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Gene duplication and the adaptive evolution of a classic genetic switch

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  • Chris Todd Hittinger

    (Howard Hughes Medical Institute, Laboratory of Genetics, University of Wisconsin-Madison, 1525 Linden Drive, Madison, Wisconsin 53706, USA
    Present address: Center for Genome Sciences, School of Medicine, Washington University in St Louis, 4444 Forest Park Avenue, St Louis, Missouri 63108, USA.)

  • Sean B. Carroll

    (Howard Hughes Medical Institute, Laboratory of Genetics, University of Wisconsin-Madison, 1525 Linden Drive, Madison, Wisconsin 53706, USA)

Abstract

How gene duplication and divergence contribute to genetic novelty and adaptation has been of intense interest, but experimental evidence has been limited. The genetic switch controlling the yeast galactose use pathway includes two paralogous genes in Saccharomyces cerevisiae that encode a co-inducer (GAL3) and a galactokinase (GAL1). These paralogues arose from a single bifunctional ancestral gene as is still present in Kluyveromyces lactis. To determine which evolutionary processes shaped the evolution of the two paralogues, here we assess the effects of precise replacement of coding and non-coding sequences on organismal fitness. We suggest that duplication of the ancestral bifunctional gene allowed for the resolution of an adaptive conflict between the transcriptional regulation of the two gene functions. After duplication, previously disfavoured binding site configurations evolved that divided the regulation of the ancestral gene into two specialized genes, one of which ultimately became one of the most tightly regulated genes in the genome.

Suggested Citation

  • Chris Todd Hittinger & Sean B. Carroll, 2007. "Gene duplication and the adaptive evolution of a classic genetic switch," Nature, Nature, vol. 449(7163), pages 677-681, October.
    • Handle: RePEc:nat:nature:v:449:y:2007:i:7163:d:10.1038_nature06151
    DOI: 10.1038/nature06151
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    Cited by:

    1. Alex N Nguyen Ba & Bob Strome & Jun Jie Hua & Jonathan Desmond & Isabelle Gagnon-Arsenault & Eric L Weiss & Christian R Landry & Alan M Moses, 2014. "Detecting Functional Divergence after Gene Duplication through Evolutionary Changes in Posttranslational Regulatory Sequences," PLOS Computational Biology, Public Library of Science, vol. 10(12), pages 1-15, December.
    2. Joseph Bozorgmehr, 2012. "Natural selection as a paradigm of opportunism in biology," Journal of Bioeconomics, Springer, vol. 14(1), pages 61-75, April.

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