PCR Typing Ear Punches
Heat ear punch in 300 µl 10 mM NaOH/0.1 mM EDTA at 95C for 10 min. Store at RT.(
Heat ear punch in 300 µl 10 mM NaOH/0.1 mM EDTA at 95°C for 10 min. Store at RT.
(300 µl aliquots of 10 mM NaOH/0.1 mM EDTA can be frozen. However, do not store 10 mM NaOH/0.1 mM EDTA at room temperature in glass, as it will react with the glass.)
Use 4 µl of each DNA sample with 9 µl of water in each PCR reaction. Denature at 95°C for 10 minutes in the PCR machine. At 85°C add 7 µl of the cocktail (freshly made and premixed; can be added through the oil.)
Cocktail per reaction
| 100 ng/µl primer 1 | 1.2 µl | |
| 100 ng/µl primer 2 | 1.2 µl | |
| 10X PCR buffer | 2.0 µl | |
| 20 mM MgCl2 | 2.0 µl | |
| 10 mM dNTPs | 0.4 µl | |
| 5 U/µl Taq | 0.2 µl |
Cycle conditions
| 94°C | 0.5 min | |
| 62°C | 0.5 min | |
| 72°C | 1.5 min | |
| 39 cycles |
Run the whole sample on an agarose gel with markers, a no DNA negative control, and positive controls. The primers are in massive excess and will make a low molecular weight smear on the gel.
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