Team:Freiburg/Notebook/lab hormon

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Protocols

If there´s no other remark all the experiments were performed by the following protocols.

Transformation (Trafo)

1. 1 µl of plasmid (~ 20 ng/µl) was added to 25 µl of chemically competent E. coli cells
2. incubation for 10 min on ice
3. heatshock (42 °C for 45 s)
4. incubation for 2 min on ice
5. addition of 500 µl LB medium
6. incubation for 15 min at 37 °C (shaking)
7. incubation over night at 37 °C on LB plates with ampicilline

Miniprep

using Roti-Prep Plasmid Mini from Roth

1. resuspension of the bacteria in 250 µl resuspension buffer
2. addition of 250 µl lysis buffer
3. incubation for 5 min at RT
4. addition of 350 µl neutralization buffer
5. centrifugation for 10 min at full speed and RT
6. loading of supernatant on columns
7. centrifugation for 30 s at 10.000 g and RT
8. addition of 750 µl washing buffer
9. centrifugation for 30 s at 10.000 g and RT
10. repeat of the last two steps
11. centrifugation for 1 min at 10.000 g and RT
12. addition of 30 µl distilled water
13. incubation for 5 min at RT
14. centrifugation for 1 min at 10.000 g and RT

Digestion

Stuff	Volume
plasmid	7 µl
restriction enzyme	each 2 µl
BSA (10x)	5 µl
NEB buffer	5 µl
water	up to 50 µl

Incubation at 37 °C for 3 h.

Gel extraction

using QIAquick Gel extraction kit from Qiagen

1. addition of 500 µl QG-Buffer to the cut gel piece
2. incubation for 10 min at 50°C with vortexing all 2 to 3 min
3. loading the eluted gel onto a column and centrifugation for 1 min at full speed
4. addition of another 500 µl QG-Buffer
5. centrifugation for 1 min at full speed
6. addition of 750 µl PE-Buffer
7. incubation for 4 min at RT
8. centrifugation two times for 1 min at full speed
9. addition of 25 µl distilled water
10. incubation for 13 min at RT
11. centrifugation for 1 min at full speed

PCR

Planned constructs

Practical work: Localization

17.04.2013

Trafo of pMZ333

pMZ333 containing mCherry and the backbone (Bb)

18.04.2013

Picking of clones

3 colonies of pMItom (containing ERT2) and 1 of pMZ333.

19.04.2013

Minipreps of pMZ333 and pMItom

Yield: 100 - 300 ng/µl

23.04.2013

Digestion of pMZ333

Bb was cut out of pMZ333 by XbaI and EcoRI.

Gel run

0,7 % agarose, marker: GeneRuler 1 kb

Gel extraction

Bb was purified.
Yield: 20 - 30 ng/µl

25.04.2013

PCR of aIG3001 and aIG3006-8

Gel run

0,9 % agarose, marker: GeneRuler 1 kb

Gel extraction

PCR products were purified.
Yield: 30 - 90 ng/µl

03.05.2013

PCR of aIG3002-5

Gel run

0,9 % agarose, marker: GeneRuler 1 kb

Gel extraction

PCR products were purified with the following changes to the standard protocol:

• After the first incubation, the samples were vortexed followed by another incubation for 2 min at 50°C.
• Between the centrifugations after PE buffer incubation the epis were turned around for 180°.
• After 13 min incubation with water, samples were incubated for 4 min at 55°C.

Yield: 100 - 140 ng/µl

06.05.2013

Gibson assembly

Pipetting scheme:

For pIG3005 and pIG3007 I used only the half amount of DNA as otherwise the total volume would have been higher than 5 µl.

