Genetic medicine startup Tune Therapeutics has raised another $175 million to develop therapies capable of tuning genes to treat disease, rather than editing them by cutting or replacing DNA directly.Tune disclosed the Series B round on Sunday, the eve of the J.P. Morgan Healthcare Conference, which regularly features as a curtain-raising meeting for the biotechnology and pharmaceutical sectors. It follows a busy week for private financing in biotech, adding to nearly $2 billion worth of investment announced by venture firms tracked by BioPharma Dive since Monday.Tunes lead therapy, dubbed Tune-401, is designed to treat chronic hepatitis B by silencing the viral DNA thats both integrated into an infected cells genome and circulating in loops within the cell. More than 250 million people worldwide are estimated to have chronic hepatitis B infections, which can cause liver failure and cancer. Researchers see altering gene expression via epigenetic editing as a way to block cells from producing more of the virus, rather than fighting the virus directly, as existing drugs do.Its thinking about addressing a leak by trying to shut off the faucet, said Akira Matsuno, one of Tunes co-founders and now its chief financial officer. Many therapies ... either try to slow down the pace or are really good at getting the water out of the tub, if you will. But ultimately, you have to be able to shut off the faucet.The company has begun a Phase 1 trial of Tune-401 in New Zealand and Hong Kong.Scientists have described epigenetic editing as more efficient and less disruptive than DNA-cutting technologies like CRISPR, proposing that it could also be used to turn genes on or off.We have these targeted, really specific therapies that do not confer DNA damage, Matsuno said. It opens up a lens with regards to the types of opportunities and settings we can go into over time.Tunes science builds on research by genetic medicine pioneers Charles Gersbach at Duke University and Fyodor Urnov at the University of California, Berkeley.The companys Series B round was co-led by New Enterprise Associates, Yosemite, Regeneron Ventures and Hevolution Foundation. When Tune launched in 2021, it raised a $40 million Series A.Chronic diseases of aging are accelerating in incidence, prevalence, and severity, and current approaches are simply inadequate, William Greene, chief investment officer at Hevolution Foundation, said in a statement. It is our belief that epigenetic editing may prove to be the transformative modality we need to enable a new era of regenerative medicine.Tune is one of several companies working to advance epigenetic editing as a drugmaking technology. Among its competitors in the field is nChroma Bio, which formed late last year from a merger between Chroma Bio and Nvelop Therapeutics. NChroma is also researching a potential treatment for hepatitis B, but has not entered human testing. Epicrispr Therapeutics, formerly known as Epic Bio, is researching treatments for several conditions including a form of muscular dystrophy and alpha-1 antitrypsin deficiency.Beyond epigenetic editing specifically, startups working in genetic medicine are seeing less investment flow into their field. Funding of cell and gene therapy developers declined in 2024 compared to the two years prior, according to BioPharma Dive data. '