South Korean researchers build gene switch controlled by electromagnetic fields

Researchers at Dongguk University in Seoul have created a gene switch that can be turned on and off inside living animals using electromagnetic fields, a development that could reshape how gene therapies are delivered. The study, published in Cell on May 28, 2026, describes a system that responds to external electromagnetic stimulation, allowing remote, non-invasive, and reversible control over gene expression.pubmed.ncbi.nlm.nih+1

How the Switch Works

The team, led by Professor Jongpil Kim and doctoral student Yerim Hwang from the Institute for Stem Cells and Regenerative Medicine, began by exposing mouse brain tissue to an electromagnetic field of 2.0 millitesla at 60 hertz — the same frequency as standard household alternating current. Using single-cell RNA sequencing, they identified a gene called Lgr4 whose activity increased in response to the field. The regulatory promoter region of Lgr4 became the foundation for what the researchers call the electromagnetic-field-inducible, or Ei, gene switch.bioengineer+2

In transgenic mice engineered to carry the switch linked to a green fluorescent protein reporter, EMF exposure produced visible gene activation throughout the body. Targeted stimulation activated genes in specific organs, and once the field was switched off, gene expression returned to baseline within 24 hours. A genome-wide CRISPR-Cas9 screen identified the protein cytochrome b5 type B, or Cyb5b, as a likely molecular sensor for electromagnetic fields. "This may be the first reported molecular sensor for electromagnetic fields," Professor Kim said in comments released by the university.miragenews+2

Preclinical Applications

The researchers demonstrated several uses for the switch in mice. They built an Alzheimer's disease model that separates brain aging from amyloid-beta plaque buildup, used cyclic EMF exposure to achieve partial cellular reprogramming in aged mice, and restored serotonin levels by controlling the Tph2 gene to reduce depression-like behaviors. No adverse effects were detected during the experiments, though the team acknowledged that longer-term safety studies and testing in larger animals are needed before any clinical application.miragenews+1

A Shift in Gene Therapy

"This technology could move gene therapy away from a single, irreversible dose and toward simpler, real-time treatments administered by physicians or even wearable devices," said Hwang in a press release distributed on August 17. The findings remain preclinical, and questions about tissue specificity, immune responses, dose control, and long-term safety in humans are unresolved. Still, the Ei system introduces a mechanism — rhythmic calcium oscillations rather than a simple calcium increase — that the researchers describe as a precisely tuned biological code for gene activation.prnewswire+2