title: A novel splicing mutation alters DSPP transcription and leads to dentinogenesis imperfecta type II.
abstract: Dentinogenesis imperfecta (DGI) type II is an autosomal dominant disease characterized by a serious disorders in teeth. Mutations of dentin sialophosphoprotein (DSPP) gene were revealed to be the causation of DGI type II (DGI-II). In this study, we identified a novel mutation (NG_011595.1:g.8662T>C, c.135+2T>C) lying in the splice donor site of intron 3 of DSPP gene in a Chinese Han DGI-II pedigree. It was found in all affected subjects but not in unaffected ones or other unrelated healthy controls. The function of the mutant DSPP gene, which was predicted online and subsequently confirmed by in vitro splicing analysis, was the loss of splicing of intron 3, leading to the extended length of DSPP mRNA. For the first time, the functional non-splicing of intron was revealed in a novel DSPP mutation and was considered as the causation of DGI-II. It was also indicated that splicing was of key importance to the function of DSPP and this splice donor site might be a sensitive mutation hot spot. Our findings combined with other reports would facilitate the genetic diagnosis of DGI-II, shed light on its gene therapy and help to finally conquer human diseases.
authors: Department of Digestive Diseases, Fudan University, Huashan Hospital, Shanghai, China.
authors: Jun
authors: J
authors: Zhang
authors: Jiucun
authors: J
authors: Wang
authors: Yanyun
authors: Y
authors: Ma
authors: Wenqi
authors: W
authors: Du
authors: Siyang
authors: S
authors: Zhao
authors: Zuowei
authors: Z
authors: Zhang
authors: Xiaojiao
authors: X
authors: Zhang
authors: Yue
authors: Y
authors: Liu
authors: Huasheng
authors: H
authors: Xiao
authors: Hongyan
authors: H
authors: Wang
authors: Li
authors: L
authors: Jin
authors: Jie
authors: J
authors: Liu
mesh_terms: D001483:Base Sequence; D004252:DNA Mutational Analysis; D003811:Dentinogenesis Imperfecta / Q000145:classification / Q000235:genetics*; D016326:Extracellular Matrix Proteins / Q000235:genetics*; D005192:Family Health; D005260:Female; D020022:Genetic Predisposition to Disease; D006801:Humans; D008297:Male; D009154:Mutation; D010375:Pedigree; D010750:Phosphoproteins / Q000235:genetics*; D012326:RNA Splicing; D012795:Sialoglycoproteins / Q000235:genetics*; D014158:Transcription, Genetic; D000099311:Dentin Sialophosphoprotein
chemical_list: D016326:Extracellular Matrix Proteins; D010750:Phosphoproteins; D012795:Sialoglycoproteins; D000099311:Dentin Sialophosphoprotein