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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.
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.
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.
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