Mutation in SSUH2 Causes Autosomal Dominant Dentin Dysplasia Type I

Xiong, F., Ji, Z., Liu, Y., Zhang, Y., Hu, L., Yang, Q., Qiu, Q., Zhao, L., Chen, D., Tian, Z., Shang, X., Zhang, L., Wei, X., Liu, C., Yu, Q., Zhang, M., Cheng, J., Xiong, J., Li, D., Wu, X., Yuan, H., Zhang, W., Xu, X.
Human Mutation   38(1): 95-104 (Journal)
Registered Authors
Zhang, Yu, Zhao, Lingfeng
DDI, Dentin dysplasia type I, Odontogenesis, SSUH2, mouse, zebrafish
MeSH Terms
  • Adolescent
  • Adult
  • Animals
  • Child
  • Child, Preschool
  • Chromosome Mapping
  • DNA Mutational Analysis
  • Dentin Dysplasia/diagnosis*
  • Dentin Dysplasia/genetics*
  • Female
  • Gene Knockdown Techniques
  • Genes, Dominant*
  • Genetic Association Studies*
  • Genetic Linkage
  • Genetic Predisposition to Disease*
  • High-Throughput Nucleotide Sequencing
  • Humans
  • Mice
  • Mice, Transgenic
  • Microsatellite Repeats
  • Molecular Chaperones/chemistry
  • Molecular Chaperones/genetics*
  • Molecular Chaperones/metabolism
  • Mutation*
  • Pedigree
  • Phenotype
  • Radiography
  • Young Adult
  • Zebrafish
27680507 Full text @ Hum. Mutat.
Dentin dysplasia type I (DDI) is an autosomal-dominant genetic disorder resulting from dentin defects. The molecular basis of DDI remains unclear. DDI exhibits unique characteristics with phenotypes featuring obliteration of pulp chambers and diminutive root, thus providing a useful model for understanding the genetics of tooth formation. Using a large Chinese family with 14 DDI patients, we mapped the gene locus responsible for DDI to 3p26.1-3p24.3 and further identified a missense mutation, c.353C>A (p.P118Q) in the SSUH2 gene on 3p26.1, which co-segregated with DDI. We showed that SSUH2 (p.P118Q) perturbed the structure and significantly reduced levels of mutant protein and mRNA compared to wild-type SSUH2. Furthermore, mutant P141Q knock-in mice (+/- and -/-) had a unique partial obliteration of the pulp cavity and upregulation or downregulation of six major genes involved in odontogenesis: Dspp, Dmp1, Runx2, Pax9, Bmp2 and Dlx2. The phenotype of missing teeth was determined in zebrafish with morpholino gene knockdowns and rescued by injection of normal human mRNA. Taken together, our observations demonstrate that SSUH2 disrupts dental formation and that this novel gene, together with other odontogenesis genes, is involved in tooth development.
Genes / Markers
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Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Engineered Foreign Genes