Thursday, October 2, 2014


Objerctive: Convert RNA to cDNA using


Reverse Transcription (Promega M-MLV: Cat#M1701; ) [Cost per sample ~$1.50]

A single reaction volume = 25uL. The volume of RNA, primer(s) and M-MLV RT used are variable and will be specific to your current experiment. The directions below apply to a reaction using 1ug of total RNA. You may need to make changes to accommodate your own conditions.

  1. Use as much RNA as possible (up to 1ug); max volume of RNA = 17.75uL. Generally, identify the RNA sample with the lowest concentration and multiply by 17.75uL. Use this quantity (ug) of RNA for each and every sample.
  2. Transfer calculated volume(s) of RNA to 0.5mL snap cap tubes or PCR plate. Adjust volumes of individual samples to 17.75uL with H2O.
  3. Add appropriate amount of primer to sample. Use 0.25ug primer per 1ug of RNA in sample (= 0.5uL of Promega oligo dT Cat#C1101 in this example). Total volume (RNA + primers) should equal 18.25uL.
  4. Heat samples at 70C for 5 min in thermocycler.
  5. Place samples on ice IMMEDIATELY.
  6. Make Master Mix:

5 uL 5x Buffer (M-MLV RT Buffer)
1.25 uL 10mM dNTPs (Promega Cat#U1511)
0.5 uL M-MLV RT per ug of RNA

7. Mix well.
8. Add 6.75uL of master mix to each reaction.
9. Mix well, but do not vortex.
10.Spot spin.
11.Incubate @ 42C for 1hr in thermalcycler for oligo dT primers OR @ 37C for random primers.
12.Heat inactivate @ 95C for 3 min.
13.Spot spin.
14.Store @ -20C.

3/17/2011 SJW

Starting RNA 1ug calculations
1-1 .99ul
1-2 2.31ul
2-1 1.13 ul
2-2 1.50 ul

Results:  Procedure was going well until we reached the Master Mix solution. noticed that their was to much master mix left over so it is likely somewhere in the creation of the MM or pipetting the MM into the solution that an error was made. We still ran the entire protocol to see if anything was successful. Planning on running the PCR next week to verify that the primers that were ordered are valid.

Checked on the Sea pens today the changes to the peristaltic pump appeared to be successful everything was running correctly and the levels in the feeding bucket were the same as when I left yesterday. I am still considering removing the reverse flow on the pump into the bucket so the quantities of artemia being delivered are more consistent but will watch the sea pens to see if this makes a difference. I noticed that in each of the buckets with two sea pens that 1 sea pen is very inflated and looks healthy and the other does not so it is possible that they do not do well when in close quarters with each other possible because they are attacking each other when touching. I would like to take some tissue samples to verify that they in fact do have nematocysts though the I will have to look into if it would be visible just by looking through the microscope may need to find a way to fire them off which we had done in lab I will talk with Claire to see.

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