Non-Syndromic Dentinogenesis Imperfecta Caused by Mild Mutations in COL1A2

Journal of Personalized Medicine

卷:11

Zang Hee Lee¹  Youn Jung Kim²  Hong-Keun Hyun³  Jung-Wook Kim³  Yejin Lee³  Jae-Cheoun Lee⁴ 

[1] Department of Cell and Developmental Biology, School of Dentistry & DRI, Seoul National University, Seoul 03080, Korea;

[2] Department of Molecular Genetics, School of Dentistry & DRI, Seoul National University, Seoul 03080, Korea;

[3] Department of Pediatric Dentistry, School of Dentistry & DRI, Seoul National University, Seoul 03080, Korea;

[4] Seoul Chungdam Children’s Dental Center, Seoul 06072, Korea;

关键词: hereditary;    mutational hotspot;    dentinogenesis imperfecta;    isolated dentin defect;    tooth;    discoloration;   

DOI  :  10.3390/jpm11060526

来源: DOAJ

【 摘 要 】

Hereditary dentin defects can be categorized as a syndromic form predominantly related to osteogenesis imperfecta (OI) or isolated forms without other non-oral phenotypes. Mutations in the gene encoding dentin sialophosphoprotein (DSPP) have been identified to cause dentinogenesis imperfecta (DGI) Types II and III and dentin dysplasia (DD) Type II. While DGI Type I is an OI-related syndromic phenotype caused mostly by monoallelic mutations in the genes encoding collagen type I alpha 1 chain (COL1A1) and collagen type I alpha 2 chain (COL1A2). In this study, we recruited families with non-syndromic dentin defects and performed candidate gene sequencing for DSPP exons and exon/intron boundaries. Three unrelated Korean families were further analyzed by whole-exome sequencing due to the lack of the DSPP mutation, and heterozygous COL1A2 mutations were identified: c.3233G>A, p.(Gly1078Asp) in Family 1 and c.1171G>A, p.(Gly391Ser) in Family 2 and 3. Haplotype analysis revealed different disease alleles in Families 2 and 3, suggesting a mutational hotspot. We suggest expanding the molecular genetic etiology to include COL1A2 for isolated dentin defects in addition to DSPP.

【 授权许可】

Unknown