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Giant viruses may play an intriguing role in evolution of life on Earth February 7, by Richard C.
Lewis, University of Iowa Credit: CC0 Public Domain We all know viruses cause colds and flu this time of year, but you might be surprised to learn that a virus may have played a key role in the evolution of nearly all life forms on Earth.
In a new study, a University of Iowa biologist identified a virus family whose set of genes is similar to that of eukaryotes, an organism classification that includes all plants and animals.
The finding is important because it helps clarify how eukaryotes evolved after branching from prokaryotes some 2 billion years ago. Viruses like Marseilleviridae may have been the source. An alternative and equally fascinating explanation is that an ancestor of the Marseilleviridae picked up this gene from a proto-eukaryotic organism, an intermediate between prokaryotes and eukaryotes.
Erives discovered this possible origin somewhat fortuitously.
For a class assignment, he asked students to investigate giant viruses. These super-sized viruses, first discovered in although believed to be in existence for billions of years, are the giants of the virus world: The one family of giant viruses not chosen by a student was Marseilleviridae, so Erives decided to take a look at it himself.
Unlike eukaryotes, however, these Marseilleviridae core histones are primitively fused as dimer proteins. The discovery begs a larger question about the role giant viruses have played in the evolution of all life on Earth.
Erives likens giant viruses to vines spreading out into the cellular tree of life—sampling here, borrowing there, and sharing genetic material among the branches of archaea, bacteria, and eukaryotes.
Why not use them now to peer into the past?The Texarkana Gazette is the premier source for local news and sports in Texarkana and the surrounding Arklatex areas.
A new position of dean of students and assistant provost for academic standards and student conduct is being created at Michigan State University. Pending Board of Trustees approval on Oct. 26, Philip Strong, current associate dean for students and instruction in the Lyman Briggs College, will serve.
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We all know viruses cause colds and flu this time of year, but you might be surprised to learn that a virus may have played a key role in the evolution of nearly all life .