Cited by 62Gene Regulatory Network Analysisstochastic dynamics and bifurcationMicrobial Metabolic Engineering and Bioproduction

Combined Model of Intrinsic and Extrinsic Variability for Computational Network Design with Application to Synthetic Biology

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Toni, Tina, Tidor, Bruce·2013·PLoS Computational Biology

Abstract

Biological systems are inherently variable, with their dynamics influenced by intrinsic and extrinsic sources. These systems are often only partially characterized, with large uncertainties about specific sources of extrinsic variability and biochemical properties. Moreover, it is not yet well understood how different sources of variability combine and affect biological systems in concert. To successfully design biomedical therapies or synthetic circuits with robust performance, it is crucial to account for uncertainty and effects of variability. Here we introduce an efficient modeling and simulation framework to study systems that are simultaneously subject to multiple sources of variability, and apply it to make design decisions on small genetic networks that play a role of basic design elements of synthetic circuits. Specifically, the framework was used to explore the effect of transcriptional and post-transcriptional autoregulation on fluctuations in protein expression in simple genetic networks. We found that autoregulation could either suppress or increase the output variability, depending on specific noise sources and network parameters. We showed that transcriptional autoregulation was more successful than post-transcriptional in suppressing variability across a wide range of intrinsic and extrinsic magnitudes and sources. We derived the following design principles to guide the design of circuits that best suppress variability: (i) high protein cooperativity and low miRNA cooperativity, (ii) imperfect complementarity between miRNA and mRNA was preferred to perfect complementarity, and (iii) correlated expression of mRNA and miRNA--for example, on the same transcript--was best for suppression of protein variability. Results further showed that correlations in kinetic parameters between cells affected the ability to suppress variability, and that variability in transient states did not necessarily follow the same principles as variability in the steady state. Our model and findings provide a general framework to guide design principles in synthetic biology.

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  1. [9]Kim BS (2010) Robust Network Calibration and Therapy Design in Systems Biology [Ph.D. thesis]. Massachusetts Institute of Technology
  2. [36]van Der Merwe R (2004) Sigma-point Kalman filters for probabilistic inference in dynamic statespace models [Ph.D. thesis]. Oregon Health & Science University
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Authors
Toni, T., & Tidor, B.
Affiliations
  • Massachusetts Institute of Technology (US)
  • MIT Computer Science and Artificial Intelligence Laboratory (US)
Corresponding author
  • Toni, Tina
  • Tidor, Bruce
Venue
PLoS Computational Biology
Published
2013-03-28
Volume
9
Issue
3
Pages
e1002960
ISSN
  • 1553-734X (ISSN-L)
  • 1553-7358
OpenAlex
W1537859107
Cited by
62
References
61
Citations by year
2024: 2 · 2022: 7 · 2021: 5 · 2020: 8 · 2019: 5 · 2018: 2 · 2017: 7 · 2016: 8 · 2015: 9 · 2014: 8 · 2013: 1
FWCI
3.88
Type
journal article
Language
en
Open access
Locations
  • PLoS Computational Biology (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • DSpace@MIT (Massachusetts Institute of Technology) (submittedVersion, cc-by-nc)
  • Figshare (submittedVersion, cc-by)
  • PLoS eBooks
Funders
  • Wellcome Trust (090433/Z/09/Z, 090433)
  • National Institutes of Health (CA112967)
  • National Cancer Institute (CA 112967, U54CA112967)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gene Regulatory Network Analysis
  • Physical Sciences › Physics and Astronomy › Statistical and Nonlinear Physics › stochastic dynamics and bifurcation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Microbial Metabolic Engineering and Bioproduction
Keywords
intrinsic variability, noise reduction, synthetic gene circuits, transcriptional autoregulation, microRNA, protein cooperativity
MeSH terms
Algorithms, Gene Expression Regulation, Models, Genetic, RNA, Messenger, Transcription, Genetic, Computational Biology, MicroRNAs, Synthetic Biology

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