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Open Access Research article

A novel DSPP mutation is associated with type II dentinogenesis Imperfecta in a chinese family

Xianqin Zhang13, Lanying Chen2, Jingyu Liu1, Zhen Zhao2, Erjun Qu2, Xiaotao Wang2, Wei Chang1, Chengqi Xu1, Qing K Wang13* and Mugen Liu1*

Author Affiliations

1 Key Laboratory of Molecular Biophysics of the Ministry of Education, College of Life Science and Technology and Center for Human Genome Research, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China

2 Department of Bioengineering, Henan Urban Engineering College, Pingdingshan, 467001, China

3 Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic, and Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine of Case Western Reserve University, Cleveland, Ohio 44195, USA

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BMC Medical Genetics 2007, 8:52  doi:10.1186/1471-2350-8-52

Published: 8 August 2007

Abstract

Background

Hereditary defects of tooth dentin are classified into two main groups: dentin dysplasia (DD) (types I and II) and dentinogenesis imperfecta (DGI) (types I, II, and III). Type II DGI is one of the most common tooth defects with an autosomal dominant mode of inheritance. One disease-causing gene, the dentin sialophosphoprotein (DSPP) gene, has been reported for type II DGI.

Methods

In this study, we characterized a four-generation Chinese family with type II DGI that consists of 18 living family members, including 8 affected individuals. Linkage analysis with polymorphic markers D4S1534 and D4S414 that span the DSPP gene showed that the family is linked to DSPP. All five exons and exon-intron boundaries of DSPP were sequenced in members of type II DGI family.

Results

Direct DNA sequence analysis identified a novel mutation (c.49C→T, p.Pro17Ser) in exon 1 of the DSPP gene. The mutation spot, the Pro17 residue, is the second amino acid of the mature DSP protein, and highly conserved during evolution. The mutation was identified in all affected individuals, but not in normal family members and 100 controls.

Conclusion

These results suggest that mutation p.Pro17Ser causes type II DGI in the Chinese family. This study identifies a novel mutation in the DSPP gene, and expands the spectrum of mutations that cause DGI.