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Gene Digital Circuits Based on CRISPR-Cas Systems and Anti-CRISPR Proteins
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A spectrum of modularity in multi-functional gene circuits.

Alba Jiménez1,2, James Cotterell1,2, Andreea Munteanu1,2

  • 1EMBL-CRG Systems Biology Research Unit, Centre for Genomic Regulation, The Barcelona Institute of Science and Technology, Barcelona, Spain.

Molecular Systems Biology
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Biological circuits can perform multiple functions. Some circuits use distinct modules (hybrid), while others have emergent functions not easily broken down. Understanding emergent circuits is key to systems biology.

Keywords:
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Area of Science:

  • Systems biology
  • Synthetic biology
  • Computational biology

Background:

  • Understanding the structure-function relationship in biological circuits is crucial.
  • Multi-functional biological circuits present a challenge in determining modularity and function.
  • Existing research often focuses on modular systems, potentially overlooking other designs.

Purpose of the Study:

  • To computationally survey bi-functional circuits and investigate the relationship between circuit structure and multiple functions.
  • To determine if and to what extent multi-functional circuits contain modules reflecting their different functions.
  • To identify distinct classes of bi-functional circuits and analyze their properties.

Main Methods:

  • Computational survey of bi-functional circuits.
  • Analysis of circuit structure and function dependency.
  • Classification of circuits into hybrid and emergent categories.

Main Results:

  • Identified two classes of bi-functional circuits: hybrid and emergent.
  • Hybrid circuits overlay simpler mono-functional sub-circuits.
  • Emergent circuits exhibit bi-functionality through complex, non-modular designs where all genes contribute to both functions.

Conclusions:

  • Emergent bi-functional circuits are not fully decomposable into distinct modules.
  • Emergent circuits are as robust as hybrid circuits.
  • A bias toward studying modular systems may limit our understanding of real biological circuits.