September

01/09/2010

• gel extraction of amplified cap genes
• 2x DNaseI digestion
  • 1^st try: 0.5µl DNaseI, 90s, majority <100bp
  • 2^nd try: 0.4µl DNaseI, 75s, majority <100bp
  • gel extraction
• 1^st PCR w/o primers
• 2^nd PCR with SAR (o.n.)

02/09/2010

• PCR of day before: (1kb Plus)

• repetition of both PCRs with cap gene fragments of day before by Dirk

• cap gene DNaseI digestion

	3rd try	4th try
VDNaseI	0.3µl	0.2µl
tincubation	75s	60s
gel image 1kb Plus
majority of fragments	<100bp	~1kb

• gel extraction
  • miselution into collection tube

• nucleotide removal
  • c ≈ 37^ng/_µl in 32µl each ⇒ enough for 3 PCRs each

03/09/2010

• both PCRs with cap fragments of day before
  • bands at ~100bp → probably primer binding to small fragments, 1^st PCR not working
  • no bands at ~2kb → no success

06/09/2010

• cap gene DNaseI digestion

	5th try	6th try
VDNaseI	0.25µl	0.25µl
tincubation	75s	75s
gel image 1kb Plus
majority of fragments	~400bp	~300bp

• no gel extraction

• repetition of whole DNA shuffling by Dirk: success
  • assumption: problem at the production of the cap genes → restart of very first PCR the day after

07/09/2010

• amplification of cap genes (1,2,5,6,8,9) out of pBluescript vectors
  • 4 aliquots each, only 2 for AAV9
• gel extraction

08/09/2010

• cap gene DNaseI digestion

	1 (Thomas)	4 (Philipp)	2 (Thomas)	5 (Philipp)
VDNaseI	0.3µl	0.27µl	0.35µl	0.45µl
tincubation	75s	75s	75s	75s
gel image 1kb Plus
majority of fragments	~250bp	widespread	~500bp	<100bp

• gel extraction
• 1^st and 2^nd PCR
  • again failed: 1 left, 4 right
  • expectation: clear bands at ~2.2kb

09/09/2010

• 2^nd PCR of samples 2 and 5:

• desired product at 2.2kb visible
• repetition of 3 more PCR samples for preparation

10/09/2010

• PCR of day before:

• gel extraction of highest clear band from all lanes

⇑ top

10/09/2010

cap Gene Shuffling (starting over again)

cap PCR

PCR to amplify the cap genes from the stock.

• 5 ul cap plasmid (40 ng/ul stock)
• 1 ul M13For
• 1 ul M13Rev
• 10 ul 5x Hifi buffer
• 1 ul Hifi (Quiagen)
• 32 ul H2O

Cycles (Program name: "shuffle 1st"):

• 95 °C for 5 min
• 94 °C for 15 sec |
• 57°C for 30 sec | 40x
• 68 °C for 3 min |
• 72 °C for 10 min
• 4 °C hold

Gel Extraction:

350px

DNAse Digest

cap gene mix (4ug DNA total):

B1/B2 (09/15)  !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

AAV m [ng] c [ng/ul] V [ul]

1 350 121.0 2.9
2 700 115.0 6.1
5 1200 93.0 12.9
6 350 105.0 3.3
8 700 172.0 4.1
9 700 186.0 3.8

H2O 20.5

DNAse Digest:

• 4 ug DNA cap gene mix
• 6 ul 10x buffer
• 0.3 ul DNAse I (invitrogen)

Directly after adding of DNAse:

• Flick tube three times
• Start timer 75 sec
• Quick run on the centrifuge (5 sec)
• Incubate on Thermoblock (Eppendorf)
• Add 6 ul 25 mM, vortex briefly
• Inactivate at 75 °C for at least 10 min

Gel Extraction:

Re-Assembly PCR

500 ng input from purified DNAse digest 10 ul Phusion HF Buffer 1 ul dNTPs 1.5 ul DMSO 0.5 ul Phusion Polymerase ad 50 ul H2O

Amplification PCR

2 ul Re-Assembly PCR product 1 ul SAFor 1 ul SARev 0.5 ul MgSO4 10 ul 5x Hifi Buffer 33.5 ul H2O

Cycles 2-step PCR protocol (Program name: "shuffle phil", left PCR):

95 °C for 5 min 94 °C for 15 sec | 68°C for 3 min | 40x 72 °C for 10 min 4 °C hold

