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silly control question


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#1 jacobripley

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Posted 13 March 2010 - 02:45 AM

Hello,

I am quite new to PCR but there is something I donít understand

Why is it that when I use a No RT ( a sample that hasnít gone through reverse transcription) as a control I see no amplification - I am aware this is a good thing. But basically why doesnít the mRNA act as a template and produce no product? after all I have primers and polymerase in there that would recognise it? Is it to do with the U bases preventing primer annealing? But this cannot just be the only thing preventing this amplification. Once the mRNA is turned to cDNA everything appears to be fine.

Thanks
J

#2 leelee

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Posted 14 March 2010 - 01:35 AM

Your polymerase is a DNA polymerase, and can therefore only catalyse the polymerisation of DNA and not RNA.

#3 Trof

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Posted 17 March 2010 - 03:55 AM

Your polymerase is a DNA polymerase, and can therefore only catalyse the polymerisation of DNA and not RNA.

To be precise, it can only catalyse polymerisation of DNA with DNA as a template. It doesn't recognise RNA.

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