Reimagining DNA Payloads; Enzymatic Circular DNA For The Next Generation Of Gene Editing

By Mitchell Brun, Ph.D. Lisa Caproni, Ph.D., and Milica Vukovic, Ph.D MBA.

This piece explores how innovative circular DNA architectures are reshaping gene editing by providing more efficient, flexible, and safer payload options for a wide range of insertion technologies. As therapeutic programs evolve beyond simple edits toward large and complex gene insertions, traditional templates—whether viral or linear DNA—struggle with cytotoxicity, payload limitations, and manufacturing constraints. Newly developed circular DNA formats, incorporating customizable single‑stranded and double‑stranded regions, address these challenges by improving stability, reducing innate immune activation, and enabling high‑efficiency integration. These architectures support diverse mechanisms including homology‑directed repair, recombination, transposition, and hybrid CRISPR‑based systems. Their design helps maintain cell viability, minimise inflammatory signaling, and accommodate multi‑kilobase sequences required for next‑generation therapies. Scalable enzymatic manufacturing allows rapid production of high‑purity templates without fermentation‑derived contaminants, enabling smooth progression from research through GMP‑ready applications. Collectively, these advancements redefine payload engineering and pave the way for safer, more adaptable non‑viral gene editing strategies.