Scientists at the University of Florida have developed the world's first CRISPR system that uses DNA rather than RNA as a guide. CRISPR is a technology that scientists use to find and cut or control specific genetic material inside cells. In standard systems, RNA molecules serve as guides to locate targets. RNA is a temporary copy of genetic instructions made from DNA.
DNA is the molecule that carries the cell's permanent genetic instructions. The new system engineers CRISPR enzymes to use DNA guides to find and act on specific RNA molecules. This approach overturns the long-standing practice of using RNA guides.
DNA guides are naturally more stable than RNA guides. They are also cheaper and easier to manufacture. RNA molecules break down quickly, while DNA remains intact much longer.
Improved precision and lower costs
The new DNA-guided system greatly reduces unintended effects on other molecules compared with existing RNA-targeting approaches. In some cases, it improves precision by orders of magnitude. This higher accuracy could make gene-editing tools safer for medical use. By targeting RNA, scientists can influence how cells use their genetic instructions without making permanent changes to the DNA itself. This gives more temporary and reversible control over disease processes such as uncontrolled cell growth in cancer.
The technology also has strong potential for diagnostics. Early tests showed it can detect viruses such as HIV and identify hepatitis C with complete accuracy. Lower production costs and greater stability could make CRISPR-based tests and treatments more affordable and accessible. Researchers see additional uses in areas such as repairing organs for transplantation outside the body.
The study is published in Nature Biotechnology. In a related effort, collaborators at the University of Texas at Austin released the detailed structure of this DNA-guided system in a preprint earlier this year. The breakthrough opens new possibilities for precise disease control and represents a fundamental shift in how scientists apply CRISPR technology.