I am using shRNA. The construct is transfected into cells and I think that the shRNA keeps expressing from the DNA vector. I am new to this. How long following transfection should I wait to look for knockdown?
The answer can depend a lot on the protein due to variance in the amount of mRNA of a protein in the cell. You can imagine if one protein had 1000 copies of mRNA per cell while another had 1,000,000 the one with 1000 would be easier to knockdown. You also have to consider the half-life turnover of the protein. That being said for most proteins I usually detect a noticeable decrease by 24h that peaks between 48-72h.