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AMELX
AMELX Full Name
amelogenin, X-linked
AMELX Introduction
AMELX is a protein-coding gene located on the X chromosome, encoding amelogenin, which serves as the most abundant extracellular matrix protein during dental enamel formation. Amelogenin is transiently yet abundantly expressed by ameloblasts and plays a fundamental role in controlling the structural organization and mechanical properties of enamel. As enamel develops, amelogenin acts as a scaffold that separates and supports growing mineral crystals, guiding their alignment in a manner that confers exceptional strength and durability to the hardened tissue. The protein is subsequently removed during maturation, leaving behind a highly mineralized enamel layer that contains only trace amounts of residual protein. Notably, amelogenin undergoes phosphorylation at a single serine residue (Ser16), a post-translational modification that critically regulates the rate of mineral deposition and stabilizes the enamel matrix during biomineralization. Alternative splicing of AMELX generates multiple isoforms with distinct temporal expression patterns, reflecting the complex regulatory demands of enamel formation.
Figure 1. Structural and functional proteins for the tooth enamel matrix development and its distinguishability for male and female individual. (Source: Dash HR, et al. 2020)
Mutations in AMELX are responsible for X-linked amelogenesis imperfecta (AI), a heterogeneous hereditary disorder characterized by defective enamel development. Depending on the specific mutation, AI phenotypes may present as hypoplastic (reduced enamel thickness), hypomaturation (improperly mineralized enamel), or mixed patterns. Males, possessing only a single X chromosome, typically exhibit severe enamel defects with thin, soft, and discolored tooth surfaces. In contrast, females often display a milder and more variable phenotype due to X-chromosome inactivation (lyonization), resulting in alternating vertical bands of normal and affected enamel on individual teeth. Recent whole-exome studies continue to identify novel pathogenic variants, further expanding the genotypic spectrum of this condition and refining the genotype–phenotype correlations that inform genetic counseling.
Alternate Names for AMELX
AMELX; amelogenin, X-linked; AIH1, amelogenin (X chromosome, amelogenesis imperfecta 1); AMG; amelogenin, X isoform; amelogenesis imperfecta 1; amelogenin (amelogenesis imperfecta 1, X-linked); amelogenin (X chromosome, amelogenesis imperfecta 1); AMG; AI1E; AIH1; ALGN; AMGL; AMGX;
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