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Related Experiment Video

Updated: May 14, 2026

Estimation of Contact Regions Between Hands and Objects During Human Multi-Digit Grasping
09:41

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Published on: April 21, 2023

Modular genetic architecture underlies human hand and foot evolution.

Alexander S Okamoto1, Gayani Senevirathne1, Pushpanathan Muthuirulan1

  • 1Department of Human Evolutionary Biology, Harvard University, Cambridge, MA 02138.

Proceedings of the National Academy of Sciences of the United States of America
|May 12, 2026
PubMed
Summary

Human hand and foot evolution involved significant skeletal changes. Genetic analysis reveals distinct developmental modules, with more human-specific genetic features in the foot, supporting its crucial role in bipedalism.

Keywords:
evolutiongeneticshuman foothuman handskeleton

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Area of Science:

  • Evolutionary biology
  • Developmental genetics
  • Paleoanthropology

Background:

  • The functional divergence of human hands (prehension) and feet (locomotion) is a key evolutionary event.
  • Primate forelimbs and hindlimbs are serially homologous, suggesting linked evolutionary changes.
  • Previous studies often examined hand and foot adaptations separately.

Purpose of the Study:

  • To investigate the genetic architecture of human hand and foot evolution.
  • To identify regulatory elements and gene expression patterns in developing human autopods.
  • To explore the relationship between genetic changes and anatomical divergence between humans and apes.

Main Methods:

  • Functional genomics to analyze gene expression and regulatory elements.
  • Studied developing phalanges and metacarpals of the human hand and foot.
  • Identified genetic modules based on expression and regulatory activity patterns.

Main Results:

  • Identified distinct genetic modules separating metapodials from phalanges and, to a lesser extent, anterior-posterior axes and limb types.
  • Found enrichments of human-specific genomic features within these genetic modules.
  • Observed stronger enrichment of human-specific features in the foot compared to the hand.

Conclusions:

  • Human autopod evolution is characterized by a modular genetic architecture.
  • Human-specific genomic features potentially explain anatomical differences in hands and feet.
  • Greater genetic changes in the foot support its enhanced role in bipedal locomotion during human evolution.