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Related Experiment Videos

Developmental evolution: this side of paradise.

A Graham1, I McGonnell

  • 1Molecular Neurobiology Group 4th Floor Hodgkin Building Kings College London Guys Campus London, SE1 9RT, UK. anthony.graham@kcl.ac.uk

Current Biology : CB
|October 6, 1999
PubMed
Summary
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Snake evolution involved limb loss and body elongation, but the developmental causes were unclear. New research reveals that changes in Hox gene expression and early hindlimb bud development explain these evolutionary changes.

Area of Science:

  • Developmental biology
  • Evolutionary biology
  • Genetics

Background:

  • The evolution of snakes is characterized by significant morphological changes, including limb reduction and vertebral axis elongation.
  • The precise developmental mechanisms underlying these snake evolutionary modifications have remained largely unexplored.

Purpose of the Study:

  • To elucidate the developmental basis for snake-specific evolutionary traits, specifically limb loss and axis elongation.
  • To investigate the roles of gene regulation and embryonic development in snake evolution.

Main Methods:

  • Analysis of gene expression patterns, focusing on Hox genes crucial for axial patterning.
  • Examination of embryonic development, particularly the formation and patterning of limb primordia in snake embryos.

Related Experiment Videos

  • Comparative developmental studies between snakes and other vertebrates.

    • Main Results:

    • Significant alterations in the spatial and temporal deployment of Hox genes were identified in snake embryos compared to other vertebrates.
    • An early developmental block in the formation of hindlimb primordia was observed, preceding limb bud differentiation.
    • These genetic and developmental changes correlate with the evolutionary loss of limbs and the elongation of the body axis in snakes.

    Conclusions:

    • Altered Hox gene expression and early hindlimb developmental defects are key developmental underpinnings of snake evolutionary modifications.
    • This study provides a mechanistic link between genetic changes and major morphological transitions in vertebrate evolution.
    • Understanding these developmental processes offers insights into the broader field of evolutionary developmental biology (Evo-Devo).