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Hassib NF, Mehrez M, Mostafa MI, Abdel-Hamid MS. Isolated dentinogenesis imperfecta: Novel DSPP variants and insights on genetic counselling. Clin Oral Investig 2024; 28:254. [PMID: 38630328 PMCID: PMC11024031 DOI: 10.1007/s00784-024-05636-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Accepted: 03/23/2024] [Indexed: 04/19/2024]
Abstract
OBJECTIVE Dentinogenesis imperfecta (DI) is an inherited dentin defect and may be isolated or associated with disorders such as osteogenesis imperfecta, odontochondrodysplasia Ehler-Danlos and others. Isolated DI is caused mainly by pathogenic variants in DSPP gene and around 50 different variants have been described in this gene. Herein, we report on 19 patients from two unrelated Egyptian families with isolated DI. Additionally, we focused on genetic counselling of the two families. MATERIALS AND METHODS The patients were examined clinically and dentally. Panoramic X-rays were done to some patients. Whole exome sequencing (WES) and Sanger sequencing were used. RESULTS WES revealed two new nonsense variants in DSPP gene, c.288T > A (p.Tyr96Ter) and c.255G > A (p.Trp85Ter). Segregation analysis by Sanger sequencing confirmed the presence of the first variant in all affected members of Family 1 while the second variant was confirmed to be de novo in the patient of Family 2. CONCLUSIONS AND CLINICAL RELEVANCE Our study extends the number of DSPP pathogenic variants and strengthens the fact that DSPP is the most common DI causative gene irrespective of patients' ethnicity. In addition, we provide insights on genetic counseling issues in patients with inherited DSPP variants taking into consideration the variable religion, culture and laws in our society.
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Affiliation(s)
- Nehal F Hassib
- Orodental Genetics Department, Human Genetics and Genome Research Institute, National Research Centre, 33 ElBohous street, Dokki, P.O.12622, Cairo, 3337 09 31, Egypt.
- School of dentistry, New Giza University, Giza, Egypt.
| | - Mennat Mehrez
- Orodental Genetics Department, Human Genetics and Genome Research Institute, National Research Centre, 33 ElBohous street, Dokki, P.O.12622, Cairo, 3337 09 31, Egypt
| | - Mostafa I Mostafa
- Orodental Genetics Department, Human Genetics and Genome Research Institute, National Research Centre, 33 ElBohous street, Dokki, P.O.12622, Cairo, 3337 09 31, Egypt
| | - Mohamed S Abdel-Hamid
- Medical Molecular Genetics Department, Human Genetics and Genome Research Institute, National Research Centre, Cairo, Egypt
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2
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Liang T, Smith CE, Hu Y, Zhang H, Zhang C, Xu Q, Lu Y, Qi L, Hu JCC, Simmer JP. Dentin defects caused by a Dspp -1 frameshift mutation are associated with the activation of autophagy. Sci Rep 2023; 13:6393. [PMID: 37076504 PMCID: PMC10115861 DOI: 10.1038/s41598-023-33362-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Accepted: 04/12/2023] [Indexed: 04/21/2023] Open
Abstract
Dentin sialophosphoprotein (DSPP) is primarily expressed by differentiated odontoblasts (dentin-forming cells), and transiently expressed by presecretory ameloblasts (enamel-forming cells). Disease-causing DSPP mutations predominantly fall into two categories: 5' mutations affecting targeting and trafficking, and 3' - 1 frameshift mutations converting the repetitive, hydrophilic, acidic C-terminal domain into a hydrophobic one. We characterized the dental phenotypes and investigated the pathological mechanisms of DsppP19L and Dspp-1fs mice that replicate the two categories of human DSPP mutations. In DsppP19L mice, dentin is less mineralized but contains dentinal tubules. Enamel mineral density is reduced. Intracellular accumulation and ER retention of DSPP is observed in odontoblasts and ameloblasts. In Dspp-1fs mice, a thin layer of reparative dentin lacking dentinal tubules is deposited. Odontoblasts show severe pathosis, including intracellular accumulation and ER retention of DSPP, strong ubiquitin and autophagy activity, ER-phagy, and sporadic apoptosis. Ultrastructurally, odontoblasts show extensive autophagic vacuoles, some of which contain fragmented ER. Enamel formation is comparable to wild type. These findings distinguish molecular mechanisms underlying the dental phenotypes of DsppP19L and Dspp-1fs mice and support the recently revised Shields classification of dentinogenesis imperfecta caused by DSPP mutations in humans. The Dspp-1fs mice may be valuable for the study of autophagy and ER-phagy.
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Affiliation(s)
- Tian Liang
- Department of Biologic and Materials Sciences, University of Michigan School of Dentistry, 1011 North University, Ann Arbor, MI, 48109-1078, USA.
| | - Charles E Smith
- Department of Biologic and Materials Sciences, University of Michigan School of Dentistry, 1011 North University, Ann Arbor, MI, 48109-1078, USA
- Department of Anatomy & Cell Biology, Faculty of Medicine & Health Sciences, McGill University, Montreal, QC, Canada
| | - Yuanyuan Hu
- Department of Biologic and Materials Sciences, University of Michigan School of Dentistry, 1011 North University, Ann Arbor, MI, 48109-1078, USA
| | - Hong Zhang
- Department of Biologic and Materials Sciences, University of Michigan School of Dentistry, 1011 North University, Ann Arbor, MI, 48109-1078, USA
| | - Chuhua Zhang
- Department of Biologic and Materials Sciences, University of Michigan School of Dentistry, 1011 North University, Ann Arbor, MI, 48109-1078, USA
| | - Qian Xu
- Department of Biomedical Sciences and Center for Craniofacial Research and Diagnosis, Texas A&M University College of Dentistry, 3302 Gaston Ave., Dallas, TX, 75246, USA
| | - Yongbo Lu
- Department of Biomedical Sciences and Center for Craniofacial Research and Diagnosis, Texas A&M University College of Dentistry, 3302 Gaston Ave., Dallas, TX, 75246, USA
| | - Ling Qi
- Department of Molecular & Integrative Physiology, Department of Internal Medicine, Division of Metabolism, Endocrinology and Diabetes, University of Michigan Medical School, 1000 Wall St., Ann Arbor, MI, 48105, USA
| | - Jan C-C Hu
- Department of Biologic and Materials Sciences, University of Michigan School of Dentistry, 1011 North University, Ann Arbor, MI, 48109-1078, USA
| | - James P Simmer
- Department of Biologic and Materials Sciences, University of Michigan School of Dentistry, 1011 North University, Ann Arbor, MI, 48109-1078, USA
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Zhang Z, Huang G, Huang Y, Liu S, Chen F, Gao X, Dong Y, Tian H. Novel dentin sialophosphoprotein gene frameshift mutations affect dentin mineralization. Arch Oral Biol 2023; 151:105701. [PMID: 37084484 DOI: 10.1016/j.archoralbio.2023.105701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2022] [Revised: 04/12/2023] [Accepted: 04/15/2023] [Indexed: 04/23/2023]
Abstract
OBJECTIVE This study aimed to identify candidate genes for inheritable dentin defects in three Chinese pedigrees and characterize the property of affected teeth. DESIGN Clinical and radiological features were recorded for the affected individuals. Genomic DNA obtained from peripheral venous blood or saliva were analyzed by whole-exome sequencing. The density and microhardness of affected dentin was measured. Scanning electron microscopy (SEM) was also performed to obtain the microstructure phenotype. RESULTS 1) General appearance: the affected dentitions shared yellowish-brown or milky color. Radiographs showed that the pulp cavity and root canals were obliterated in varying degrees or exhibited a pulp aspect in the 'thistle tube'. Some patients exhibited periapical infections without pulpal exposure, and some affected individuals showed shortened, abnormally thin roots accompanied by severe alveolar bone loss. 2) Genomic analysis: three new frameshift mutations (NM_014208.3: c.2833delA, c.2852delGand c.3239delA) were identified in exon 5 of dentin sialophosphoprotein (DSPP) gene, altering dentin phosphoprotein (DPP) as result. In vitro studies showed that the density and microhardness of affected dentin were decreased, the dentinal tubules were sparse and arranged disorderly, and the dentinal-enamel-junction (DEJ) was abnormal. CONCLUSIONS In this study, we identified three novel frameshift mutations of dentin sialophosphoprotein gene related to inherited dentin defects. These mutations are speculated to cause abnormal coding of dentin phosphoprotein C-terminus, which affect dentin mineralization. These results expand the spectrum of dentin sialophosphoprotein gene mutations causing inheritable dentin defects and broaden our understanding of the biological mechanisms by which dentin forms.
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Affiliation(s)
- Zhenwei Zhang
- Department of Cariology and Endodontology, Peking University School and Hospital of Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Beijing, PR China
| | - Guibin Huang
- Department of Cariology and Endodontology, Peking University School and Hospital of Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Beijing, PR China
| | - Yu Huang
- Department of Medical Genetics, School of Basic Medical Sciences, Peking University Health and Science Center, Beijing, PR China
| | - Siyi Liu
- Department of Cariology and Endodontology, Peking University School and Hospital of Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Beijing, PR China
| | - Feng Chen
- Central Laboratory, Peking University School and Hospital of Stomatology, National Center of Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Beijing, PR China
| | - Xuejun Gao
- Department of Cariology and Endodontology, Peking University School and Hospital of Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Beijing, PR China
| | - Yanmei Dong
- Department of Cariology and Endodontology, Peking University School and Hospital of Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Beijing, PR China.
| | - Hua Tian
- Department of Cariology and Endodontology, Peking University School and Hospital of Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Beijing, PR China.
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4
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Du Q, Cao L, Yan N, Kang S, Lin M, Cao P, Jia R, Wang C, Qi H, Yu Y, Zou J, Yang J. Identification of DSPP novel variants and phenotype analysis in dentinogenesis dysplasia Shields type II patients. Clin Oral Investig 2023:10.1007/s00784-023-05009-y. [PMID: 37017752 DOI: 10.1007/s00784-023-05009-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Accepted: 03/28/2023] [Indexed: 04/06/2023]
Abstract
OBJECTIVES To investigate the genetic causes and teeth characteristics of dentin dysplasia Shields type II(DD-II) in three Chinese families. MATERIALS AND METHODS Data from three Chinese families affected with DD-II were collected. Whole-exome sequencing (WES) and whole-genome sequencing (WGS) were conducted to screen for variations, and Sanger sequencing was used to verify mutation sites. The physical and chemical characteristics of the affected teeth including tooth structure, hardness, mineral content, and ultrastructure were investigated. RESULTS A novel frameshift deletion mutation c.1871_1874del(p.Ser624fs) in DSPP was found in families A and B, while no pathogenic mutation was found in family C. The affected teeth's pulp cavities were obliterated, and the root canals were smaller than normal teeth and irregularly distributed comprising a network. The patients' teeth also had reduced dentin hardness and highly irregular dentinal tubules. The Mg content of the teeth was significantly lower than that of the controls, but the Na content was obviously higher than that of the controls. CONCLUSIONS A novel frameshift deletion mutation, c.1871_1874del (p.Ser624fs), in the DPP region of the DSPP gene causes DD-II. The DD-II teeth demonstrated compromised mechanical properties and changed ultrastructure, suggesting an impaired function of DPP. Our findings expand the mutational spectrum of the DSPP gene and strengthen the understanding of clinical phenotypes related to the frameshift deletion in the DPP region of the DSPP gene. CLINICAL RELEVANCE A DSPP mutation can alter the characteristics of the affected teeth, including tooth structure, hardness, mineral content, and ultrastructure.
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Affiliation(s)
- Qin Du
- Department of Stomatology, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu, 610072, Sichuan, China
- School of Medicine, University of Electronic Science and Technology of China, Chengdu, 610054, Sichuan, China
| | - Li Cao
- The Sichuan Provincial Key Laboratory for Human Disease Gene Study, Centre for Medical Genetics, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, University of Electronic Science and Technology, No.32, Section 2, The First Ring Road West, Chengdu, 610072, China
- Research Unit for Blindness Prevention of Chinese Academy of Medical Sciences (2019RU026), Sichuan Academy of Medical Sciences, Chengdu, 610072, China
| | - Nana Yan
- Department of Stomatology, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu, 610072, Sichuan, China
| | - Sujun Kang
- Department of Stomatology, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu, 610072, Sichuan, China
| | - Mu Lin
- Department of Stomatology, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu, 610072, Sichuan, China
| | - Peilin Cao
- Department of Stomatology, Sichuan Provincial People's Hospital, University of Electronic Science and Technology of China, Chengdu, 610072, Sichuan, China
| | - Ran Jia
- School of Medicine, University of Electronic Science and Technology of China, Chengdu, 610054, Sichuan, China
| | - Chenyang Wang
- School of Medicine, University of Electronic Science and Technology of China, Chengdu, 610054, Sichuan, China
| | - Hanyu Qi
- School of Medicine, University of Electronic Science and Technology of China, Chengdu, 610054, Sichuan, China
| | - Yue Yu
- State Key Laboratory of Oral Diseases & Department of Pediatric Dentistry, West China Hospital of Stomatology, National Clinical Research Center for Oral Diseases, Sichuan University, No. 14 Section 3, Renmin South Road, Chengdu, 610041, China
| | - Jing Zou
- State Key Laboratory of Oral Diseases & Department of Pediatric Dentistry, West China Hospital of Stomatology, National Clinical Research Center for Oral Diseases, Sichuan University, No. 14 Section 3, Renmin South Road, Chengdu, 610041, China.
| | - Jiyun Yang
- School of Medicine, University of Electronic Science and Technology of China, Chengdu, 610054, Sichuan, China.
- The Sichuan Provincial Key Laboratory for Human Disease Gene Study, Centre for Medical Genetics, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, University of Electronic Science and Technology, No.32, Section 2, The First Ring Road West, Chengdu, 610072, China.
- Research Unit for Blindness Prevention of Chinese Academy of Medical Sciences (2019RU026), Sichuan Academy of Medical Sciences, Chengdu, 610072, China.
