Ancient Viral DNA Acts as Genetic Switches, Reshaping Understanding of Human Evolution

For generations, scientists dismissed nearly half the human genome as the silent residue of ancient viral invasions — evolutionary noise with nothing left to say. A new international study now reveals that this so-called junk DNA has, over millions of years, been quietly repurposed into genetic switches that govern which genes awaken during the earliest moments of human development. The discovery invites a humbling reconsideration: what we label as waste may simply be a language we have not yet learned to read.