⇑ top

10/09/2010

• PCR of day before:

ToDo

ShufflingSchedule

20/09/2010

• PCR-shuffled capsid genes from AAV serotypes 1,2,5,6,8 and 9 were digested with PacI and AscI overnight at 37ͦC according to the following protocol:

- 15 µg capsid genes. - 7 µL AscI - 7 µL PacI - 20 µL 10X NEB buffer 4 - 2 µL 100X - Up to 200 µL nuclease-free water

• The vector pTR-UF3 was digested with pTR-UF3 using AscI and PacI for 5 hours according to the following protocol:

- 10 µg vector - 2 µL AscI - 2 µL PacI - 5 µL 10X BSA - 5 µL 10X buffer 4 - Up to 50 µL nuclease-free water

21/09/2010

• The digested capsid fragments and the vector were loaded on a 1% agarose gel and ran for 50 minutes. The ~2.2 KB (capsid genes) and ~5 KB (vector) fragments were then purified from the gel.

• A ligation reaction was carried out according to the following protocol:

- ~3.556 µg insert (Capsid genes) - ~2.667 µg vector - 6 µL T4 DNA ligase - 8 µL T4 DNA ligase buffer - Up to 80 µL nuclease-free water - Incubate at 16 ͦC overnight

22/09/2010

• The ligation product from the day before was used to transform electrocompetent cells (Invitrogen), according to the following:

- 600 µL of electrocompetent bacteria were mixed with 62.5 µL DNA from the ligation reaction (about 125 ng per 20 µL bacteria), 20 µL of the mixture were placed in the electoporation cuvette

- Electroporation conditions:

- Recovery of bacteria was done by adding 1 mL LB media to each 20 µL of bacteria that were electroporated. The bacteria were collected in a 200 mL flask and incubated at 37ͦC with shaking at 225 rpm for 1 hour.

The bacteria were then used to inoculate 15 cm petri dishes with ampicillin resistance media. 500 µL were spread on each plate, and 50 plates in total were inoculated. The plates were incubated at 37 ͦC overnight.

23/09/2010

• The plates from the previous day were collected, and 50 colonies were picked and used to inoculate miniprep cultures.

• The colonies from the 50 plates were pooled together and cultured in 700 mL LB for 3 hours, after which a Megaprep (Invitrogen) was done (according to manufacturer's recommendations) to extract the plasmids that contain the shuffled capsid genes and create a library of those shuffled capsids that would be used for the selection of the best capsids, and thus best AAVs.

• A left-over from the transormation from previous day was stored in the fridge and used to inoculate three more 15 cm plates, since the other 50 plates were not suitable for counting the colonies (very crowded!) to estimate the size of the library.

24/09/2010

• 5 flasks (?) of HEK cells were transfected with a total of 75 µg of the library DNA and AAV helper plasmid (1:1) for AAV production, using HBSS. However, the transfection was not successful.

• minipreps of the 50 picked colonies were done, and 10 clones were sent for sequencing. Test digestion with AscI, PacI indicated that the clones picked were positive for the insert (capsid genes).

• Counting of the colonies on the plates from the previous day showed a library size of (...)?

50 more colonies were picked from one of the plates and used to inoculate mini-prep cultures.

25/09/2010

• Analysis of the sequencing results indicated good shuffling of the capsids of two samples, while the 8 others had mainly the sequence of the capsid of AAV5.

• 50 mini-preps of the colonies picked on the previous day were initiated.

27/09/2010

• The 50 samples from the mini-preps from the previous day were test-digested with AscI and PacI, and additionally with NcoI to identify whether AAV5 is present more than the other serotypes. The test digestion with NcoI revealed an AAV5 contamination, so most samples were positive for the AAV5 pattern when digested with NcoI. Sequencing of 10 more samples confirmed this finding.

28/09/2010

• The source of the contamination with AAV5 was identified. The second PCR for the shuffled capsids was repeated.

29/09/2010

• The 2.2 KB band corresponding to cap genes was purified from the gel that was run for the PCR from the previous day. Digestion of the purified cap genes and the pTR-UF3 was done overnight using AscI and PacI according to the same protocol from the previous time.

30/09/2010

• Ligation of the cap genes into the pTR-UF3 vector was carried out accoring to the same protocol from the previous time, the ligation time was 6 hours instead of overnight ligation.

• Transformation of Invitrogen electrocompetent cells was done like the previous time and according to manufacturer's recommendations.