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Inspired by the post about extracting pet DNA, how long would genomic DNA be stable for in a -20°C freezer? It is common practice to store DNA (double-stranded, plasmid) in a -20°C freezer in the lab, but would genomic DNA last longer in a -80°C freezer? With either method, how long would it be stable for?

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It depends on your concentration. More concentrated DNA is more stable. –  jp89 May 11 '12 at 14:42
    
Closely related to this question - if not dupe? –  Rory M May 11 '12 at 19:31
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up vote 4 down vote accepted

If the DNA is pure, it should last quite a long time. If there are enzymes and other biological molecules in there, -80C will work much better.

I think you could keep pure DNA at -20C practically indefinitely.

Purity is the main issue there, also pH stabilized, sealed properly, etc. That makes all the difference.

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I would say that even at 4°C the stability is fairly high –  nico May 12 '12 at 12:23
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You can store your DNA for 1 week at -4C and for one month at -20C but with storing DNA over these period of time there is a deduction of 10-15% of yield from your DNA sample.

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Can you provide a citation for this? I am skeptical, because I routinely transfect cells using DNA stocks frozen years ago. –  leonardo Sep 5 '13 at 15:02
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