| 摘要 |
Conventional gene expression systems and purification methods target mRNA present throughout the entire cell and, thus, their results show the sum of newly transcribed mRNA as well as digested mRNA. Thus, it was previously difficult to detect expression of new mRNA under conditions that digestion of mRNA is in progress. Further, when a large amount of mRNA is already present, it is difficult to detect a slight change in the quantity of mRNA, and thus sensitivity is low. A new method is developed by focusing on the fact that newly synthesized mRNA is confined inside the nucleus. Cells are captured on a membrane and then treated by a cell membrane permeation solution such as NP-40, thereby increasing permeability to cell membranes. After the cytoplasm is washed, nuclei are dissolved with a cell dissolving solution, and then mRNA can be successfully recovered from the thus-obtained solution. This method is very simple, and only 2-3 minutes extra time is required, but a large number of specimens can be treated and the method can be incorporated into an automated system. Thus, this method is likely to be considered to be a standard method of treating a sample for a gene expression analysis, particularly for RT-PCR.
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