Do you care if human pregnancy evolved because of a virus?

 

If someone were to tell you that roughly 100 million years ago, our ancestors were infected by parasitic DNA, which copied and pasted itself throughout their genomes—and that this was linked to the evolution of modern human pregnancy –

what would you think?

how would you react?

 

 This is originally from October 2, 2011.  Updates are in rust colored italics.

 I had a hard time with this title. It was going to be something like:
Scientists may know why our babies advance so much in the womb.

or maybe:
Did Human Pregnancy Evolve Because of an Infection?

Eventually, I went with Who cares about religion?

That was three years ago.  Now, obviously, I changed it and went for Do you care if human pregnancy evolved because of a virus?  I think it’s more representative of the topic.  It also gets to the heart of the matter of choice.  Do you want to just accept what it says – that human pregnancy evolved (as opposed to us being created this way) and that this evolution was caused by a virus?

The first two choices were the subtitle and title for an article in Slate yesterday.

It starts off with –

If someone were to tell you that roughly 100 million years ago, our ancestors were infected by parasitic DNA, which copied and pasted itself throughout their genomes—and that this was linked to the evolution of modern human pregnancy—you might assume they were channeling early L. Ron Hubbard.

Forget the 100 million years ago. I’m even willing to ignore that “little” piece of information – that’s such a tiny little piece of the article that it doesn’t even matter for this one.

No – the reason I decided on Who cares about religion for the title had more to do with the next paragraph and with a comment posted on the article. More on the comment later – but here’s the second paragraph –

 But this week, in the prestigious journal Nature Genetics, researchers provide evidence for such a theory. Seeking to explain how our ancestors developed a more advanced kind of gestation—including the ability to carry fetuses in the womb until they reached a more developed state—scientists studied the uterine cells of three contemporary mammals. Specifically, they compared opossums (whose young develop largely in pouches) to armadillos and humans (whose offspring spend more time in the womb). They concluded that rogue DNA, which probably arrived by way of a virus or bug, was associated with wild new horizons in baby-making.


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