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The tetrapod limb: a hypothesis on its origin.

G P Wagner1, C H Chiu

  • 1Department of Ecology and Evolutionary Biology, Yale University, New Haven, Connecticut 06520-8106, USA. gunter.wagner19@yale.edu

The Journal of Experimental Zoology
|October 13, 2001
PubMed
Summary

The evolution of the tetrapod limb from fish fins involved changes in gene expression, specifically Hoxa-11 and Hoxa-13. These genetic shifts likely facilitated the development of the autopodium (hand/foot) during the aquatic-to-terrestrial transition.

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Area of Science:

  • Evolutionary biology
  • Developmental biology
  • Paleontology

Background:

  • The transition from aquatic fins to terrestrial limbs in vertebrates is a key evolutionary event.
  • Early tetrapods like *Eustenopteron* lacked wrist joints and digits, indicating significant fin-to-limb modifications.
  • Understanding the fin-limb transition requires examining both paleontological and developmental evidence.

Purpose of the Study:

  • To review paleontological evidence for the fin-limb transition.
  • To propose a genetic hypothesis for the origin of the tetrapod autopodium (hand/foot).
  • To investigate the role of gene expression in limb development.

Main Methods:

  • Review of paleontological data on early tetrapod limbs and fish fins.
  • Comparative analysis of tetrapod limb bud and zebrafish fin development.

Related Experiment Videos

  • Examination of gene expression patterns, focusing on Hoxa-11 and Hoxa-13.

    • Main Results:

    • The zeugopodial-mesopodial transition, differentiating proximal and distal limb parts, is identified as a key innovation.
    • In tetrapods, Hoxa-11 and Hoxa-13 exhibit exclusive expression domains along the limb bud's proximal-distal axis.
    • In zebrafish fins, these genes show overlapping expression, with no autopodial equivalent.
    • The distinct expression boundaries of Hoxa-11 and Hoxa-13 correlate with the zeugopodial-autopodial boundary in tetrapods.

    Conclusions:

    • The evolution of distinct expression patterns for Hoxa-11 and Hoxa-13 is proposed as a causal factor in the origin of the tetrapod limb.
    • This genetic shift likely underlies the development of the autopodium, enabling terrestrial locomotion.
    • The study highlights the interplay between genetic mechanisms and major evolutionary transitions.