Hype from New Scientist Aside, Lenski's E. coliResearch Shows Evolution of Nothing New
Casey Luskin June 25, 2015 10:45 AM
As we reported in April, the pro-Darwin media love to print triumphalist articles, declaring on the thinnest of evidence that the "creationists" are deathly scared of the latest discoveries in science. Now New Scientist takes a turn, claiming that the E. coli research of Richard Lenski "has become a poster child for evolution, causing consternation among creationists trying to explain away its compelling evidence." Yet read the article carefully, and you'll see that it confirms Lenski's research did not show the evolution of anything new.
New Scientist frames the article this way:
Except that's not true. Normal E. coli already have the ability to feed on citrate -- they just don't typically do it under oxic conditions (i.e., where oxygen is present). The interesting thing about Lenski's research is that his bugs evolved the ability to uptake citrate under oxic conditions. But did anything new evolve? Here's what the article says:
What really happened? A switch that normally represses expression of CitT under oxic conditions was broken, so the citrate-uptake pathway got turned on. This isn't the evolution of a new molecular feature. It's the breaking of a molecular feature -- a repressor switch. Of course none of this is disclosed in the article.
But New Scientist isn't done. It goes on:
Again, did anything new evolve? No -- all we see is overexpression of pre-existing genes.
So in the end, E. coli are able to eat things that they could already metabolize before the experiments began. A molecular repressor switch has been broken, and another protein has been overexpressed.
Nothing new to see here: these are all the kinds of changes we already know Darwinian evolution can do -- breaking things at the molecular level, or making more of something you already have. This is how New Scientist spins it:
Bacteria are found almost everywhere on the earth -- from inside virtually every living organism to the deep sea to deep underground. They seem designed to be able to feed on just about anything they encounter. What Lenski may be seeing is the designed ability of bacteria to adapt to new environments using a diverse suite of metabolic pathways they have been gifted with, including the ability to break things or make more of them when needed.
The media will tell you that this shows the amazing power of "mindless" Darwinian evolution. A closer look at the facts reveals nothing of the sort.