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Mack Wilson J, Bell C, Queck K, Scott K. A Review of Dentinogenesis Imperfecta and Primary Dentin Disorders in Dogs. J Vet Dent 2022; 39:376-390. [DOI: 10.1177/08987564221123419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
This review describes the clinical, radiographic and histologic characteristics of dentinogenesis imperfecta diagnosed in two unrelated young dogs without evidence of concurrent osteogenesis imperfecta. The dentition was noted to have generalized coronal discoloration ranging from grey-blue to golden brown. Clinical pulp exposure, coronal wear and fractures were observed as was radiographic evidence of endodontic disease, thin dentin walls or dystrophic obliteration of the pulp canal. The enamel was severely affected by attrition and abrasion despite histologically normal areas; loss was most likely due to poor adherence or support by the underlying abnormal dentin. Histologically, permanent and deciduous teeth examined showed thin, amorphous dentin without organized dentin tubules and odontoblasts had dysplastic cell morphology. Primary dentin disorders, including dentinogenesis imperfecta and dentin dysplasia, have been extensively studied and genetically characterized in humans but infrequently reported in dogs. Treatment in human patients is aimed at early recognition and multi-disciplinary intervention to restore and maintain normal occlusion, aesthetics, mastication and speech. Treatment in both humans and canine patients is discussed as is the documented genetic heritability of primary dentin disorders in humans.
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Affiliation(s)
| | - Cynthia Bell
- Specialty Oral Pathology for Animals, LLC, Geneseo, IL, USA
| | - Katherine Queck
- Hospital for Veterinary Dentistry and Oral Surgery, Matthews, NC, USA
| | - Kristin Scott
- Hospital for Veterinary Dentistry and Oral Surgery, Matthews, NC, USA
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6
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Kim YJ, Lee Y, Zhang H, Seymen F, Koruyucu M, Bayrak S, Tuloglu N, Simmer JP, Hu JCC, Kim JW. Translated Mutant DSPP mRNA Expression Level Impacts the Severity of Dentin Defects. J Pers Med 2022; 12:1002. [PMID: 35743786 PMCID: PMC9225647 DOI: 10.3390/jpm12061002] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Revised: 06/15/2022] [Accepted: 06/17/2022] [Indexed: 11/28/2022] Open
Abstract
Hereditary dentin defects are conventionally classified into three types of dentinogenesis imperfecta (DGI) and two types of dentin dysplasia (DD). Mutations in the dentin sialophosphoprotein (DSPP) gene have been identified to cause DGI type II and III and DD type II; therefore, these are not three different conditions, but rather allelic disorders. In this study, we recruited three families with varying clinical phenotypes from DGI-III to DD-II and performed mutational analysis by candidate gene analysis or whole-exome sequencing. Three novel mutations including a silent mutation (NM_014208.3: c.52-2del, c.135+1G>C, and c.135G>A; p.(Gln45=)) were identified, all of which affected pre-mRNA splicing. Comparison of the splicing assay results revealed that the expression level of the DSPP exon 3 deletion transcript correlated with the severity of the dentin defects. This study did not only expand the mutational spectrum of DSPP gene, but also advanced our understanding of the molecular pathogenesis impacting the severity of hereditary dentin defects.
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Affiliation(s)
- Youn Jung Kim
- Department of Pediatric Dentistry & DRI, School of Dentistry, Seoul National University, Seoul 03080, Korea; (Y.J.K.); (Y.L.)
| | - Yejin Lee
- Department of Pediatric Dentistry & DRI, School of Dentistry, Seoul National University, Seoul 03080, Korea; (Y.J.K.); (Y.L.)
| | - Hong Zhang
- Department of Biologic and Materials Sciences & Prosthodontics, School of Dentistry, University of Michigan, Ann Arbor, MI 48109, USA; (H.Z.); (J.P.S.); (J.C.-C.H.)
| | - Figen Seymen
- Department of Paediatric Dentistry, Faculty of Dentistry, Altinbas University, Istanbul 34147, Turkey;
| | - Mine Koruyucu
- Department of Pedodontics, Faculty of Dentistry, Istanbul University, Istanbul 34116, Turkey;
| | - Sule Bayrak
- Private Practice, Eskisehir 26150, Turkey; (S.B.); (N.T.)
| | - Nuray Tuloglu
- Private Practice, Eskisehir 26150, Turkey; (S.B.); (N.T.)
| | - James P. Simmer
- Department of Biologic and Materials Sciences & Prosthodontics, School of Dentistry, University of Michigan, Ann Arbor, MI 48109, USA; (H.Z.); (J.P.S.); (J.C.-C.H.)
| | - Jan C.-C. Hu
- Department of Biologic and Materials Sciences & Prosthodontics, School of Dentistry, University of Michigan, Ann Arbor, MI 48109, USA; (H.Z.); (J.P.S.); (J.C.-C.H.)
| | - Jung-Wook Kim
- Department of Pediatric Dentistry & DRI, School of Dentistry, Seoul National University, Seoul 03080, Korea; (Y.J.K.); (Y.L.)
- Department of Molecular Genetics & DRI, School of Dentistry, Seoul National University, Seoul 03080, Korea
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7
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The Modified Shields Classification and 12 Families with Defined DSPP Mutations. Genes (Basel) 2022; 13:genes13050858. [PMID: 35627243 PMCID: PMC9141616 DOI: 10.3390/genes13050858] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Revised: 04/28/2022] [Accepted: 05/03/2022] [Indexed: 12/14/2022] Open
Abstract
Mutations in Dentin Sialophosphoprotein (DSPP) are known to cause, in order of increasing severity, dentin dysplasia type-II (DD-II), dentinogenesis imperfecta type-II (DGI-II), and dentinogenesis imperfecta type-III (DGI-III). DSPP mutations fall into two groups: a 5′-group that affects protein targeting and a 3′-group that shifts translation into the −1 reading frame. Using whole-exome sequence (WES) analyses and Single Molecule Real-Time (SMRT) sequencing, we identified disease-causing DSPP mutations in 12 families. Three of the mutations are novel: c.53T>C/p.(Val18Ala); c.3461delG/p.(Ser1154Metfs*160); and c.3700delA/p.(Ser1234Alafs*80). We propose genetic analysis start with WES analysis of proband DNA to identify mutations in COL1A1 and COL1A2 causing dominant forms of osteogenesis imperfecta, 5′-DSPP mutations, and 3′-DSPP frameshifts near the margins of the DSPP repeat region, and SMRT sequencing when the disease-causing mutation is not identified. After reviewing the literature and incorporating new information showing distinct differences in the cell pathology observed between knockin mice with 5′-Dspp or 3′-Dspp mutations, we propose a modified Shields Classification based upon the causative mutation rather than phenotypic severity such that patients identified with 5′-DSPP defects be diagnosed as DGI-III, while those with 3′-DSPP defects be diagnosed as DGI-II.
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Jing Z, Chen Z, Jiang Y. Effects of DSPP Gene Mutations on Periodontal Tissues. Glob Med Genet 2021; 8:90-94. [PMID: 34430959 PMCID: PMC8378919 DOI: 10.1055/s-0041-1726416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Dentin sialophosphoprotein ( DSPP ) gene mutations cause autosomal dominantly inherited diseases. DSPP gene mutations lead to abnormal expression of DSPP, resulting in a series of histological, morphological, and clinical abnormalities. A large number of previous studies demonstrated that DSPP is a dentinal-specific protein, and DSPP gene mutations lead to dentin dysplasia and dentinogenesis imperfecta. Recent studies have found that DSPP is also expressed in bone, periodontal tissues, and salivary glands. DSPP is involved in the formation of the periodontium as well as tooth structures. DSPP deficient mice present furcation involvement, cementum, and alveolar bone defect. We speculate that similar periodontal damage may occur in patients with DSPP mutations. This article reviewed the effects of DSPP gene mutations on periodontal status. However, almost all of the research is about animal study, there is no evidence that DSPP mutations cause periodontium defects in patients yet. We need to conduct systematic clinical studies on DSPP mutation families in the future to elucidate the effect of DSPP gene on human periodontium.
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Affiliation(s)
- Zhaojun Jing
- Department of General Dentistry II, Peking University School and Hospital of Stomatology, National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing, People's Republic of China
| | - Zhibin Chen
- Department of Periodontology, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Beijing, People's Republic of China
| | - Yong Jiang
- Department of General Dentistry II, Peking University School and Hospital of Stomatology, National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing, People's Republic of China
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9
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Liu M, Li W, Xia X, Wang F, MacDougall M, Chen S. Dentine sialophosphoprotein signal in dentineogenesis and dentine regeneration. Eur Cell Mater 2021; 42:43-62. [PMID: 34275129 PMCID: PMC9019922 DOI: 10.22203/ecm.v042a04] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Dentineogenesis starts on odontoblasts, which synthesise and secrete non-collagenous proteins (NCPs) and collagen. When dentine is injured, dental pulp progenitors/mesenchymal stem cells (MSCs) can migrate to the injured area, differentiate into odontoblasts and facilitate formation of reactionary dentine. Dental pulp progenitor cell/MSC differentiation is controlled at given niches. Among dental NCPs, dentine sialophosphoprotein (DSPP) is a member of the small integrin-binding ligand N-linked glycoprotein (SIBLING) family, whose members share common biochemical characteristics such as an Arg-Gly-Asp (RGD) motif. DSPP expression is cell- and tissue-specific and highly seen in odontoblasts and dentine. DSPP mutations cause hereditary dentine diseases. DSPP is catalysed into dentine glycoprotein (DGP)/sialoprotein (DSP) and phosphoprotein (DPP) by proteolysis. DSP is further processed towards active molecules. DPP contains an RGD motif and abundant Ser-Asp/Asp-Ser repeat regions. DPP-RGD motif binds to integrin αVβ3 and activates intracellular signalling via mitogen-activated protein kinase (MAPK) and focal adhesion kinase (FAK)-ERK pathways. Unlike other SIBLING proteins, DPP lacks the RGD motif in some species. However, DPP Ser-Asp/Asp-Ser repeat regions bind to calcium-phosphate deposits and promote hydroxyapatite crystal growth and mineralisation via calmodulin-dependent protein kinase II (CaMKII) cascades. DSP lacks the RGD site but contains signal peptides. The tripeptides of the signal domains interact with cargo receptors within the endoplasmic reticulum that facilitate transport of DSPP from the endoplasmic reticulum to the extracellular matrix. Furthermore, the middle- and COOH-terminal regions of DSP bind to cellular membrane receptors, integrin β6 and occludin, inducing cell differentiation. The present review may shed light on DSPP roles during odontogenesis.
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Affiliation(s)
- M.M. Liu
- Department of Developmental Dentistry, School of Dentistry, the University of Texas Health Science Center at San Antonio, San Antonio, TX 78229, USA,Department of Endodontics, School of Stomatology, Tongji University, Shanghai, 200072, China
| | - W.T. Li
- Department of Developmental Dentistry, School of Dentistry, the University of Texas Health Science Center at San Antonio, San Antonio, TX 78229, USA,Department of Pathology, Weifang Medical University, Weifang, 261053, China
| | - X.M. Xia
- Department of Developmental Dentistry, School of Dentistry, the University of Texas Health Science Center at San Antonio, San Antonio, TX 78229, USA,Department of Obstetrics and Gynaecology, Second Xiangya Hospital, Central South University Changsha, 410011, China
| | - F. Wang
- Department of Anatomy, Fujian Medical University, Fuzhou, 350122, China
| | - M. MacDougall
- UBC Faculty of Dentistry, University of British Columbia, Vancouver, BC, V6T 1Z3, Canada
| | - S. Chen
- Department of Developmental Dentistry, School of Dentistry, the University of Texas Health Science Center at San Antonio, San Antonio, TX 78229, USA
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10
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Non-Syndromic Dentinogenesis Imperfecta Caused by Mild Mutations in COL1A2. J Pers Med 2021; 11:jpm11060526. [PMID: 34201399 PMCID: PMC8229930 DOI: 10.3390/jpm11060526] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Revised: 06/07/2021] [Accepted: 06/08/2021] [Indexed: 11/16/2022] Open
Abstract
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.
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Bányai L, Trexler M, Kerekes K, Csuka O, Patthy L. Use of signals of positive and negative selection to distinguish cancer genes and passenger genes. eLife 2021; 10:e59629. [PMID: 33427197 PMCID: PMC7877913 DOI: 10.7554/elife.59629] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Accepted: 01/10/2021] [Indexed: 12/14/2022] Open
Abstract
A major goal of cancer genomics is to identify all genes that play critical roles in carcinogenesis. Most approaches focused on genes positively selected for mutations that drive carcinogenesis and neglected the role of negative selection. Some studies have actually concluded that negative selection has no role in cancer evolution. We have re-examined the role of negative selection in tumor evolution through the analysis of the patterns of somatic mutations affecting the coding sequences of human genes. Our analyses have confirmed that tumor suppressor genes are positively selected for inactivating mutations, oncogenes, however, were found to display signals of both negative selection for inactivating mutations and positive selection for activating mutations. Significantly, we have identified numerous human genes that show signs of strong negative selection during tumor evolution, suggesting that their functional integrity is essential for the growth and survival of tumor cells.
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Affiliation(s)
- László Bányai
- Institute of Enzymology, Research Centre for Natural SciencesBudapestHungary
| | - Maria Trexler
- Institute of Enzymology, Research Centre for Natural SciencesBudapestHungary
| | - Krisztina Kerekes
- Institute of Enzymology, Research Centre for Natural SciencesBudapestHungary
| | - Orsolya Csuka
- Department of Pathogenetics, National Institute of OncologyBudapestHungary
| | - László Patthy
- Institute of Enzymology, Research Centre for Natural SciencesBudapestHungary
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12
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Physicochemical properties of dentinogenesis imperfecta with a known DSPP mutation. Arch Oral Biol 2020; 117:104815. [PMID: 32585446 DOI: 10.1016/j.archoralbio.2020.104815] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Revised: 05/25/2020] [Accepted: 06/07/2020] [Indexed: 01/24/2023]
Abstract
AIM To investigate the chemical and mechanical properties of teeth affected by a 1-bp deletion (c.2688delT) in the DSPP gene. METHODS AND MATERIALS Maxillary first premolars were extracted from the affected individual at age 9 years due to the orthodontic reason for crowding. A sample was imbedded in epoxy resin and sectioned buccolingually, after micro-computerized tomography (μCT) images were taken. Scanning Electron Microscopy (SEM), Energy Dispersive Spectrometry (EDS) and Vickers microhardness testing were also performed. RESULTS μCT reconstruction and analysis showed an irregularly obliterated pulp chamber and an extremely small pulpal volume in the DGI-II sample. The mineral density and microhardness scores were smaller in the dentin of the DGI-II sample compared to the wild-type. Mg content was lower in the dentin of the DGI-II sample compared to the wild-type. CONCLUSION This study shows that dentin affected by a 1-bp deletion in DSPP has a reduced mineral density, diminished microhardness and reduced Mg content.
