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Enamelin and autosomal-dominant amelogenesis imperfecta
1Department of Orthodontics and Pediatric Dentistry, University of Michigan, School of Dentistry, 1011 North University, Ann Arbor, MI 48109-1078, USA. janhu@umich.edu
Summary
Enamelin is crucial for dental enamel formation. Mutations in the ENAM gene cause various forms of amelogenesis imperfecta, highlighting its role in human dental disease.
Area of Science:
- Biochemistry
- Genetics
- Developmental Biology
Background:
- Dental enamel is an extracellular layer formed by ameloblasts secreting proteins.
- Amelogenin (AMELX) is the most abundant enamel protein, while ameloblastin (AMBN) and enamelin (ENAM) are key non-amelogenin proteins.
Purpose of the Study:
- To review the discovery, structure, modifications, and function of enamelin.
- To discuss the human enamelin gene, its expression, and its role in amelogenesis imperfecta.
Main Methods:
- Comparative analysis of enamelin primary structures across species.
- Review of genetic studies linking ENAM mutations to amelogenesis imperfecta.
Main Results:
- Mutations in AMELX cause X-linked amelogenesis imperfecta (5% of cases).
- ENAM mutations cause severe (1.5%) and mild (27%) autosomal-dominant hypoplastic amelogenesis imperfecta.
- Enamelin's affinity for hydroxyapatite and influence on crystal growth are key functional properties.
Conclusions:
- Enamelin is essential for proper dental enamel formation and is implicated in human disease.
- Understanding enamelin's function is critical for addressing genetic disorders of tooth enamel.