Gibson assembly was performed by the following protocol:

1. 5 µl of DNA mixes were added to 15 µl of Gibson master mix, each.
2. Incubation for 1 h at 50°C
3. Incubation for 3 min at RT
4. Incubation for 10 min on ice

Trafo

1. 4 µl of each assemblies were added to 25 µl of chemically competent E. coli cells
2. incubation for 13 min on ice
3. heatshock (42 °C for 45 s)
4. incubation for 2 min on ice
5. addition of 500 µl LB medium
6. incubation for 15 min at 37 °C (shaking)
7. 20 µl, 200 µl and 300 µl (concentrated) were distributed on agar plates with ampicilline
8. incubation over night at 37 °C

07.05.2013

Trafo repeat

As there were very few colonies only on the 300 µl plates which were surrounded by "satellite colonies", transformation was repeated by using the same protocol exept of:

• The first incubation at 37°C was 1:15 h.
• Only 300 µl (not concentrated) were distributed.
• Over night incubation lasted only 16 h.

08.05.2013

Picking of clones

Colonies from plates pIG3001-8 (exept of pIG3006, because there were no colonies) of trafo repeat were spread on new agar plates.
Colonies of the first gibson trafo hopefully containing pIG3003,5,6 were spread on new plates to get single colonies.

09.05.2013

Picking of clones

Single colonies of the first gibson trafo were spread on new agar plates.

Minipreps of the second gibson trafo

Yield: 40 - 350 µg/ml

Test digest of gibson constructs

10.05.2013

Gel run of test digest

1 % agarose, marker: GeneRuler 1 kb

The banding pattern of pIG3001 (all colonies); 2,1; 2,2; 4,1; 4,2; 4,4 and 8 (all colonies) has been proven to be the expected one by sequencing the linkers. Thus, the marker run has to be wrong.

Minipreps of the first gibson trafo

Changes:

• Between the second washing step (centrifugation for 30 s) and the drying step (centrifugation for 1 min) the collection tube was changed.
• The incubation with water took only 3 min.

Yield: 40 - 180 ng/µl

Test digest of gibson constructs

Gel run of second test digest

1 % agarose, marker: GeneRuler 1 kb

14.05.2013

Fusion PCR of aIG3009 & 10

aIG3005 & 6 were fused to aIG3009, aIG3007 & 8 to aIG3010 in order to reduce the fragments for Gibson assembly.

Gel run of fusion PCR

Fragment´s lengths were as expected, though the band of aIG3009 was very slight.

15.05.2013

Gel extraction of fusion PCR

PCR products were purified as described on 03.05.2013, but DNA solution was loaded on the column again.
Yield: 6 / 49 ng/µl

16.05.2013

PCR of aIG3006 (repeat)

This PCR was repeated as the concentration yielded from the first attempt is too low for Gibson assembly.

21.05.2013

Repeat of fusion PCR of aIG3009

Fusion PCR was repeated, as the concentration of the first attempt is too low for Gibson assembly.

Gel run of PCR of aIG3006 and fusion PCR of aIG3009

Gel did not show the desired bands.

Gibson assembly 2

Pipetting scheme: Gibson assembly was performed by the following protocol:

1. 5 µl of DNA mixes were added to 15 µl of Gibson master mix, each.
2. Incubation for 1 h at 50°C
3. Incubation for 3 min at RT
4. Incubation for 10 min on ice

Trafo

1. 4 µl of each assemblies were added to 25 µl of chemically competent E. coli cells
2. incubation for 13 min on ice
3. heatshock (42 °C for 45 s)
4. incubation for 2 min on ice
5. addition of 500 µl LB medium
6. incubation for 15 min at 37 °C (shaking)
7. 20 µl, 200 µl and 300 µl (concentrated) were distributed on agar plates with ampicilline
8. incubation over night at 37 °C

22.05.2013

Midiprep of pIG3003, 4 & 8

As the sequencing results were positive, plasmids were amplified and midiprepped according to the manual of Jetstar Plasmid Purification MIDI Kit

Yield: ~ 1 µg/µl for pIG3004 & 8; no DNA was isolated for pIG3003.

23.05.2013

Miniprep of Gibson assembly 2

DNA was purified using High Pure Plasmid Isolation Kit of Roche.

Yield: 30 - 90 ng/µl

Test digest of Gibson assembly 2

Mix 1 was used for DNA concentrations beneath 60 ng/µl, Mix 2 for concentrations above 60 ng/µl.