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Nakanishi J, Suzuki S, Yoshida K, Hirata-Tsuchiya S, Haruyama N, Yamada S, Shiba H. Dentin phosphoprotein inhibits lipopolysaccharide-induced macrophage activation independent of its serine/aspartic acid-rich repeats. Arch Oral Biol 2019; 110:104634. [PMID: 31855746 DOI: 10.1016/j.archoralbio.2019.104634] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2019] [Revised: 11/10/2019] [Accepted: 12/11/2019] [Indexed: 10/25/2022]
Abstract
OBJECTIVE The objective of this study was to investigate the effects of dentin phosphoprotein (DPP) on lipopolysaccharide-induced inflammatory responses of macrophages in vitro. DESIGN Wildtype and mutant recombinant dentin phosphoprotein (rDPP) proteins were generated using a mammalian expression system. Macrophages, phorbol 12-myristate 13-acetate-differentiated THP-1 cells, were stimulated with lipopolysaccharide in the absence or presence of rDPP proteins. After the 24-hr incubation, the inflammatory gene expression levels were examined by quantitative reverse-transcription polymerase chain reaction and the amount of secreted TNF-α protein was evaluated by enzyme-linked immunosorbent assay. Furthermore, the subcellular localization of exogenously added rDPP was examined by immunocytochemistry, and the direct binding of rDPP to lipopolysaccharide was quantified by solid-phase binding assay. RESULTS rDPP dose-dependently reduced the expression of lipopolysaccharide-induced inflammatory genes, such as TNFα, IL-1β, and IL-8, and TNF-α protein secretion from the macrophages. Furthermore, mutant rDPP having a shortened serine/aspartic acid-rich repeats (SDrr) was also able to inhibit lipopolysaccharide-induced inflammatory responses of macrophages. rDPP was localized adjacent to the cellular membrane rather than in the cytoplasm, and rDPP was able to bind to lipopolysaccharide. These results suggested that rDPP inhibited lipopolysaccharide-induced inflammatory responses by binding to lipopolysaccharide. CONCLUSIONS In addition to the well-known functions of DPP for dentin mineralization that depend on the SDrr, we demonstrated that DPP possesses anti-inflammatory effects on lipopolysaccharide-stimulated macrophages that are independent of the SDrr.
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Affiliation(s)
- Jun Nakanishi
- Department of Biological Endodontics, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, 734-8553, Japan
| | - Shigeki Suzuki
- Department of Biological Endodontics, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, 734-8553, Japan; Department of Periodontology and Endodontology, Tohoku University Graduate School of Dentistry, Sendai, 980-8575, Japan.
| | - Kazuma Yoshida
- Department of Biological Endodontics, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, 734-8553, Japan
| | - Shizu Hirata-Tsuchiya
- Department of Biological Endodontics, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, 734-8553, Japan
| | - Naoto Haruyama
- Section of Orthodontics and Dentofacial Orthopedics, Faculty of Dental Science, Kyushu University, Fukuoka, 812-5852, Japan
| | - Satoru Yamada
- Department of Periodontology and Endodontology, Tohoku University Graduate School of Dentistry, Sendai, 980-8575, Japan
| | - Hideki Shiba
- Department of Biological Endodontics, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, 734-8553, Japan
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Lee JW, Hong J, Seymen F, Kim YJ, Kang J, Koruyucu M, Tuloglu N, Bayrak S, Song JS, Shin TJ, Hyun HK, Kim YJ, Lee JC, Park JC, Hu J, Simmer J, Kim JW. Novel frameshift mutations in DSPP cause dentin dysplasia type II. Oral Dis 2019; 25:2044-2046. [PMID: 31454439 DOI: 10.1111/odi.13182] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2019] [Revised: 08/16/2019] [Accepted: 08/20/2019] [Indexed: 12/01/2022]
Affiliation(s)
- Ji Won Lee
- Department of Pediatric Dentistry & Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Korea
| | - Jiwon Hong
- Department of Pediatric Dentistry & Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Korea
| | - Figen Seymen
- Department of Pedodontics, Faculty of Dentistry, Istanbul University, Istanbul, Turkey
| | - Youn Jung Kim
- Department of Molecular Genetics & Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Korea
| | - Jenny Kang
- Department of Pediatric Dentistry & Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Korea
| | - Mine Koruyucu
- Department of Pedodontics, Faculty of Dentistry, Istanbul University, Istanbul, Turkey
| | - Nuray Tuloglu
- Department of Pediatric Dentistry, Faculty of Dentistry, University of Eskisehir Osmangazi, Eskisehir, Turkey
| | - Sule Bayrak
- Department of Pediatric Dentistry, Faculty of Dentistry, University of Eskisehir Osmangazi, Eskisehir, Turkey
| | - Ji-Soo Song
- Department of Pediatric Dentistry & Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Korea
| | - Teo Jeon Shin
- Department of Pediatric Dentistry & Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Korea
| | - Hong-Keun Hyun
- Department of Pediatric Dentistry & Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Korea
| | - Young-Jae Kim
- Department of Pediatric Dentistry & Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Korea
| | | | - Joo-Cheol Park
- Department of Cell and Developmental Biology & Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Korea
| | - Jan Hu
- Department of Biologic and Materials Sciences, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - James Simmer
- Department of Biologic and Materials Sciences, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - Jung-Wook Kim
- Department of Pediatric Dentistry & Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Korea.,Department of Molecular Genetics & Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Korea
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Fan F, Li N, Huang S, Ma J. A multidisciplinary approach to the functional and esthetic rehabilitation of dentinogenesis imperfecta type II: A clinical report. J Prosthet Dent 2019; 122:95-103. [DOI: 10.1016/j.prosdent.2018.10.028] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Revised: 10/26/2018] [Accepted: 10/29/2018] [Indexed: 10/27/2022]
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16
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Yamakoshi Y, Simmer JP. Structural features, processing mechanism and gene splice variants of dentin sialophosphoprotein. JAPANESE DENTAL SCIENCE REVIEW 2018; 54:183-196. [PMID: 30302137 PMCID: PMC6175968 DOI: 10.1016/j.jdsr.2018.03.006] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2017] [Revised: 02/12/2018] [Accepted: 03/22/2018] [Indexed: 12/03/2022] Open
Abstract
Dentin sialophosphoprotein (DSPP) plays an important role in the formation of dentin. Understanding its structure and function would provide important insights into the regulation of dentin mineralization. For the past 15 years, we have been studying DSPP-derived proteins isolated from pig dentin. Porcine DSPP is synthesized and secreted by odontoblasts and processed into three proteins, i.e., dentin sialoprotein (DSP), dentin glycoprotein (DGP), and dentin phosphoprotein (DPP), by bone morphogenetic protein 1 and matrix metalloproteinase-20 and -2. DSP is a proteoglycan that forms covalent dimers, DGP is a phosphorylated glycoprotein, and DPP is a highly phosphorylated intrinsically disordered protein with genetic polymorphisms. Furthermore, DPP is not detected in dental pulp. This is possibly due to the existence of two mRNA variants of the DSPP gene: one that encodes the DSP region alone and another that encodes full-length DSPP. The mRNA variant encoding DSP alone is expressed in dental pulp and odontoblasts, but the variant encoding full-length DSPP is predominantly expressed in odontoblasts and barely in dental pulp.
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Affiliation(s)
- Yasuo Yamakoshi
- Department of Biochemistry and Molecular Biology, School of Dental Medicine, Tsurumi University, 2-1-3 Tsurumi, Tsurumi-ku, Yokohama 230-8501, Japan
| | - James P. Simmer
- Department of Biologic and Materials Sciences, University of Michigan School of Dentistry, 1210 Eisenhower Place, Ann Arbor, 48103, USA
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Lu T, Li M, Xu X, Xiong J, Huang C, Zhang X, Hu A, Peng L, Cai D, Zhang L, Wu B, Xiong F. Whole exome sequencing identifies an AMBN missense mutation causing severe autosomal-dominant amelogenesis imperfecta and dentin disorders. Int J Oral Sci 2018; 10:26. [PMID: 30174330 PMCID: PMC6119682 DOI: 10.1038/s41368-018-0027-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2018] [Revised: 05/15/2018] [Accepted: 05/18/2018] [Indexed: 11/25/2022] Open
Abstract
Tooth development is a complex process that involves precise and time-dependent orchestration of multiple genetic, molecular, and cellular interactions. Ameloblastin (AMBN, also named “amelin” or “sheathlin”) is the second most abundant enamel matrix protein known to have a key role in amelogenesis. Amelogenesis imperfecta (AI [MIM: 104500]) refers to a genetically and phenotypically heterogeneous group of conditions characterized by inherited developmental enamel defects. The hereditary dentin disorders comprise a variety of autosomal-dominant genetic symptoms characterized by abnormal dentin structure affecting either the primary or both the primary and secondary teeth. The vital role of Ambn in amelogenesis has been confirmed experimentally using mouse models. Only two cases have been reported of mutations of AMBN associated with non-syndromic human AI. However, no AMBN missense mutations have been reported to be associated with both human AI and dentin disorders. We recruited one kindred with autosomal-dominant amelogenesis imperfecta (ADAI) and dentinogenesis imperfecta/dysplasia characterized by generalized severe enamel and dentin defects. Whole exome sequencing of the proband identified a novel heterozygous C-T point mutation at nucleotide position 1069 of the AMBN gene, causing a Pro to Ser mutation at the conserved amino acid position 357 of the protein. Exfoliated third molar teeth from the affected family members were found to have enamel and dentin of lower mineral density than control teeth, with thinner and easily fractured enamel, short and thick roots, and pulp obliteration. This study demonstrates, for the first time, that an AMBN missense mutation causes non-syndromic human AI and dentin disorders. A mutation on a gene involved in healthy tooth development may cause both enamel and dentin disorders. The ameloblastin enamel protein, and its associated gene, AMBN, play vital roles in enamel formation and tooth remodelling. Mutations on AMBN can cause amelogenesis imperfecta (AI), a genetic and hereditory condition resulting in enamel defects and severe tooth decay. Now, Fu Xiong and Bu-Ling Wu at Southern Medical University in Guangzhou, China, and co-workers have identified an AMBN mutation found in both enamel and dentin defect disorders. The researchers analyzed extracted teeth from a Chinese patient with both AI and a severe dentin disorder, along with teeth from affected and non-affected members of the same family, and compared the results with a control group. They identified a rare mutation on AMBN common to all affected individuals.
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Affiliation(s)
- Ting Lu
- Department of Stomatology, Nanfang Hospital, College of Stomatology, Southern Medical University, Guangzhou, Guangdong, China.,Department of Medical Genetics, School of Basic Medicine Sciences, Southern Medical University, Guangzhou, Guangdong, China
| | - Meiyi Li
- Department of Medical Genetics, School of Basic Medicine Sciences, Southern Medical University, Guangzhou, Guangdong, China
| | - Xiangmin Xu
- Department of Medical Genetics, School of Basic Medicine Sciences, Southern Medical University, Guangzhou, Guangdong, China.,Guangdong Key Laboratory of Biological Chip, Guangzhou, Guangdong, China
| | - Jun Xiong
- Department of Laboratory Medicine, ZhuJiang Hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Cheng Huang
- Department of Medical Genetics, School of Basic Medicine Sciences, Southern Medical University, Guangzhou, Guangdong, China
| | - Xuelian Zhang
- Department of Medical Genetics, School of Basic Medicine Sciences, Southern Medical University, Guangzhou, Guangdong, China
| | - Aiqin Hu
- Department of Medical Genetics, School of Basic Medicine Sciences, Southern Medical University, Guangzhou, Guangdong, China
| | - Ling Peng
- Department of Stomatology, Nanfang Hospital, College of Stomatology, Southern Medical University, Guangzhou, Guangdong, China
| | - Decheng Cai
- Department of Medical Genetics, School of Basic Medicine Sciences, Southern Medical University, Guangzhou, Guangdong, China
| | - Leitao Zhang
- Department of Stomatology, Nanfang Hospital, College of Stomatology, Southern Medical University, Guangzhou, Guangdong, China
| | - Buling Wu
- Department of Stomatology, Nanfang Hospital, College of Stomatology, Southern Medical University, Guangzhou, Guangdong, China.
| | - Fu Xiong
- Department of Medical Genetics, School of Basic Medicine Sciences, Southern Medical University, Guangzhou, Guangdong, China. .,Guangdong Key Laboratory of Biological Chip, Guangzhou, Guangdong, China.
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18
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Taleb K, Lauridsen E, Daugaard-Jensen J, Nieminen P, Kreiborg S. Dentinogenesis imperfecta type II- genotype and phenotype analyses in three Danish families. Mol Genet Genomic Med 2018; 6:339-349. [PMID: 29512331 PMCID: PMC6014476 DOI: 10.1002/mgg3.375] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2017] [Revised: 01/02/2018] [Accepted: 01/20/2018] [Indexed: 01/18/2023] Open
Abstract
BACKGROUND Dentinogenesis imperfecta (DI) is a rare debilitating hereditary disorder affecting dentin formation and causing loss of the overlying enamel. Clinically, DI sufferers have a discolored and weakened dentition with an increased risk of fracture. The aims of this study were to assess genotype-phenotype findings in three families with DI-II with special reference to mutations in the DSPP gene and clinical, histological, and imaging manifestations. METHODS Nine patients participated in the study (two from family A, four from family B, and three from family C). Buccal swab samples were collected from all participants and extracted for genomic DNA. Clinical and radiographic examinations had been performed longitudinally, and the dental status was documented using photographic images. Four extracted and decalcified tooth samples were prepared for histological analysis to assess dysplastic manifestations in the dentin. Optical coherence tomography (OCT) was applied to study the health of enamel tissue from in vivo images and the effect of the mutation on the function and structure of the DSPP gene was analyzed using bioinformatics software programs. RESULTS The direct DNA sequence analysis revealed three distinct mutations, one of which was a novel finding. The mutations caused dominant phenotypes presumably by interference with signal peptide processing and protein secretion. The clinical and radiographic disturbances in the permanent dentition indicated interfamilial variability in DI-II manifestations, however, no significant intrafamilial variability was observed. CONCLUSION The different mutations in the DSPP gene were accompanied by distinct phenotypes. Enamel defects suggested deficit in preameloblast function during the early stages of amelogenesis.
