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Synthetic CRISPR RNA and Cas9 Nuclease Reagents for Gene Editing

CRISPR/Cas9-mediated gene editing is a powerful technique that allows you to create knock-in/out mutations in any gene and any cell. CRISPR/Cas9 is advantageous over other forms of gene editing, such as TALENs and zinc finger nucleases, because it is simpler to implement and edits at higher efficiency.

GenScript licenses CRISPR technology from the Broad Institute of MIT and Harvard. Our offerings include the latest CRISPR plasmids and databases developed by the CRISPR pioneering Feng Zhang laboratory.


GenScript CRISPR RNAs (crRNAs) are short 36 nt RNA oligonucleotides which contain a short 20 nt sequence which guide the CRISPR/Cas9 complex to genomic targets for gene editing.

Product length Quantity Pricing
GenCRISPR crRNA 20 nt 2 nmol $95 Order
GenCRISPR crRNA 20 nt 10 nmol $125 Order
GenCRISPR crRNA 20 nt 20 nmol $225 Order

CRISPR/Cas9 tracrRNAs

GenScript CRISPR/Cas9 trans-activating crRNAs (tracrRNAs) are 67 nt RNA oligonucleotides which together with the crRNA and Cas9 nuclease, form the activated CRISPR/Cas9 ribonucleoprotein complex.

Product Quantity Pricing  
GenCRISPR tracrRNAs 5 nmol $95 Order
GenCRISPR tracrRNAs 10 nmol $125 Order
GenCRISPR tracrRNAs 20 nmol $225 Order

Cas9 Protein

Cas9 protein is the CRISPR-associated nuclease which enzymatically cleaves DNA and enables gene editing. GenScript Cas9 contains a N-terminal nuclear localization signal (NLS) and C-terminal NLS, for optimized nuclear compartmentalization.

Product Quantity Pricing  
GenCRISPR Sp Cas9 Nuclease 2NLS 10 µg, 1µg/µL $95 Order
GenCRISPR Sp Cas9 Nuclease 2NLS 25 µg, 1µg/µL $195 Order

CRISPR/Cas9 Control Kit

GenScript offers pre-duplexed human HPRT crRNA:tracrRNA as positive controls for your CRISPR experiments. HPRT (hypoxanthine phosphoribosyltransferase) is a housekeeping gene and commonly used control has already been pre-validated for efficient CRISPR cleavage. The kit comes with an HPRT primer mix for PCR analysis.

Product Pricing  
GenCRISPR/Cas9 Control Kit $195 Order

Synthetic crRNA/tracrRNA

CRISPR/Cas9 ribonucleoprotein (RNP) complexes are composed of a CRISPR RNA (crRNA), trans-activating crRNA (tracrRNA) duplex and Cas9 protein. The crRNA consists of a 20 nt sequence that is complementary to a genomic target. crRNA sequence design utilizes standard gRNA design principles and sequences can be easily selected from the GenScript gRNA database or customized using the GenScript gRNA design tool. When complexed with tracrRNA and Cas9 protein, a double strand break will be created at a locus complementary to the 20 nt guide RNA sequence, 3-4 bp upstream from a protospacer adjacent motif (PAM) sequence (5'-NGG-3'). Unlike traditional CRISPR Plasmids, CRISPR/Cas9 ribonucleoproteins are delivered as intact complexes, and do not require cellular expression.

CRISPR RNA/Cas9 Protein Workflow

Only three steps are required for using synthetic CRISPR RNA oligos:

  1. Incubate the crRNA and tracrRNA with the annealing buffer
  2. Incubate the duplexed crRNA:tracrRNA with Cas9 protein to form the active CRISPR/Cas9 ribonucleoprotein. Optionally, an HDR (homology dependent repair) template can also be co-delivered with the Cas9 RNP for targeted knock-in.
  3. Deliver the ribonucleoprotein mix into the cells
Cas9 RNP

Prior to experimentation, we recommend first testing your CRISPR/Cas9 complex in vitro and in test cell lines to ensure cleavage and transfection efficiency. Delivery of the CRISPR/Cas9 complex into cells is typically performed by electroporation or via lipid-mediated transfection.

CRISPR Handbooks and Protocols

CRISPR Handbook

CRISPR/Cas9 Protein & RNA FAQs

  • What are your CRISPR plasmid delivery specifications? Read More »

  • Deliverables:

    • 2-20 nmol of crRNA and/or tracrRNA
    • tracrRNA is provided with annealing buffer
    • Available in lyophilized format


    • HPLC verification
    • Quality assurance certificate
  • What are your Cas9 Protein delivery specifications? Read More »

  • Deliverables:

    • 10-25 μg of Cas9-2NLS protein
    • Available in lyophilized format


    • Quality assurance certificate
  • How many crRNA sequences are needed for targeted knock-out? Read More »

  • A minimum of 3 crRNA sequences are recommended to ensure knock-out and experimental accuracy. Independently obtained knock-out mutants provide redundancy to safeguard against any hidden off-target effects.

  • Do I need an all-in-one or dual vector system? Read More »

  • All-in-one vector systems have two main advantages:

    • Cells only need to be transfected once.
    • gRNA/Cas9 expression is driven in an ideal 1:1 ratio.

    Dual vectors, where Cas9 and gRNA are expressed independently on separate constructs, are more suitable if you plan to express multiple gRNAs for multiplex targeting.  For these applications, Cas9 should first be stably expressed in the cell line, after which the cells can be transfected with different gRNA vectors to generate a cell pool.

  • How to store and use crRNA:tracrRNA oligonucleotides? Read More »

  • Keep the crRNA and tracrRNA oligonucleotides tightly sealed at -20℃ prior to use and avoid repeated freeze-thaw cycles. We recommend working in a sterile environment, using RNAse-free pipette tips and tubes. To dissolve the RNAs, first centrifuge at 6000g for 10 seconds at 4℃, then add DEPC water. Use the following table to dissolve the crRNA:tracrRNA oligonucleotides to 50 pmol/μl.

    Normalized amount delivered (nmol) DEPC water (μl)
    2 40
    5 100
    10 200
    20 400
  • How to store and use Cas9 protein? Read More »

  • Keep the Cas9 vial sealed until use and avoid repeated freeze-thaw cycles, as either may reduce the activity of Cas9 protein. Prior to use, dilute the protein solution using a diluent buffer (10 mM Tris, 300 mM NaCl, 0.1 mM EDTA,1 mM DTT, 50% Glycerol to pH7.4 at 25℃).

  • What amount of Cas9 protein and crRNA:tracrRNA should I use? Read More »

  • It is recommended to use the same amount of Cas9 protein and crRNA:tracrRNA. We have found that 3-6pmol of Cas9 protein and 3-6 pmol of crRNA:tracrRNA are sufficient for each gene editing reaction.

  • How do I use the HPRT positive control? Read More »

  • CRISPR RNA/Cas9 Protein gene editing efficiency testing is best performed in easy-to-handle human cell lines, such as HEK293 cells.

    • Seed well-dissociated cells one day (16-24hrs) prior to transfection in media lacking antibiotics.
    • Incubate cells with transfection reagents. 30-70% confluency at the time of transfection is recommended, as high confluency can negatively impact efficiency.
    • Harvest cells approximately 48hrs after transfection and extract genomic DNA for analysis.
    • PCR amplify genomic fragments using GenScript Human HPRT Primers and verify genome editing efficiency via sequencing or T7E1 digestion assay. Verify that the expected PCR product is obtained

Have questions? GenScript's Ph.D.-level service representatives are available 24 hours a day, Monday through Friday, to assist you.