We need a bit more information. I assume you treated the sample with DNAse before procedeeing to make cDNA and the subsequent PCR with SYBRgreen. Is this correct or did you do something else?
All right. This neans that you don't have a PCR product. My suggestion would be to repeat the experiment as follow. Do the same experiment with three different conditions. First add a negative control, meaning use water instead of the RNA. Second with the same RNA and third if you have another kind of RNA use that as a positive control.
I would like to see what kind of results would you get under these conditions.
first and foremost I would load the content of your Q-PCR wells in an agarose gel (if you didn't already). This would allow you to directly check what happened during the amplification...a sharp band at the expected size? a horrible smear (which btw would fit with the results of the melting curve)? something in between?
If DNAse is not inactivated or removed from RNA, the presence of DNAse may affect the amplification (as you are now doing one-step RT-qPCR, not 2-step).
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