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Affiliation(s)
- Kawther Taleb
- Department of Odontology, Pediatric Dentistry and Clinical Genetics, Faculty of Health and Medical Sciences, University of Copenhagen, Denmark.,Resource Centre for Rare Oral Diseases, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
| | - Eva Lauridsen
- Resource Centre for Rare Oral Diseases, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
| | - Jette Daugaard-Jensen
- Resource Centre for Rare Oral Diseases, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
| | - Pekka Nieminen
- Department of Oral and Maxillofacial Diseases, Clinicum, University of Helsinki, Helsinki, Finland
| | - Sven Kreiborg
- Department of Odontology, Pediatric Dentistry and Clinical Genetics, Faculty of Health and Medical Sciences, University of Copenhagen, Denmark.,Resource Centre for Rare Oral Diseases, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
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Neanderthal and Denisova tooth protein variants in present-day humans. PLoS One 2017; 12:e0183802. [PMID: 28902892 PMCID: PMC5597096 DOI: 10.1371/journal.pone.0183802] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2017] [Accepted: 08/13/2017] [Indexed: 12/15/2022] Open
Abstract
Environment parameters, diet and genetic factors interact to shape tooth morphostructure. In the human lineage, archaic and modern hominins show differences in dental traits, including enamel thickness, but variability also exists among living populations. Several polymorphisms, in particular in the non-collagenous extracellular matrix proteins of the tooth hard tissues, like enamelin, are involved in dental structure variation and defects and may be associated with dental disorders or susceptibility to caries. To gain insights into the relationships between tooth protein polymorphisms and dental structural morphology and defects, we searched for non-synonymous polymorphisms in tooth proteins from Neanderthal and Denisova hominins. The objective was to identify archaic-specific missense variants that may explain the dental morphostructural variability between extinct and modern humans, and to explore their putative impact on present-day dental phenotypes. Thirteen non-collagenous extracellular matrix proteins specific to hard dental tissues have been selected, searched in the publicly available sequence databases of Neanderthal and Denisova individuals and compared with modern human genome data. A total of 16 non-synonymous polymorphisms were identified in 6 proteins (ameloblastin, amelotin, cementum protein 1, dentin matrix acidic phosphoprotein 1, enamelin and matrix Gla protein). Most of them are encoded by dentin and enamel genes located on chromosome 4, previously reported to show signs of archaic introgression within Africa. Among the variants shared with modern humans, two are ancestral (common with apes) and one is the derived enamelin major variant, T648I (rs7671281), associated with a thinner enamel and specific to the Homo lineage. All the others are specific to Neanderthals and Denisova, and are found at a very low frequency in modern Africans or East and South Asians, suggesting that they may be related to particular dental traits or disease susceptibility in these populations. This modern regional distribution of archaic dental polymorphisms may reflect persistence of archaic variants in some populations and may contribute in part to the geographic dental variations described in modern humans.
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20
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Hong J, Shin TJ, Hyun HK, Kim YJ, Lee SH, Kim JW. A Frameshift Mutation causes Dentinogenesis Imperfecta Type II. ACTA ACUST UNITED AC 2017. [DOI: 10.5933/jkapd.2017.44.2.164] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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21
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Syriac G, Joseph E, Rupesh S, Mathew J. Complete Overlay Denture for Pedodontic Patient with Severe Dentinogenesis Imperfecta. Int J Clin Pediatr Dent 2017; 10:394-398. [PMID: 29403236 PMCID: PMC5789146 DOI: 10.5005/jp-journals-10005-1472] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Accepted: 10/28/2017] [Indexed: 11/23/2022] Open
Abstract
Dentinogenesis imperfecta (DI) is a hereditary condition that may affect both primary and permanent dentition and is characterized by abnormal dentin formation. The teeth may be discolored with chipping of enamel and, in untreated cases, the entire dentition may wear off to the gingiva. This may lead to the formation of abscesses, tooth mobility, and early loss of teeth. In the Indian population, DI is found to have an incidence of 0.09%. Treatment of DI should aim to remove infection, if any, from the oral cavity; restore form, function, and esthetics; and protect posterior teeth from wear for maintaining the occlusal vertical dimension. Treatment strategies should be selected based on the presenting complaint of the patient, patient's age, and severity of the problem. This case report presents the management of severe DI with tooth worn off until gingival level in a very young patient using complete overlay denture, which has not been reported earlier. How to cite this article: Syriac G, Joseph E, Rupesh S, Mathew J. Complete Overlay Denture for Pedodontic Patient with Severe Dentinogenesis Imperfecta. Int J Clin Pediatr Dent 2017;10(4):394-398.
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Affiliation(s)
- Gibi Syriac
- Reader,Department of Pedodontics, Pushpagiri College of Dental Sciences, Tiruvalla, Kerala, India
| | - Elizabeth Joseph
- Professor and Head, Department of Pedodontics, Pushpagiri College of Dental Sciences, Tiruvalla, Kerala, India
| | - Suresh Rupesh
- Associate Professor, Department of Pedodontics, Pushpagiri College of Dental Sciences, Tiruvalla, Kerala, India
| | - Josey Mathew
- Professor, Department of Conservative Dentistry and Endodontics Pushpagiri College of Dental Sciences, Tiruvalla, Kerala, India
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Li F, Liu Y, Liu H, Yang J, Zhang F, Feng H. Phenotype and genotype analyses in seven families with dentinogenesis imperfecta or dentin dysplasia. Oral Dis 2017; 23:360-366. [PMID: 27973701 DOI: 10.1111/odi.12621] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2016] [Revised: 11/29/2016] [Accepted: 12/05/2016] [Indexed: 01/15/2023]
Abstract
OBJECTIVE Hereditary dentin defects can be categorised into two classes according to their clinical manifestations: dentinogenesis imperfecta (DGI), which includes three types (DGI-I, DGI-II and DGI-III), and dentin dysplasia (DD), which includes two types (DD-I and DD-II). This study investigated the phenotypic characteristics and genetic causes of hereditary dentin defects in seven Chinese families. MATERIALS AND METHODS Seven families affected with DGI-II, DGI-III or DD-II were enrolled. Clinical examinations were performed to determine the phenotypic characteristics, and DNA samples were collected for Sanger sequencing. RESULTS Clinical diagnoses revealed DGI-II in five families, DGI-III in one family and DD-II in one family. Variants of the dentin sialophosphoprotein (DSPP) gene were found in six of the seven families. Of these, c.52G>T was identified in two families. Each of the remaining four families had a different variant: c.2684delG, c.52-2A>G, c.1874-1877delACAG and c.3509-3521del13bp; the last three variants were novel. CONCLUSIONS This is the first study to analyse all three important types of hereditary dentin defect and include comprehensive genetic analyses of both dentin sialoprotein and dentin phosphoprotein in Chinese families. This study expands the spectrum of DSPP variants, highlighting their associated phenotypic continuum.
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Affiliation(s)
- F Li
- Department of Prosthodontics, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Peking University School and Hospital of Stomatology, Beijing, China
| | - Y Liu
- Department of Prosthodontics, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Peking University School and Hospital of Stomatology, Beijing, China
| | - H Liu
- Department of Prosthodontics, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Peking University School and Hospital of Stomatology, Beijing, China
| | - J Yang
- Department of Prosthodontics, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Peking University School and Hospital of Stomatology, Beijing, China
| | - F Zhang
- Department of Pediatrics, Peking University School and Hospital of Stomatology, Beijing, China
| | - H Feng
- Department of Prosthodontics, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Peking University School and Hospital of Stomatology, Beijing, China
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23
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Qari H, Kessler H, Narayana N, Premaraj S. Symmetric multiquadrant isolated dentin dysplasia (SMIDD), a unique presentation mimicking dentin dysplasia type 1b. Oral Surg Oral Med Oral Pathol Oral Radiol 2016; 123:e164-e169. [PMID: 28215628 DOI: 10.1016/j.oooo.2016.11.024] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Revised: 11/18/2016] [Accepted: 11/29/2016] [Indexed: 10/20/2022]
Abstract
Dentin dysplasia (DD) is a rare developmental dentin disorder that causes root malformation. It is divided into radicular DD type 1 (DD-1) and coronal DD type 2 (DD-2). Recently, a new entity causing localized root malformation of permanent first molars that resembles DD-1b has been described as molar-incisor malformation (MIM). We report and compare 4 new cases that exhibit similar clinical, histologic, and radiographic features to the new entity, MIM. We believe MIM and our 4 cases to be the same entity, which is nonhereditary and, because of the isolated but bilaterally symmetric pattern of involvement, may be caused by a short-duration environmental insult that disrupts normal development/function of Hertwig's epithelial root sheath. We propose the name symmetrical multiquadrant isolated dentin dysplasia as the most appropriate descriptive designation for this unusual but highly distinctive anomaly.
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Affiliation(s)
- Hiba Qari
- Texas A&M University College of Dentistry, Dallas, TX, USA.
| | - Harvey Kessler
- Texas A&M University College of Dentistry, Dallas, TX, USA
| | - Nagamani Narayana
- University of Nebraska Medical Center College of Dentistry, Lincoln, NE, USA
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Dentin sialophosphoprotein is a potentially latent bioactive protein in dentin. J Oral Biosci 2016; 58:134-142. [DOI: 10.1016/j.job.2016.08.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Accepted: 08/01/2016] [Indexed: 11/18/2022]
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25
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Wan C, Yuan G, Luo D, Zhang L, Lin H, Liu H, Chen L, Yang G, Chen S, Chen Z. The Dentin Sialoprotein (DSP) Domain Regulates Dental Mesenchymal Cell Differentiation through a Novel Surface Receptor. Sci Rep 2016; 6:29666. [PMID: 27430624 PMCID: PMC4949421 DOI: 10.1038/srep29666] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Accepted: 05/18/2016] [Indexed: 01/22/2023] Open
Abstract
Dentin sialophosphoprotein (DSPP) is a dentin extracellular matrix protein that is processed into dentin sialoprotein (DSP), dentin glycoprotein (DGP) and dentin phosphoprotein (DPP). DSP is mainly expressed in odontoblasts. We hypothesized that DSP interacts with cell surface receptors and subsequently activates intracellular signaling. Using DSP as bait for screening a protein library, we demonstrate that DSP acts as a ligand and binds to integrin β6. The 36 amino acid residues of DSP are sufficient to bind to integrin β6. This peptide promoted cell attachment, migration, differentiation and mineralization of dental mesenchymal cells. In addition, DSP (aa183-219) stimulated phosphorylation of ERK1/2 and P38 kinases. This activation was inhibited by an anti-integrin β6 antibody and siRNA. Furthermore, we demonstrate that this DSP fragment induces SMAD1/5/8 phosphorylation and nuclear translocation via ERK1/2 and P38 signaling. SMAD1/5/8 binds to SMAD binding elements (SBEs) in the DSPP gene promoter. SBE mutations result in a decrease in DSPP transcriptional activity. Endogenous DSPP expression was up-regulated by DSP (aa183-219) in dental mesenchymal cells. The data in the current study demonstrate for the first time that this DSP domain acts as a ligand in a RGD-independent manner and is involved in intracellular signaling via interacting with integrin β6. The DSP domain regulates DSPP expression and odontoblast homeostasis via a positive feedback loop.
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Affiliation(s)
- Chunyan Wan
- State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory for Oral Biomedicine of Ministry of Education (KLOBM), School and Hospital of Stomatology, Wuhan University, Wuhan, 430079, China.,Department of Developmental Dentistry, University of Texas Health Science Center, San Antonio, Texas, 78229-3700, United States
| | - Guohua Yuan
- State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory for Oral Biomedicine of Ministry of Education (KLOBM), School and Hospital of Stomatology, Wuhan University, Wuhan, 430079, China
| | - Daoshu Luo
- Department of Developmental Dentistry, University of Texas Health Science Center, San Antonio, Texas, 78229-3700, United States.,Department of Anatomy, Histology and Embryology, School of Basic Medical sciences, Fujian Medical University, Fuzhou, 350108, China
| | - Lu Zhang
- State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory for Oral Biomedicine of Ministry of Education (KLOBM), School and Hospital of Stomatology, Wuhan University, Wuhan, 430079, China
| | - Heng Lin
- State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory for Oral Biomedicine of Ministry of Education (KLOBM), School and Hospital of Stomatology, Wuhan University, Wuhan, 430079, China
| | - Huan Liu
- State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory for Oral Biomedicine of Ministry of Education (KLOBM), School and Hospital of Stomatology, Wuhan University, Wuhan, 430079, China
| | - Lei Chen
- Department of Developmental Dentistry, University of Texas Health Science Center, San Antonio, Texas, 78229-3700, United States.,Department of Surgery, The First Affiliated Hospital, Fujian Medial University, Fuzhou, 350005, China
| | - Guobin Yang
- State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory for Oral Biomedicine of Ministry of Education (KLOBM), School and Hospital of Stomatology, Wuhan University, Wuhan, 430079, China
| | - Shuo Chen
- Department of Developmental Dentistry, University of Texas Health Science Center, San Antonio, Texas, 78229-3700, United States
| | - Zhi Chen
- State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory for Oral Biomedicine of Ministry of Education (KLOBM), School and Hospital of Stomatology, Wuhan University, Wuhan, 430079, China
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26
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Bloch-Zupan A, Huckert M, Stoetzel C, Meyer J, Geoffroy V, Razafindrakoto RW, Ralison SN, Randrianaivo JC, Ralison G, Andriamasinoro RO, Ramanampamaharana RH, Randrianazary SE, Richard B, Gorry P, Manière MC, Rakoto Alson S, Dollfus H. Detection of a Novel DSPP Mutation by NGS in a Population Isolate in Madagascar. Front Physiol 2016; 7:70. [PMID: 26973538 PMCID: PMC4773637 DOI: 10.3389/fphys.2016.00070] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2015] [Accepted: 02/12/2016] [Indexed: 12/03/2022] Open
Abstract
A large family from a small village in Madagascar, Antanetilava, is known to present with colored teeth. Through previous collaboration and 4 successive visits in 1994, 2004, 2005, and 2012, we provided dental care to the inhabitants and diagnosed dentinogenesis imperfecta. Recently, using whole exome sequencing we confirmed the clinical diagnosis by identifying a novel single nucleotide deletion in exon 5 of DSPP. This paper underlines the necessity of long run research, the importance of international and interpersonal collaborations as well as the major contribution of next generation sequencing tools in the genetic diagnosis of rare oro-dental anomalies. This study is registered in ClinicalTrials (https://clinicaltrials.gov) under the number NCT02397824.
