Mouse Dspp frameshift model of human dentinogenesis imperfecta

Non-syndromic inherited defects of tooth dentin are caused by two classes of dominant negative/gain-of-function mutations in dentin sialophosphoprotein ( DSPP ): 5′ mutations affecting an N-terminal targeting sequence and 3′ mutations that shift translation into the − 1 reading frame. DSPP defects c...

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Bibliographic Details
Published in:	Scientific reports Vol. 11; no. 1; p. 20653
Main Authors:	Liang, Tian, Hu, Yuanyuan, Zhang, Hong, Xu, Qian, Smith, Charles E., Zhang, Chuhua, Kim, Jung-Wook, Wang, Shih-Kai, Saunders, Thomas L., Lu, Yongbo, Hu, Jan C.-C., Simmer, James P.
Format:	Journal Article
Language:	English
Published:	London Nature Publishing Group UK 19-10-2021 Nature Publishing Group Nature Portfolio
Subjects:	631/136 631/208 631/535 692/699 Amino acids Animals CRISPR Dental enamel Dental Enamel - metabolism Dentin Dentin - metabolism Dentinogenesis Dentinogenesis imperfecta Dentinogenesis Imperfecta - genetics Dentinogenesis Imperfecta - metabolism Dentinogenesis Imperfecta - physiopathology Disease Models, Animal Dspp protein Dysplasia Enamel Extracellular Matrix Proteins - genetics Extracellular Matrix Proteins - metabolism Female Frameshift Mutation - genetics Gene deletion Humanities and Social Sciences Humans Hybridization Immunohistochemistry Incisors Male Mice Mice, Transgenic Molars multidisciplinary Mutation Phenotype Phenotypes Phosphoproteins - genetics Phosphoproteins - metabolism Science Science (multidisciplinary) Sialoglycoproteins - genetics Sialoglycoproteins - metabolism Teeth Tooth - metabolism Tubules
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Summary:	Non-syndromic inherited defects of tooth dentin are caused by two classes of dominant negative/gain-of-function mutations in dentin sialophosphoprotein ( DSPP ): 5′ mutations affecting an N-terminal targeting sequence and 3′ mutations that shift translation into the − 1 reading frame. DSPP defects cause an overlapping spectrum of phenotypes classified as dentin dysplasia type II and dentinogenesis imperfecta types II and III. Using CRISPR/Cas9, we generated a Dspp −1fs mouse model by introducing a FLAG-tag followed by a single nucleotide deletion that translated 493 extraneous amino acids before termination. Developing incisors and/or molars from this mouse and a Dspp P19L mouse were characterized by morphological assessment, bSEM, nanohardness testing, histological analysis, in situ hybridization and immunohistochemistry. Dspp P19L dentin contained dentinal tubules but grew slowly and was softer and less mineralized than the wild-type. Dspp P19L incisor enamel was softer than normal, while molar enamel showed reduced rod/interrod definition. Dspp −1fs dentin formation was analogous to reparative dentin: it lacked dentinal tubules, contained cellular debris, and was significantly softer and thinner than Dspp +/+ and Dspp P19L dentin. The Dspp −1fs incisor enamel appeared normal and was comparable to the wild-type in hardness. We conclude that 5′ and 3′ Dspp mutations cause dental malformations through different pathological mechanisms and can be regarded as distinct disorders.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	2045-2322 2045-2322
DOI:	10.1038/s41598-021-00219-4