CRISPR Humanized Mouse Model Generation Service
Applied StemCell utilizes its in-licensed CRISPR/Cas9 technology to generate mouse models with precise gene modifications such as knockout, knock-in and point mutation models for a variety of research and preclinical applications.
Learn more about our CRISPR Mouse Model Generation Service.
- Most up-to-date CRISPR design strategies and protocols
- 100% target-site cutting efficiency using validated gRNA
- >99% success rate in generating final mouse model
- Wide variety of genome modifications are available
- F1 breeding to confirm germline transmission
- Electrophysiology and behavioral assessments for your custom mouse models
Efficiency of random transgenesis is dependent on the species and the strain of animal, if any. In mice, depending on the strain of mouse being used, the efficiency can vary between 3-30%. The CRISPR efficiency can be very high if the parameters are optimized for the strain of mouse and type of modification required (such as knockout, knock-in, and conditional knockout). The efficiency of TARGATT™ insertion at preselected safe harbor docking sites (attP sites) averages around 20-30%.
We inject 50 embryos for in vivo validation of gRNAs.
The Cas9 cutting in the test embyros are 80-90% reflective in final pups born.
The choice of gene knock-in technology will depend on the promoter that the transgene will be expressed under. If the knock-in fragment is under control of an endogenous promoter, CRISPR/Cas9 methodology will be adopted. If the transgene expression cassette requires a specific promoter (Ex. CRE expressed under control of a tissue-specific promoter), TARGATT™ technology will be better suited for integrating the transgene.
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Factors affecting genome editing in mouse models using CRISPR/Cas9
Three major factors influence the efficiency of CRISPR/Cas9 in mouse models: the concentrations of Cas9 mRNA, gRNA and donor DNA. Each of these factors are interdependent which in turn affects three other intedependent parameters: the nuclease-mediated cutting rate, gene modification efficiency and birth rate of the pups.
Increasing gRNA and Cas9 concentration improves cutting/editing efficiency but affects birth rate
With increasing gRNA and Cas9 mRNA concentrations, the cutting efficiency increases to almost 97% but birth rate decreases. Therefore, a balance between gRNA and Cas9 concentrations, and birth rate of mice is required for maintaining a reasonable number of embryos microinjected and in turn to optimize birthrate and number of founders born.
Optimal donor concentration is also necessary to maintain balance between gene editing efficiency and birth rate
With increasing donor DNA concentration, the gene editing efficiency of CRISPR system increases but birth rate decreases. An optimal donor concentration of 200 ng/µl is recommended for microinjection in mouse embryos.
Gene editing efficiency and birth rate is also affected by size of insert and length of the homologous regions when using single stranded oligo donor DNA
A technical limitation of ssODN is its length. Most commercial vendors can manufacture up to 200 bases of single stranded DNA molecule. Therefore, homologous regions for a ssODN can be shortenend if insert size gets bigger. The system is perfect for point mutation insertions and can accomodate small fragment inserts up to 100 bp.
Distance between 2 cutting sites must be > 3kb
In projects necessitating 2 modification sites such as generating a conditional knock-out model with 2 LoxP inserts, the distance between cutting sites should be atleast 3 kb for simultaneous modification to avoid deletions between the two cut sites due to efficient NHEJ repair. If the distance between sites is < 3 kb, sequential modification is recommended. The recommended distance between the two insertion sites should be > 6 kb for efficient simultaneous modifications and to limit undesired deletion events.
Summary of our technical discussion about CRISPR gene modification in mouse models
- Optimal conditions are necessary for high efficiency generating mouse models
- Cas9/gRNA/donor DNA concentration; insert size and homology arm length are crucial for balancing cutting rate, gene editing efficiency and birth rate
- The optimal distance between two cutting sites for simultaneous modification is >6 kb
Our affordable Mouse Model Service uses upgraded CRISPR/ Cas9 design strategies, highly optimized CRISPR protocols and validation methods to generate mouse models successfully with a fast turnaround and reduced cost. We have generated > 500 mouse models with very high efficiency and success rate.
Some examples of available genetic modifications in mice include but not limited to:
- Constitutive and conditional knockouts
- Small fragment insertions, point mutations
- Large fragment knock-in: locus specific or safe harbor locus
- Gene tagging/ reporter gene insertion
- Gene replacement, humanized models
- Gene fusion/ translocation
- Gene overexpression, inducible expression, promoter modifications
- Gene editing/ correction to model human diseases
Leverage our extensive scientific expertise in CRISPR/Cas9 and other complementary genome editing technologies such as our proprietary TARGATT™ site-specific knock-in technology and traditional homologous recombination methods in generating a mouse model specific unique to your research niche.
