Abstract
We argue that the physics of complex materials and self-organizing processes should be made central to the biology of form. Rather than being encoded in genes, form emerges when cells and certain of their molecules mobilize physical forces, effects, and processes in a multicellular context. What is inherited from one generation to the next are not genetic programs for constructing organisms, but generative mechanisms of morphogenesis and pattern formation and the initial and boundary conditions for reproducing the specific traits of a taxon. There is no inherent antagonism between this “physicalist” perspective and genetics, since physics acts on matter, and gene products are essential material components of living systems whose variability affects the systems’ parameters. We make this notion concrete by summarizing the concept of “dynamical patterning modules” (DPMs; Newman and Bhat, Phys Biol 5:1–14, 2008; Int J Dev Biol 53:693–705, 2009), an explicit physico-genetic framework for the origin and evolution of multicellular form in animals, as well as (when differences in interaction toolkit genes and applicable physical processes are taken into account) in multicellular plants (Hernández-Hernández et al., Int J Dev Biol 56:661–674, 2012). DPMs provide the missing link between development and evolution by revealing how genes acting in concert with physics can generate and transform morphology in a heritable fashion.
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Acknowledgments
We thank the National Science Foundation (Grant EF-0526854 awarded to SAN) and the European Commission (Marie Curie Fellowship PIOF-GA-2008-219676 awarded to ML-M) for support.
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Newman, S.A., Linde-Medina, M. Physical Determinants in the Emergence and Inheritance of Multicellular Form. Biol Theory 8, 274–285 (2013). https://doi.org/10.1007/s13752-013-0116-0
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DOI: https://doi.org/10.1007/s13752-013-0116-0