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Brief communication: Methods of sequence heterochrony for describing modular developmental changes in human evolution
1Department of Anthropology, University of Missouri, Columbia, MO 65211, USA. blomquistg@missouri.edu
American Journal of Physical Anthropology
|November 13, 2008
Summary
Analyzing developmental sequences reveals shifts in human and chimpanzee limb ossification timing, likely due to locomotor differences. Developmental modules identified in the ankle, wrist, and hind limb suggest localized gene control.
Area of Science:
- Evolutionary biology
- Developmental biology
- Comparative anatomy
Background:
- Understanding human anatomical evolution requires examining developmental sequences beyond size and shape.
- Phenotypic integration during development offers insights into evolutionary changes.
Purpose of the Study:
- To analyze developmental sequences of limb element ossification in humans and chimpanzees.
- To investigate the utility of sequence analysis techniques for identifying developmental modules and evolutionary shifts.
Main Methods:
- Applied event-pair cracking and Poe's test for modularity to literature data on ossification timing.
- Utilized radiographic data on the age of ossification center appearance in human and chimpanzee limb elements.
Main Results:
- Sequence analysis revealed shifts in ossification timing between humans and chimpanzees, correlating with locomotor differences.
- Poe's test identified the ankle, wrist, and hind limb as distinct developmental modules.
- Ossification patterns in the hand and foot rays showed limited modularity.
Conclusions:
- Developmental sequence analysis provides valuable insights into evolutionary changes in anatomy.
- Identified developmental modules suggest localized genetic control over specific anatomical regions.
- Further integration of sequence analysis with traditional morphometric methods is warranted.
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