Novel Gene Switch Tool Developed for Safe and Precise Control of Gene Activity

Scientists at Weill Cornell Medicine have developed a versatile and non-toxic gene-switch technology called Cyclone, enabling researchers to precisely control the activity of any gene in a cell. This innovative tool allows genes to be turned on or off, facilitating studies of gene function, disease modeling, and the design of new therapies. Unlike older methods that use potentially toxic drugs, Cyclone employs the antiviral drug acyclovir, which is widely used and has a well-established safety profile. 

Cyclone is inspired by a natural genetic mechanism involving “poison exons,” DNA segments that can block gene translation under specific conditions. The researchers engineered a poison exon that can be inserted into any target gene to suppress its activity. When the gene’s activation is desired, administration of acyclovir binds to the poison exon system, lifting the suppression and restoring gene expression. This process preserves RNA transcripts and protein integrity, addressing limitations of previous gene-switch tools that often altered RNA.

The technology allows gene regulation to be finely tuned from nearly zero expression to over 300% of normal levels, depending on the dose of acyclovir. It works with both natural genes and artificial constructs and has the potential to control multiple genes independently using different switch molecules. The safety and reversibility of this approach position it as a promising platform for gene therapy, offering a safety switch to modulate therapeutic gene activity after administration.

“We think the Cyclone concept has great potential for diverse applications requiring the safe and precise control of gene activity,” said Samie Jaffrey, the senior author of the study published in Nature Methods.