Genome-wide KO CRISPR-Cas9 screen on Haploid human embryonic stem cells with TP53 or MLH1 LoF
Wash cells with PBS x2. Trypsinize (TrypLE Select) the wells with the regular protocol. Spin down the cells after neutralizing the trypsin with a serum-containing medium. Count cellsfreeze pellet gSYNC DNA Extraction Kit (GS100) prepare mix inside a PCR hood, after cleaning the surface with DNase Away and70% EtOH. If possible, we recommend setting up at least 4 parallel PCRs for a given sample.Final contents of each reaction:• 10 μL 10x reaction buffer• 8 μL dNTP• 0.5 μL P5 primer mix, 100 μM• 1.5 μL ExTaq polymerase• up to 10 μg of genomic DNA or 200 ng of plasmid DNA• 10 μL of P7 primer 5 μM• up to 100 μL with water1. Make a master mix of reaction buffer, dNTP, P5 primer mix, taq polymerase, and water.Aliquot into a PCR plate.2. Add template DNA.3. Add a unique P7 primer to barcode each individual reaction.Thermal cycler parametersWait for block to reach 95°C before adding samples.1. 95°C, 1 minute2. 95°C 30 seconds (denaturation)3. 53°C 30 seconds (annealing)4. 72°C 30 seconds (extension)Back to step 2, total of 28 cycles5. 72°C 10 minutes6. 4°C forever