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The inhibitory cascade model and evolution in segmentally organized tissues.

Benjamin M Auerbach1, Charles C Roseman2

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The inhibitory cascade model (ICM) for development and evolution is flawed. Our re-articulation shows its apparent success is an artifact of statistical scaling, not biological reality.

Keywords:
evolutionary developmental biologyevolutionary geneticsinhibitory cascadeserial growth

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Area of Science:

  • Developmental Biology
  • Evolutionary Biology
  • Morphogenesis

Background:

  • The inhibitory cascade model (ICM) links development to evolutionary variation.
  • It proposes serial traits like molar teeth are controlled by activating and inhibiting processes.
  • Previous applications show good fit for both sequential and non-sequential traits.

Purpose of the Study:

  • To critically re-evaluate the inhibitory cascade model (ICM).
  • To investigate whether the ICM's fit is an artifact of statistical standardization.
  • To test the ICM's validity across developmental, variational, and evolutionary levels.

Main Methods:

  • Re-articulated the mathematical and conceptual basis of the ICM.
  • Applied the re-articulated ICM to biological, non-biological, and simulated data.
  • Analyzed data using statistical methods to assess model fit.

Main Results:

  • Demonstrated that the apparent goodness of fit for the ICM is an artifact of scaling correlated values.
  • Found no evidence supporting the ICM at the developmental level.
  • Found no evidence supporting the ICM at the variational or evolutionary levels.

Conclusions:

  • The inhibitory cascade model (ICM) does not provide a valid explanation for morphogenesis.
  • The model's perceived success is an artifact of statistical methods, not biological processes.
  • There is no empirical support for the ICM across development, variation, or evolution.