Dentinogenesis imperfecta 1 with or without progressive hearing loss is associated with distinct mutations in DSPP.

Abstract:

:Dentinogenesis imperfecta 1 (DGI1, MIM 125490) is an autosomal dominant dental disease characterized by abnormal dentin production and mineralization. The DGI1 locus was recently refined to a 2-Mb interval on 4q21 (ref. 1). Here we study three Chinese families carrying DGI1. We find that the affected individuals of two families also presented with progressive sensorineural high-frequency hearing loss (gene DFNA39). We identified three disease-specific mutations within the dentin sialophosphoprotein gene (DSPP) in these three families. We detected a G-->A transition at the donor-splicing site of intron 3 in one family without DFNA39, a mutation predicted to result in the skipping of exon 3. In two other families affected with both DGI1 and DFNA39, however, we identified two independent nucleotide transversions in exons 2 and 3 of DSPP, respectively, that cause missense mutations of two adjacent amino-acid residues in the predicted transmembrane region of the protein. Moreover, transcripts of DSPP previously reported to be expressed specifically in teeth are also detected in the inner ear of mice. We have thus demonstrated for the first time that distinct mutations in DSPP are responsible for the clinical manifestations of DGI1 with or without DFNA39.

journal_name

Nat Genet

journal_title

Nature genetics

authors

Xiao S,Yu C,Chou X,Yuan W,Wang Y,Bu L,Fu G,Qian M,Yang J,Shi Y,Hu L,Han B,Wang Z,Huang W,Liu J,Chen Z,Zhao G,Kong X

doi

10.1038/84848

keywords:

subject

Has Abstract

pub_date

2001-02-01 00:00:00

pages

201-4

issue

2

eissn

1061-4036

issn

1546-1718

journal_volume

27

pub_type

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