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Genome Engineering Using the
CRISPR-Cas9 System
(Ran FA et al Nature Protocols Vol.8 No.11 2013)
May 6th, 2014
Yudha Nur P...
CRISPR Cas System of Streptococcus pyogenes
Figure 1
DSB-induced DNA-repair mechanisms
Figure 2
http://tools.genome-engineering.org Step 1-2
Developing construct Step 3-5
Step 6-53
Step 54-126
• CRISPR design tool: http://tools.genome-engineering.org
• Design two sgRNAs for each locus and check their efficiency in...
Plasmid construct development strategies:
• sgRNA-encoding primers (PCR-based sgRNA)
• sgRNA-expressing plasmids
sgRNA-enc...
sgRNA construction and delivery
Figure 4
CRISPR web tool results for SENP2 gene
• Best sgRNA sequence candidates:
• Exon 1 (1A): score 95 with 41 off target sites ...
Exon 1 (1A)
Exon 2 (2A)
Design of repair template (optional)
• Single-stranded DNA oligonucleotides (ssODNs)
• For high HDR efficiency:
• ssODNs s...
Plasmid construct validations
• Step 5B xii
• Functional assay:
• Surveyor nuclease assay (step 71-89)
• Sequencing
(the web page provides the primer for
those purpos...
Transfections
• What cells would we use?
• Methods: Lipofectamine 2000 or Amaxa SF cell line 4D-Nucleofector X
kit?
• Reco...
Clonal cell isolation and expansion
• FACS or serial dilution?
Transfection efficiency validations
• Surveyor nuclease assay (step 71-89)
• NHEJ detection:
• Primers should anneal at le...
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Crispr

CRISPR techniques is newly developed technique for genetic manipulations

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Crispr

  1. 1. Genome Engineering Using the CRISPR-Cas9 System (Ran FA et al Nature Protocols Vol.8 No.11 2013) May 6th, 2014 Yudha Nur Patria
  2. 2. CRISPR Cas System of Streptococcus pyogenes Figure 1
  3. 3. DSB-induced DNA-repair mechanisms Figure 2
  4. 4. http://tools.genome-engineering.org Step 1-2 Developing construct Step 3-5 Step 6-53 Step 54-126
  5. 5. • CRISPR design tool: http://tools.genome-engineering.org • Design two sgRNAs for each locus and check their efficiency in the intended cell type • What plasmid would we use? • pSpCas9 (Cas9 alone) • pSpCas9(BB) (Cas9 + invariant sgRNA scaffold and cloning sites) • Do we need to do nicking to minimise the off target mutagenesis?
  6. 6. Plasmid construct development strategies: • sgRNA-encoding primers (PCR-based sgRNA) • sgRNA-expressing plasmids sgRNA-encoding primers (Step 5A) sgRNA-expressing plasmid (Step 5B) • Append sgRNA to U6 promoter template • The resulting amplicons can be co-transfected with a Cas9 expressing plasmid (pSpCas9) • Optimal for rapid screening of multiple candidate sgRNAs (for generating large KO libraries) • Need over 100 bp long • Easy and rapid in comparing sgRNA efficiencies • Oligo pairs encoding the 20-nt guide sequences are annealed and ligated into a plasmid (pSpCas9 or pSpCas9 (BB)) which has sgRNA scaffold and cloning sites for inserting a guide sequences) • 20 bp long • Higher cleavage efficiency They also fused the Cas9 with GFP (2A-GFP or 2A-Puro for screening of transfected cells (pSpCas9(BB)-2A-GFP) for cell screening and selecton.
  7. 7. sgRNA construction and delivery Figure 4
  8. 8. CRISPR web tool results for SENP2 gene • Best sgRNA sequence candidates: • Exon 1 (1A): score 95 with 41 off target sites (2 are in genes) • Exon 2 (2A): score 96 with 31 off target sites (2 are in genes) Don’t forget to add G (guanine) if the first base of sgRNA sequence does not start with G since the U6 RNA polymerase III promoter prefers guanine as the first base of transcript.
  9. 9. Exon 1 (1A)
  10. 10. Exon 2 (2A)
  11. 11. Design of repair template (optional) • Single-stranded DNA oligonucleotides (ssODNs) • For high HDR efficiency: • ssODNs should contain at least 40 bp on each side which are homologous to the target region
  12. 12. Plasmid construct validations • Step 5B xii
  13. 13. • Functional assay: • Surveyor nuclease assay (step 71-89) • Sequencing (the web page provides the primer for those purposes or they can be designed manually, the primers should be 18-25 bp long with melting temp 600C) • NHEJ detection: • Primers should anneal at least 50 bp from Cas9 target site to allow for longer indels detection (Step 90-96). • HDR detection: • RFLP (step 97-108) • The primers should anneal outside the homology arms • Sequencing: Sanger (step 109-117) or deep sequencing (step 118-126) • Transfection • HEK 293FT (step 6-29) • HUES 9 (step 30-53) • Single cell isolation • using FACS (step 54-65) or serial dilutions (step 66-70), then followed by specific clonal cell expansion
  14. 14. Transfections • What cells would we use? • Methods: Lipofectamine 2000 or Amaxa SF cell line 4D-Nucleofector X kit? • Recommendation: triplicates + controls (eg. GFP plasmid)
  15. 15. Clonal cell isolation and expansion • FACS or serial dilution?
  16. 16. Transfection efficiency validations • Surveyor nuclease assay (step 71-89) • NHEJ detection: • Primers should anneal at least 50 bp from Cas9 target site to allow for longer indels detection (Step 90-96). • HDR detection: • RFLP (step 97-108) • The primers should anneal outside the homology arms • Sequencing: Sanger (step 109-117) or deep sequencing (step 118-126)

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