheral blood may be considered as molecular biomarkers to applying construction of new biodosimeter.展开更多
基金Supported by the National Natural Science Foundation of China (No. C30171030, C30472175)China Postdoctoral Science Foundation (No. 2004036014)
文摘Objective： To obtain high quality of mitochondrial DNA （mtDNA） and carry out extra-long PCR （XL-PCR）. Methods： Mitochondria were isolated by differential centrifugation, and membranes were disrupted using 10%SDS （pH 7.0）. mtDNA was then extracted using phenol and chloroform. Resuits： The mtDNA obtained by using our improved method can be used as effective template for XL-PCR, and total mtDNA （16 kb） can be amplified easily. Conclusion： Our improved method is effective in preparing high quality of mtDNA, which can be used as template for XL-PCR.
基金Supported by grants from the building project for the National Key Clinical Special Department of China(No.2011-17)the Medical Science and Technology Foundation of Henan Province(No.201204123)the Priority Academic Program Development of Jiangsu Higher Education Institutions
文摘Alterations of mitochondria DNA(mtDNA)4977 bp common deletion(CD)and mtDNA copy number induced by ionizing radiation were observed in human different cell lines and total body irradiation patients.However,only few experiments have evaluated the levels of the CD and mtDNA copy number in human peripheral blood exposed to ionizing radiation till now.The aim of this study is to analyze the mtDNA alterations in irradiated human peripheral blood from healthy donors as well as to explore their feasibility as biomarkers for constructing new biodosimeter.Peripheral blood samples were collected from six healthy donors,and exposed to 60Co gamma ray with the doses of 0 Gy,1 Gy,2 Gy,3 Gy,4 Gy and 5 Gy.Levels of the CD and mtDNA copy number in irradiated samples after 2h or 24h incubation were detected using TaqMan real-time PCR,and the CD ratio was calculated.The results showed that the mean of the CD ratio and the CD copy number exhibited a dose-dependent increase 2 h in the dose range from 0–5 Gy,and of the mtDNA copy number significantly increased 24 h in irradiated groups compared with 0 Gy group after irradiation.It indicates that the parameters in human peripheral blood may be considered as molecular biomarkers to applying construction of new biodosimeter.
