Protocol for Constructing Guide RNAs Expression Vectors – Joung Lab (February 2013) Reagents needed: 1. 10X Annealing Buffer (recipe for making 1 ml): a. 400 µl 1M Tris @ pH 8 b. 200 µl 1M MgCl2 c. 100 µl 5M NaCl d. 20 µl 0.5M EDTA @ pH8 e. 280 µl H2O 2. BsaI-‐HF restriction enzyme (New England Biolabs) 3. NEBuffer 4 (New England Biolabs) 4. T4 DNA Ligase (New England Biolabs) 5. 2X Quick Ligase Buffer (QLB) (New England Biolabs) 6. Kanamycin 7. Chemically competent XL1-‐Blue cells. Protocol: 1. Digest pDR274 vector (available from Addgene: http://www.addgene.org/crispr/jounglab/CRISPRzebrafish/) using the following conditions: a. 1 µg of pDR274 b. 5 µl BsaI-‐HF c. 5 µl NEB 4 d. H2O to 50 µl 2. Gel isolate digested pDR274 vector backbone 3. Normalize concentration of purified, digested vector to 5 ng/µl in ddH20 4. Anneal two 26 nt oligonucleotides (designed using the web-‐based ZiFiT Targeter program available here: http://zifit.partners.org) in a thermocycler: a. 1 µl 100 µM Oligo 1 b. 1 µl 100 µM Oligo 2 c. 5 µl 10X annealing buffer d. 43 µl H2O e. 95 °C f. -‐1°C per 30 seconds g. 4 °C 5. Ligate annealed oligonucleotides to digested pDR274 vector backbone as follows: a. 1 µl backbone (@ 5ng/µl) b. 3 µl annealed oligo c. 1 µl T4 DNA Ligase d. 5 µl 2X QLB 1 Deepak Reyon
Protocol for Constructing Guide RNAs Expression Vectors – Joung Lab (February 2013) Incubate for 15 minutes at room temperature 6. Transform ligation into XL-‐1 Blue cells as follows: a. 5 µl of ligation b. 45 µl of chemically competent XL1-‐Blue cells c. Ice for 2 min d. 42 ° C for 45 seconds e. Ice for 2 min f. Add 450 µl of LB and recover at 37°C with shaking for 1 hr g. Plate 100 µl on LB plates containing 30 µg/ml kanamycin h. Grow overnight at 37°C 7. Inoculate single colonies into 1ml of LB supplemented with 30 µg/ml kanamycin 8. Grow cultures overnight at 37°C 9. Isolate plasmids using standard mini-‐prep procedure 10. Sequence candidate plasmids using M13 primer (see Hwang et al., Nat Biotechnol. 2013 for sequence). Full sequence of plasmid pDR274 is available here: http://www.addgene.org/42250/sequences/.
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