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Affiliation(s)
- Agnès Bloch-Zupan
- Faculté de Chirurgie Dentaire, Université de StrasbourgStrasbourg, France; Centre de Référence des Manifestations Odontologiques des Maladies Rares, Hôpitaux Universitaires de Strasbourg, Pôle de Médecine et Chirurgie Bucco-dentaires Hôpital CivilStrasbourg, France; Centre National de la Recherche Scientifique-UMR7104, Institut de Génétique et de Biologie Moléculaire et Cellulaire, Institut National de la Santé et de la Recherche Médicale U 964, Université de StrasbourgIllkirch, France
| | - Mathilde Huckert
- Faculté de Chirurgie Dentaire, Université de StrasbourgStrasbourg, France; Laboratoire de Génétique Médicale, Faculté de Médecine, Institut National de la Santé et de la Recherche Médicale U 1112, Université de StrasbourgStrasbourg, France
| | - Corinne Stoetzel
- Laboratoire de Génétique Médicale, Faculté de Médecine, Institut National de la Santé et de la Recherche Médicale U 1112, Université de Strasbourg Strasbourg, France
| | - Julia Meyer
- Faculté de Chirurgie Dentaire, Université de Strasbourg Strasbourg, France
| | - Véronique Geoffroy
- Laboratoire de Génétique Médicale, Faculté de Médecine, Institut National de la Santé et de la Recherche Médicale U 1112, Université de Strasbourg Strasbourg, France
| | - Rabisoa W Razafindrakoto
- Institut d'Odonto-Stomatologie Tropicale de Madagascar, Université de Mahajanga Mahajanga, Madagascar
| | - Saholy N Ralison
- Institut d'Odonto-Stomatologie Tropicale de Madagascar, Université de Mahajanga Mahajanga, Madagascar
| | - Jean-Claude Randrianaivo
- Institut d'Odonto-Stomatologie Tropicale de Madagascar, Université de Mahajanga Mahajanga, Madagascar
| | - Georgette Ralison
- Institut d'Odonto-Stomatologie Tropicale de Madagascar, Université de Mahajanga Mahajanga, Madagascar
| | - Rija O Andriamasinoro
- Institut d'Odonto-Stomatologie Tropicale de Madagascar, Université de Mahajanga Mahajanga, Madagascar
| | - Rija H Ramanampamaharana
- Institut d'Odonto-Stomatologie Tropicale de Madagascar, Université de Mahajanga Mahajanga, Madagascar
| | | | | | - Philippe Gorry
- Research Unit of Theoretical & Applied Economics, GREThA (UMR Centre National de la Recherche Scientifique 5113), Université de Bordeaux Pessac, France
| | - Marie-Cécile Manière
- Faculté de Chirurgie Dentaire, Université de StrasbourgStrasbourg, France; Centre de Référence des Manifestations Odontologiques des Maladies Rares, Hôpitaux Universitaires de Strasbourg, Pôle de Médecine et Chirurgie Bucco-dentaires Hôpital CivilStrasbourg, France
| | - Simone Rakoto Alson
- Institut d'Odonto-Stomatologie Tropicale de Madagascar, Université de Mahajanga Mahajanga, Madagascar
| | - Hélène Dollfus
- Laboratoire de Génétique Médicale, Faculté de Médecine, Institut National de la Santé et de la Recherche Médicale U 1112, Université de Strasbourg Strasbourg, France
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27
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Prasad MK, Geoffroy V, Vicaire S, Jost B, Dumas M, Le Gras S, Switala M, Gasse B, Laugel-Haushalter V, Paschaki M, Leheup B, Droz D, Dalstein A, Loing A, Grollemund B, Muller-Bolla M, Lopez-Cazaux S, Minoux M, Jung S, Obry F, Vogt V, Davideau JL, Davit-Beal T, Kaiser AS, Moog U, Richard B, Morrier JJ, Duprez JP, Odent S, Bailleul-Forestier I, Rousset MM, Merametdijan L, Toutain A, Joseph C, Giuliano F, Dahlet JC, Courval A, El Alloussi M, Laouina S, Soskin S, Guffon N, Dieux A, Doray B, Feierabend S, Ginglinger E, Fournier B, de la Dure Molla M, Alembik Y, Tardieu C, Clauss F, Berdal A, Stoetzel C, Manière MC, Dollfus H, Bloch-Zupan A. A targeted next-generation sequencing assay for the molecular diagnosis of genetic disorders with orodental involvement. J Med Genet 2016; 53:98-110. [PMID: 26502894 PMCID: PMC4752661 DOI: 10.1136/jmedgenet-2015-103302] [Citation(s) in RCA: 88] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2015] [Revised: 09/08/2015] [Accepted: 09/24/2015] [Indexed: 11/23/2022]
Abstract
BACKGROUND Orodental diseases include several clinically and genetically heterogeneous disorders that can present in isolation or as part of a genetic syndrome. Due to the vast number of genes implicated in these disorders, establishing a molecular diagnosis can be challenging. We aimed to develop a targeted next-generation sequencing (NGS) assay to diagnose mutations and potentially identify novel genes mutated in this group of disorders. METHODS We designed an NGS gene panel that targets 585 known and candidate genes in orodental disease. We screened a cohort of 101 unrelated patients without a molecular diagnosis referred to the Reference Centre for Oro-Dental Manifestations of Rare Diseases, Strasbourg, France, for a variety of orodental disorders including isolated and syndromic amelogenesis imperfecta (AI), isolated and syndromic selective tooth agenesis (STHAG), isolated and syndromic dentinogenesis imperfecta, isolated dentin dysplasia, otodental dysplasia and primary failure of tooth eruption. RESULTS We discovered 21 novel pathogenic variants and identified the causative mutation in 39 unrelated patients in known genes (overall diagnostic rate: 39%). Among the largest subcohorts of patients with isolated AI (50 unrelated patients) and isolated STHAG (21 unrelated patients), we had a definitive diagnosis in 14 (27%) and 15 cases (71%), respectively. Surprisingly, COL17A1 mutations accounted for the majority of autosomal-dominant AI cases. CONCLUSIONS We have developed a novel targeted NGS assay for the efficient molecular diagnosis of a wide variety of orodental diseases. Furthermore, our panel will contribute to better understanding the contribution of these genes to orodental disease. TRIAL REGISTRATION NUMBERS NCT01746121 and NCT02397824.
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Affiliation(s)
- Megana K Prasad
- Laboratoire de Génétique Médicale, INSERMU1112, Institut de génétique médicale d'Alsace, FMTS, Université de Strasbourg, Strasbourg, France
| | - Véronique Geoffroy
- Laboratoire de Génétique Médicale, INSERMU1112, Institut de génétique médicale d'Alsace, FMTS, Université de Strasbourg, Strasbourg, France
| | - Serge Vicaire
- Plateforme de Biopuces et Séquençage, Institut de Génétique et de Biologie Moléculaire and Cellulaire-Centre Européen de Recherche en Biologie et en Médecine, CNRS UMR7104, INSERM U964, Université de Strasbourg, Illkirch, France
| | - Bernard Jost
- Plateforme de Biopuces et Séquençage, Institut de Génétique et de Biologie Moléculaire and Cellulaire-Centre Européen de Recherche en Biologie et en Médecine, CNRS UMR7104, INSERM U964, Université de Strasbourg, Illkirch, France
| | - Michael Dumas
- Plateforme de Biopuces et Séquençage, Institut de Génétique et de Biologie Moléculaire and Cellulaire-Centre Européen de Recherche en Biologie et en Médecine, CNRS UMR7104, INSERM U964, Université de Strasbourg, Illkirch, France
| | - Stéphanie Le Gras
- Plateforme de Biopuces et Séquençage, Institut de Génétique et de Biologie Moléculaire and Cellulaire-Centre Européen de Recherche en Biologie et en Médecine, CNRS UMR7104, INSERM U964, Université de Strasbourg, Illkirch, France
| | - Marzena Switala
- Centre de Référence des Manifestations Odontologiques des Maladies Rares, Pôle de Médecine et Chirurgie Bucco-dentaires, Hôpitaux Universitaires de Strasbourg (HUS), Strasbourg, France
- Faculté de Chirurgie Dentaire, Université de Strasbourg, Strasbourg, France
| | - Barbara Gasse
- Evolution et Développement du Squelette-EDS, UMR7138-SAE, Université Pierre et Marie Curie, Paris, France
| | - Virginie Laugel-Haushalter
- Institut de Génétique et de Biologie Moléculaire and Cellulaire-Centre Européen de Recherche en Biologie et en Médecine, CNRS UMR7104, INSERM U964 Université de Strasbourg, Illkirch, France
| | - Marie Paschaki
- Laboratoire de Génétique Médicale, INSERMU1112, Institut de génétique médicale d'Alsace, FMTS, Université de Strasbourg, Strasbourg, France
- Institut de Génétique et de Biologie Moléculaire and Cellulaire-Centre Européen de Recherche en Biologie et en Médecine, CNRS UMR7104, INSERM U964 Université de Strasbourg, Illkirch, France
| | - Bruno Leheup
- Faculté de Médecine, CHU de Nancy, Université de Lorraine, Vandoeuvre-Les-Nancy, France
| | | | | | - Adeline Loing
- Centre de Référence des Manifestations Odontologiques des Maladies Rares, Pôle de Médecine et Chirurgie Bucco-dentaires, Hôpitaux Universitaires de Strasbourg (HUS), Strasbourg, France
| | - Bruno Grollemund
- Faculté de Chirurgie Dentaire, Université de Strasbourg, Strasbourg, France
| | - Michèle Muller-Bolla
- Départment d'Odontologie Pédiatrique, UFR d'Odontologie, Université de Nice Sophia-Antipolis, CHU de Nice, Nice, France
- URB2i—EA 4462, Paris Descartes, Paris, France
| | - Séréna Lopez-Cazaux
- Faculté de Chirurgie Dentaire, Département d'Odontologie Pédiatrique, CHU Hotel Dieu, Service d'odontologie conservatrice et pédiatrique, Nantes, France
| | - Maryline Minoux
- Centre de Référence des Manifestations Odontologiques des Maladies Rares, Pôle de Médecine et Chirurgie Bucco-dentaires, Hôpitaux Universitaires de Strasbourg (HUS), Strasbourg, France
- Faculté de Chirurgie Dentaire, Université de Strasbourg, Strasbourg, France
| | - Sophie Jung
- Centre de Référence des Manifestations Odontologiques des Maladies Rares, Pôle de Médecine et Chirurgie Bucco-dentaires, Hôpitaux Universitaires de Strasbourg (HUS), Strasbourg, France
- Faculté de Chirurgie Dentaire, Université de Strasbourg, Strasbourg, France
| | - Frédéric Obry
- Centre de Référence des Manifestations Odontologiques des Maladies Rares, Pôle de Médecine et Chirurgie Bucco-dentaires, Hôpitaux Universitaires de Strasbourg (HUS), Strasbourg, France
- Faculté de Chirurgie Dentaire, Université de Strasbourg, Strasbourg, France
| | - Vincent Vogt
- Centre de Référence des Manifestations Odontologiques des Maladies Rares, Pôle de Médecine et Chirurgie Bucco-dentaires, Hôpitaux Universitaires de Strasbourg (HUS), Strasbourg, France
- Faculté de Chirurgie Dentaire, Université de Strasbourg, Strasbourg, France
| | - Jean-Luc Davideau
- Faculté de Chirurgie Dentaire, Université de Strasbourg, Strasbourg, France
| | - Tiphaine Davit-Beal
- Evolution et Développement du Squelette-EDS, UMR7138-SAE, Université Pierre et Marie Curie, Paris, France
- Faculté de Chirurgie Dentaire, Département d'Odontologie Pédiatrique, Université Paris Descartes, Montrouge, France
| | | | - Ute Moog
- Institute of Human Genetics, Heidelberg University, Heidelberg, Germany
| | - Béatrice Richard
- Service de Consultations et Traitements Dentaires, Hospices Civils de Lyon, Faculté d'Odontologie, Université Claude Bernard Lyon1, Lyon, France
| | - Jean-Jacques Morrier
- Service de Consultations et Traitements Dentaires, Hospices Civils de Lyon, Faculté d'Odontologie, Université Claude Bernard Lyon1, Lyon, France
| | - Jean-Pierre Duprez
- Service de Consultations et Traitements Dentaires, Hospices Civils de Lyon, Faculté d'Odontologie, Université Claude Bernard Lyon1, Lyon, France
| | - Sylvie Odent
- Service de Génétique Clinique, CHU de Rennes, Rennes, France
| | - Isabelle Bailleul-Forestier
- Faculté de Chirurgie Dentaire, CHU de Toulouse, Odontologie Pédiatrique, Université Paul Sabatier, Toulouse, France
| | - Monique Marie Rousset
- Unité Fonctionnelle d'Odontologie pédiatrique, Service d'odontologie, CHRU de Lille, Lille, France
| | - Laure Merametdijan
- Faculté de Chirurgie Dentaire, Service d'Odontologie Conservatrice et Endodontie, CHU Nantes, Université de Nantes, France
| | | | - Clara Joseph
- Départment d'Odontologie Pédiatrique, Université de Nice Sophia-Antipolis, CHU Nice, Nice, France
| | | | - Jean-Christophe Dahlet
- Centre de Référence des Manifestations Odontologiques des Maladies Rares, Pôle de Médecine et Chirurgie Bucco-dentaires, Hôpitaux Universitaires de Strasbourg (HUS), Strasbourg, France
| | - Aymeric Courval
- Pôle de Médecine et de Chirurgie Bucco-dentaire, Hôpital Civil, HUS, Strasbourg, France
| | - Mustapha El Alloussi
- Faculty of Dental Medicine, Department of Pediatric Dentistry, University Mohammed V Rabat, Morocco
| | - Samir Laouina
- Faculty of Dental Medicine, Department of Pediatric Dentistry, University Mohammed V Rabat, Morocco
| | - Sylvie Soskin
- Pédiatrie 1, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | | | - Anne Dieux
- Service de génétique clinique Guy Fontaine, Centre Hospitalier Régionale Universitaire (CHRU) de Lille, Lille, France
| | - Bérénice Doray
- Service de Génétique Médicale, CHU de Strasbourg, Strasbourg, France
| | - Stephanie Feierabend
- Klinik für Zahnerhaltungskunde und Parodontologie, Universitats Klinikum, Freiburg, Germany
| | | | - Benjamin Fournier
- Laboratoire de Physiopathologie Orale Moléculaire INSERM UMR S1138, Centre de Recherche des Cordeliers, Universités Paris-Diderot et Paris-Descartes, Paris, France
- Centre de Référence des Malformations Rares de la Face et de la Cavité Buccale MAFACE, Hôpital Rothschild, Pôle d'Odontologie, Paris, France
| | - Muriel de la Dure Molla
- Laboratoire de Physiopathologie Orale Moléculaire INSERM UMR S1138, Centre de Recherche des Cordeliers, Universités Paris-Diderot et Paris-Descartes, Paris, France
- Centre de Référence des Malformations Rares de la Face et de la Cavité Buccale MAFACE, Hôpital Rothschild, Pôle d'Odontologie, Paris, France
| | - Yves Alembik
- Service de Génétique Médicale, CHU de Strasbourg, Strasbourg, France
