Anybody seen this piece?
'Irreducible Complexity' is Reducible Afterall
Which brings us to the latest discovery in evolution: DNA needed to make synapses, the sophisticated junctions between neurons, in none other than the lowly sea sponge. Considered among the most primitive and ancient of all animals, sea sponges have no nervous system (or internal organs of any kind, for that matter), notes Todd Oakley, assistant professor in the Department of Ecology, Evolution and Marine Biology at the University of California, Santa Barbara. But, he adds, they “have most of the genetic components of synapses.”
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What were genes for synapses doing in a sponge, which has no neurons and therefore no synapses? This is where the irreducible-complexity crowd makes a fatal error: they assume that whatever the function of a biological component (gene, protein, biochemical pathway . . . ) today must have been its function in the past. Maybe you noticed that my mouse trap example above wasn’t very persuasive; even without a base and a bar, a spring can be a useful little device. So it goes with biological systems. For instance, of the 42 proteins known to make up the bacterial flagellum, 40 have been found to serve as ion channels or something else in bacteria. It is therefore perfectly plausible that they really were hanging around—serving some function that would have allowed evolution and natural selection to keep them around generation after generation—until they all got together and formed a flagellum.
So it seems to be with the genes for synapses. The sea sponge did not use them for their current purpose, but that doesn’t mean the genes had no use. “We found this mysterious unknown structure in the sponge, and it is clear that evolution was able to take this entire structure and, with small modifications, direct its use toward a new function,” said Kosik. “Evolution can take these ‘off the shelf’ components and put them together in new and interesting ways.”
http://blog.newsweek.com/blogs/labnotes/archive/2007/06/06/irreducible-complexity-is-reducible-afterall.aspx