What is it about?
How did humans evolve a hand ideal for tool use and feet ideal for walking upright? The answer lies in modular genetic architecture. Our new study dives into the genomic landscape of the "autopod" (hand and foot) to understand how these structures co-evolved. While uses for the hand and foot may seem distinct, the evolutionary changes are quite similar (e.g., large thumb/big toe). This study shows that the hand and foot bones share highly similar gene expression and regulatory profiles, suggesting that changes to one limb likely have similar impacts on the other. As this study found greater evidence of evolutionary changes patterning the foot than the hand, this supports the idea that evolutionary pressures on the foot (for bipedal walking) drove corresponding changes in the hand. Overall, this study provides strong evidence that, despite their distinct uses, the stories of the human hand and foot are deeply intertwined.
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Why is it important?
This study shows how evolutionary selection on one trait, can impact other traits when they share a genomic and developmental architecture.
Perspectives
Writing this article was a great pleasure as it has co-authors with whom I have had both long standing and new collaborations. The fun part was where the science took us.
Terence Capellini
Harvard University
Read the Original
This page is a summary of: Modular genetic architecture underlies human hand and foot evolution, Proceedings of the National Academy of Sciences, May 2026, Proceedings of the National Academy of Sciences,
DOI: 10.1073/pnas.2603297123.
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