Nick Translation of DNA for CGH
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1. Prepare reaction mixtures per 50ul Add Enzymes last, gently vortex mixture, quick spin liquid to bottom of tube:
Label |
Biotin-dUTP |
Digox-dUTP |
FITC-dUTP |
Texas Red dUTP |
10X Biotin dNTP |
5 ul |
0 ul |
0 ul |
0 ul |
10X A4 dNTP |
0 ul |
5 ul |
5 ul |
5 ul |
dUTP |
0 ul |
1 ul |
1 ul |
1 ul |
DNA POL-1 |
1 ul |
1 ul |
1 ul |
1 ul |
DNA Pol/DNAse (additional) |
(2.5-5 ul) |
(2.5-5 ul) |
(2.5-5 ul) |
(2.5-5 ul) |
DNA (1ug) | ||||
ddH2O | ||||
Total Reaction Volume |
50 ul |
50 ul |
50 ul |
50 ul |
2. Incubate reaction mixtures for 60 minuteundefined at 15 C (prepare in advance using ice bucket, water and ice).
3. Stop reaction by heating at 70 C for 15 minutes.
4. Run 3-5 uundefined of probe on 1% agarose gel to check size. Product should run as a smear ranging from 0.3-2.3 kb.
5. Store probes at -20 C.
The volume of enzyme, time of incubation, and amount to run on agarose gel will vary depending on sample and enzyme:
The 10X enzyme is the "fast enzyme" and we order the same lot of this for several months. The slow enzyme is a separate enzyme, which requires testing on fresh PCR amplified DNA with FITC and or Texas Red to determine what mixture of fast and slow to use for subsequent nick translations.
DNA Polymerase/DNase I :
DNA Pol-1/DNase I : this is the " slow enzyme" mix in the Nick Tranlsation Kit from GIBCO. You can also order the enzyme separately from Gibco (catalog #18162-016). This enzyme is less active than the 10X Enzyme mix from the BioNick kit. If you need to use this then try 60 minutes using 5 ul first, and adjust conditions as needed. This enzyme is better for smaller DNA and/or degraded DNA .
FRESH DNA : This should be of high molecular weight. If the DNA has some degraded lower molecular weight DNA present then the enzyme used for the Nick Translation should probably be the "slow" enzyme as discussed above.
PARAFFIN DN A: Formalin fixed dna appears to be resistant to cutting and incorporation. It is best to use the full 5 ul of 10X fast enzyme for 90 minutes, unless the DNA is getting cut up easily. If the volume of the DNA in TE is greater then 10 ul, add more enzyme to compensate for the extra EDTA from the TE in the reaction.