Abstract
Amelogenin is the most abundant matrix protein guiding hydroxyapatite formation in enamel, the durable bioceramic tissue that covers vertebrate teeth. Here, we sought to refine structure-function for an amelogenin domain based on in vitro data showing that a 42-amino acid amelogenin-derived peptide (ADP7) mimicked the formation of hydroxyapatite similar to that observed for the full-length mouse 180-amino acid protein. In mice, we used CRISPR-Cas9 to express only ADP7 by the native amelogenin promoter. Analysis revealed ADP7 messenger RNA expression in developing mouse teeth with the formation of a thin layer of enamel. In vivo, ADP7 peptide partially replaced the function of the full-length amelogenin protein and its several protein isoforms. Protein structure–function relationships identified through in vitro assays can be deployed in whole model animals using CRISPR-Cas9 to validate the function of a minimal protein domain to be translated for clinical use as an enamel biomimetic.
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Discussions with colleagues were instructive and appreciated. The comments of the three anonymous reviewers served to improve the manuscript and we are grateful for their guidance.
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Geng, S., Lei, Y. & Snead, M.L. Minimal Amelogenin Domain for Enamel Formation. JOM 73, 1696–1704 (2021). https://doi.org/10.1007/s11837-021-04687-x
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DOI: https://doi.org/10.1007/s11837-021-04687-x