Evolution of complexity

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Evolution of complexity

Postby Anonymous » Tue Oct 24, 2006 8:38 am

Now that I've caught some people's attention...yes that is the title of a real article being published in PNAS:


Evolution of complexity in signaling pathways OPEN ACCESS ARTICLE
Orkun S. Soyer and Sebastian Bonhoeffer
http://www.pnas.org/cgi/content/abstrac ... 103v1?etoc

Good genes sexual selection in nature
John A. Byers and Lisette Waits
http://www.pnas.org/cgi/content/abstrac ... 103v1?etoc
Anonymous
 

Re: Evolution of complexity

Postby Timothy Chase » Tue Oct 24, 2006 2:22 pm

mikeybrass wrote:Now that I've caught some people's attention...yes that is the title of a real article being published in PNAS:

Evolution of complexity in signaling pathways OPEN ACCESS ARTICLE
Orkun S. Soyer and Sebastian Bonhoeffer
http://www.pnas.org/cgi/content/abstrac ... 103v1?etoc


In silica models also predict greater modularity in variable environments, thereby promoting evolvability, and likewise demonstrate that selection more rapidly reaches optima under recombination in large populations, whereas the effects of recombination are substantially different in small populations. (I will try looking up the articles a little later.)

In smaller effective populations (where the effective population size is roughly equal to the harmonic mean of successive generation population size), selection is relaxed, thereby making it more likely that gene duplicates will survive long enough to be coopted for other functions. Then as the effective population size increases (much less rapidly than the actual population size), selection will gradually increase, streamlining various functions - which would seem to be comparable to the increased protein pathway length under weak selection mentioned in the paper you cite. In either case, successive rounds of population size reduction (including fragmentation, perhaps as the result of ecological disturbances of various scales) and increase should lead to increased complexity, whether it is measured in terms genomic complexity or protein paths.

*

In any case, this is the sort of thing that I enjoy - trying to push the envelope of my understanding. And it is much easier to do when there are others who similarly engaged.
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