CompoZr™ ZFN Technology for CHO Cell Engineering
Rapid and Precise Engineering of Mammalian Cells for cGMP
Manufacturing of Protein Pharmaceutical Products
Features and Applications of CompoZr™ ZFN Technology
Value Proposition for Large-scale Biopharm Producers
Validation in the Scientific Literature and Across Multiple
Applications in Healthcare, Agriculture and Life Science Research
Working with Sigma-Aldrich
Features of CompoZr™ ZFN Technology
One-step gene knockout, knock-in or correction at ANY genomic address
No selection required: 1-20% frequency of targeted modification in transfected pool
Bi-allelic knockouts are routine—ZFN modifications are not limited by copy number
Targeted integration of therapeutic genes in parental cell lines
Modifications are precise, permanent and heritable
6-26 weeks to genotype and preliminary phenotype of bi-allelic knockouts
CompoZr ZFN is fully validated with multiple publications and collaborator data across multiple
applications in healthcare, agriculture and industry
• CompoZr™ ZFN Shortens Time-to-IND
• GS-/-, DHFR-/-, FUT8-/-, BAX-/- & BAK-/- clones can be generated in a single step
• 2X (BAX/BAK) and 3X (GS/DHFR/FUT8) combinations of these and other traits
• Targeted integration to maximize yield and reduce clonal variation
• High-value Product Attributes (e.g., glycosylation)
• Improve efficacy, toxicity and PK profiles by altering glycosylation
• Remove Endogenous Proteins That Co-purify with Protein Product
• Eliminate endogenous CHO cell proteins that co-purify with therapeutic product
• Remove Viral Elements from Host Cell Genome
• Reduce QC costs from viral elements that generate false positives
• Reduce/Eliminate Byproducts of Host Cell Metabolism (e.g., lactate)
Zinc Finger Nucleases (ZFNs)
• DNA binding domains have 4-6 zinc fingers, binding 12-18 bp
• The two ZFNs bind as heterodimers mediated by the cleavage domain
• The heterodimeric structure is required for cleavage
Mechanism of Genome Editing with ZFNs:
A One-Step Process in the Lab
Step 1: The ZFN cleaves the target at a specific location.
Step 2: The cell does the rest, by one of two mechanisms.
Non-homologous End Joining Homology-dependent Repair
Imperfect repair Precise repair
Targeted gene knockout Targeted integration
Incorrect repair disrupts gene Inserted transgene, mutation, correction
Loss and/or gain of function
Loss of function
Using a ZFNs to
Create DHFR-/- CHO Cell Lines
Santiago et al, 2008, PNAS 105, 5809.
CompoZr™ ZFN Technology is
Fully Validated in CHO Cell Engineering
ZFN Genome Editing, ZFP
Transcriptional Activation in CHO Cells
1. Malphettes L et al. “Highly-efficient deletion of FUT8 in CHO cell lines using zinc-finger
nucleases yields cells which produce completely non-fucosylated antibodies.” Biotechnol.
Bioeng. (online in advance of publication 4/8/10).
2. Liu P-Q et al. “Generation of a triple-gene knockout mammalian cell line using engineered
zinc-finger nucleases.” Biotechnol. Bioeng. 106:97 (2010).
3. Cost GJ et al. “BAK and BAX deletion using zinc-finger nucleases yields apoptosis-
resistant CHO cells.” Biotechnol. Bioeng. 105:330 (2009).
4. Santiago Y et al. “Targeted gene knockout in mammalian cells using engineered zinc finger
nucleases.” Proc. Natl. Acad. Sci. USA 105:5809 (2008).
5. Reik A et al. “Enhanced protein production by engineered zinc fingers proteins.”
Biotechnol. Bioeng. 97:1180 (2007).
ZFN Genome Editing in
Human Cells and Other Model Systems
1. Hockmeyer, D. et al. Efficient targeting of expressed and silent genes in human ESCs and iPSCs using zinc-finger
nuclease. Nat. Biotech. 27:851 (2009).
2. Perez, EE et al. Establishment of HIV-1 resistance in CD4+ T cells by genome editing using zinc-finger nucleases. Nat.
Biotech. 26:808 (2008).
3. Lombardo, A et al. Gene editing in human stem cells using zinc finger nucleases and integrase-defective lentiviral vector
delivery. Nat. Biotech. 25:1298 (2007).
4. Moehle, EA et al. Targeted gene addition into a specified location in the human genome using designed zinc finger
nucleases. Proc. Natl. Acad. Sci. USA (2007).
5. Urnov, FD et al. Highly efficient endogenous human gene correction using designed zinc-finger nucleases. Nature
6. Geurts AM et al. “Knockout rats via embryo microinjection of zinc-finger nucleases.” Science 325(5939):433 (2009).
7. Shukla VK et al. “Precise genome modification in the crop species Zea mays using zinc-finger nucleases.” Nature
8. Doyon Y et al. “Heritable targeted gene disruption in zebrafish using designed zinc-finger nucleases.” Nat. Biotech.
9. Beumera, KJ et al. “Efficient gene targeting in Drosophila by direct embryo injection with zinc-finger nucleases.” Proc.
Natl. Acad. Sci. USA 105(50):19821 (2008).
10. Lloyd, A et al. Targeted mutagenesis using zinc-finger nucleases in Arabidopsis. Proc. Natl. Acad. Sci. USA 102(6):2232
Genome Editing of Mammalian Cell Lines (Sigma-Aldrich)
Bi-allelic disruption of deleterious genes
Targeted insertion, trait stacking
Alteration of glycosylation
Cost/time efficiencies vs. homologous recombination
Therapeutic Genome Editing (Sangamo BioSciences)
Gene disruption (i.e., HIV/AIDS)Phase I
Gene correction (i.e., X-linked SCID, glioblastoma)IND
Enhancement of Commercial Crops (Dow Agrosciences)
EXZACT Precision Traits for yield, insect resistance, drought resistance
Features of targeted integration, trait stacking were key to DAS investment
ZFN-Knockout Animal Models (Sigma-Aldrich)
Unlimited species, </=3 months to founder colony
10-15% frequency of knockout phenotype in founder generation