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Stochastic signalling rewires the interaction map of a multiple feedback network during yeast evolution

Author

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  • Chieh Hsu

    (Biozentrum, University of Basel)

  • Simone Scherrer

    (Institute of Molecular Life Sciences, University of Zurich)

  • Antoine Buetti-Dinh

    (Institute of Molecular Life Sciences, University of Zurich)

  • Prasuna Ratna

    (Institute of Molecular Life Sciences, University of Zurich)

  • Julia Pizzolato

    (Institute of Molecular Life Sciences, University of Zurich)

  • Vincent Jaquet

    (Biozentrum, University of Basel)

  • Attila Becskei

    (Biozentrum, University of Basel)

Abstract

During evolution, genetic networks are rewired through strengthening or weakening their interactions to develop new regulatory schemes. In the galactose network, the GAL1/GAL3 paralogues and the GAL2 gene enhance their own expression mediated by the Gal4p transcriptional activator. The wiring strength in these feedback loops is set by the number of Gal4p binding sites. Here we show using synthetic circuits that multiplying the binding sites increases the expression of a gene under the direct control of an activator, but this enhancement is not fed back in the circuit. The feedback loops are rather activated by genes that have frequent stochastic bursts and fast RNA decay rates. In this way, rapid adaptation to galactose can be triggered even by weakly expressed genes. Our results indicate that nonlinear stochastic transcriptional responses enable feedback loops to function autonomously, or contrary to what is dictated by the strength of interactions enclosing the circuit.

Suggested Citation

  • Chieh Hsu & Simone Scherrer & Antoine Buetti-Dinh & Prasuna Ratna & Julia Pizzolato & Vincent Jaquet & Attila Becskei, 2012. "Stochastic signalling rewires the interaction map of a multiple feedback network during yeast evolution," Nature Communications, Nature, vol. 3(1), pages 1-10, January.
    • Handle: RePEc:nat:natcom:v:3:y:2012:i:1:d:10.1038_ncomms1687
    DOI: 10.1038/ncomms1687
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    Cited by:

    1. Kevin K. Y. Hu & Ankita Suri & Geoff Dumsday & Victoria S. Haritos, 2024. "Cross-feeding promotes heterogeneity within yeast cell populations," Nature Communications, Nature, vol. 15(1), pages 1-16, December.

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