TASKWhoDunnitObserved
Split cellsAG, CR, LA, SSAW
Seed platesAG, CR, LA, SSAW
TransfectionAG, LAAC, SS
FACS PrepAG, LACR
Imaging (FloCyto)BTAG, AW, CR, JX, LA

 

Practice Transfections:

CONTROLS:

  1. -ve/-ve: no actions performed on cells
  2. -ve: perform protocol, excluding DNA, or with dummy DNA
  3. +ve: tri-color control (perform experiments with YFP, BFP, mKATE separately, and one with all 3: allows for comparison of color/intensity when imaging)

 


PRACTICE #1: Fluorescent protein under constitutive promoter

  • 6/23: Seed cells
  • 6/24: Transfect hEF1a:eYFP (472 ng/uL) into HEK cells
  • 6/26 (4.30pm): Flow Cytometer
    • Determine optimal Lipofectamine LTX volume (24 well)
    • Determine transfection efficiency (quantitatively)

RESULT: Decent transfection efficiency (~60%). Move on to Practice #2.

PRACTICE #2: Co-transfection (2 fluorescent proteins under constitutive promoter)

ATTEMPT #1

  • 7/3: Seed cells
  • 7/4: Transfect hEF1a:eYFP (472 ng/uL) and hEF1a:tagBFP (1176 ng/uL) into HEK cells
  • 7/6 (1pm): Flow Cytometer

 

Y1
  • hEF1a:eYFP
(Y+B)1
  • hEF1a:eYFP
  • hEF1a:tagBFP
 ////// ////// ////// -ve control
  • dummy DNA
  • with Lipofectamine
Y2
  • hEF1a:eYFP
(Y+B)2
  • hEF1a:eYFP
  • hEF1a:tagBFP
 ////// ////// ////// -ve control
  • dummy DNA
  • with Lipofectamine
B1
  • hEF1a:tagBFP
(Y+B)3
  • hEF1a:eYFP
  • hEF1a:tagBFP
 ////// ////// ////// -ve/-ve control
  • no DNA
  • no Lipofectamine
B2
  • hEF1a:tagBFP
(Y+B)4
  • hEF1a:eYFP
  • hEF1a:tagBFP
 ////// ////// ////// -ve/-ve control
  • no DNA
  • no Lipofectamine


RESULT: Extremely low transfection efficiency (<10%). Repeat to improve co-transfection results.

 

ATTEMPT #2

  • 7/_: Seed cells
  • 7/_: Transfect hEF1a:eYFP and hEF1a:tagBFP into HEK cells
  • 7/_ (_pm): Flow Cytometer

 

Y1
  • hEF1a:eYFP
(Y+B)1
  • hEF1a:eYFP
  • hEF1a:tagBFP
//////////////////-ve control
  • dummy DNA
  • with Lipofectamine
Y2
  • hEF1a:eYFP
(Y+B)2
  • hEF1a:eYFP
  • hEF1a:tagBFP
//////////////////-ve control
  • dummy DNA
  • with Lipofectamine
B1
  • hEF1a:tagBFP
(Y+B)3
  • hEF1a:eYFP
  • hEF1a:tagBFP
//////////////////-ve/-ve control
  • no DNA
  • no Lipofectamine
B2
  • hEF1a:tagBFP
(Y+B)4
  • hEF1a:eYFP
  • hEF1a:tagBFP
//////////////////-ve/-ve control
  • no DNA
  • no Lipofectamine

 

 

PRACTICE #3: Fluorescent protein under inducible promoter

  • 7/_: Seed cells
  • 7/_: Transfect TRE:mKate, hEF1a:rtTA and hEF1a:eYFP (transfection marker) into HEK cells
  • 7/_: Add DOX
  • 7/_ (__pm): Flow Cytometer

 

+ve control
  • hEF1a:eYFP
+ve control
  • hEF1a:eYFP
-ve control
  • dummy DNA
  • with Lipofectamine
-ve control
  • dummy DNA
  • with Lipofectamine
-ve/-ve control
  • no DNA
  • no Lipofectamine
-ve/-ve control
  • no DNA
  • no Lipofectamine
////////////////////////////////////
(D=0)1
  • no DOX
  • hEF1a:eYFP
  • hEF1a:rtTA
  • TRE:mKate
D=0.2
  • 0.2uM DOX
  • hEF1a:eYFP
  • hEF1a:rtTA
  • TRE:mKate
D=1
  • 1uM DOX
  • hEF1a:eYFP
  • hEF1a:rtTA
  • TRE:mKate
D=1.5
  • 1.5uM DOX
  • hEF1a:eYFP
  • hEF1a:rtTA
  • TRE:mKate
D=3
  • 3uM DOX
  • hEF1a:eYFP
  • hEF1a:rtTA
  • TRE:mKate
D=4
  • 4uM DOX
  • hEF1a:eYFP
  • hEF1a:rtTA
  • TRE:mKate
(D=0)2
  • no DOX
  • hEF1a:eYFP
  • hEF1a:rtTA
  • TRE:mKate
D=6
  • 6uM DOX
  • hEF1a:eYFP
  • hEF1a:rtTA
  • TRE:mKate
D=7.5
  • 7.5uM DOX
  • hEF1a:eYFP
  • hEF1a:rtTA
  • TRE:mKate
D=10
  • 10uM DOX
  • hEF1a:eYFP
  • hEF1a:rtTA
  • TRE:mKate
D=17
  • 17uM DOX
  • hEF1a:eYFP
  • hEF1a:rtTA
  • TRE:mKate
D=30
  • 30uM DOX
  • hEF1a:eYFP
  • hEF1a:rtTA
  • TRE:mKate

PRACTICE #4**: Co-transfection (2 fluorescent proteins under constitutive & inducible promoters)

  • 7/_: Seed cells
  • 7/_: Transfect hEF1a:eYFP, TRE:mKate and hEF1a:rtTA** into HEK cells
  • 7/_: Add DOX
  • 7/_ (__pm): Flow Cytometer