| | - Corinne Tardieu
- Aix-Marseille Université, UMR 7268 ADES/EFS/CNRS, APHM, Hôpital Timone, Service Odontologie, Marseille, France
| | - François Clauss
- Centre de Référence des Manifestations Odontologiques des Maladies Rares, Pôle de Médecine et Chirurgie Bucco-dentaires, Hôpitaux Universitaires de Strasbourg (HUS), Strasbourg, France
- Faculté de Chirurgie Dentaire, Université de Strasbourg, Strasbourg, France
| | - Ariane Berdal
- Laboratoire de Physiopathologie Orale Moléculaire INSERM UMR S1138, Centre de Recherche des Cordeliers, Universités Paris-Diderot et Paris-Descartes, Paris, France
- Centre de Référence des Malformations Rares de la Face et de la Cavité Buccale MAFACE, Hôpital Rothschild, Pôle d'Odontologie, Paris, France
| | - Corinne Stoetzel
- Laboratoire de Génétique Médicale, INSERMU1112, Institut de génétique médicale d'Alsace, FMTS, Université de Strasbourg, Strasbourg, France
| | - Marie Cécile Manière
- Centre de Référence des Manifestations Odontologiques des Maladies Rares, Pôle de Médecine et Chirurgie Bucco-dentaires, Hôpitaux Universitaires de Strasbourg (HUS), Strasbourg, France
- Faculté de Chirurgie Dentaire, Université de Strasbourg, Strasbourg, France
| | - Hélène Dollfus
- Laboratoire de Génétique Médicale, INSERMU1112, Institut de génétique médicale d'Alsace, FMTS, Université de Strasbourg, Strasbourg, France
- Service de Génétique Médicale, Centre de Référence pour les Affections Rares en Génétique Ophtalmologique, HUS, Strasbourg, France
| | - Agnès Bloch-Zupan
- Centre de Référence des Manifestations Odontologiques des Maladies Rares, Pôle de Médecine et Chirurgie Bucco-dentaires, Hôpitaux Universitaires de Strasbourg (HUS), Strasbourg, France
- Faculté de Chirurgie Dentaire, Université de Strasbourg, Strasbourg, France
- Institut de Génétique et de Biologie Moléculaire and Cellulaire-Centre Européen de Recherche en Biologie et en Médecine, CNRS UMR7104, INSERM U964 Université de Strasbourg, Illkirch, France
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Yang J, Kawasaki K, Lee M, Reid BM, Nunez SM, Choi M, Seymen F, Koruyucu M, Kasimoglu Y, Estrella-Yuson N, Lin BPJ, Simmer JP, Hu JCC. The dentin phosphoprotein repeat region and inherited defects of dentin. Mol Genet Genomic Med 2016; 4:28-38. [PMID: 26788535 PMCID: PMC4707025 DOI: 10.1002/mgg3.176] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2015] [Revised: 08/05/2015] [Accepted: 08/06/2015] [Indexed: 11/12/2022] Open
Abstract
Nonsyndromic dentin defects classified as type II dentin dysplasia and types II and III dentinogenesis imperfecta are caused by mutations in DSPP (dentin sialophosphoprotein). Most reported disease‐causing DSPP mutations occur within the repetitive DPP (dentin phosphoprotein) coding sequence. We characterized the DPP sequences of five probands with inherited dentin defects using single molecule real‐time (SMRT) DNA sequencing. Eight of the 10 sequences matched previously reported DPP length haplotypes and two were novel. Alignment with known DPP sequences showed 32 indels arranged in 36 different patterns. Sixteen of the 32 indels were not represented in more than one haplotype. The 25 haplotypes with confirmed indels were aligned to generate a tree that describes how the length variations might have evolved. Some indels were independently generated in multiple lines. A previously reported disease‐causing DSPP mutation in Family 1 was confirmed and its position clarified (c.3135delC; p.Ser1045Argfs*269). A novel frameshift mutation (c.3504_3508dup; p.Asp1170Alafs*146) caused the dentin defects in Family 2. A COL1A2 (c.2027G>A or p.Gly676Asp) missense mutation, discovered by whole‐exome sequencing, caused the dentin defects in Family 3. We conclude that SMRT sequencing characterizes the DPP repeat region without cloning and can improve our understanding of normal and pathological length variations in DSPP alleles.
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Affiliation(s)
- Jie Yang
- Department of Biologic and Materials SciencesUniversity of Michigan School of Dentistry1210 Eisenhower PlaceAnn ArborMichigan; Department of Pediatric DentistrySchool and Hospital of StomatologyPeking University22 South AvenueZhongguancun Haidian DistrictBeijing100081China
| | - Kazuhiko Kawasaki
- Department of Anthropology Pennsylvania State University University Park Pennsylvania 16802
| | - Moses Lee
- Department of Biomedical Sciences Seoul National University College of Medicine 275-1 Yongon-dong, Chongno-gu Seoul 110-768 Korea
| | - Bryan M Reid
- Department of Biologic and Materials Sciences University of Michigan School of Dentistry 1210 Eisenhower Place Ann Arbor Michigan
| | - Stephanie M Nunez
- Department of Biologic and Materials Sciences University of Michigan School of Dentistry 1210 Eisenhower Place Ann Arbor Michigan
| | - Murim Choi
- Department of Biomedical Sciences Seoul National University College of Medicine 275-1 Yongon-dong, Chongno-gu Seoul 110-768 Korea
| | - Figen Seymen
- Department of Pedodontics Faculty of Dentistry Istanbul University Istanbul Turkey
| | - Mine Koruyucu
- Department of Pedodontics Faculty of Dentistry Istanbul University Istanbul Turkey
| | - Yelda Kasimoglu
- Department of Pedodontics Faculty of Dentistry Istanbul University Istanbul Turkey
| | - Ninna Estrella-Yuson
- Department of Paediatric Dentistry Women's and Children's Hospital 72 King William Road North Adelaide South Australia 5006 Australia
| | - Brent P J Lin
- Department of Pediatric Dentistry School of Dentistry University of California San Francisco California
| | - James P Simmer
- Department of Biologic and Materials Sciences University of Michigan School of Dentistry 1210 Eisenhower Place Ann Arbor Michigan
| | - Jan C-C Hu
- Department of Biologic and Materials Sciences University of Michigan School of Dentistry 1210 Eisenhower Place Ann Arbor Michigan
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Liang T, Meng T, Wang S, Qin C, Lu Y. The LPV Motif Is Essential for the Efficient Export of Secretory DMP1 From the Endoplasmic Reticulum. J Cell Physiol 2015; 231:1468-75. [PMID: 26595451 DOI: 10.1002/jcp.25265] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2015] [Accepted: 11/19/2015] [Indexed: 11/07/2022]
Abstract
Dentin matrix protein 1 (DMP1) is found abundantly in the extracellular matrices of bone and dentin. Secretory DMP1 begins with a tripeptide of leucine-proline-valine (LPV) after the endoplasmic reticulum (ER)-entry signal peptide is cleaved. The goal of this study was to determine the role of the LPV motif in the secretion of DMP1. A series of DNA constructs was generated to express various forms of DMP1 with or without the LPV motif. These constructs were transfected into a preosteoblast cell line, the MC3T3-E1 cells, and the subcellular localization and secretion of various forms of DMP1 were examined by immunofluorescent staining and Western-blotting analyses. Immunofluorescent staining showed that the LPV-containing DMP1 variants were primarily localized in the Golgi complex, whereas the LPV-lacking DMP1 variants were found abundantly within the ER. Western-blotting analyses demonstrated that the LPV-containing DMP1 variants were rapidly secreted from the transfected cells, as they did not accumulate within the cells, and the amounts increased in the conditioned media over time. In contrast, the LPV-lacking DMP1 variants were predominantly retained within the cells, and only small amounts were secreted out of the cells over time. These results suggest that the LPV motif is essential for the efficient export of secretory DMP1 from the ER to the Golgi complex.
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Affiliation(s)
- Tian Liang
- Department of Biomedical Sciences and Center for Craniofacial Research and Diagnosis, Texas A&M University Baylor College of Dentistry, Dallas, Texas
| | - Tian Meng
- Department of Biomedical Sciences and Center for Craniofacial Research and Diagnosis, Texas A&M University Baylor College of Dentistry, Dallas, Texas
| | - Suzhen Wang
- Department of Biomedical Sciences and Center for Craniofacial Research and Diagnosis, Texas A&M University Baylor College of Dentistry, Dallas, Texas
| | - Chunlin Qin
- Department of Biomedical Sciences and Center for Craniofacial Research and Diagnosis, Texas A&M University Baylor College of Dentistry, Dallas, Texas
| | - Yongbo Lu
- Department of Biomedical Sciences and Center for Craniofacial Research and Diagnosis, Texas A&M University Baylor College of Dentistry, Dallas, Texas
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Jia J, Bian Z, Song Y. Dspp mutations disrupt mineralization homeostasis during odontoblast differentiation. Am J Transl Res 2015; 7:2379-2396. [PMID: 26807185 PMCID: PMC4697717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2015] [Accepted: 10/13/2015] [Indexed: 06/05/2023]
Abstract
The main pathological feature in isolated hereditary dentin disorders is the abnormality of dentin mineralization. Dentin sialophosphoprotein (DSPP) gene is the only identified causative gene for the disorders. The present study aims to explore the molecular association between Dspp mutations and the disrupted mineralization homeostasis during odontoblast differentiation. We generated lentivirus constructs with the mouse full-length wild type Dspp cDNA and 3 Dspp mutants and transfected them into mouse odontoblast-lineage cells (OLCs) which were then performed 21-day mineralization inducing differentiation. The formation of mineralized nodules was obviously fewer in mutants. Digital Gene Expression (DGE) showed that Dspp mutation affected the OLC differentiation in a degree. Further examination validated that Dspp (LV-Dspp) overexpressing OLCs possessed the ability to strictly orchestrate framework for mineralization inductors like Bmp2, Col1 and Runx2, and proliferative markers for mineralization like Alp and Ocn, as well as mineral homeostasis feedback regulators Mgp and Htra1. However, the missense mutation in Dspp signal peptide region (LV-M2) and the nonsense mutation (LV-M5) broke this orchestration. The results suggested that the mutant Dspp disrupt the dynamic homeostasis of mineralization during OLC differentiation. We are the first to use full-length mouse Dspp gene expression system to explore the mineralization mechanism by which inductors and inhibitors adjust each other during odontoblast differentiation. Our findings shed new light on association between Dspp and the dynamic homeostasis of mineralization inductors and inhibitors, and indicate the disruption of mineralization homeostasis might be a crucial reason for Dspp mutations resulting in dentin disorders.
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Affiliation(s)
- Jie Jia
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory of Oral Biomedicine Ministry of Education, School and Hospital of Stomatology, Wuhan University 237 Luoyu Road, Wuhan 430079, China
| | - Zhuan Bian
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory of Oral Biomedicine Ministry of Education, School and Hospital of Stomatology, Wuhan University 237 Luoyu Road, Wuhan 430079, China
| | - Yaling Song
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory of Oral Biomedicine Ministry of Education, School and Hospital of Stomatology, Wuhan University 237 Luoyu Road, Wuhan 430079, China
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Kobuke S, Suzuki S, Hoshino H, Haruyama N, Nishimura F, Shiba H. Relationship between length variations in Ser/Asp-rich repeats in phosphophoryn and in vitro precipitation of calcium phosphate. Arch Oral Biol 2015; 60:1263-72. [PMID: 26099661 DOI: 10.1016/j.archoralbio.2015.05.013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2015] [Revised: 03/30/2015] [Accepted: 05/27/2015] [Indexed: 10/23/2022]
Abstract
OBJECTIVE Phosphophoryn (PP) is generated from the proteolytic cleavage of dentin sialophosphoprotein (DSPP). PP which contains tandem serine/asparatic acid rich repeats (SDrr) is known to enhance dentin mineralization. The nucleotide sequences coding SDrr are identified in the DSPP genes of toothed animals and the length variations of SDrr between intra- and inter-species have been reported. However, it remains unknown about the relationship between the length variations in SDrr and the functions of PP in matrix mineralization. DESIGN By utilizing a mammalian expression system, we generated several recombinant PP proteins (rPP) containing SDrr of different lengths and analyzed their effects on the precipitation of calcium phosphate with an in vitro gel diffusion system. RESULTS rPP-Δ37.6 SDrr and rPP-Δ63.5 SDrr, which possessed shortened SDrr that accounted for 62.4 and 36.5% the length of SDrr in full-length rPP (rPP-full), respectively, induced the precipitation of calcium phosphate similar to that of rPP-full at the same molar concentration, whereas rPP-ΔSDrr, in which SDrr were flipped, did not. Furthermore, rPP-Δ63.5 SDrr significantly increased the accumulation of calcium compared with rPP-full at adjusted concentrations so that the same amounts of SDrr were embedded. The results of an ELISA analysis indicated that the amounts of rPP-Δ37.6 SDrr and rPP-Δ63.5 SDrr secreted from transfected cells were 5.2- and 7.1-fold greater than that of rPP-full, respectively. CONCLUSIONS The generated rPP-Δ63.5 SDrr which can be substituted for rPP-full may be a candidate for a therapeutic molecule to facilitate hard tissue generation such as reparative dentin formation.
