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Variable expression of familial hypodontia in monozygotic triplets
Scandinavian Journal of Dental Research
|February 1, 1981
Summary
This study found that identical triplets and their mother have hypodontia, a condition of missing teeth. Significant variations in how this trait presents suggest non-genetic factors influence its expression.
Area of Science:
- Dentistry
- Genetics
- Developmental Biology
Background:
- Hypodontia, the congenital absence of one or more teeth, can have genetic and environmental influences.
- Monozygotic (identical) twins and triplets share the same genetic material, making them valuable for studying gene-environment interactions.
Purpose of the Study:
- To investigate the expression of hypodontia in a family with monozygotic triplets.
- To explore the role of non-genetic factors in the variability of hypodontia.
Main Methods:
- Clinical examination of a mother and her monozygotic triplets.
- Phenotypic assessment of dental anomalies, specifically hypodontia.
Main Results:
- Hypodontia was observed in the mother and all three monozygotic triplets.
- Considerable variation in the pattern and severity of missing teeth was noted among the triplets.
- The intrapair variation in trait expression among the triplets indicates non-genetic influences.
Conclusions:
- Environmental factors play a significant role in the phenotypic expression of hypodontia, even in genetically identical individuals.
- Understanding these non-genetic factors is crucial for comprehending the etiology of hypodontia and for potential clinical interventions.