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PCR protocol for microsatellite markers
(can also be used for standard PCR)
- Dilute original genomic DNA prep as 1:50 in ddH2O.
2 µl DNA prep
98 µl ddH2O
- use filter tips to assemble PCR reactions
For single reaction:
| 10x PCR buffer (no MgCl2) | 2.0 µl |
| 50mM MgCl2* | 0.6 µl |
| dNTPs (10mM each) | 0.4 µl |
| Taq polymerase (1:10 diluted) | 0.3 µl |
| ddH2O | 12.7 µl |
| forward primer (5 pmole/µl)** | 1.0 µl |
| reverse primer (5 pmole/µl) | 1.0 µl |
| templates (1:50 diluted) | 2.0 µl |
|   |   |
| Total volume: | 20.0µl |
- run PCR program conditions:
| step 1: initial denaturation: | 94 oC | 5 minutes |
| step 2: denaturation: | 94 oC | 30 seconds |
| step 3: annealing***: | 55 oC | 30 seconds |
| step 4: extension: | 72 oC | 1 minute |
| step 5: go to step 2 | | for another 34 cycles |
| step 6: extension: | 72 oC | 3 minutes |
| step 7: incubate at | 10 oC | for ever |
- check 3 µl of PCR product on 1% 0.5X TBE gel.
For 40 ml gel:
40 ml 0.5X TBE
0.4 g agarose
8 µl of a 1:1000 dilution of Sybr Safe dye
(Ethidium Bromide is not allowed in the MEAD lab)
- clean up good PCR products using Qiagen PCR purification Kit****.
- add 5 volume of PB buffer (~85µl) to each sample, and mix well.
- transfer all solution to Qiaquick spin column.
- spin column in microcentrifuge at max speed for 1 minute.
- decant liquid in the collection tube.
- add 750 µl of PE buffer to each sample.
- spin column in microcentrifuge at max speed for 1 minute.
- decant the collection tube.
- spin column in microcentrifuge at max speed for 1 minute again to remove residual liquid.
- transfer column to a new 1.5 ml microcentrifuge tube (eppie) with proper labeling.
- add 150 µl of ddH2O to each column, and wait for 1 minute to elute PCR products.
- spin column in microcentrifuge at max speed for 1 minute.
- store eluant (in the microcentrifuge tube) at -20 oC until needed for running on automatic sequencer.
- clean Qiaquick spin columns and collection tubes as following:
- rinse collection tube twice with ddH2O using a squirt bottle.
- rinse Qiaquick spin column three times with ddH2O using a sqirt bottle.
- assemble Qiaquick spin column in collection tube, then fill it up with ddH2O.
- spin column in microcentrifuge at max speed for 1 minute.
- decant the collection tube, then place Qiaquick column back in.
- spin column again in microcentrifuge at max speed for 1 minute.
- disassemble Qiaquick column and collection tube, and leave them air-dry in the wired basket in dish strainer.
Notes:
LocusLabeling on forward primerexpected proximate PCR product size (bp)annealing temperature
(oC)MgCl2 concentration (mM)DM406-FAM240621DM58HEX280551.5DM946-FAM170581.5 reference:
http://www.mbg.cornell.edu/CM_Images/Uploads/MBG/aquadro_lab_unlocal.html
*: MgCl2 concentration may vary depending on each locus.
**: Each forward primer solution is a mixture of 80% non-labeled primer and 20% fluorescent labeled primer.
***: Annealing temperature may vary depending on the primer pair of each locus.
****: (cat. # 28106) Reuse the Qiaquick spin columns and collection tubes.
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