Search Thermo Fisher Scientific
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Référence | Nbre de réactions |
---|---|
4458237 | 50 réactions |
4458236 | 400 réactions |
If you are targeting a low-abundance gene, you may have trouble getting Ct values in a good, reliable range (Ct > 32). To increase the sensitivity of the assay, you may want to consider the following:
- Increase the amount of RNA input into your reverse transcription reaction, if possible
- Increase the amount of cDNA in your qPCR reaction (20% by volume max)
- Try a different reverse transcription kit, such as our SuperScript VILO Master Mix, for the highest cDNA yield possible
- Consider trying a one-step or Cells-to-CT type workflow (depending on your sample type)
With very small samples, it is always better to use a lysis-based solution so that you don't lose any of your sample. Cells-to-CT kits, for example, can accommodate as few as 10 cells. If your sample size is smaller than 10 cells, we recommend using the Single Cell-to-CT Kit.
There is no reason why the Cells-to-CT system shouldn’t work with any cell line. However, due to differences in cell size and composition, the maximum number of cells per lysis reaction may be slightly different for different cell lines. We recommend testing for inhibition and optimal cell input by using the TaqMan Cells-to-CT and SYBR Green Cells-to-CT Control kits.
Find additional tips, troubleshooting help, and resources within our Real-Time PCR and Digital PCR Applications Support Center.
We do not recommend normalizing to an endogenous control due to the biological variation and transcriptional noise exhibited by single cells. Because of this variation, normalization can actually increase the spread of calculated expression levels in single cells.
We have tested the reagents that are stored frozen with five to ten freeze–thaw cycles and have seen no effect on Ct values. Up to five freeze–thaw cycles for the lysate samples have been shown to have no significant effect on gene expression data.
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