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The split-hand and split-foot anomaly in a central African Negro population
American Journal of Medical Genetics
|November 1, 1984
Summary
Split-hand and split-foot anomaly, also known as ectrodactyly, was studied in a large African kindred across multiple generations. This autosomal dominant trait exhibits variable expression, affecting only hands and feet.
Area of Science:
- Medical Genetics
- Human Genetics
- Congenital Anomalies
Background:
- Split-hand and split-foot anomaly (ectrodactyly) is a rare congenital malformation.
- Understanding its inheritance patterns is crucial for genetic counseling and research.
Purpose of the Study:
- To investigate the inheritance pattern of ectrodactyly in a multigenerational kindred.
- To document the phenotypic variability of this condition within a specific population.
Main Methods:
- Pedigree analysis was conducted across three generations of a kindred from a remote African village.
- Clinical examination of affected individuals to document the extent of hand and foot malformations.
Main Results:
- Ectrodactyly was identified in five individuals across three generations, with seven additional affected individuals in subsequent generations.
- The condition followed an autosomal dominant inheritance pattern with variable expression.
- Bilateral triphalangeal thumbs were observed in three affected individuals, indicating further phenotypic heterogeneity.
Conclusions:
- Ectrodactyly in this kindred is inherited as an autosomal dominant trait.
- Variable expressivity is a key feature of ectrodactyly, manifesting in different degrees of severity and associated anomalies like triphalangeal thumbs.