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Biology Direct

, 3:18

First Online: 14 May 2008Received: 07 May 2008Accepted: 14 May 2008


BackgroundThe evolution of complex molecular traits such as disulphide bridges often requires multiple mutations. The intermediate steps in such evolutionary trajectories are likely to be selectively neutral or deleterious. Therefore, large populations and long times may be required to evolve such traits.

ResultsWe propose that errors in transcription and translation may allow selection for the intermediate mutations, if the final trait provides a large enough selective advantage. We test this hypothesis using a population based model of protein evolution.

ConclusionIf an individual acquires one of two mutations needed for a novel trait, the second mutation can be introduced into the phenotype due to transcription and translation errors. If the novel trait is advantageous enough, the allele with only one mutation will spread through the population, even though the gene sequence does not yet code for the complettrait. Thus, errors allow protein sequences to -look-ahead- for a more direct path to a complex trait.

ReviewersThis article was reviewed by Eugene Koonin, Subhajyoti De nomimated by Madan Babu, and David Krakauer.

Electronic supplementary materialThe online version of this article doi:10.1186-1745-6150-3-18 contains supplementary material, which is available to authorized users.

Dion J Whitehead, Claus O Wilke contributed equally to this work.

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Autor: Dion J Whitehead - Claus O Wilke - David Vernazobres - Erich Bornberg-Bauer


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