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ENAM mutations in autosomal-dominant amelogenesis imperfecta
1Department of Orthodontics and Pediatric Dentistry, University of Michigan Dental Research Lab, 1210 Eisenhower Place, Ann Arbor, MI 48108, USA.
Journal of Dental Research
|February 23, 2005
Summary
Mutations in the enamelin gene (ENAM) cause hypoplastic amelogenesis imperfecta, often with horizontal grooves. Enamel defect severity varies, even within families carrying the same ENAM mutation.
Area of Science:
- Genetics
- Developmental Biology
- Dentistry
Background:
- Amelogenesis imperfecta (AI) is a group of inherited enamel defects.
- Enamelin (ENAM) is a key protein in enamel formation.
- Previous studies identified 4 unique ENAM gene defects in AI kindreds.
Purpose of the Study:
- To investigate the role of enamelin in normal enamel formation.
- To identify genotype/phenotype correlations in AI.
- To characterize enamel phenotypes associated with novel and known ENAM mutations.
Main Methods:
- Genetic analysis of ENAM gene in kindreds with hypoplastic AI.
- Phenotypic characterization of enamel defects.
- Mutation identification: g.4806A>C (IVS6-2A>C) and g.8344delG.
Main Results:
- Identified 2 ENAM mutations (1 novel, 1 known) in families with hypoplastic AI.
- The IVS6-2A>C mutation resulted in severe enamel hypoplasia with horizontal grooves.
- The g.8344delG mutation caused generalized hypoplastic enamel with shallow horizontal grooves.
Conclusions:
- ENAM gene mutations are a cause of hypoplastic AI, frequently presenting with horizontal grooves.
- The severity of enamel defects can be variable, even among individuals with the same ENAM mutation.
- Understanding ENAM mutations aids in diagnosing and managing AI.