1. Targeting DNA Vector Creation
gRNA Design and Construction (2-4 gRNAs)
A Report on Cloning and Validation
2. CRISPR DNA Pronuclear Microinjection
3. Animal Care, Housing and Genotyping
Pups generated and genotyping showing the proof of precise gene insertion
At least 1 Founder
Case Study# 1: CRISPR Knock-in Model - Generation of site-specific 2 kb large fragment knock-in mouse using CRISPR/Cas9
Goal: To insert a 2 kb large fragment DNA (gene of interest) at “a specified locus” in the mouse genome using CRISPR/Cas9.
The project was designed using a well optimized protocol to generate the transgenic mice: (1) Cas9 mRNA and gRNA were produced by in vitro transcription; (2) donor vector was constructed by in-fusion method: the plasmid contained 1 kb long 5’ and 1 kb long 3’ homologous arms flanking the gene of interest (2kb); (3) the mixture of Cas9 mRNA, gRNA and donor vector was microinjected into fertilized eggs of C57BL/6j mouse background.
Using a panel of genotyping primer pairs, three out of 31 pups born after microinjection (#15, 19, and 26) were identified as founders (F0), with the gene of interest inserted at the desired locus.
Figure 1: Agarose gel electrophoresis of PCR results in F0 mice (#15, 19, and 26) with site-specific gene knock-in. The left part of the gel shows the 5’ junction fragment (2,191 bp), and the right part of the gel shows the 3’ junction fragment (2,557 bp). [wt: wildtype control; M: 1 kb DNA ladder].
Case Study# 2: CRISPR Knock-in Model - Site-specific knock-in of a 27 bp tag in mice using CRISPR/Cas9
Figure: Five (#2, 5, 6 13 and 17) out of nineteen pups, 26%, were genotyped by restriction enzyme digest and sequencing to confirm the correct knock-in on one of the alleles (heterozygotes). A sequence with desired knock-in generated a different cutting pattern compared to its wild type counterpart.
CRISPR Mouse/ Rat Models: Knock-in, Knockout, and Conditional Knockout
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Baker, M. (2014). Gene editing at CRISPR speed. Nature biotechnology, 32(4), 309-313.
CRISPR Knock-in H11 Locus in Pigs
Ruan, J., Li, H., Xu, K., Wu, T., Wei, J., Zhou, R., ... & Chen-Tsai, R. Y. (2015). Highly efficient CRISPR/Cas9-mediated transgene knockin at the H11 locus in pigs. Scientific reports, 5, 14253.
Knock-in, Knockout, Conditional Knock-out
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- Amara, N., Tholen, M., & Bogyo, M. (2018). Chemical tools for selective activity profiling of endogenously expressed MMP-14 in multicellular models. ACS Chemical Biology. doi: 10.1021/acschembio.8b00562.
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*Peng, L., Zhang, H., Hao, Y., Xu, F., Yang, J., Zhang, R., ... & Chen, C. (2016). Reprogramming macrophage orientation by microRNA 146b targeting transcription factor IRF5. EBioMedicine, 14, 83-96.
*Hu, J. K., Crampton, J. C., Locci, M., & Crotty, S. (2016). CRISPR-mediated Slamf1Δ/Δ Slamf5Δ/Δ Slamf6Δ/Δ triple gene disruption reveals NKT cell defects but not T follicular helper cell defects. PloS one, 11(5), e0156074.
*Besschetnova, T. Y., Ichimura, T., Katebi, N., Croix, B. S., Bonventre, J. V., & Olsen, B. R. (2015). Regulatory mechanisms of anthrax toxin receptor 1-dependent vascular and connective tissue homeostasis. Matrix Biology, 42, 56-73.
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*Bishop, K. A., Harrington, A., Kouranova, E., Weinstein, E. J., Rosen, C. J., Cui, X., & Liaw, L. (2016). CRISPR/Cas9-mediated insertion of loxP sites in the mouse Dock7 gene provides an effective alternative to use of targeted embryonic stem cells. G3: Genes, Genomes, Genetics, 6(7), 2051-2061.
For more journal references, please visit our comprehensive list of citations and reference publications.