As if climate change didn't already suck enough, right?
M. sibericum has more than 500 genes, compared to just 9 in HIV. One of the previously discovered giant viruses, Pandoravirus, has a staggering 2,500 genes. Scientists are still figuring out what that means for a virus, and what it says about the way viruses evolved — and how we should deal with them. (You can hear all about these weirdly large viruses in this recent episode of Radiolab.)
If scientists can confirm that humans and animals won't be susceptible to sibericum, they're going to go ahead and wake it up so they can study it. But they're proceeding with caution. These viruses may be ancient, but they've also been kept in nature's own deep freezer. They want to be sure they're not reviving anything potentially harmful.
"A few viral particles that are still infectious may be enough, in the presence of a vulnerable host, to revive potentially pathogenic viruses," lead researcher Jean-Michel Claverie of France's National Centre for Scientific Research told the AFP.
But careful scientists may not be enough to save us from ancient microbes. Claverie and his colleagues worry that these viruses, which now seem to be fairly common in permafrost, could be released on their own by way of melting ice or human activity — oil drilling, for example.
"We cannot rule out that distant viruses of ancient Siberian human (or animal) populations could reemerge as arctic permafrost layers melt and/or are disrupted by industrial activities," the paper states.
That may be a bit of a leap. Other scientists have pointed out that this would require some really bad luck on humanity's part, and that we should probably focus on the more immediate effects of climate change. Fingers crossed that we keep finding giant viruses that advance scientific study without stumbling upon anything deadly.