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Hello everyone, I need help with my PCR. I am new to the PCR and my aim is to detect the expression of specific genes by RT-PCR. I have enough total RNA (detected by gel electrophoresis, nanodrop) but after trancription I cant detect any cDNA. I dont know where I go wrong since I add all the reagents (random primers-70 C for 10 mins followed by 5 X buffer, 0.1M DTT, dNTPs and superscript II- 42 C for 50 mins).I would be happy if someone could help or give suggestions. I did RT-PCR and detected no amplification whatsoever. I also ran a gel and detected no visible bands. So I assume no cDNA
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It may be that the salt concentration in your initial RNA sample is too high and inhibitory to the RT enzyme. I would purify the RNA with a column and then proceed to RT. -
Assuming you did a good quality RNA isolation. Did you do a 25degree incubation before the 42degree for 50 minutes? Otherwise the random hexamer will not bind efficiently and you will have limited synthesis.Comment
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I’m not a sequencing expert. I’m a purification scientist who uses NGS to evaluate workflows my group develops. With this perspective, we think about the sample first and the NGS workflow second. The sequencer is an exceptionally honest reporter, but it can only report on what you give it, so whether you get clean, interpretable data from an NGS workflow is largely determined before you begin.
Here are nine questions we think about, in roughly the order they matter, before...06-18-2026, 07:11 AM -
Data variability is still an issue in sequencing technologies despite the advances in reproducibility and accuracy of these platforms. But the problem does not originate in the sequencing itself, but in the previous steps, before the sample reaches the sequencer.
The first step is collection, followed by preservation and sample preparation for analysis. Most scientists overlook those steps, but not being careful might just be skewing the experiment’s results.
...06-02-2026, 10:05 AM
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