24.05.2013

Gel run

27.05.2013

Amplification of aIG3006 & 9 by PCR

Yield after Gel extraction with High Pure Plasmid Isolation Kit of Roche: 40 ng/µl for aIG3006 and 82 ng/µl for aIG3009.

28.05.2013

Gibson assembly 3

Pipetting scheme: Gibson assembly was performed by the following protocol:

1. 5 µl of DNA mixes were added to 15 µl of Gibson master mix, each.
2. Incubation for 1 h at 50°C
3. Incubation for 3 min at RT
4. Incubation for 10 min on ice

Trafo

1. 4 µl of each assemblies were added to 25 µl of chemically competent E. coli cells
2. incubation for 13 min on ice
3. heatshock (42 °C for 45 s)
4. incubation for 2 min on ice
5. addition of 500 µl LB medium
6. incubation for 15 min at 37 °C (shaking)
7. 20 µl, 200 µl and 300 µl (concentrated) were distributed on agar plates with ampicilline
8. incubation over night at 37 °C

Transfection of pIG3004 and pIG3008

• 0.75 ng of DNA per well were filled up to 50 µl with OptiMEM
• 2.5 µl of PEI per well were filled up to 50 µl with OptiMEM

These two solutions were mixed by immediately 2x vortexing for ~ 5 s. After 20 min incubation 100 µl were added dropwise to each well.

Medium change was performed after 2 h.

28.05.2013

Cell fixation

Cells on each well were washed with 500 µl PBS and fixed with 200 µl PFA (4 %) solution by incubating for 10 min on ice and at least 20 min at RT.
Cells attached on cover slides were stained with DAPI and DRAQ5 (incubation in DAPI or DRAQ5 solution consisting of 1 µl DAPI or DRAQ5 in 5 ml dH2O for 5 s, respectively) and rinsed in dH2O. Cover slides were dried and mounted on a drop of Mowiol solution (with DABCO) with cells down. After a drying step at 37 °C for 15 min samples were sealed with nail polish and stored at 4 °C.

Flourescence microscopy

These pictures show that pIG3004 is clearly localized in the nucleus whereas pIG3008 is localized in the cytoplasm. Nevertheless more cells have to be analyzed.

30.05.2013

Midiprep of pIG3001, 3 & 6

As the sequencing results were positive, plasmids were amplified and midiprepped according to the manual of Jetstar Plasmid Purification MIDI Kit

Yield: 1.4 µg/µl for pIG3006; 470 ng/µl for pIG3001; 71 ng/µl for pIG3003.

Test digest of Gibson assembly 3

31.05.2013

Gel run

04.06.2013

Transfection of pIG3001, 3, 4, 6 & 8

HeLa cells seeded onto cover slides in a 24 well plate were transfected by the following protocol:

• 0.75 ng of DNA per well were filled up to 50 µl with OptiMEM
• 2.5 µl of PEI per well were filled up to 50 µl with OptiMEM

These two solutions were mixed by immediately 2x vortexing for ~ 5 s. After 20 min incubation 100 µl were added dropwise to each well.

Transfection scheme:

05.06.2013

Second Miniprep of Gibson assembly 3

As the sequencing of the only positive colony of pIG3007 pointed out a mutation, more colonies were prepped using High Pure Plasmid Isolation Kit of Roche.

Yield: ~ 60 ng/µl

Second test digest of Gibson assembly 3

Gel run

06.06.2013

4-OHT treatment

4-OHT was diluted in DMEM complete to a final concentration of 0.1, 1 and 10 µM; EtOH was diluted in DMEM complete to a final concentration of 0.1 and 1 % (which is the same amount as in the medium with 4-OHT, as 4-OHT is dissolved in EtOH).

The old medium was removed from the cells and the new mixed media were added according to the transfection scheme.

