遗传 ›› 2004, Vol. 26 ›› Issue (6): 836-840.

• 论文 • 上一篇    下一篇

正交法整体优化差异显示反应体系

柳淑芳1;2;杜立新3;①;朱靖1;王爱华3   

  1. 1.山东农业大学动物科技学院,泰安 271018;2.国家水产品质量监督检验中心,青岛 266071;3.中国农业科学院畜牧研究所,北京 100094
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2004-12-10 发布日期:2004-12-10

Optimizing the Reaction System of DDRT-PCR by Positive-cross Test

LIU Shu-Fang1,2;DU Li-Xin3,①;ZHU Jing1;WANG Ai-Hua3   

  1. 1.College of Animal Science and Technology, Shandong Agricultural University, Taian 271018,China;2.The national center for quality supervision and test of aquatic product, Qingdao 266071, China;3.Institute of Animal Husbandry, Chinese Academy of Agricultural Science, Beijing 100094 ,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2004-12-10 Published:2004-12-10

摘要: mRNA 差异显示PCR( mRNA differential display PCR,DDRT-PCR)是分离差异表达基因的有效方法,但该方法的准确性极易受到外部因素和内部因素的影响。本研究采用正交法优化DDRT-PCR反应条件,充分考虑到模板浓度、锚定引物浓度、随机引物浓度、dNTPs浓度、镁离子浓度以及Taq酶用量等因素在差异显示反应过程中的交互作用,一次PCR反应即可确定最佳反应组合。将筛选出的条件用于DDRT-PCR,得到差显结果假阳性率低,重复性和稳定性好,而且简化了反应条件的优选程序,这表明正交法是优化差异显示反应条件的理想方法。为了进一步简化整个差异显示反应系统的操作程序,降低假阳性率,研究采用了非变性聚丙烯酰胺凝胶电泳(polyacrylamide gel electrophoresis,PAGE)和银染显示差异带的方法,并用反向Northern法来验证回收条带,从而更加优化了差异显示反应体系。

关键词: 银染, 反向Northern, 非变性PAGE, DDRT-PCR, 正交优化

Abstract: The method of mRNA Differential display PCR (DDRT-PCR) is used to identify differentially expressed genes widely. To improve further the efficiency and reproducibility of the method, the positive-cross test were performed to find the optional conditions of DDRT-PCR by analyzing the six critical parameters of dNTPs, MgCl2, arbitrary primer, anchor primer, Taq enzyme, and template systematically. The experimental findings delineated the best possible DDRT-PCR conditions for a more reliable assessment of differential gene expression. Additionally, in this study, nondenaturing polyacrylamide gel electrophoresis (PAGE) and silver straining were adopted to reduce the false-positive ratio, and the reclaimed fragments were detected by reverse Northern analysis. Finally, we obtained the optimal condition for DDRT-PCR.