About 8% of our DNA may have come from ancient viruses that infiltrated our cells, where they established permanent residence.
Viral "Fossils" in Our DNAThe human genome includes 100,000 pieces of "ancient viral DNA." Recent studies of what function, if any, this "fossil" DNA might perform in our bodies suggest that it may play a vital role in boosting our immune systems. Amazingly, viruses that invade our cells sometimes not only become part of our chromosomes but become inheritable. The article summarizes the process thusly:
"When a type of virus known as a retrovirus infects a cell, it converts its RNA into DNA, which can then become part of a human chromosome. Once in a while, retroviruses infect sperm and egg cells and become 'endogenous,' meaning they are passed down from generation to generation."
In science-fiction treatments of traditional monsters such as vampires and werewolves, this ability of some retroviruses could be invoked to rationalize how a naturally evolved creature of a different species could convert a human victim—or willing host—into a member of the "monster" species.
When Walt Whitman declared, "I contain multitudes," he wrote truer than he could have suspected. That quote features in the title of a book by Ed Yong, I CONTAIN MULTITUDES: THE MICROBES WITHIN US AND A GRANDER VIEW OF LIFE, about microbiomes inside animals and especially humans, in the context of a vision of our bodies as "living islands" with millions of inhabitants.
On a totally different topic, but harking back to some of my earlier posts, here is a detailed article about the intelligence of octopuses, to which I've alluded more than once in the past. As the article says, they're probably the closest to intelligent aliens of any species we currently know. Cool!
Another Path to IntelligenceMargaret L. Carter
Carter's Crypt
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