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Affiliation(s)
- Seiji Kobuke
- Department of Biological Endodontics, Integrated Health Sciences, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, 734-8553, Japan
| | - Shigeki Suzuki
- Department of Biological Endodontics, Integrated Health Sciences, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, 734-8553, Japan.
| | - Hiroaki Hoshino
- Department of Biological Endodontics, Integrated Health Sciences, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, 734-8553, Japan
| | - Naoto Haruyama
- Section of Orthodontics and Dentofacial Orthopedics, Faculty of Dental Science, Kyushu University, Fukuoka, 812-5852, Japan
| | - Fusanori Nishimura
- Section of Periodontology, Division of Oral Rehabilitation, Faculty of Dental Science, Kyushu University, Fukuoka, 812-5852, Japan
| | - Hideki Shiba
- Department of Biological Endodontics, Integrated Health Sciences, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima, 734-8553, Japan
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Yamamoto R, Oida S, Yamakoshi Y. Dentin Sialophosphoprotein-derived Proteins in the Dental Pulp. J Dent Res 2015; 94:1120-7. [PMID: 25951824 DOI: 10.1177/0022034515585715] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
Porcine dentin sialophosphoprotein (DSPP), the most abundant noncollagenous protein in dentin, is critical for proper mineralization of tooth dentin. DSPP is processed by proteases into 3 major domains: dentin sialoprotein (DSP), dentin glycoprotein (DGP), and dentin phosphoprotein (DPP). There are at least 2 mRNA variants expressed from the Dspp gene: one encodes the full-length DSPP protein (DSP+DGP+DPP); the other encodes only DSP. The shorter transcript is generated through the use of a polyadenylation signal within intron 4, immediately following the DSP coding region (DGP and DPP are encoded by exon 5). We fractionated DSPP-derived proteins from the dental pulp of developing porcine incisors using heparin chromatography. DSP was identified, but little DPP could be detected in any fractions. BMP-1 digestion of DSPP-derived proteins extracted from dental pulp did not generate new DPP bands on sodium dodecyl sulfate-polyacrylamide gel electrophoresis (indicating an absence of intact DSPP), although the results suggested another BMP-1 cleavage site within DSP. We further purified DSPP-derived protein by reversed-phase high-performance liquid chromatography. Its amino acid composition was similar to DSP. Expression of the full-length Dspp mRNA by quantitative real-time polymerase chain reaction analysis was significantly higher in odontoblasts than in pulp, while expression of the DSP-only mRNA was almost equal in odontoblasts and in the body of the pulp. Expression of the full-length Dspp mRNA was also significantly higher than the expression of DSP-only mRNA in odontoblasts. Both the full-length and the DSP-only Dspp mRNA showed only trace expression in the pulp tip. We conclude that use of the 3' polyadenylation signal in exon 5 predominates in fully differentiated odontoblasts, while both polyadenylation signals are used throughout odontoblast differentiation.
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Affiliation(s)
- R Yamamoto
- Department of Biochemistry and Molecular Biology, School of Dental Medicine, Tsurumi University, Tsurumi-ku, Yokohama, Japan
| | - S Oida
- Department of Biochemistry and Molecular Biology, School of Dental Medicine, Tsurumi University, Tsurumi-ku, Yokohama, Japan
| | - Y Yamakoshi
- Department of Biochemistry and Molecular Biology, School of Dental Medicine, Tsurumi University, Tsurumi-ku, Yokohama, Japan
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Suzuki S, Kobuke S, Haruyama N, Hoshino H, Kulkarni AB, Nishimura F. Adhesive and migratory effects of phosphophoryn are modulated by flanking peptides of the integrin binding motif. PLoS One 2014; 9:e112490. [PMID: 25396425 PMCID: PMC4232355 DOI: 10.1371/journal.pone.0112490] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2014] [Accepted: 10/18/2014] [Indexed: 12/17/2022] Open
Abstract
Phosphophoryn (PP) is generated from the proteolytic cleavage of dentin sialophosphoprotein (DSPP). Gene duplications in the ancestor dentin matrix protein-1 (DMP-1) genomic sequence created the DSPP gene in toothed animals. PP and DMP-1 are phosphorylated extracellular matrix proteins that belong to the family of small integrin-binding ligand N-linked glycoproteins (SIBLINGs). Many SIBLING members have been shown to evoke various cell responses through the integrin-binding Arg-Gly-Asp (RGD) domain; however, the RGD-dependent function of PP is not yet fully understood. We demonstrated that recombinant PP did not exhibit any obvious cell adhesion ability, whereas the simultaneously purified recombinant DMP-1 did. A cell adhesion inhibitory analysis was performed by pre-incubating human osteosarcoma MG63 cells with various PP peptides before seeding onto vitronectin. The results obtained revealed that the incorporation of more than one amino acid on both sides of the PP-RGD domain was unable to inhibit the adhesion of MG63 cells onto vitronectin. Furthermore, the inhibitory activity of a peptide containing the PP-RGD domain with an open carboxyl-terminal side (H-463SDESDTNSESANESGSRGDA482-OH) was more potent than that of a peptide containing the RGD domain with an open amino-terminal side (H-478SRGDASYTSDESSDDDNDSDSH499-OH). This phenomenon was supported by the potent cell adhesion and migration abilities of the recombinant truncated PP, which terminated with Ala482. Furthermore, various point mutations in Ala482 and/or Ser483 converted recombinant PP into cell-adhesive proteins. Therefore, we concluded that the Ala482-Ser483 flanking sequence, which was detected in primates and mice, was the key peptide bond that allowed the PP-RGD domain to be sequestered. The differential abilities of PP and DMP-1 to act on integrin imply that DSPP was duplicated from DMP-1 to serve as a crucial extracellular protein for tooth development rather than as an integrin-mediated signaling molecule.
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Affiliation(s)
- Shigeki Suzuki
- Department of Dental Science for Health Promotion, Hiroshima University Institute of Biomedical and Health Sciences, Hiroshima, Japan
- * E-mail:
| | - Seiji Kobuke
- Department of Dental Science for Health Promotion, Hiroshima University Institute of Biomedical and Health Sciences, Hiroshima, Japan
| | - Naoto Haruyama
- Section of Orthodontics and Dentofacial Orthopedics, Faculty of Dental Science, Kyushu University, Fukuoka, Japan
| | - Hiroaki Hoshino
- Department of Dental Science for Health Promotion, Hiroshima University Institute of Biomedical and Health Sciences, Hiroshima, Japan
| | - Ashok B. Kulkarni
- Functional Genomics Section, Laboratory of Cell and Developmental Biology, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Fusanori Nishimura
- Section of Periodontology, Division of Oral Rehabilitation, Faculty of Dental Science, Kyushu University, Japan
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de La Dure-Molla M, Philippe Fournier B, Berdal A. Isolated dentinogenesis imperfecta and dentin dysplasia: revision of the classification. Eur J Hum Genet 2014; 23:445-51. [PMID: 25118030 DOI: 10.1038/ejhg.2014.159] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2014] [Revised: 07/08/2014] [Accepted: 07/10/2014] [Indexed: 11/09/2022] Open
Abstract
Dentinogenesis imperfecta is an autosomal dominant disease characterized by severe hypomineralization of dentin and altered dentin structure. Dentin extra cellular matrix is composed of 90% of collagen type I and 10% of non-collagenous proteins among which dentin sialoprotein (DSP), dentin glycoprotein (DGP) and dentin phosphoprotein (DPP) are crucial in dentinogenesis. These proteins are encoded by a single gene: dentin sialophosphoprotein (DSPP) and undergo several post-translational modifications such as glycosylation and phosphorylation to contribute and to control mineralization. Human mutations of this DSPP gene are responsible for three isolated dentinal diseases classified by Shield in 1973: type II and III dentinogenesis imperfecta and type II dentin dysplasia. Shield classification was based on clinical phenotypes observed in patient. Genetics results show now that these three diseases are a severity variation of the same pathology. So this review aims to revise and to propose a new classification of the isolated forms of DI to simplify diagnosis for practitioners.
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Affiliation(s)
- Muriel de La Dure-Molla
- 1] Centre de Recherche des Cordeliers, INSERM UMRS 872, Laboratory of Molecular Oral Pathophysiology, Paris, France [2] Paris-Descartes University, Paris, France [3] The Pierre-and-Marie-Curie University, Paris, France [4] Paris-Diderot, School of Dentistry, Paris, France [5] Reference Center for Dental Rare Disease, MAFACE Rothschild Hospital, AP-HP, Paris, France
| | - Benjamin Philippe Fournier
- 1] Centre de Recherche des Cordeliers, INSERM UMRS 872, Laboratory of Molecular Oral Pathophysiology, Paris, France [2] Paris-Descartes University, Paris, France [3] The Pierre-and-Marie-Curie University, Paris, France [4] Paris-Diderot, School of Dentistry, Paris, France [5] Reference Center for Dental Rare Disease, MAFACE Rothschild Hospital, AP-HP, Paris, France
| | - Ariane Berdal
- 1] Centre de Recherche des Cordeliers, INSERM UMRS 872, Laboratory of Molecular Oral Pathophysiology, Paris, France [2] Paris-Descartes University, Paris, France [3] The Pierre-and-Marie-Curie University, Paris, France [4] Paris-Diderot, School of Dentistry, Paris, France [5] Reference Center for Dental Rare Disease, MAFACE Rothschild Hospital, AP-HP, Paris, France
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Nam AS, Yin Y, von Marschall Z, Fisher LW. Efficient trafficking of acidic proteins out of the endoplasmic reticulum involves a conserved amino terminal IleProVal (IPV)-like tripeptide motif. Connect Tissue Res 2014; 55 Suppl 1:138-41. [PMID: 24844412 PMCID: PMC4153534 DOI: 10.3109/03008207.2014.923852] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Most of the proposed extracellular biomineralization processes include the secretion of proteins that interact with mineral ions and/or mineral surfaces. Typically these proteins are acidic or have acidic domains that interact with multivalent cations in the extracellular environment. We propose that most acidic, Ca(2+)-binding proteins challenge the cell's mechanisms for trafficking through the endoplasmic reticulum (ER) lumen due to lumenal mM calcium that cause them to form large aggregates. We have recently shown that >95% of the DSPP mutations that cause non-syndromic genetic dentin diseases start their dominant negative affects by failing to rapidly exit the ER likely by forming complexes that cannot be normally trafficked to the Golgi. The complexes of mutant DSPP then capture more (severe disease) or less (mild disease) of the DSPP translated from the normal allele. After searching genomic databases as well as the published literature, we found the IleProVal (IPV)-like motif at the predicted amino terminus of many acidic proteins made in the mineralizing as well as non-mineralizing tissues of many species including vertebrates, echinoderms, mollusks, and yeast. While we often focused on acidic proteins reported associated with mineralizing structures, proteins associated with hormones and their storage/secretion, digestion, blood functions, as well as milk and other secreted fluids started with variations of the motif. Our hypothesis is that the IPV-like motif interacts with a highly conserved cargo receptor in the ER that efficiently traffics the acidic proteins out of the organelle before they can form harmful aggregates in the Ca(2+)-rich lumen.
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Affiliation(s)
| | | | | | - Larry W. Fisher
- corresponding author: Room 223, Building 30, 9000 Rockville Pike, Bethesda, MD, 20892-4320. Phone: 301-496-5769, Fax: 301-402-0824,
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36
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Domain of dentine sialoprotein mediates proliferation and differentiation of human periodontal ligament stem cells. PLoS One 2013; 8:e81655. [PMID: 24400037 PMCID: PMC3882282 DOI: 10.1371/journal.pone.0081655] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2013] [Accepted: 10/15/2013] [Indexed: 01/05/2023] Open
Abstract
Classic embryological studies have documented the inductive role of root dentin on adjacent periodontal ligament differentiation. The biochemical composition of root dentin includes collagens and cleavage products of dentin sialophosphoprotein (DSPP), such as dentin sialoprotein (DSP). The high abundance of DSP in root dentin prompted us to ask the question whether DSP or peptides derived thereof would serve as potent biological matrix components to induce periodontal progenitors to further differentiate into periodontal ligament cells. Here, we test the hypothesis that domain of DSP influences cell fate. In situ hybridization and immunohistochemical analyses showed that the COOH-terminal DSP domain is expressed in mouse periodontium at various stages of root development. The recombinant COOH-terminal DSP fragment (rC-DSP) enhanced attachment and migration of human periodontal ligament stem cells (PDLSC), human primary PDL cells without cell toxicity. rC-DSP induced PDLSC cell proliferation as well as differentiation and mineralization of PDLSC and PDL cells by formation of mineralized tissue and ALPase activity. Effect of rC-DSP on cell proliferation and differentiation was to promote gene expression of tooth/bone-relate markers, transcription factors and growth factors. The results for the first time showed that rC-DSP may be one of the components of cell niche for stimulating stem/progenitor cell proliferation and differentiation and a natural scaffold for periodontal regeneration application.
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37
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Ulucan K, Akyüz S, Özbay G, Pekiner FN, İlter Güney A. Evaluation of vitamin D receptor (VDR) gene polymorphisms (FokI, TaqI and ApaI) in a family with dentinogenesis imperfecta. CYTOL GENET+ 2013. [DOI: 10.3103/s0095452713050101] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Wang F, Wu LA, Li W, Yang Y, Guo F, Gao Q, Chuang HH, Shoff L, Wang W, Chen S. Immortalized mouse dental papilla mesenchymal cells preserve odontoblastic phenotype and respond to bone morphogenetic protein 2. In Vitro Cell Dev Biol Anim 2013; 49:626-37. [PMID: 23813243 PMCID: PMC3779316 DOI: 10.1007/s11626-013-9641-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2013] [Accepted: 05/16/2013] [Indexed: 12/24/2022]
Abstract
Odontogenesis is the result of the reciprocal interactions between epithelial–mesenchymal cells leading to terminally differentiated odontoblasts. This process from dental papilla mesenchymal cells to odontoblasts is regulated by a complex signaling pathway. When isolated from the developing tooth germs, odontoblasts quickly lose their potential to maintain the odontoblast-specific phenotype. Therefore, generation of an odontoblast-like cell line would be a good surrogate model for studying the dental mesenchymal cell differentiation into odontoblasts and the molecular events of dentin formation. In this study, immortalized dental papilla mesenchymal cell lines were generated from the first mouse mandibular molars at postnatal day 3 using pSV40. These transformed cells were characterized by RT-PCR, immunohistochemistry, Western blot, and analyzed for alkaline phosphatase activity and mineralization nodule formation. One of these immortalized cell lines, iMDP-3, displayed a high proliferation rate, but retained the genotypic and phenotypic characteristics similar to primary cells as determined by expression of tooth-specific markers and demonstrated the ability to differentiate and form mineralized nodules. Furthermore, iMDP-3 cells had high transfection efficiency as well as were inducible and responded to BMP2 stimulation. We conclude that the establishment of the stable murine dental papilla mesenchymal cell line might be used for studying the mechanisms of dental cell differentiation and dentin formation.
