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The origin and evolution of appendages.

Alessandro Minelli1

  • 1Department of Biology, University of Padova, Italy. alessandro.minelli@unipd.it

The International Journal of Developmental Biology
|February 6, 2004
PubMed
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Understanding animal appendage evolution requires a new comparative framework beyond Cartesian axes. This research proposes axis paramorphisms, contrasting with gene co-option, to explain appendage development and evolution, challenging existing Evo-Devo perspectives.

Area of Science:

  • Developmental Biology
  • Evolutionary Biology
  • Comparative Anatomy

Background:

  • Current understanding of animal appendage evolution relies on gene expression and developmental mechanisms.
  • Existing frameworks for appendage description and evolution lack a comprehensive comparative approach.
  • The Cartesian co-ordinate system and gene co-option hypothesis are insufficient for explaining appendage origins.

Purpose of the Study:

  • To propose a new comparative framework for understanding animal appendage evolution.
  • To challenge the Cartesian co-ordinate system and gene co-option hypotheses.
  • To re-evaluate the concept of a 'default' arthropod appendage.

Main Methods:

  • Comparative analysis of appendage development across taxa.

Related Experiment Videos

  • Theoretical modeling of body axis-appendage relationships.
  • Critique of existing evolutionary developmental biology (Evo-Devo) paradigms.

    • Main Results:

    • Suggests categorizing diverse structures like gut diverticula and 'virtual appendages' within a broader definition.
    • Proposes the hypothesis of axis paramorphisms, where main body axes influence appendage growth and patterning.
    • Contrasts axis paramorphisms with the gene co-option hypothesis.
    • Challenges the notion of recapitulationism in Evo-Devo studies of appendage origins.
    • Argues against the existence of a 'default' arthropod appendage, suggesting early appendages formed on an already patterned body axis.

    Conclusions:

    • A factorial notion of homology and a new comparative framework are needed for appendage evolution.
    • Axis paramorphisms offer a potentially more accurate model for appendage development and patterning.
    • The evolutionary origin of appendages is likely linked to pre-existing body axis patterning, not solely gene co-option or recapitulation.