Cell fixation

After 0.5, 1 and 3 h (according to the transfection scheme) cells on each well were washed with 500 µl PBS and fixed with 200 µl PFA (4 %) solution by incubating for 10 min on ice and at least 20 min at RT.
Cells attached on cover slides were stained with DAPI and DRAQ5 (incubation in DAPI or DRAQ5 solution consisting of 1 µl DAPI or DRAQ5 in 5 ml dH2O for 5 s, respectively) and rinsed in dH2O. Cover slides were dried and mounted on a drop of Mowiol solution (with DABCO) with cells down. After a drying step at 37 °C for 15 min samples were sealed with nail polish and stored at 4 °C.

Midiprep of pIG3002, 3, 5 & 7

As the sequencing results were positive, plasmids were amplified and midiprepped according to the manual of Jetstar Plasmid Purification MIDI Kit

Yield: 1.7 µg/µl for pIG3005; 670 ng/µl for pIG3007; 540 ng/µl for pIG3002; 335 ng/µl for pIG3003.

07.06.2013

Microscopy

• All samples showed red flourescence (except of pIG3006 & 8 treated with 10 µM 4-OHT, as there were almost no cells).
• Treatment with 0.1 µM 4-OHT did not cause a difference to treatment with EtOH.
• Treatment with 1 µM 4-OHT seemed to increase nuclear import for pIG3006 & 8.
• pIG3006 is always localized in the nucleus.
• By cell shape concentrations of 4-OHT lower than 10 µM does not seem to harm HeLa cells.

10.06.2013

Midiprep of pIG3009

As experimental results indicate, that the 5' NLS has a maybe stronger influence on nuclear import than the 3' NLS, the wrong assembled plasmid with the insert HA-ERT2-NLS-Cas9-mCherry (:= pIG3009) was amplified and midiprepped according to the manual of Jetstar Plasmid Purification MIDI Kit

Yield: 300 ng/µl.

11.06.2013

Transfection of all constructs

HeLa cells seeded onto cover slides in a 24 well plate were transfected by the following protocol:

• 0.75 ng of DNA per well were filled up to 50 µl with OptiMEM
• 2.5 µl of PEI per well were filled up to 50 µl with OptiMEM

These two solutions were mixed by immediately 2x vortexing for ~ 5 s. After 20 min incubation 100 µl were added dropwise to each well.

Transfection scheme:

12.06.2013

4-OHT treatment

4-OHT was diluted in DMEM complete to a final concentration of 0.1 and 1 µM; EtOH was diluted in DMEM complete to a final concentration of 0.1 % (which is the same amount as in the medium with 4-OHT, as 4-OHT is dissolved in EtOH).

31 h after transfection the old medium was removed from the cells and the new mixed media were added according to the transfection scheme.

Cell fixation

After 3 and 16 h (according to the transfection scheme) cells on each well were washed with 500 µl PBS and fixed with 200 µl PFA (4 %) solution by incubating for 10 min on ice and at least 20 min at RT.
Cells attached on cover slides were stained with DAPI and DRAQ5 (incubation in DAPI or DRAQ5 solution consisting of 1 µl DAPI or DRAQ5 in 5 ml dH2O for 5 s, respectively) and rinsed in dH2O. Cover slides were dried and mounted on a drop of Mowiol solution (with DABCO) with cells down. After a drying step at 37 °C for 15 min samples were sealed with nail polish and stored at 4 °C.

13.06.2013

Toxity assay for 4-OHT

Untransfected HeLa cells were treated for one day with 4-OHT, EtOH (different concentrations, each) or no addition. Supernatant was removed and a washing step with 0.5 ml PBS was performed. The cells in the supernatant and PBS were counted with CASY counter. The number of dead cells was calculated by multiplying the number of living cell with (100 - percentage of living cells) / 100.

Confocal fluorescence microscopy

Pictures were taken of all different constructs by a confocal fluorescence microscope. The ration of the mean nuclear to cytoplasmic red flourescence was determined by ImageJ.

No significant difference in subcellular localisation upon 4-OHT stimulus was detectable this way.

