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Unexpected Inheritance: Multiple Integrations of Ancient Bornavirus and Ebolavirus/Marburgvirus Sequences in Vertebrate Genomes
….In 19 of the tested vertebrate species, we discovered as many as 80 high-confidence examples of genomic DNA sequences that appear to be derived, as long ago as 40 million years, from ancestral members of 4 currently circulating virus families with single strand RNA genomes. Surprisingly, almost all of the sequences are related to only two families in the Order Mononegavirales: the Bornaviruses and the Filoviruses, which cause lethal neurological disease and hemorrhagic fevers, respectively. ….The conservation of relatively long open reading frames for several of the endogenous sequences, the virus-like protein regions represented, and a potential correlation between their presence and a species' resistance to the diseases caused by these pathogens, are consistent with the notion that their products provide some important biological advantage to the species. ….the examples described here should be considered a low estimate of the number of such integration events that have persisted over evolutionary time scales. Clearly, the sources of genetic information in vertebrate genomes are much more diverse than previously suspected.
…..a separately derived primate lineage (comprising marmosets, macaques, chimps, and humans) contains endogenous BDV gene N-related sequences integrated into seven different places in the genomes. …..In the primate line these sites first appear in the present day marmosets and have been retained over forty million years from a common ancestor of marmosets and humans (Figure 2). ……several integrations show signs of strong positive selection, namely those related to the BDV N gene in humans, microbats, rodents, and other animals, and both the EBOV/MARV NP and VP35 gene-related integrations in bats and tarsier. Some integration events, including the BDV N-like sequences in humans (e.g. hsEBLN-1) and the EBOV VP35-like sequences in microbats (mlEEL35) have maintained nearly full-length open reading frames (Table 2). The probability of having no stop codon in the longest of these, the BDV gene N-like integration in humans, is one in eight hundred, suggesting that at some time, past or present, there was strong selective pressure to keep and express this ancestral viral gene.
…suggesting that at some time, past or present, there was strong selective pressure to keep and express this ancestral viral gene.
…DNA sequences that appear to be derived, as long ago as 40 million years, from ancestral members of 4 currently circulating virus families…
So would this mean that if we were to immunize against Ebola or create something to help us fight it that we would be causing our immune system to target our own DNA material?
Paleogenetics shows that we are a kind of amalgam of bacteria and viruses - more the foundation of how we were "built" and evolved - a mix that occurred long before we were complex organisms. This is one of those.
Yes, Ebola has mutated since - in terms of evolution and epigenetic response to the environment, we need to integrate new mutations - it's a mechanism that helps us adapt to our changed environment [Alert: controversial idea].
The "Guinea" outbreak looks like several, spread over hundreds and hundreds of miles - suspected cases have been reported in several areas and other countries including Liberia, Sierra Leone, Gambia and Mali.
You sound informed about it. Got any links?
Not new or controversial.
I mean we need to be infected to stay in harmony with our environment - infections being the mechanism of adaptation.
IamAbeliever
This reminds me of Season 1 of The Walking Dead when they all arrived at the CDC and found out that everyone already has the "virus" within them.
...prions disease- like in "mad cow" disease- caused by cannibalsm
A mutation of an ebola virus that allowed for a mild flu like phase could easily account for inclusion into our genetic makeup.
soficrow
reply to post by bigfatfurrytexan
A mutation of an ebola virus that allowed for a mild flu like phase could easily account for inclusion into our genetic makeup.
40 million years ago suggests the inclusion occurred just after complex organisms started developing, and before our species emerged. Just part of our supraorganism make-up.
Elliot
That supposedly being the case, why no Ebola outbreaks before 1976 and why only in Africa?