700 year old virus isolated from the ice
Scientists have discovered a new virus. The DNA and RNA was
isolated from 700-year-old Caribou feces, found in a drilled ice core. Two
distinct viral genomes were isolated—one with a small circular DNA viral genome
(ancient caribou feces associated virus, or aCFV) and one with a partial RNA
viral genome (Ancient Northwest Territories cripavirus, or aNCV). The viral
capsids were protected for 700 years by the extreme cold. These viruses are
related to the geminivirus family (which infects plants). The viruses were no
longer alive, but researchers were able to use a modern geminivirus multimeric
clone to induce the DNA virus to infect Nicotiana Benthamiana in the lab. The researchers
think that the virus came from foliage eaten by the caribou or from flying insects
ingested at the same time as foliage.
It is very likely that as global temperature increase and
more permafrost melts, many more ancient viruses, not unlike these will be
exposed. Any number of viruses may be exposed and some of them may still be
infectious. When considered with the giant virus uncovered in Siberia a few
weeks ago, it may be wise to develop a stratagey to deal with these potentially
dangerous ancient pathogens.
Madeleine Bousquet
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1 comment:
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