[ Objective] This study aimed to develop a simple and effective DNA extraction method for citrus Huanglongbing pathogen detection. [ Method] From aspects of preparing procedure, prepare time and the quality of DNA, ad...[ Objective] This study aimed to develop a simple and effective DNA extraction method for citrus Huanglongbing pathogen detection. [ Method] From aspects of preparing procedure, prepare time and the quality of DNA, advantages and disadvantages of three sample preparation methods were compared, include two Direet-PCR extraction methods and one universal genomic DNA extraction kit method. In addition, PCR amplification effect on specific primers for 16S rDNA of ＂Candidatua Libefibacter asiaticus＂ （CLas） had also been evaluated. [ Result] The results showed that RT-qPCR detected CLas by using DNA obtained from one of Direct-PCR extraction method as templates. Under improved Direct-PCR extraction method, 16S rDNA of CLas could also be amplified by routine PCR. [ Conclusion] A simple and effective DNA extraction method of citrus Huanglongbing pathogen have been established, which provides technical supports for prepa- ration of large number of samples for detection of CLas.展开更多
目前法医DNA检验应用的短串联重复序列(short tandem repeat,STR)复合扩增系统均依赖于荧光标记的多重PCR方法。常规DNA检验流程包括提取、定量、扩增、分离和检测,而多重PCR扩增常常是整个过程中的限速步骤,完成28~30个循环大约需要3 ...目前法医DNA检验应用的短串联重复序列(short tandem repeat,STR)复合扩增系统均依赖于荧光标记的多重PCR方法。常规DNA检验流程包括提取、定量、扩增、分离和检测,而多重PCR扩增常常是整个过程中的限速步骤,完成28~30个循环大约需要3 h。以往常利用商业化的热循环仪和热稳定DNA聚合酶,但需要很长的PCR循环时间才能够确保100~400 bp的目标片段得到有效且均衡的复合扩增。随着各种缩短扩增时间方法的出现,STR复合扩增不再需要3 h,而是可以减少到几十分钟甚至十几分钟。现主要总结了快速PCR、直接PCR、芯片PCR以及其他快速扩增等方法的研究现状与进展,尤其是在法医DNA检验领域,同时对比了几种常见快速PCR扩增方法,可见缩短扩增时间对DNA检验的意义重大。未来,以芯片为主导、快速检验为目的的全自动、便携式、集成化的DNA分析系统,将使得法医DNA检验从实验室走进案件现场,甚至日常生活,实现真正的快速即时检验。展开更多
基金Supported by Most-USDA Cooperation Program in Agriculture Science and Technology(10-8100-1452-CA)National Natural Science Foundation of China(31071712)
文摘[ Objective] This study aimed to develop a simple and effective DNA extraction method for citrus Huanglongbing pathogen detection. [ Method] From aspects of preparing procedure, prepare time and the quality of DNA, advantages and disadvantages of three sample preparation methods were compared, include two Direet-PCR extraction methods and one universal genomic DNA extraction kit method. In addition, PCR amplification effect on specific primers for 16S rDNA of ＂Candidatua Libefibacter asiaticus＂ （CLas） had also been evaluated. [ Result] The results showed that RT-qPCR detected CLas by using DNA obtained from one of Direct-PCR extraction method as templates. Under improved Direct-PCR extraction method, 16S rDNA of CLas could also be amplified by routine PCR. [ Conclusion] A simple and effective DNA extraction method of citrus Huanglongbing pathogen have been established, which provides technical supports for prepa- ration of large number of samples for detection of CLas.
