Objective: To understand the role of mitochondrial DNA (mtDNA) in carcinogenesis. Methods: single-step method was used to isolate the mtDNA from human lung adenocarcinoma cell line SPC-A-1. The mtDNA was analyzed by r...Objective: To understand the role of mitochondrial DNA (mtDNA) in carcinogenesis. Methods: single-step method was used to isolate the mtDNA from human lung adenocarcinoma cell line SPC-A-1. The mtDNA was analyzed by restriction fragment length polymorphism (RFLP) with 11 kinds of restriction endonuclease, which were Pvu II, Xho I, Pst I, EcoR I, BstE II, Hind III, Hpa I, Bc1 I, EcoR V, Sca I and Xba I. Restriction map of mtDNA from SPC-A-1 cell was obtained by the single and double-digestion method. Results: It was found that no variation at 32 restriction-sites could be detected in the coding region of mtDNA from SPC-A-1 cell line. But a new site was found at nucleotide 16276 (EcoR V) within the noncoding region. Conclusion: These results indicate that the primary structure of gene coding region of mtDNA isolated from SPC-A-1 cell is highly stable. While the major variation of nucleotide is probably located in the noncoding region.展开更多
目的：综合评价DNA修复基因XRCC1（X-ray cross-complementing group 1）的399位点多态性同肺癌易感性的关系。方法：检索中国生物医学数据库和Medline，获得有关XRCC1基因399位点多态性同肺癌易感性关系的研究结果，并进行Meta分析。...目的：综合评价DNA修复基因XRCC1（X-ray cross-complementing group 1）的399位点多态性同肺癌易感性的关系。方法：检索中国生物医学数据库和Medline，获得有关XRCC1基因399位点多态性同肺癌易感性关系的研究结果，并进行Meta分析。所有文献均采用病例对照研究，以非条件Logistic回归校正年龄、性别和吸烟状况等混杂因素后的OR值为效应指标，对文献进行评价筛选、异质性检验。利用Meta分析软件Rev Man 4．2对各研究原始结果进行统计处理，并计算合并OR值及其95％可信区间。结果：本次Meta分析共纳入15项研究，累计病例6818例，对照7610例。Arg／Gln和Gln／Gln等位基因同Arg／Arg比较，OR值分别为0．99（95％ CI：0．91～1．06）和1．04（95％ CI：0．92～1．17），Z值分别为-0．37和0．67，对应的P值分别为0．71和0．50。结论：尚无足够证据证明DNA修复基因XRCC1的399位点多态性同肺癌易感性有关。展开更多
目的:肠道微生物的研究日益成为热点,如何获取高质量、较完整的肠道菌群基因组DNA是肠道微生物研究中的关键。本文通过对酚/氯仿法提取总DNA过程进行考察和优化,建立一种简便酚/氯仿抽提法。方法:考察和优化酚/氯仿法提取总DNA的过程,...目的:肠道微生物的研究日益成为热点,如何获取高质量、较完整的肠道菌群基因组DNA是肠道微生物研究中的关键。本文通过对酚/氯仿法提取总DNA过程进行考察和优化,建立一种简便酚/氯仿抽提法。方法:考察和优化酚/氯仿法提取总DNA的过程,并根据DNA产量、纯度以及ERIC-PCR及16S rNDA-RFLP所反映的微生物群落结构特性的指标,并与QIAamp?DNA Stool Mini Kit提取的进行比较,评价了所建立的快速提取方法。结果:用简便酚/氯仿法得到基本完整的基因组DNA,ERIC-PCR和16S rDNA-RFLP结果与QIAamp?DNA Stool Mini Kit法基本相同。结论:该方法快速并成本低,适合肠道微生物研究中总DNA提取,尤其适合处理大批量的样品。展开更多
文摘Objective: To understand the role of mitochondrial DNA (mtDNA) in carcinogenesis. Methods: single-step method was used to isolate the mtDNA from human lung adenocarcinoma cell line SPC-A-1. The mtDNA was analyzed by restriction fragment length polymorphism (RFLP) with 11 kinds of restriction endonuclease, which were Pvu II, Xho I, Pst I, EcoR I, BstE II, Hind III, Hpa I, Bc1 I, EcoR V, Sca I and Xba I. Restriction map of mtDNA from SPC-A-1 cell was obtained by the single and double-digestion method. Results: It was found that no variation at 32 restriction-sites could be detected in the coding region of mtDNA from SPC-A-1 cell line. But a new site was found at nucleotide 16276 (EcoR V) within the noncoding region. Conclusion: These results indicate that the primary structure of gene coding region of mtDNA isolated from SPC-A-1 cell is highly stable. While the major variation of nucleotide is probably located in the noncoding region.
文摘目的：综合评价DNA修复基因XRCC1（X-ray cross-complementing group 1）的399位点多态性同肺癌易感性的关系。方法：检索中国生物医学数据库和Medline，获得有关XRCC1基因399位点多态性同肺癌易感性关系的研究结果，并进行Meta分析。所有文献均采用病例对照研究，以非条件Logistic回归校正年龄、性别和吸烟状况等混杂因素后的OR值为效应指标，对文献进行评价筛选、异质性检验。利用Meta分析软件Rev Man 4．2对各研究原始结果进行统计处理，并计算合并OR值及其95％可信区间。结果：本次Meta分析共纳入15项研究，累计病例6818例，对照7610例。Arg／Gln和Gln／Gln等位基因同Arg／Arg比较，OR值分别为0．99（95％ CI：0．91～1．06）和1．04（95％ CI：0．92～1．17），Z值分别为-0．37和0．67，对应的P值分别为0．71和0．50。结论：尚无足够证据证明DNA修复基因XRCC1的399位点多态性同肺癌易感性有关。
文摘目的:肠道微生物的研究日益成为热点,如何获取高质量、较完整的肠道菌群基因组DNA是肠道微生物研究中的关键。本文通过对酚/氯仿法提取总DNA过程进行考察和优化,建立一种简便酚/氯仿抽提法。方法:考察和优化酚/氯仿法提取总DNA的过程,并根据DNA产量、纯度以及ERIC-PCR及16S rNDA-RFLP所反映的微生物群落结构特性的指标,并与QIAamp?DNA Stool Mini Kit提取的进行比较,评价了所建立的快速提取方法。结果:用简便酚/氯仿法得到基本完整的基因组DNA,ERIC-PCR和16S rDNA-RFLP结果与QIAamp?DNA Stool Mini Kit法基本相同。结论:该方法快速并成本低,适合肠道微生物研究中总DNA提取,尤其适合处理大批量的样品。
