Ditto Biosciences

Ditto Biosciences

Evolutionary therapies for autoimmune disease

Winter 2026ActiveHealthcareDrug Discovery and DeliveryBiotechTherapeuticsDrug discoverySan Francisco, CA, USA
Ditto Bio discovers drugs for autoimmune diseases by harnessing parasite biology. Viruses, ticks, and worms have experimented over millions of years to create proteins that control the human immune system. We use AI to identify these proteins and engineer them into next-generation autoimmune therapies.

Verdict

High Signal
Market Opportunity
Autoimmune disease is a $150B+ global market with massive unmet need — conditions like RA, lupus, IBD, MS affect hundreds of millions. The approach targets first-in-class biologics, which command premium pricing and partnership interest from large pharma. ICP is pharma/biotech licensing deals or building pipeline to clinical stage.
High Signal
Founder Signal
Exceptionally strong scientific team. Adair Borges holds a UCSF PhD, was a Miller Fellow at UC Berkeley, published 50+ papers, co-invented anti-CRISPR patents, and led Arcadia Science's therapeutic venture creation team (Dec 2023-May 2025). Dennis Sun has a Harvard/UC Berkeley PhD, served as Chief of Staff and PM at Arcadia Science (2022-2025) bridging science and ops. Emily Weiss holds a UCSD PhD in microbiology, has Illumina and DuPont experience, and published in Nature Microbiology and eLife. All three spent years at Arcadia Science specifically working on parasite-derived therapeutics — this is a direct spinout of deep domain expertise.
Medium Signal
Competition
No direct competitors identified in research data. The parasite-derived immunomodulatory approach is novel — companies like Hookworm Capital/helminth therapy startups are tangentially related but different modality. Broad autoimmune biotech space is crowded (AbbVie, Pfizer, Regeneron, numerous biotechs) but Ditto's evolutionary/parasite biology angle is differentiated. The AI-driven structural mimicry pipeline appears proprietary based on published Arcadia Science work.
Low Signal
Product
No drug candidates disclosed, no pipeline data, no partnerships, no preclinical results shared publicly. Website is essentially a science education showcase about nature-derived drugs — no product evidence, no customers, no revenue possible at this stage. Pure early-stage biotech with a 'Contact us' CTA.
OverallB Tier

Ditto Bio has arguably one of the strongest scientific founding teams in the W26 batch — three PhDs with directly relevant expertise in parasite biology, genomics, and computational biology, all of whom worked together at Arcadia Science building exactly this thesis. The science is genuinely novel and defensible. However, this is pre-product, pre-candidate, pre-revenue biotech at the earliest possible stage; the YC model fits awkwardly here as drug discovery requires 7-10 years and $100M+ to reach meaningful milestones. The key risk is not the science or the team — it's whether YC-style velocity and capital structure can work for a company that needs IND filings, not software launches. Worth watching closely if they secure a pharma partnership or name a lead candidate.

Active Founders

Adair Borges
Adair Borges
Founder

Entrepreneurial scientist using evolution to build the next generation of therapeutics for autoimmune disease. UCSF-trained PhD with expertise spanning parasitology, virology, and genomics. Published over 50 scientific papers, and is a coinventor on a patent for anti-CRISPR proteins. Former Miller Fellow at UC Berkeley, and previously led a venture creation team at an early stage biotech company. Motivated by a lifelong fascination with parasites.

Dennis Sun
Dennis Sun
Founder

Scientist and operator transforming natural proteins into therapies. Trained in evolutionary and developmental biology at Harvard and UC Berkeley, and previously led product development and scientific partnerships as Chief of Staff at an early-stage biotech. Now engineering proteins from viruses, ticks, and worms into first-in-class drugs for autoimmune disease.

Emily Weiss
Emily Weiss
Founder

I'm a molecular and computational biologist working to revolutionize drug discovery for autoimmune disease. At Ditto, I lead the platform for engineering parasite-derived therapeutics. I hold a PhD in microbiology, genomics, and plant genetics, with a focus on sequencing, high-throughput screening, and computational pipeline development. Published in Nature Microbiology and eLife. Previously at Illumina, DuPont, and an early-stage biotech venture team.

Ditto Biosciences
Ditto Biosciences
TierB Tier
BatchWinter 2026
Team Size3
StatusActive
LocationSan Francisco, CA, USA