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Negative feedback in genetic circuits confers evolutionary resilience and capacitance.


ABSTRACT: Natural selection for specific functions places limits upon the amino acid substitutions a protein can accept. Mechanisms that expand the range of tolerable amino acid substitutions include chaperones that can rescue destabilized proteins and additional stability-enhancing substitutions. Here, we present an alternative mechanism that is simple and uses a frequently encountered network motif. Computational and experimental evidence shows that the self-correcting, negative-feedback gene regulation motif increases repressor expression in response to deleterious mutations and thereby precisely restores repression of a target gene. Furthermore, this ability to rescue repressor function is observable across the Eubacteria kingdom through the greater accumulation of amino acid substitutions in negative-feedback transcription factors compared to genes they control. We propose that negative feedback represents a self-contained genetic canalization mechanism that preserves phenotype while permitting access to a wider range of functional genotypes.

SUBMITTER: Marciano DC 

PROVIDER: S-EPMC4103627 | biostudies-literature | 2014 Jun

REPOSITORIES: biostudies-literature

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Negative feedback in genetic circuits confers evolutionary resilience and capacitance.

Marciano David C DC   Lua Rhonald C RC   Katsonis Panagiotis P   Amin Shivas R SR   Herman Christophe C   Lichtarge Olivier O  

Cell reports 20140605 6


Natural selection for specific functions places limits upon the amino acid substitutions a protein can accept. Mechanisms that expand the range of tolerable amino acid substitutions include chaperones that can rescue destabilized proteins and additional stability-enhancing substitutions. Here, we present an alternative mechanism that is simple and uses a frequently encountered network motif. Computational and experimental evidence shows that the self-correcting, negative-feedback gene regulation  ...[more]

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