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Programmed and self-organized flow of information during morphogenesis.

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Embryonic development relies on cell mechanics and behaviors, not just genes. This review explores how physical forces and geometry guide tissue shaping through deterministic and self-organizing processes.

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Area of Science:

  • Developmental Biology
  • Cellular Mechanics
  • Biophysics

Background:

  • Tissue morphogenesis, the emergence of shape in embryos and organs, is driven by cell behaviors like shape changes, migration, and division.
  • These behaviors depend on cell mechanics, including active stresses (protrusive, contractile, adhesive forces) and hydrostatic pressure, along with cell material properties.

Purpose of the Study:

  • To review how cell mechanics and behaviors are organized in space and time during tissue morphogenesis.
  • To outline how genetic, biochemical, mechanical, and geometric information guides cell behaviors.
  • To present two modes of information flow: deterministic (program-like) and self-organized.

Main Methods:

  • Literature review of developmental biology, cell mechanics, and biophysics.
  • Conceptual framework development for understanding morphogenetic information flow.
  • Analysis of four general classes of tissue deformation: folding/invagination, flow/extension, hollowing, and branching.

Main Results:

  • Morphogenesis integrates information from gene expression, biochemistry, mechanics, and geometry.
  • Two primary information processing modes exist: deterministic (hierarchical) and self-organized (statistical, local interactions).
  • Both modes contribute to diverse tissue deformations like folding, extension, hollowing, and branching.

Conclusions:

  • A conceptual framework is proposed where genetics, biochemistry, mechanics, and geometry are information modules.
  • The interplay of deterministic and self-organized mechanisms governs the deployment of these modules.
  • Embryonic shape arises from a complex interplay of factors beyond simple genetic encoding, challenging traditional views.