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Amelogenin: lessons from evolution.
Jean-Yves Sire1, Sidney Delgado, Delphine Fromentin
1Equipe Evolution and Développement du Squelette, CNRS FRE 2696, Université Paris 6-Pierre and Marie Curie, CNRS FRE 2696, Case 7077, 2, place Jussieu, 75251 Paris Cedex 05, France. sire@ccr.jussieu.fr
Archives of Oral Biology
|February 22, 2005
Summary
Evolutionary analysis reveals amelogenin
Area of Science:
- Evolutionary biology
- Molecular biology
- Genetics
Background:
- Amelogenin is vital for tooth enamel formation and mineralization.
- Understanding amelogenin's domain functions is crucial but challenging.
- Evolutionary analysis offers insights into protein structure-function relationships.
Purpose of the Study:
- To review current knowledge on amelogenin evolution.
- To present new data on amelogenin's origin and evolutionary history.
- To explore structure-function relationships through evolutionary comparisons.
Main Methods:
- Comparative sequence analysis of amniote amelogenins.
- Evolutionary analysis of conserved and variable regions.
- Genome sequencing and gene mapping.
- BLAST searches for gene family relationships.
Main Results:
- Amelogenin's central region is highly variable, shaped by triplet insertions.
- N- and C-terminal domains are highly conserved across 250 million years.
- Rapid evolution observed in lizard and snake amelogenins.
- Amelogenin shares gene organization and sequence similarity with ameloblastin and enamelin.
- Evidence suggests amelogenin evolved from ameloblastin or enamelin, originating from SPARC.
Conclusions:
- Conserved amelogenin domains are critical for structure and function.
- Evolutionary insights aid in validating human amelogenin mutations.
- Amelogenin likely arose from gene duplication events predating 600 million years ago.
- Amelogenin, ameloblastin, and enamelin form a related gene family with a common ancestor.