Aberrant DNA methylation of CpG sites has been confirmed to be closely associated with carcinogenesis.Based on the hyperbranched rolling circle amplification（HRCA） and microarray techniques,a new method for qualitat...Aberrant DNA methylation of CpG sites has been confirmed to be closely associated with carcinogenesis.Based on the hyperbranched rolling circle amplification（HRCA） and microarray techniques,a new method for qualitative detection of methylation was developed.In the present study,padlock probes hybridize the sample DNA at the methylation site to form a probe-DNA complex which is ligated and digested simultaneously by methylation specific enzymes.Only at the methylated CpG site is the padlock probe ligated successfully to form a circle template for the HRCA reaction.Utilizing the method of 3-dimensional polyacrylamide gel-based microarray,the HRCA product will be immobilized on the slide to form a DNA microarray,which can universally hybridize the Cy3-labeled oligonucleotide probe to detect the methylation status of CpG sites.To control the false positive signals,DNA ligase and temperature of ligation/digestion are optimized.Methylation status of four CpG sites located in P15,Ecadherin,hMLH1 and MGMT genes were analyzed successfully with this method and all the results were compatible with that of methylation-specific PCR.Our research proves that this method is simple and inexpensive,and could be applied as a high-throughput tool to qualitatively determine the methylation status of CpG sites.展开更多
近年来,食源性致病菌在全球范围内大面积传播,给人类的生存健康与发展带来了巨大的威胁。因此为了保证食品的安全,快速的、高特异性且高灵敏地检测食品致病菌方法已经成为科学研究的热点话题。在本研究中,我们构建了一种基于滚环扩增技...近年来,食源性致病菌在全球范围内大面积传播,给人类的生存健康与发展带来了巨大的威胁。因此为了保证食品的安全,快速的、高特异性且高灵敏地检测食品致病菌方法已经成为科学研究的热点话题。在本研究中,我们构建了一种基于滚环扩增技术的纸基显色传感器用于可视化检测致病菌的检测平台。通过滚环扩增对单增李斯特菌的hly A mRNA进行高效特异性扩增,扩增后的单链产物经过Hhal酶进行特异位点酶切后,形成与锁式探针长度相同的片段。将酶切后的单链产物不经过预变性杂交,可直接进行试纸条检测。在优化的实验条件下,可以检测到100 pg/μL总RNA。整个过程实验包括连接,扩增,酶切,检测等反应均可在恒温条件下进行,且可在几个小时内完成。这种方法适用于快速的现场检测,此外,这项研究强调了纸基显色诊断平台的潜在价值和应用前景。展开更多
滚环扩增(rolling circle amplification,RCA)是新近发展起来的一种恒温核酸扩增方法。这种方法不仅可以直接扩增DNA和RNA,还可以实现对靶核酸的信号放大,灵敏度达到一个拷贝的核酸分子,因此在核酸检测中具有很大的应用价值和潜力。本...滚环扩增(rolling circle amplification,RCA)是新近发展起来的一种恒温核酸扩增方法。这种方法不仅可以直接扩增DNA和RNA,还可以实现对靶核酸的信号放大,灵敏度达到一个拷贝的核酸分子,因此在核酸检测中具有很大的应用价值和潜力。本文结合了滚环扩增技术在医药领域中的最新研究进展,介绍了滚环扩增的原理及其在医药领域中的应用。展开更多
滚环扩增技术(rolling circle amplification,RCA)的建立模拟了自然界中环状病原生物DNA通过滚环模型方式自我复制的原理,经长期科学研究和实践应用,取得了诸多突破性成果。对最近几年在滚环扩增技术研究领域的最新动态进行了较全面的总...滚环扩增技术(rolling circle amplification,RCA)的建立模拟了自然界中环状病原生物DNA通过滚环模型方式自我复制的原理,经长期科学研究和实践应用,取得了诸多突破性成果。对最近几年在滚环扩增技术研究领域的最新动态进行了较全面的总结,其中包括了网状RCA、锁式探针RCA、目标成环RCA和跨越式RCA,也对滚环扩增中存在的问题进行了探讨,重点介绍了该技术在基础研究、实际检测、医疗诊断及纳米材料等方面的应用,最后对核酸等温扩增技术产业化的发展前景进行了展望。展开更多
基金supported by the Scientific Research Foundation of Mianyang Normal University(No.QD2012A10)Educational Commission of Sichuang Province,China(No.13ZB0275)
文摘Aberrant DNA methylation of CpG sites has been confirmed to be closely associated with carcinogenesis.Based on the hyperbranched rolling circle amplification（HRCA） and microarray techniques,a new method for qualitative detection of methylation was developed.In the present study,padlock probes hybridize the sample DNA at the methylation site to form a probe-DNA complex which is ligated and digested simultaneously by methylation specific enzymes.Only at the methylated CpG site is the padlock probe ligated successfully to form a circle template for the HRCA reaction.Utilizing the method of 3-dimensional polyacrylamide gel-based microarray,the HRCA product will be immobilized on the slide to form a DNA microarray,which can universally hybridize the Cy3-labeled oligonucleotide probe to detect the methylation status of CpG sites.To control the false positive signals,DNA ligase and temperature of ligation/digestion are optimized.Methylation status of four CpG sites located in P15,Ecadherin,hMLH1 and MGMT genes were analyzed successfully with this method and all the results were compatible with that of methylation-specific PCR.Our research proves that this method is simple and inexpensive,and could be applied as a high-throughput tool to qualitatively determine the methylation status of CpG sites.
文摘近年来,食源性致病菌在全球范围内大面积传播,给人类的生存健康与发展带来了巨大的威胁。因此为了保证食品的安全,快速的、高特异性且高灵敏地检测食品致病菌方法已经成为科学研究的热点话题。在本研究中,我们构建了一种基于滚环扩增技术的纸基显色传感器用于可视化检测致病菌的检测平台。通过滚环扩增对单增李斯特菌的hly A mRNA进行高效特异性扩增,扩增后的单链产物经过Hhal酶进行特异位点酶切后,形成与锁式探针长度相同的片段。将酶切后的单链产物不经过预变性杂交,可直接进行试纸条检测。在优化的实验条件下,可以检测到100 pg/μL总RNA。整个过程实验包括连接,扩增,酶切,检测等反应均可在恒温条件下进行,且可在几个小时内完成。这种方法适用于快速的现场检测,此外,这项研究强调了纸基显色诊断平台的潜在价值和应用前景。
文摘滚环扩增(rolling circle amplification,RCA)是新近发展起来的一种恒温核酸扩增方法。这种方法不仅可以直接扩增DNA和RNA,还可以实现对靶核酸的信号放大,灵敏度达到一个拷贝的核酸分子,因此在核酸检测中具有很大的应用价值和潜力。本文结合了滚环扩增技术在医药领域中的最新研究进展,介绍了滚环扩增的原理及其在医药领域中的应用。
文摘滚环扩增技术(rolling circle amplification,RCA)的建立模拟了自然界中环状病原生物DNA通过滚环模型方式自我复制的原理,经长期科学研究和实践应用,取得了诸多突破性成果。对最近几年在滚环扩增技术研究领域的最新动态进行了较全面的总结,其中包括了网状RCA、锁式探针RCA、目标成环RCA和跨越式RCA,也对滚环扩增中存在的问题进行了探讨,重点介绍了该技术在基础研究、实际检测、医疗诊断及纳米材料等方面的应用,最后对核酸等温扩增技术产业化的发展前景进行了展望。
