Arbor has developed a suite of precise gene editing technologies designed to power the next generation of genomic medicines. By enabling access to genetic targets once considered out of reach, Arbor’s platform creates new opportunities to develop therapies for a broader range of diseases and patients.

Patients are beginning to reap the benefits from first-generation CRISPR Cas9-based medicines, but the technology has distinct limitations that hinder its widespread application in novel therapeutics.

At Arbor, we see an opportunity to do more. We are building on the promise of CRISPR-Cas-based gene editing by addressing key limitations of Cas9, including expanding access to all sites in the genome and discovering small systems that are compatible with various delivery vehicles, such as AAV.

Scientist working in the lab

Our genetic editors differentiate from other editing approaches through our focus on four areas as seen below.

Arbor technology characteristics

From Discovery to Disease:

The Right Tool for Every Patient

Our four distinct editing technologies are each designed to match the specific biology of a disease, not the other way around. This gives us the flexibility to identify what each disease requires and apply the right tool to maximize therapeutic impact.

Knockdown+— For diseases driven by toxic protein overproduction

Some diseases are caused by a gene producing too much of a certain protein. Knockdown+ uses compact nucleases with precise large-deletion patterns to silence the target gene durably and effectively. Small enough to fit within a single AAV capsid, these editors are purpose-built for systemic delivery, including to the CNS.

Knockdown+ mechanism diagram

Precision (RT) Editing— For diseases requiring exact genetic correction

Some diseases are driven by a specific error in the DNA sequence, sometimes as small as a single base pair. Precision (RT) editing corrects the sequence at that exact location, without disturbing surrounding DNA. With broad PAM compatibility and no windowing limitations, this modality opens targets that other approaches cannot reach with the same fidelity.

Precision RT editing mechanism diagram

Nuclease Excision— For diseases driven by a genetic sequence that shouldn’t be there

When the disease driver is a sequence that needs to be removed entirely, such as cryptic splice sites or repeat expansion diseases, nuclease excision delivers. Our compact editors fit within a single AAV alongside multiple guide RNAs, enabling precise excision of disease-causing elements with one therapeutic.

Nuclease excision mechanism diagram

Large Insertions— For diseases requiring restoration of a missing or non-functional gene

Some diseases can only be addressed by adding or replacing genetic sequences. Our large insertion technology enables integration of functional gene sequences into endogenous loci, allowing more natural gene regulation and durable therapeutic effect. A single product can address patients with different underlying mutations.

Large insertions mechanism diagram

Publications & Presentations

. Molecular Therapy; 13 Apr 2026; Vol 34 (7)
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. Nature Reviews Microbiology; 2025;
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. Cytotherapy; 24 Jun 2025; Vol 0.
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. Communications Biology; 05 Jun 2025; Vol 8 (876)
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ASGCT Oral Presentation on ABO-101 (Mol Therapy); 13 May 2025; Vol 33 (4, S1): Abstract 44
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. The CRISPR Journal; 17 Apr 2025; Vol 8 (2)
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. Nature Communications; 20 May 2022; Vol 13 (2833)
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. Nature Reviews Microbiology; 2020; Vol 18: pp67-83
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. Nature Reviews Microbiology; 05 Jun 2019; Vol 17: pp513-525
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. Science; 6 Dec 2018; Vol 363 6422: pp88-91
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. Molecular Cell; 19 Apr 2018; Vol 70 (2) 99: pp327-339.E5
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