Amelogenins are extracellular matrix proteins that, along with other proteins like ameloblastins, enamelins, and tuftelins, direct the mineralization of enamel to form a highly organized matrix of rods and interrod crystal proteins . During the development of human enamel, amelogenins constitute about 90% of the total protein content . They are believed to regulate the initiation and growth of hydroxyapatite crystals, which are essential for the mineralization process .
The AMELX gene is located on the X chromosome at Xp22.1–Xp22.3 . Mutations in this gene can lead to a rare genetic condition known as Amelogenesis Imperfecta 1E (AI1E), characterized by abnormal tooth enamel development . The gene’s location on the X chromosome means that males (with one X chromosome) and females (with two X chromosomes) can exhibit different patterns of inheritance and expression of amelogenin .
Recombinant amelogenin, specifically the X-linked human isoform, is produced using Escherichia coli (E. coli) expression systems . This recombinant protein is used in various research and therapeutic applications. It is supplied as a lyophilized powder, prepared from a filtered solution of amelogenin in 2% acetic acid without any additives . The biological activity of recombinant amelogenin is measured by its ability to promote the attachment of Saos-2 cells to a coated surface .
Amelogenin has several potential therapeutic applications, including: