Colloquium Papers: Emerging principles of regulatory evolution. Prud'homme, B., Gompel, N., & Carroll, S. B Proc Natl Acad Sci U S A, 104 Suppl 1:8605-12, 2007. doi abstract bibtex Understanding the genetic and molecular mechanisms governing the evolution of morphology is a major challenge in biology. Because most animals share a conserved repertoire of body-building and -patterning genes, morphological diversity appears to evolve primarily through changes in the deployment of these genes during development. The complex expression patterns of developmentally regulated genes are typically controlled by numerous independent cis-regulatory elements (CREs). It has been proposed that morphological evolution relies predominantly on changes in the architecture of gene regulatory networks and in particular on functional changes within CREs. Here, we discuss recent experimental studies that support this hypothesis and reveal some unanticipated features of how regulatory evolution occurs. From this growing body of evidence, we identify three key operating principles underlying regulatory evolution, that is, how regulatory evolution: (i) uses available genetic components in the form of preexisting and active transcription factors and CREs to generate novelty; (ii) minimizes the penalty to overall fitness by introducing discrete changes in gene expression; and (iii) allows interactions to arise among any transcription factor and downstream CRE. These principles endow regulatory evolution with a vast creative potential that accounts for both relatively modest morphological differences among closely related species and more profound anatomical divergences among groups at higher taxonomical levels.
@Article{Prudhomme2007,
author = {Benjamin Prud'homme and Nicolas Gompel and Sean B Carroll},
journal = {Proc Natl Acad Sci U S A},
title = {Colloquium {P}apers: {E}merging principles of regulatory evolution.},
year = {2007},
pages = {8605-12},
volume = {104 Suppl 1},
abstract = {Understanding the genetic and molecular mechanisms governing the evolution
of morphology is a major challenge in biology. Because most animals
share a conserved repertoire of body-building and -patterning genes,
morphological diversity appears to evolve primarily through changes
in the deployment of these genes during development. The complex
expression patterns of developmentally regulated genes are typically
controlled by numerous independent cis-regulatory elements (CREs).
It has been proposed that morphological evolution relies predominantly
on changes in the architecture of gene regulatory networks and in
particular on functional changes within CREs. Here, we discuss recent
experimental studies that support this hypothesis and reveal some
unanticipated features of how regulatory evolution occurs. From this
growing body of evidence, we identify three key operating principles
underlying regulatory evolution, that is, how regulatory evolution:
(i) uses available genetic components in the form of preexisting
and active transcription factors and CREs to generate novelty; (ii)
minimizes the penalty to overall fitness by introducing discrete
changes in gene expression; and (iii) allows interactions to arise
among any transcription factor and downstream CRE. These principles
endow regulatory evolution with a vast creative potential that accounts
for both relatively modest morphological differences among closely
related species and more profound anatomical divergences among groups
at higher taxonomical levels.},
doi = {10.1073/pnas.0700488104},
keywords = {17494759},
}
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