Traces of ancient viruses which infected our ancestors millions of years ago are more widespread in us than previously thought. A study shows how extensively viruses from as far back as the dinosaur era still thrive in our genetic material. It sheds light on the origins of a big proportion of our genetic material, much of which is still not understood. The scientists investigated the genomes of 38 mammals including humans, mice, rats, elephants and dolphins. ... One of the viruses was found to have invaded the genome of a common ancestor around 100 million years ago with its remnants discovered in almost every mammal in the study. Another infected an early primate with the result that it was found in apes, humans and other primates as well. The work established that many of these viruses lost the ability to transfer from one cell to another.
virus dinosaur ancient cell genome human animal genetics