How Epic Bio is leveraging CRISPR without cutting DNA
Episode
33 min
Read time
2 min
Topics
Startups, Software Development, Science & Discovery
AI-Generated Summary
Key Takeaways
- ✓Mutation-agnostic targeting: Epigenetic editing can treat diseases with hundreds of distinct mutations in a single gene — like cystic fibrosis, which has over 2,000 mutations — using one therapeutic modality. Rather than developing separate drugs per mutation variant, a single epigenetic silencing or activation approach targets a common genomic region, bypassing the commercial and clinical feasibility barriers of ultra-rare mutation subgroups.
- ✓Reversibility as a safety mechanism: Unlike permanent DNA sequence edits, epigenetic modifications can be written and erased because natural cellular machinery includes both writer and eraser enzymes for marks like methylation. This built-in reversibility reduces the risk of irreversible off-target edits — a key safety advantage over standard CRISPR gene editing in clinical settings where remediation options are limited.
- ✓Miniaturized Cas protein enables single-vector delivery: EpicBio's proprietary CasMini protein is one-third the size of Cas9, small enough to fit an entire GEMS therapeutic — guide RNA plus epigenetic enzyme fusion — into a single AAV vector. This single-vector delivery is critical for in vivo gene therapy, where payload size constraints have historically limited what can be packaged and delivered efficiently.
- ✓FSHD as a proof-of-concept disease: EPI-321 targets FSHD by re-silencing the DUX4 gene via DNA methylation installation at its promoter region. FSHD is caused by inappropriate DUX4 expression across multiple gene copies — a structure resistant to standard gene editing — making it a strategically selected first indication to validate both epigenetic silencing efficacy and safety in human Phase 1 trials.
- ✓Pipeline diversification across delivery modalities: Beyond AAV-delivered muscle and retinal programs, EpicBio encodes epigenetic editing molecules in mRNA packaged in lipid nanoparticles for liver disease indications — the same LNP delivery platform used in approved vaccines. This dual-modality approach (AAV for post-mitotic tissues, LNP for liver) expands addressable disease categories without requiring entirely new delivery infrastructure.
What It Covers
Stanford bioengineering professor Stanley Qi, founder of EpicBio, explains how the company's GEMS platform uses a miniaturized Cas protein — one-third the size of Cas9 — to perform reversible epigenetic editing without cutting DNA, with lead program EPI-321 targeting FSHD muscular dystrophy in an upcoming Phase 1 trial.
Key Questions Answered
- •Mutation-agnostic targeting: Epigenetic editing can treat diseases with hundreds of distinct mutations in a single gene — like cystic fibrosis, which has over 2,000 mutations — using one therapeutic modality. Rather than developing separate drugs per mutation variant, a single epigenetic silencing or activation approach targets a common genomic region, bypassing the commercial and clinical feasibility barriers of ultra-rare mutation subgroups.
- •Reversibility as a safety mechanism: Unlike permanent DNA sequence edits, epigenetic modifications can be written and erased because natural cellular machinery includes both writer and eraser enzymes for marks like methylation. This built-in reversibility reduces the risk of irreversible off-target edits — a key safety advantage over standard CRISPR gene editing in clinical settings where remediation options are limited.
- •Miniaturized Cas protein enables single-vector delivery: EpicBio's proprietary CasMini protein is one-third the size of Cas9, small enough to fit an entire GEMS therapeutic — guide RNA plus epigenetic enzyme fusion — into a single AAV vector. This single-vector delivery is critical for in vivo gene therapy, where payload size constraints have historically limited what can be packaged and delivered efficiently.
- •FSHD as a proof-of-concept disease: EPI-321 targets FSHD by re-silencing the DUX4 gene via DNA methylation installation at its promoter region. FSHD is caused by inappropriate DUX4 expression across multiple gene copies — a structure resistant to standard gene editing — making it a strategically selected first indication to validate both epigenetic silencing efficacy and safety in human Phase 1 trials.
- •Pipeline diversification across delivery modalities: Beyond AAV-delivered muscle and retinal programs, EpicBio encodes epigenetic editing molecules in mRNA packaged in lipid nanoparticles for liver disease indications — the same LNP delivery platform used in approved vaccines. This dual-modality approach (AAV for post-mitotic tissues, LNP for liver) expands addressable disease categories without requiring entirely new delivery infrastructure.
Notable Moment
Qi points out that over 40% of diseases involve genetic or epigenetic changes, and with more than 8,000 rare genetic diseases collectively affecting 6% of the global population, current gene editing addresses only a narrow slice — framing epigenetic editing as a necessary expansion, not merely an alternative approach.
Episode Transcript
Hello. And welcome to Beyond Biotech, the weekly podcast from Labiatek. I'm Dylan Kossain, and this is episode 195 for the podcast. This week, we dive into the Beyond Biotech archive to bring you a discussion with doctor Stanley Chee, the founder of EpicBio. EpicBio is an epigenetic editing company leveraging the power of CRISPR without cutting DNA. The company's proprietary gene expression modulation system, GEMS, includes the smallest Cas protein known to work in human cells, enabling in vivo or ex vivo delivery via a single viral vector. In this episode, we discuss epigenetic editing, why it's reversible, and how it can treat FSHD and other conditions. We'll be back with a new episode next week. But in the meantime, please enjoy this discussion with Stanley Chee. Our episode today is brought to you with the support of MedChem Express or MCE, a global leader in life science reagents. MCE provides end to end support for biopharmaceutical innovation, specifically empowering gene therapy through high purity oligonucleotide synthesis, including ASOs and c RNAs and GMP lipids that enhance delivery efficiency. With more than a 100,000 inhibitors and rigorous cGMP inspected quality, MCE is the ultimate partner for cutting edge drug discovery and clinical breakthroughs. Learn more about MCE at medchemexpress.com. You've had a very interesting career to this date. So I wonder if maybe to start, you could tell me a little bit about some of the things that you've done so far in the biotech field. Yeah. Sure. I'm currently, associate professor of bioengineering at Stanford University. And my primary research direction is to get better technologies and tools that we could use to, modify and control the human genome beyond gene editing. And besides using these tools for research, we have a big goal to translate some of these tools into the therapeutic domain, such as new gene therapy or cell therapy for disease that really demands a new technology. For my training background, I originally got my PhD from UC Berkeley in bioengineering. However, even before that I was trained as a physicist and, I have been working on synthetic biology and biofuel production and methods on that for a couple years before I transitioned my attention fully onto tackling the technologies and the treatments for the human disease. And after my PhD at Berkeley, I also worked for a few years at UCSF to as an independent fellow and there we co develop technologies like Nucleus DAT, dCas9 and CRISPR I, CRISPR A. And then after we move I moved my lab to Stanford, we've been very much focused on thinking how we could use these technologies to treat disease. And then we have particular focus on the human epigenome, such as the epigenetic editing. Is that what led to the formation of EpicBio? Oh, yes. So we've been working in this domain for more than decade, and, it all started with the need, the huge need that the question is, how can we precisely modify …
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