2D Cas-CLOVER with Labels & Arrows

Cleaner Gene Editing With Cas-CLOVER™

Our Cas-CLOVER gene editing technology helps eliminate off-target mutations, has been validated in plants, mammalian cells and yeast and is available through simple licenses.

2D Cas-CLOVER with Labels & Arrows

The Cas-CLOVER gene editing technology has undetectable off-target activity and stand alone patent protection for licensing simplicity and clarity in freedom to operate.

Evaluate Cas-CLOVER, with no strings attached, in-house or collaborate with us to execute your proof of concept studies. Then, if you choose, partner with us for accessible commercial focused licenses for the areas of agriculture (plants & animals), industrial biotechnology (yeast) and pharmaceutical bioprocessing (mammalian cells) for a more rewarding gene editing experience.

2D Clo051 with Labels

More Precision,
High Efficiency, Flexible Design, Larger Deletions & Simpler Screening

Cas-CLOVER’s dCas serves as a fusion protein only. It is mutated and unable to cut DNA. As opposed to the use of a single guide RNA (gRNA) like in CRISPR, the Cas-CLOVER system utilizes two gRNAs in addition to the Clo051 nuclease activity that requires dimerization of subunits associated with each guide RNA. This allows for more stringent DNA cleavage. Using two gRNA makes the Cas-CLOVER gene editing system highly targeted and only functional when the paired gRNAs dimerize at the correct target site.

2D Clo051 with Labels
Demeetra - Product - Cas-CLOVER Demonstrated Accuracy Figure

Demonstrated Accuracy

The image shows ultra-low potential off-targets in an unbiased iGUIDE-seq study presented at the Poseida Therapeutics R&D day 2021.

Proven Efficiency

Tobacco is tetraploid, accordingly 4 copies of target genes must be deleted to render a full knockout. Here is an example of tobacco editing efficiency with Cas-CLOVER, where 0%= no cutting, 25%=one allele, 50%=two alleles, 75%=3 alleles and 100%=all 4 alleles cut. The vast majority of the 70+ individual plants have between 2-4 alleles knocked out.

Demeetra - Product - Cas-CLOVER Proven Efficiency Figure
2D Cas-CLOVER Sequence Target

Flexibility for Choosing Target Sequence

Clo051 nuclease allows for a flexible spacer region of 15–30 base-pairs between guides. Cas-CLOVER requires two gRNAs to function but the flexibility of Clo051 enables simple target designs for multiple loci in any gene.

Larger Deletions

Another advantage of Cas-CLOVER’s two gRNA targeting system is it generally results in larger deletions around 8-50 base-pairs (bp) to CRISPR/Cas9’s 1-3 bps. Edited cells, yeast or plants can thus be positively identified by running quick and easy gels in-house; streamlining your workflows and saving the time and resources, instead of sending samples out for sequencing.

Demeetra - Product - Cas-CLOVER Larger Deletions Figure
Demeetra AgBio

Simple To License

Current gene editing tools, particularly CRISPR, are held back by confusing intellectual property restrictions. This lack of commercial freedom to operate has limited CRISPR’s applications.

It is our mission to make technology accessible. Due to the distinct science involved, Cas-CLOVER is covered under a set of patents separate from other technologies and is easy to license.

It’s exclusively licensed and sublicensed by Demeetra AgBio for agriculture, synthetic biotechnology, and pharmaceutical bioprocessing. Start your evaluation now by starting the process of ordering reagents today.

Validated In CHO Cells, Yeast and Plants

We specialize in multiple industries, allowing us to apply Cas-CLOVER and piggyBac
technologies into broad real world applications.

Demeetra AgBio

Pharmaceutical Bioprocessing

Bioprocessing and cell line engineering to produce human or non-human therapeutics

Yeast Icon big

Synthetic Biotechnology

Bioprocessing and strain improvement to produce therapeutics, industrial enzymes, compounds or biofuels

Plant Icon

Agriculture Biotechnology

Enable plant modifications that may not require GMO labels and for the production of novel therapeutics

How Cas-CLOVER Works

View the specifics of Cas-CLOVER’s mechanism.

Demeetra AgBio


Easily designed and deployed reagents

Demeetra AgBio


Fast, dCas-guided sequence recognition

Demeetra AgBio


2 gRNAs match target and subunit dimerizes before cleavage

Demeetra AgBio

Explore Gene Editing Reagents Online

Select reagents for use in plant, yeast, and animal genomes by visiting our easy-to-use catalog page. After requesting a quote and signing a simple royalty-free MTA form, you will receive our basic use protocol - which includes maps; sequences; and instructions on the design and production of gRNAs.


We utilize Cas-CLOVER as our go-to gene editing technology for many reasons. However, the requirement of a GG “PAM” binding site is technically a constraint on Cas-CLOVER and other gRNA-dependent biotechnologies like CRISPR-Cas9.

TAL-CLOVER remedies this since it only requires a “T” anchor.

Demeetra AgBio

New TAL-CLOVER: More Flexible Than CRISPR and gRNA-based Gene Editing

Related Resources

Check out our latest content on Cas-CLOVER.

Scientists Trust Our Gene Editing Technology

Demeetra AgBio

“We are very happy with the efficiency of the targeted mutations we are getting with Cas-CLOVER in mammalian cells. It is impressive that although Cas-CLOVER requires dimerization it still has very high efficiency similar to CRISPR/Cas9. The one aspect of Cas-CLOVER that stood out for us was its ease of use. We have been working with CRISPR/Cas9 for many year now and Cas-CLOVER just fit in very nicely with our existing workflow for gene-editing with Cas9 or Cas9 nickase.”

Demeetra AgBio

Tseten Jamling, PhD.

Head of Molecular Biology
Bristol Myers Squibb

Demeetra AgBio

On my experience using cas-CLOVER…the uniqueness adds to the specificity of the system.“The flexibility of the guide RNA design makes the system easy to use and gives high specificity due to the use of the two guide RNAs. It is very efficient due to the ability of the dead Cas9s to recognize the current area of DNA, and since the clo51 nuclease can only cut when dimerized, the system has high fidelity.

Demeetra AgBio

Kayla Bean, Ph.D.

Research Scientist, Discovery Research
Elanco Animal Health

We Can Help Optimize Your Research

Contact us to learn more about Cas-CLOVER can help accelerate your research.