Switch Therapeutics

Switch Therapeutics launches with $52M to capitalize on RNA medicine ‘era’​

Dive Brief:

  • With an aim to make more precise genetic medicines, Switch Therapeutics emerged from stealth Tuesday with $52 million in venture funding.
  • Switch is built on research into what it describes as “conditionally activated” small interfering RNA. The company claims it can design RNA molecules to be activated only in certain cells, potentially aiding their use in targeting central nervous system diseases.
  • Based in South San Francisco, Calif., the company is headed by Dee Datta, a former Xoma executive, and Si-ping Han, a scientist who developed the technology behind Switch’s platform while at California Institute of Technology and City of Hope, a Southern California cancer center.

Dive Insight:

Researchers and drugmakers spent decades chasing RNA interference as a method to “silence” harmful genes and thereby treat disease. But it took many years to refine the delivery of RNAi-based drugs.

One of the most well-known RNAi developers, Alnylam Pharmaceuticals, has found repeat success in delivering its medicines into the liver, winning U.S. approvals of four rare disease treatments.

Now, biotechnology startups are following in the footsteps of Alnylam and others like Ionis PharmaceuticalsArrowhead Pharmaceuticals and Dicerna Pharmaceuticals, which also develop different flavors of RNA-based drugs. Increasingly, drugmakers are looking at diseases outside the liver, such as those affecting the brain and spinal cord, believing the technology could help change how nervous system disorders are treated. Alnylam, for instance, is expecting to soon have early study data on an experimental RNAi treatment for Alzheimer’s disease.

Switch plans to develop small interfering RNA structures that could attach to a sensor and target specific cells. The company is named for its goal of developing cell-specific drugs.

“We’ve invented a way to put a simple and compact sensor on each siRNA molecule in the cells,” Datta said. “When the sensor actually detects an RNA biomarker, it will switch on the drug activity.”

Switch claims its technology can develop molecules that would deliver medicines efficiently into a cell while maintaining longer-lasting “knock down” of a target gene.

Datta declined to share which CNS diseases Switch is pursuing. The company is also exploring possible partnerships with other pharmaceutical firms.

“We are very well-positioned to build on progress that has been made in the field to create the next generation of RNAi medicine,” Datta said.

Its investor syndicate was led by Insight Partners and UCB Ventures, with participation from Eli Lilly, Upfront Ventures and Ono Venture Investment, among others. 


Switch Therapeutics is an emerging biotechnology company pioneering a new type of medicine that integrates nucleic acid nanotechnology and RNA interference (RNAi) science, with the goal of treating a range of diseases – affecting the central nervous system and systemic indications – with significant unmet need. The CASi (Conditionally Activated siRNA) platform, the company’s novel gene knockdown approach, is based on technology developed by renowned researchers in the field of RNA and drug development from Caltech, Harvard Medical School and City of Hope. CASi combines advantageous properties of both single and double-stranded RNAs in a single molecule, allowing for cell selective RNAi activity. Switch is based in South San Francisco, California. For more information, connect with Switch on LinkedIn or visit www.switchthera.com.


Media Contact:
Tressa Frankel, Health+Commerce

Investor Contact:
Hannah Deresiewicz, Stern Investor Relations, Inc.