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Statistical Properties and Robustness of Biological Controller-Target Networks

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  • Jacob D Feala
  • Jorge Cortes
  • Phillip M Duxbury
  • Andrew D McCulloch
  • Carlo Piermarocchi
  • Giovanni Paternostro

Abstract

Cells are regulated by networks of controllers having many targets, and targets affected by many controllers, in a “many-to-many” control structure. Here we study several of these bipartite (two-layer) networks. We analyze both naturally occurring biological networks (composed of transcription factors controlling genes, microRNAs controlling mRNA transcripts, and protein kinases controlling protein substrates) and a drug-target network composed of kinase inhibitors and of their kinase targets. Certain statistical properties of these biological bipartite structures seem universal across systems and species, suggesting the existence of common control strategies in biology. The number of controllers is ∼8% of targets and the density of links is 2.5%±1.2%. Links per node are predominantly exponentially distributed. We explain the conservation of the mean number of incoming links per target using a mathematical model of control networks, which also indicates that the “many-to-many” structure of biological control has properties of efficient robustness. The drug-target network has many statistical properties similar to the biological networks and we show that drug-target networks with biomimetic features can be obtained. These findings suggest a completely new approach to pharmacological control of biological systems. Molecular tools, such as kinase inhibitors, are now available to test if therapeutic combinations may benefit from being designed with biomimetic properties, such as “many-to-many” targeting, very wide coverage of the target set, and redundancy of incoming links per target.

Suggested Citation

  • Jacob D Feala & Jorge Cortes & Phillip M Duxbury & Andrew D McCulloch & Carlo Piermarocchi & Giovanni Paternostro, 2012. "Statistical Properties and Robustness of Biological Controller-Target Networks," PLOS ONE, Public Library of Science, vol. 7(1), pages 1-11, January.
    • Handle: RePEc:plo:pone00:0029374
    DOI: 10.1371/journal.pone.0029374
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    References listed on IDEAS

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