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Evolution and development of the dentition.
Birth Defects Original Article Series
|January 1, 1983
Summary
Human teeth genetics evolved over 500 million years, with stable mineral matrices and adaptable shapes. Genes controlling tooth development offer insights into variations and tissue structures.
Area of Science:
- Evolutionary biology
- Developmental genetics
- Paleontology
Background:
- The genetic basis for human teeth originated in early vertebrates over 500 million years ago.
- Tooth development involves stable genetic information for mineralized matrices and evolving components for shape and number.
Observation:
- Tooth shape and number are tightly regulated by genes, responding to environmental selection similar to bone.
- Embryonic tooth buds exhibit developmental independence, capable of in vitro development.
- Genetic control of tooth size/shape correlates with jaw development, though jaws are more environmentally plastic.
Findings:
- Mutations affecting tooth development occur at multiple levels, from embryonic bud formation to root development.
- The molecular and submolecular mechanisms underlying genetic tooth control are beginning to be elucidated.
- Tooth germs serve as a valuable model system for studying these genetic processes.
Implications:
- Understanding tooth genetics enhances knowledge of dental variation and its relationship to normal and abnormal tissue structures.
- Insights into tooth development can inform studies on craniofacial development and genetic disorders.
- This research bridges evolutionary history with molecular mechanisms of development.