On what day did EVE create the insects?

Its not so hard to get your head around endogenous retroviruses once you get the gist of them. RNA virus turns itself into DNA, inserts itself into your genome, makes babby viruses. Sometimes the RNA virus infects an egg/sperm, turns itself into DNA, inserts itself into the genome, and that egg/sperm goes on to create an organism that has the retrovirus permanently integrated into every cell of said organism.

Other endogenous viruses are a little harder to 'get'-- there are endogenous RNA viruses. How the hell did they get there? RNA viruses have no DNA step in their lifecycle, and yet, there they are.

There are endogenous DNA viruses too.

Pretty much any permutation of virus you can think of has an endogenous counterpart.

But, generally, the viruses we find in an organisms genome are the kinds of viruses that infect that organism. We dont find insect viruses in people or people viruses in plants or plant viruses in insects...

Endogenous RNA viruses of plants in insect genomes.

Wait, wat?

Because many plant viruses are transmitted by insect vectors - although often without active replication - it is also theoretically possible that plant viruses may also be integrated into insect genomes, and vice versa.

I love this! "Are there any plant viruses in insect DNA?" Its a weird, interesting question, but I wouldnt have really bothered investigating it. Like they said, its theoretically maybe possible, but it seems like the event would be so rare and so off the wall, it would hardly seem worth the effort to seriously investigate it.

I should take my own advice: "When youre dealing with a 4.2 billion year time-frame, random, low probability accidents happen all the time." There are endogenous viral elements, or EVEs, from plant viruses in the genomes of a multitude of insects:

This BLAST protocol revealed that the genomes of mosquito (Aedes aegypti), fruit flies (Drosophila rhopaloa, D. ananassae, and D. ficusphila), bees (Bombus terrestris, B. impatiens, and Megachile rotundata), ant (Pogonomyrmex barbatus), silkworm (Bombyx mori), pea aphid (Acyrthosiphon pisum), Monarch butterfly (Danaus plexippus), and wasps (Nasonia vitripennis, N. longicornis, and N. giraulti) contain EVEs that exhibit the closest relationship to plant viruses (protein sequence similarities of 50%-22%; e-values 0.81-2eâ 39; Table S1)

And even better-- This group of scientists doesnt overstate what they found (plant viruses in insects... OMG GMO GENES FROM CORN IN MOSQUITOES GIVING KIDS AUTISM!!!!). They point out a good alternative explanation in their discussion: There is still the possibility that while the EVEs in these insects *look* like they are related to plant viruses, they might actually belong to a family of not-yet-characterized insect viruses. We generally only find viruses we are looking for, and we only look for the ones that make us/our crops/our livestock sick. Good on this group of scientists for looking outside the box and finding something cool, whether they ultimately end up finding plant viruses in insects, or a new family of viruses in insects :)


More like this

ARR! I mean, ERV! I mean, NIRV! Phylogeny, integration and expression of sigma virus-like genes in Drosophila As my blag tagline goes, 'If we are made in Gods image, God is made of gag, pol, and env', the components of retroviruses.  Our, and other organisms, genome is inhabited by lots of bits of…
Quick recap of ERVs for new readers of ERV (or long-time readers who have forgotten!)-- ERVs are retroviruses that accidentally infected an egg/sperm cell, and became a permanent part of that egg/sperms DNA. That egg/sperm then went on to successfully generate a viable embryo, and because that…
Hepatitis B is my favorite non-retrovirus. Why? Because its a retrovirus :-D Heres another reason for me to love it-- Its viral family, Hepadnaviridae, inserted themselves into bird genomes 19 million years ago.Genomic Fossils Calibrate the Long-Term Evolution of Hepadnaviruses *happy-prospector-…
Carl Zimmer has a terrific blog post on the subject of endogenous retroviruses (ERVs) that should be mandatory reading for anyone who still denies common descent. ERVs are viruses that get inserted into the genomes of other organisms and are inherited by the descendants of that organism. He writes…


By Michael S (not verified) on 05 Apr 2012 #permalink

OK. And once again, the universe gets even stranger (possibly).

Ain't science fun!!!

OMG, Is it still safe to eat vegetables?