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Ancient viruses that affected our ancestors 30 mn years ago found
A team of US researchers has revealed the global spread of an ancient group of retroviruses that affected about 28 of 50 modern mammals\' ancestors some 15 to 30 million years ago. Retroviruses are abundant in nature and include human immunodeficiency viruses (HIV-1 and -2) and human T-cell leukemia viruses.
New York: A team of US researchers has revealed the global spread of an ancient group of retroviruses that affected about 28 of 50 modern mammals' ancestors some 15 to 30 million years ago. Retroviruses are abundant in nature and include human immunodeficiency viruses (HIV-1 and -2) and human T-cell leukemia viruses.
The findings on a specific group of these viruses called ERV-Fc show that they affected a wide range of hosts, including species as diverse as carnivores, rodents and primates. The distribution of ERV-Fc among these ancient mammals suggests the viruses spread to every continent except Antarctica and Australia, and that they jumped from one species to another more than 20 times, said the team from Boston College, US.
The study also places the origins of ERV-Fc at least as far back as the beginning of the Oligocene epoch, a period of dramatic global change marked partly by climatic cooling that led to the Ice Ages. Vast expanses of grasslands emerged around this time, along with large mammals as the world's predominate fauna.
