PCR protocol for microsatellite markers
(can also be used for standard PCR)
  1. Dilute original genomic DNA prep as 1:50 in ddH2O.
    2 µl DNA prep
    98 µl ddH2O

  2. 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
    ddH2O12.7 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

  3. run PCR program conditions:
    step 1: initial denaturation:94 oC5 minutes
    step 2: denaturation:94 oC30 seconds
    step 3: annealing***:55 oC30 seconds
    step 4: extension:72 oC1 minute
    step 5: go to step 2for another 34 cycles
    step 6: extension:72 oC3 minutes
    step 7: incubate at10 oCfor ever

  4. 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)

  5. clean up good PCR products using Qiagen PCR purification Kit****.
    1. add 5 volume of PB buffer (~85µl) to each sample, and mix well.
    2. transfer all solution to Qiaquick spin column.
    3. spin column in microcentrifuge at max speed for 1 minute.
    4. decant liquid in the collection tube.
    5. add 750 µl of PE buffer to each sample.
    6. spin column in microcentrifuge at max speed for 1 minute.
    7. decant the collection tube.
    8. spin column in microcentrifuge at max speed for 1 minute again to remove residual liquid.
    9. transfer column to a new 1.5 ml microcentrifuge tube (eppie) with proper labeling.
    10. add 150 µl of ddH2O to each column, and wait for 1 minute to elute PCR products.
    11. spin column in microcentrifuge at max speed for 1 minute.
    12. store eluant (in the microcentrifuge tube) at -20 oC until needed for running on automatic sequencer.

  6. clean Qiaquick spin columns and collection tubes as following:
    1. rinse collection tube twice with ddH2O using a squirt bottle.
    2. rinse Qiaquick spin column three times with ddH2O using a sqirt bottle.
    3. assemble Qiaquick spin column in collection tube, then fill it up with ddH2O.
    4. spin column in microcentrifuge at max speed for 1 minute.
    5. decant the collection tube, then place Qiaquick column back in.
    6. spin column again in microcentrifuge at max speed for 1 minute.
    7. 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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