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Functional Evolution of a Cis-regulatory Module

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Journal PLoS Biol
Specialty Biology
Date 2005 Mar 11
PMID 15757364
Citations 121
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Abstract

Lack of knowledge about how regulatory regions evolve in relation to their structure-function may limit the utility of comparative sequence analysis in deciphering cis-regulatory sequences. To address this we applied reverse genetics to carry out a functional genetic complementation analysis of a eukaryotic cis-regulatory module-the even-skipped stripe 2 enhancer-from four Drosophila species. The evolution of this enhancer is non-clock-like, with important functional differences between closely related species and functional convergence between distantly related species. Functional divergence is attributable to differences in activation levels rather than spatiotemporal control of gene expression. Our findings have implications for understanding enhancer structure-function, mechanisms of speciation and computational identification of regulatory modules.

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