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Information Theory in Living Systems, Methods, Applications, and Challenges

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Abstract

Living systems are distinguished in nature by their ability to maintain stable, ordered states far from equilibrium. This is despite constant buffeting by thermodynamic forces that, if unopposed, will inevitably increase disorder. Cells maintain a steep transmembrane entropy gradient by continuous application of information that permits cellular components to carry out highly specific tasks that import energy and export entropy. Thus, the study of information storage, flow and utilization is critical for understanding first principles that govern the dynamics of life. Initial biological applications of information theory (IT) used Shannon’s methods to measure the information content in strings of monomers such as genes, RNA, and proteins. Recent work has used bioinformatic and dynamical systems to provide remarkable insights into the topology and dynamics of intracellular information networks. Novel applications of Fisher-, Shannon-, and Kullback–Leibler informations are promoting increased understanding of the mechanisms by which genetic information is converted to work and order. Insights into evolution may be gained by analysis of the the fitness contributions from specific segments of genetic information as well as the optimization process in which the fitness are constrained by the substrate cost for its storage and utilization. Recent IT applications have recognized the possible role of nontraditional information storage structures including lipids and ion gradients as well as information transmission by molecular flux across cell membranes. Many fascinating challenges remain, including defining the intercellular information dynamics of multicellular organisms and the role of disordered information storage and flow in disease.

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Authors and Affiliations

  1. Department of Radiology, University Medical Center, University of Arizona, 1501 North Campbell Avenue, Tucson, Arizona, 85724, USA

    Robert A. Gatenby

  2. Department of Applied Mathematics, University of Arizona, 1501 North Campbell Avenue, Tucson, Arizona, 85724, USA

    Robert A. Gatenby

  3. Department of Optical Science, University of Arizona, Tucson, Arizona, 85724, USA

    B. Roy Frieden

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  1. Robert A. Gatenby
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  2. B. Roy Frieden
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Correspondence to Robert A. Gatenby.

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Gatenby, R.A., Frieden, B.R. Information Theory in Living Systems, Methods, Applications, and Challenges. Bull. Math. Biol. 69, 635–657 (2007). https://doi.org/10.1007/s11538-006-9141-5

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  • DOI: https://doi.org/10.1007/s11538-006-9141-5

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