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      A Method to Categorize 2-Dimensional Patterns Using Statistics of Spatial Organization

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          Abstract

          We developed a measurement framework of spatial organization to categorize 2-dimensional patterns from 2 multiscalar biological architectures. We propose that underlying shapes of biological entities can be approached using the statistical concept of degrees of freedom, defining it through expansion of area variability in a pattern. To help scope this suggestion, we developed a mathematical argument recognizing the deep foundations of area variability in a polygonal pattern (spatial heterogeneity). This measure uses a parameter called eutacticity. Our measuring platform of spatial heterogeneity can assign particular ranges of distribution of spatial areas for 2 biological architectures: ecological patterns of Namibia fairy circles and epithelial sheets. The spatial organizations of our 2 analyzed biological architectures are demarcated by being in a particular position among spatial order and disorder. We suggest that this theoretical platform can give us some insights about the nature of shapes in biological systems to understand organizational constraints.

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          Most cited references23

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          Evolutionary dynamics of group interactions on structured populations: A review

          Interactions among living organisms, from bacteria colonies to human societies, are inherently more complex than interactions among particles and nonliving matter. Group interactions are a particularly important and widespread class, representative of which is the public goods game. In addition, methods of statistical physics have proven valuable for studying pattern formation, equilibrium selection, and self-organisation in evolutionary games. Here we review recent advances in the study of evolutionary dynamics of group interactions on structured populations, including lattices, complex networks and coevolutionary models. We also compare these results with those obtained on well-mixed populations. The review particularly highlights that the study of the dynamics of group interactions, like several other important equilibrium and non-equilibrium dynamical processes in biological, economical and social sciences, benefits from the synergy between statistical physics, network science and evolutionary game theory.
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            The emergence of geometric order in proliferating metazoan epithelia.

            The predominantly hexagonal cell pattern of simple epithelia was noted in the earliest microscopic analyses of animal tissues, a topology commonly thought to reflect cell sorting into optimally packed honeycomb arrays. Here we use a discrete Markov model validated by time-lapse microscopy and clonal analysis to demonstrate that the distribution of polygonal cell types in epithelia is not a result of cell packing, but rather a direct mathematical consequence of cell proliferation. On the basis of in vivo analysis of mitotic cell junction dynamics in Drosophila imaginal discs, we mathematically predict the convergence of epithelial topology to a fixed equilibrium distribution of cellular polygons. This distribution is empirically confirmed in tissue samples from vertebrate, arthropod and cnidarian organisms, suggesting that a similar proliferation-dependent cell pattern underlies pattern formation and morphogenesis throughout the metazoa.
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              Fundamental physical cellular constraints drive self-organization of tissues.

              Morphogenesis is driven by small cell shape changes that modulate tissue organization. Apical surfaces of proliferating epithelial sheets have been particularly well studied. Currently, it is accepted that a stereotyped distribution of cellular polygons is conserved in proliferating tissues among metazoans. In this work, we challenge these previous findings showing that diverse natural packed tissues have very different polygon distributions. We use Voronoi tessellations as a mathematical framework that predicts this diversity. We demonstrate that Voronoi tessellations and the very different tissues analysed share an overriding restriction: the frequency of polygon types correlates with the distribution of cell areas. By altering the balance of tensions and pressures within the packed tissues using disease, genetic or computer model perturbations, we show that as long as packed cells present a balance of forces within tissue, they will be under a physical constraint that limits its organization. Our discoveries establish a new framework to understand tissue architecture in development and disease.
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                Author and article information

                Journal
                Evol Bioinform Online
                Evol. Bioinform. Online
                Evolutionary Bioinformatics
                Evolutionary Bioinformatics Online
                SAGE Publications (Sage UK: London, England )
                1176-9343
                2017
                10 March 2017
                : 13
                : 1176934317697978
                Affiliations
                [1 ]National Council of Science and Technology (CONACYT), Mexico City, Mexico.
                [2 ]Department of Information Systems and Computational Sciences, Universidad Autónoma Metropolitana, Unidad Lerma, Lerma de Villada, Estado de Mexico, Mexico.
                [3 ]Department of Nanotechnology, Center for Applied Physics and Advanced Technology, Universidad Nacional Autónoma de México, Querétaro, Mexico.
                Author notes
                CORRESPONDING AUTHOR: Juan López-Sauceda, Av. Hidalgo Pte. 46, Col. La Estación, Lerma de Villada, Zip code 52006, Edo. de Mex., Mexico. Email: j.lopez@ 123456correo.ler.uam.mx
                Article
                10.1177_1176934317697978
                10.1177/1176934317697978
                5395257
                9f5a4f50-65fb-49f0-a1a3-fdd134f6e898
                © The Author(s) 2017

                This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License ( http://www.creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access page( https://us.sagepub.com/en-us/nam/open-access-at-sage).

                History
                : 25 November 2016
                : 31 January 2017
                Categories
                Original Research

                Bioinformatics & Computational biology
                spatial organization,pattern,shape,epithelial topology,namibia fairy circles

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