19.06.2013

Second transfection of all constructs

HeLa cells seeded onto cover slides in a 24 well plate were transfected by the following protocol:

• 0.75 ng of DNA per well were filled up to 50 µl with OptiMEM
• 2.5 µl of PEI per well were filled up to 50 µl with OptiMEM

These two solutions were mixed by immediately 2x vortexing for ~ 5 s. After 20 min incubation 100 µl were added dropwise to each well.

Transfection scheme:

20.06.2013

4-OHT treatment

4-OHT was diluted in DMEM complete to a final concentration of 1 and 5 µM; EtOH was diluted in DMEM complete to a final concentration of 0.1 % (which is the same amount as in the medium with 4-OHT, as 4-OHT is dissolved in EtOH).

31 h after transfection the old medium was removed from the cells and the new mixed media were added according to the transfection scheme.

21.06.2013

Cell fixation

After an over night incubation cells on each well were washed with 500 µl PBS and fixed with 200 µl PFA (4 %) solution by incubating for 10 min on ice and at least 20 min at RT.
Cells attached on cover slides were stained with DAPI and DRAQ5 (incubation in DAPI or DRAQ5 solution consisting of 1 µl DAPI or DRAQ5 in 5 ml dH2O for 5 s, respectively) and rinsed in dH2O. Cover slides were dried and mounted on a drop of Mowiol solution (with DABCO) with cells down. After a drying step at 37 °C for 15 min samples were sealed with nail polish and stored at 4 °C.

Fluorescence microscopy

No big difference between 4-OHT and EtOH treatment was detectable.

25.06.2013

Transfection for western blotting

HEK cells seeded in three 6 well plates were transfected with pIG3001, 2, 5, 7 & 9 by the following protocol:

• 3.75 ng of DNA per well were filled up to 250 µl with OptiMEM
• 12.5 µl of PEI per well were filled up to 250 µl with OptiMEM

These two solutions were mixed by immediately 2x vortexing for ~ 5 s. After 20 min incubation 500 µl were added dropwise to each well.

26.06.2013

4-OHT treatment

4-OHT was diluted in DMEM complete to a final concentration of 1 µM; EtOH was diluted in DMEM complete to a final concentration of 0.1 % (which is the same amount as in the medium with 4-OHT, as 4-OHT is dissolved in EtOH).

30 h after transfection the old medium was removed from the cells and the new mixed media were added to the wells, both 4-OHT and EtOH for each construct.

27.06.2013

Cell fractionation

Cells were washed twice with 1 ml PBS, then incubated for 30 min on ice with 0.5 ml hypotonic lysis buffer (20 mM HEPES pH=7.4; 5 mM MgCl2; 1 mM EDTA; 1 Protease inhibitor cocktail tablet / 50 ml buffer). After mechanical detachment lysates were centrifuged for 5 min at 10,000 g. Supernatant and pellet were separated.

Sample preparation for SDS-PAGE

200 µl of supernatants were mixed with 50 μl of 5x SDS loading buffer (10 % SDS; 0.3125 M Tris-HCl pH=6.8; 50 % glycerol, 12.5 % 2-Mercaptoethanol; 0.025 % Bromphenol blue) and heated for 5 min at 95 °C. The pellets resuspended in 15 μl 5x SDS loading buffer and heated for 5 min at 95 °C were diluted with 120 μl hypotonic lysis buffer and another 30 μl SDS loading buffer (5x) and sonified for 10 min at maximum.

SDS-PAGE cast

At first the separation gel was cast and covered with 200 μl isopropanol. After polymerisation the collection gel was cast on top.

Western blotting

A PVDF-membrane was activated in methanol and washed in transfer buffer (192 mM glycin; 25 mM Tris; 10 % methanol). 3 sheets of whatman paper were incubated in transfer buffer, too. The blotting apparatus was loaded in the following order from bottom up: 2 sheets of whatman paper - PVDF- membrane - gel - 1 sheet of whatman paper. An amperage of 0.35 A per membrane was supplied for 1.5 h.

