Using Yeast Cell Walls to Deliver Genetic Medicine

A method for using hollowed-out yeast cell walls as tiny transport containers to deliver genetic payloads like DNA or RNA into cells.

What it covers

This patent describes a biological delivery system that uses the empty shell of a yeast cell as a protective vessel. To keep a genetic payload—like siRNA or DNA—inside this shell, the inventors add a cationic (positively charged) trapping molecule. Because genetic material is typically negatively charged, the positive 'trapping' molecule acts like a magnet, holding the medicine securely inside the yeast shell until it reaches its target. This allows the system to carry delicate therapeutic molecules through the body without them breaking down prematurely.

What it doesn't cover

• —Does not cover delivery systems that use synthetic or non-yeast-based shells.
• —Does not cover systems that lack a cationic trapping molecule to secure the payload.
• —Does not cover the use of yeast cell walls that contain more than 90 weight percent beta-glucan.
• —Does not cover payloads that are not nucleic acids, such as small molecule drugs or proteins, unless they are specifically part of a nucleic acid construct.

The clever bit

The invention uses the natural, porous structure of a yeast cell wall as a physical cage, combined with electrostatic attraction (positive trapping molecule to negative DNA/RNA) to prevent the payload from leaking out.

Why it matters

Delivering genetic medicine is notoriously difficult because the body often destroys DNA or RNA before it reaches the target. By repurposing natural yeast cell walls, this technology provides a biodegradable and potentially non-toxic way to package these sensitive therapies, which is a major hurdle in gene therapy and vaccine development.

Real-world examples

• 1.Targeted gene therapy research
• 2.Oral delivery of RNA-based therapeutics
• 3.Vaccine delivery platforms