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The autopod: its formation during limb development.

Koji Tamura1, Sayuri Yonei-Tamura, Tohru Yano

  • 1Department of Developmental Biology and Neurosciences, Graduate School of Life Sciences, Tohoku University, Aobayama, Aoba-ku, Sendai 980-8578, Japan. tam@biology.tohoku.ac.jp

Development, Growth & Differentiation
|May 8, 2008
PubMed
Summary
This summary is machine-generated.

The autopod, the furthest part of tetrapod limbs, forms via precise gene expression patterns. Understanding its development, including Hox genes and cell communication, offers insights into vertebrate evolution.

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Area of Science:

  • Developmental biology
  • Evolutionary developmental biology
  • Genetics

Background:

  • The autopod is the distalmost segment of the tetrapod limb, comprising the mesopodium and acropodium.
  • Autopod formation is a key model for studying developmental pattern formation.
  • Proximal limb elements differentiate before autopod cartilage rudiments develop.

Purpose of the Study:

  • To review the cellular and molecular regulation of autopod formation.
  • To explore the evolutionary developmental origins of the autopod.
  • To connect gene expression patterns with autopod development and evolution.

Main Methods:

  • Analysis of homeobox gene expression (Hoxa11, Hoxa13) during autopod development.
  • Investigation of upstream regulatory pathways, such as the retinoic acid pathway.
  • Examination of downstream effectors, including cell adhesion molecules (cadherins, ephrins/Ephs).
  • Comparative analysis of Hox gene expression in fish fins and tetrapod limb buds.

Main Results:

  • Autopod development is characterized by dynamic changes in Hoxa11 and Hoxa13 gene expression.
  • Retinoic acid signaling influences Hox gene expression patterns.
  • Autopod-specific cell surface molecules mediate cell communication and recognition.
  • Comparative studies suggest evolutionary links between fish fins and tetrapod autopods.

Conclusions:

  • Hox gene regulation and cell-cell interactions are crucial for autopod patterning.
  • Understanding autopod development provides insights into vertebrate limb evolution.
  • The study highlights the conserved genetic mechanisms underlying limb development across vertebrates.