27.06.2013

Antibody treatment

Membranes were incubated for 1 h in blocking buffer (PBS with 3 % milk powder), then for 2.5 h with anti HA mouse (1:1000 in blocking buffer). After 3 times washing for 5 min with PBS-T (PBS with 0.05 % Tween 20) membranes were incubated for 1 h with anti mouse HRP (1:5000 in blocking buffer) and washed again 3 times for 5 min with PBS-T.
Imaging was performed with automatically determined exposure time after addition of ECL I (250 mM luminol; 90 mM coumaric acid; 1 M Tris pH=8.5) + ECL II (30 % hydrogen peroxide; 1 M Tris pH=8.5) solution (500 μl of each).

These data suggest that altering the subcellular localization of a Cas9 fusion protein upon a 4-OHT stimulus is not possible. Because of this it ought to be tested, if the functionality of Cas9 can be controlled by hormone induction. Thus, in a new experiment a SEAP plasmid should be targeted.

RNA Plasmid for SEAP Assay

pX334a digested with PstI and religated afterwards ("pIG3010") was used as initial plasmid for the introduction of crRNAs (oligos designt for targeting two different SEAP loci).

14.07.2013

Digest of pX334a

Cas9 was cut out of pX334a to get a plasmid containing only the tracrRNA and the crRNA.

Gel run

15.07.2013

Gel extraction

DNA was purified using High Pure PCR Product Purification Kit of Roche.

Changes to the protocol:

• incubation at 56 °C for 10 min for gel dissolving
• elution with dH₂O (incubation at 50 °C for 4 min before centrifugation)

Yield: 30 ng/µl

Religation of pX334a backbone

Transformation

16.07.2013

Picking of colonies

4 colonies were spread on a 1/4 plate.

17.07.2013

Miniprep

DNA was purified using High Pure Plasmid Isolation Kit of Roche.

Yield: ~ 75 ng/µl

Oligo annealing

Ordered oligos (single stranded) were annealed to create the insert for the crRNA locus:

oIG3013 & oIG3014 for Targetsequence I oIG3015 & oIG3016 for Targetsequence II

Mix:

ingredient	volume
Oligo 1 (100 µM)	50 µl
Oligo 2 (100 µM)	50 µl
dH2O	150 µl

Incubation at 98 °C for 4 min, then let cool down for 3 h (in turned off heating block)

18.07.2013

Digestion of pIG3010 with BbsI

RNA plasmid was opened in order to insert the crRNA coding sequences.

Gel run

Gelextraction

DNA was purified using High Pure PCR Product Purification Kit of Roche.

Changes to the protocol:

• incubation at 56 °C for 10 min for gel dissolving
• elution with dH₂O (incubation at 50 °C for 4 min before centrifugation)

Yield: 40 ng/µl

Insertion of annealed Oligos

Digested pIG3010 was ligated with oligo I or II in a 1:3 or 1:6 ratio.

Transformation

19.07.2013

Picking of colonies

2 colonies of each plate were spread on a 1/4 plate.

20.07.2013

Miniprep

DNA was purified using High Pure Plasmid Isolation Kit of Roche.

Only 1 colony of each ligation approach was prepped.

Yield: ~ 150 ng/µl

Test digest

Gel run

20.07.2013

Colony PCR

Fwd. primer: fwd. oligo of insert (oIG3013 for pIG3011 & oIG3015 for pIG3012); rev. primer: Gibson primer of Cas9 (oIG3004).

Control: Fwd. primer: Cas9 sequencing primer (oIG0015); rev. primer: Gibson primer of Cas9 (oIG3004).

Gel run

22.07.2013

Repeat of Insertion of annealed Oligos

Ligation of pIG3010 with SEAP-Oligos I and II.

Miniprep

DNA of 4 more colonies (2x pIG3011 + 2x pIG3012) were purified using High Pure Plasmid Isolation Kit of Roche.

Yield: ~ 300 ng/µl

Test digest with new colonies

Gel run

Sequencing

pIG3011-65 (1:6 ligation, colony 5) and pIG3012-61 (1:6 ligation, colony 1) were sequenced with oIG0015.

Both sequencings indicate that the sequenced plasmids are pIG3010. Thus, the BbsI digest did not work.

23.07.2013

Repeat of opening pIG3010

Gel run

Gel extraction

DNA were purified using High Pure Plasmid Isolation Kit of Roche.

Changes to the protocol:

• incubation at 56 °C for 10 min for gel dissolving
• elution with dH₂O (incubation at 50 °C for 4 min before centrifugation)

Yield: 120 ng/µl

24.07.2013

Repeat of insertion of annealed Oligos

Ligation of digested pIG3010 with SEAP-Oligos I and II.

25.07.2013

Coloy PCR on pIG3010 with target sites SEAP

Colonies were picked and transferred into the following master mix. Afterwards they were streaked out onto plates, containing Amp as selective.

oIG3013I and 3015II were used as forward primers, oIG3004 as reverse primer.

Miniprep

DNA of 6 colonies (3x pIG3011 + 3x pIG3012) were purified using High Pure Plasmid Isolation Kit of Roche.

Yield: ~ 30 ng/µl

26.07.2013

Test digest

Gel run

Sequencing

pIG3011_3 and pIG3012_2 were sequenced with oIG0015. Unfortunately they turned out to be undigested pIG3010.

2nd repeat of opening pIG3010

Trafo of digested pIG3010

To test if there is still undigested plasmid in the sample of digested pIG3010, E. coli were transformed with 40 ng of this sample and - as a control - with 40 ng of undigested pIG3010.

Digest of pIG3010 with BbsI (Alina and Philipp)

As the digest of pIG3010 seems to have still a lot of undigested backbone, digestion was repeated.

29.07.2013

Repeat of insertion of annealed Oligos

Ligation of digested pIG3010 with SEAP-Oligos I and II.

31.07.2013

Miniprep

DNA was purified using High Pure Plasmid Isolation Kit of Roche.

8 colonies of each ligation approach was prepped.

Yield: ~ 250 ng/µl

randomized samples were sent for sequencing.

31.07.2013

Sequencing results

pIG3011_4 and pIG3012_7 proved themselves to be correct. 100ml LB containing Amp were inoculated with these strains, as well as the CMV:SEAP construct.

02.08.2013

Midiprep of pIG3011 and pIG3012

DNA was purified using Jetstar Plasmid Purification midi kit.

Yield: ~ 2,5µg/µl

04.08.2013 (Alina & Philipp)

Seeding of cells for functioal test of ERT as catalytic inhibitor of CAS9.

As the plasmids are ready, HEK293T cells were be seeded in 24 wells with 65.000 cells each well. This will allow a functional test of possible inhibtory effects of Cas9:ERT. A quantitative SEAP essay should give answer to the question wether we can induce CRISPRi via Tamoxifen.Seeding was performed according to standard protocol.

06.08.2013

Transfection

Transfection scheme:

07.08.2013

Medium change

12 h after transfection DMEM complete was removed and replaced by 0.5 ml per well DMEM complete containing 1 µM 4-OHT or 0.1 % EtOH, respectively, according to the transfection scheme.

08.08.2013

Medium change

24 h later medium was changed again according to the transfection scheme, this time with a washing step (0.5 ml DPBS per well).

09.08.2013

SEAP measurement

The following was done 22 h after the last medium change (58 h after transfection) with technical triplicates.

• 400 µl of cell supernatant were collected in Epis.
• Incubation for 30 min at 65 °C.
• Centrifugation for 1 min at 1250 g.
• 100 µl of SEAP buffer were filled in the wells of a 96 well plate.
• Addition of 80 µl supernatant to each well.
• Addition of 20 µl pNPP (substrate).
• 96 plate was immediately placed in the blade reader.

Spectroscopic measurement every minute for 150 times; wavelenght 405 nm.

Measurement was aborted, as the SEAP concentration was too high.

10.08.13

Repeat of SEAP measurement

Cell supernatant was diluted 1:10 with DMEM that was heated for 30 min at 65 °C and measurement was repeated.