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Affiliation(s)
- Feng Wang
- Department of Developmental Dentistry, Dental School, The University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX 78229-3900 USA
- Department of Anatomy, Histology & Embryology, Basic Medical College, Fujian Medical University, Fuzhou, 350108 China
| | - Li-An Wu
- Department of Pediatric Dentistry, School of Stomatology, The Fourth Military Medical University, Xi-an, China
| | - Wentong Li
- Department of Developmental Dentistry, Dental School, The University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX 78229-3900 USA
| | - Yuan Yang
- Department of Developmental Dentistry, Dental School, The University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX 78229-3900 USA
| | - Feng Guo
- Department of Developmental Dentistry, Dental School, The University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX 78229-3900 USA
| | - Qingping Gao
- Department of Developmental Dentistry, Dental School, The University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX 78229-3900 USA
| | - Hui-Hsiu Chuang
- Department of Developmental Dentistry, Dental School, The University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX 78229-3900 USA
| | - Lisa Shoff
- Department of Developmental Dentistry, Dental School, The University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX 78229-3900 USA
| | - Wei Wang
- Department of Anatomy, Histology & Embryology, Basic Medical College, Fujian Medical University, Fuzhou, 350108 China
| | - Shuo Chen
- Department of Developmental Dentistry, Dental School, The University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX 78229-3900 USA
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Yoshizaki K, Yamada Y. Gene evolution and functions of extracellular matrix proteins in teeth. ACTA ACUST UNITED AC 2013; 72:1-10. [PMID: 23539364 DOI: 10.1016/j.odw.2013.01.040] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The extracellular matrix (ECM) not only provides physical support for tissues, but it is also critical for tissue development, homeostasis and disease. Over 300 ECM molecules have been defined as comprising the "core matrisome" in mammals through the analysis of whole genome sequences. During tooth development, the structure and functions of the ECM dynamically change. In the early stages, basement membranes (BMs) separate two cell layers of the dental epithelium and the mesenchyme. Later in the differentiation stages, the BM layer is replaced with the enamel matrix and the dentin matrix, which are secreted by ameloblasts and odontoblasts, respectively. The enamel matrix genes and the dentin matrix genes are each clustered in two closed regions located on human chromosome 4 (mouse chromosome 5), except for the gene coded for amelogenin, the major enamel matrix protein, which is located on the sex chromosomes. These genes for enamel and dentin matrix proteins are derived from a common ancestral gene, but as a result of evolution, they diverged in terms of their specific functions. These matrix proteins play important roles in cell adhesion, polarity, and differentiation and mineralization of enamel and dentin matrices. Mutations of these genes cause diseases such as odontogenesis imperfect (OI) and amelogenesis imperfect (AI). In this review, we discuss the recently defined terms matrisome and matrixome for ECMs, as well as focus on genes and functions of enamel and dentin matrix proteins.
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Affiliation(s)
- Keigo Yoshizaki
- Laboratory of Cell and Developmental Biology, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MD 20814, USA
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40
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Fuchs SM. Chemically modified tandem repeats in proteins: natural combinatorial peptide libraries. ACS Chem Biol 2013; 8:275-82. [PMID: 23157399 DOI: 10.1021/cb3005066] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Many proteins composed of tandem repeats (a linear motif, directly repeated within the sequence) are substrates for post-translational modifications (PTMs). Tandem repeats are also dynamic in number, presumably due to instability in the underlying DNA sequence. These observations lead to a hypothesis that cells use a combination of PTMs and variability in repeat number to mediate protein function. Evidence of these processes co-regulating diverse aspects of cellular function can be found in all organisms from bacteria to humans, suggesting a common but poorly described mechanism for regulating and diversifying protein function. This review highlights several examples whereby protein modifications and repetitive protein domains impart diversity. Lastly, it speculates on the possibility of using chemically modified repetitive amino acid sequences to develop peptide-based biomolecules with novel functions.
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Affiliation(s)
- Stephen M. Fuchs
- Department of Biology, Tufts University, 200 Boston Avenue, Medford, Massachusetts
02155, United States
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A DSPP mutation causing dentinogenesis imperfecta and characterization of the mutational effect. BIOMED RESEARCH INTERNATIONAL 2012; 2013:948181. [PMID: 23509818 PMCID: PMC3591212 DOI: 10.1155/2013/948181] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/14/2012] [Revised: 09/28/2012] [Accepted: 10/12/2012] [Indexed: 11/17/2022]
Abstract
Mutations in the DSPP gene have been identified in nonsyndromic hereditary dentin defects, but the genotype-phenotype correlations are not fully understood. Recently, it has been demonstrated that the mutations of DSPP affecting the IPV leader sequence result in mutant DSPP retention in rough endoplasmic reticulum (ER). In this study, we identified a Korean family with dentinogenesis imperfecta type III. To identify the disease causing mutation in this family, we performed mutational analysis based on candidate gene sequencing. Exons and exon-intron boundaries of DSPP gene were sequenced, and the effects of the identified mutation on the pre-mRNA splicing and protein secretion were investigated. Candidate gene sequencing revealed a mutation (c.50C > T, p.P17L) in exon 2 of the DSPP gene. The splicing assay showed that the mutation did not influence pre-mRNA splicing. However, the mutation interfered with protein secretion and resulted in the mutant protein remaining largely in the ER. These results suggest that the mutation affects ER-to-Golgi apparatus export and results in the reduction of secreted DSPP and ER overload. This may induce cell stress and damage processing and/or transport of dentin matrix proteins or other critical proteins.
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Wang SK, Chan HC, Makovey I, Simmer JP, Hu JCC. Novel PAX9 and COL1A2 missense mutations causing tooth agenesis and OI/DGI without skeletal abnormalities. PLoS One 2012; 7:e51533. [PMID: 23227268 PMCID: PMC3515487 DOI: 10.1371/journal.pone.0051533] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2012] [Accepted: 11/05/2012] [Indexed: 01/24/2023] Open
Abstract
Inherited dentin defects are classified into three types of dentinogenesis imperfecta (DGI) and two types of dentin dysplasia (DD). The genetic etiology of DD-I is unknown. Defects in dentin sialophosphoprotein (DSPP) cause DD type II and DGI types II and III. DGI type I is the oral manifestation of osteogenesis imperfecta (OI), a systemic disease typically caused by defects in COL1A1 or COL1A2. Mutations in MSX1, PAX9, AXIN2, EDA and WNT10A can cause non-syndromic familial tooth agenesis. In this study a simplex pattern of clinical dentinogenesis imperfecta juxtaposed with a dominant pattern of hypodontia (mild tooth agenesis) was evaluated, and available family members were recruited. Mutational analyses of the candidate genes for DGI and hypodontia were performed and the results validated. A spontaneous novel mutation in COL1A2 (c.1171G>A; p.Gly391Ser) causing only dentin defects and a novel mutation in PAX9 (c.43T>A; p.Phe15Ile) causing hypodontia were identified and correlated with the phenotypic presentations in the family. Bone radiographs of the proband's dominant leg and foot were within normal limits. We conclude that when no DSPP mutation is identified in clinically determined isolated DGI cases, COL1A1 and COL1A2 should be considered as candidate genes. PAX9 mutation p.Phe15Ile within the N-terminal β-hairpin structure of the PAX9 paired domain causes tooth agenesis.
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Affiliation(s)
- Shih-Kai Wang
- Department of Biologic and Materials Sciences, University of Michigan School of Dentistry, Ann Arbor, Michigan, United States of America
| | - Hui-Chen Chan
- Department of Biologic and Materials Sciences, University of Michigan School of Dentistry, Ann Arbor, Michigan, United States of America
| | - Igor Makovey
- Department of Biologic and Materials Sciences, University of Michigan School of Dentistry, Ann Arbor, Michigan, United States of America
| | - James P. Simmer
- Department of Biologic and Materials Sciences, University of Michigan School of Dentistry, Ann Arbor, Michigan, United States of America
| | - Jan C-C. Hu
- Department of Biologic and Materials Sciences, University of Michigan School of Dentistry, Ann Arbor, Michigan, United States of America
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Isowa Y, Sarashina I, Setiamarga DHE, Endo K. A comparative study of the shell matrix protein aspein in pterioid bivalves. J Mol Evol 2012; 75:11-8. [PMID: 22922907 DOI: 10.1007/s00239-012-9514-3] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2011] [Accepted: 08/03/2012] [Indexed: 12/28/2022]
Abstract
Aspein is one of the unusually acidic shell matrix proteins originally identified from the pearl oyster Pinctada fucata. Aspein is thought to play important roles in the shell formation, especially in calcite precipitation in the prismatic layer. In this study, we identified Aspein homologs from three closely related pterioid species: Pinctada maxima, Isognomon perna, and Pteria penguin. Our immunoassays showed that they are present in the calcitic prismatic layer but not in the aragonitic nacreous layer of the shells. Sequence comparison showed that the Ser-Glu-Pro and the Asp-Ala repeat motifs are conserved among these Aspein homologs, indicating that they are functionally important. All Aspein homologs examined share the Asp-rich D-domain, suggesting that this domain might have a very important function in calcium carbonate formation. However, sequence analyses showed a significantly high level of variation in the arrangement of Asp in the D-domain even among very closely related species. This observation suggests that specific arrangements of Asp are not required for the functions of the D-domain.
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Affiliation(s)
- Yukinobu Isowa
- Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
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Yun YR, Jeon E, Lee S, Kang W, Kim SG, Kim HW, Suh CK, Jang JH. Expression, Purification, and Characterization of a Dentin Phosphoprotein Produced by Escherichia coli, and Its Odontoblastic Differentiation Effects on Human Dental Pulp Cells. Protein J 2012; 31:504-10. [DOI: 10.1007/s10930-012-9430-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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von Marschall Z, Mok S, Phillips MD, McKnight DA, Fisher LW. Rough endoplasmic reticulum trafficking errors by different classes of mutant dentin sialophosphoprotein (DSPP) cause dominant negative effects in both dentinogenesis imperfecta and dentin dysplasia by entrapping normal DSPP. J Bone Miner Res 2012; 27:1309-21. [PMID: 22392858 PMCID: PMC3390460 DOI: 10.1002/jbmr.1573] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Families with nonsyndromic dentinogenesis imperfecta (DGI) and the milder, dentin dysplasia (DD), have mutations in one allele of the dentin sialophosphoprotein (DSPP) gene. Because loss of a single Dspp allele in mice (and likely, humans) causes no dental phenotype, the mechanism(s) underling the dominant negative effects were investigated. DSPP mutations occur in three classes. (The first class, the mid-leader missense mutation, Y6D, was not investigated in this report.) All other 5′ mutations of DSPP result in changes/loss in the first three amino acids (isoleucine-proline-valine [IPV]) of mature DSPP or, for the A15V missense mutation, some retention of the hydrophobic leader sequence. All of this second class of mutations caused mutant DSPP to be retained in the rough endoplasmic reticulum (rER) of transfected HEK293 cells. Trafficking out of the rER by coexpressed normal DSPP was reduced in a dose-responsive manner, probably due to formation of Ca2+-dependent complexes with the retained mutant DSPP. IPV-like sequences begin many secreted Ca2+-binding proteins, and changing the third amino acid to the charged aspartate (D) in three other acidic proteins also caused increased rER accumulation. Both the leader-retaining A15V and the long string of hydrophobic amino acids resulting from all known frameshift mutations within the 3′-encoded Ca2+-binding repeat domain (third class of mutations) caused retention by association of the mutant proteins with rER membranes. More 5′ frameshift mutations result in longer mutant hydrophobic domains, but the milder phenotype, DD, probably due to lower effectiveness of the remaining, shorter Ca2+-binding domain in capturing normal DSPP protein within the rER. This study presents evidence of a shared underlying mechanism of capturing of normal DSPP by two different classes of DSPP mutations and offers an explanation for the mild (DD-II) versus severe (DGI-II and III) nonsyndromic dentin phenotypes. Evidence is also presented that many acidic, Ca2+-binding proteins may use the same IPV-like receptor/pathway for exiting the rER.
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Affiliation(s)
- Zofia von Marschall
- Craniofacial and Skeletal Diseases Branch, National Institute of Dental and Craniofacial Research, National Institutes of Health/DHHS, 9000 Rockville Pike, Bethesda, MD, USA 20892-4320, USA
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Suzuki S, Haruyama N, Nishimura F, Kulkarni AB. Dentin sialophosphoprotein and dentin matrix protein-1: Two highly phosphorylated proteins in mineralized tissues. Arch Oral Biol 2012; 57:1165-75. [PMID: 22534175 DOI: 10.1016/j.archoralbio.2012.03.005] [Citation(s) in RCA: 106] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2011] [Revised: 02/23/2012] [Accepted: 03/20/2012] [Indexed: 12/15/2022]
Abstract
Dentin sialophosphoprotein (DSPP) and dentin matrix protein-1 (DMP-1) are highly phosphorylated proteins that belong to the family of small integrin-binding ligand N-linked glycoproteins (SIBLINGs), and are essential for proper development of hard tissues such as teeth and bones. In order to understand how they contribute to tissue organization, DSPP and DMP-1 have been analyzed for over a decade using both in vivo and in vitro techniques. Among the five SIBLINGs, the DSPP and DMP-1 genes are located next to each other and their gene and protein structures are most similar. In this review we examine the phenotypes of the genetically engineered mouse models of DSPP and DMP-1 and also introduce complementary in vitro studies into the molecular mechanisms underlying these phenotypes. DSPP affects the mineralization of dentin more profoundly than DMP-1. In contrast, DMP-1 significantly affects bone mineralization and importantly controls serum phosphate levels by regulating serum FGF-23 levels, whereas DSPP does not show any systemic effects. DMP-1 activates integrin signalling and is endocytosed into the cytoplasm whereupon it is translocated to the nucleus. In contrast, DSPP only activates integrin-dependent signalling. Thus it is now clear that both DSPP and DMP-1 contribute to hard tissue mineralization and the tissues affected by each are different presumably as a result of their different expression levels. In fact, in comparison with DMP-1, the functional analysis of cell signalling by DSPP remains relatively unexplored.
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Affiliation(s)
- Shigeki Suzuki
- Department of Dental Science for Health Promotion, Division of Cervico-Gnathostomatology, Hiroshima University Graduate School of Biomedical Sciences, Hiroshima, Japan.
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Hereditary dentine diseases resulting from mutations in DSPP gene. J Dent 2012; 40:542-8. [PMID: 22521702 DOI: 10.1016/j.jdent.2012.04.004] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2011] [Revised: 04/04/2012] [Accepted: 04/05/2012] [Indexed: 02/02/2023] Open
Abstract
OBJECTIVES This review groups the newest results of molecular analyses of DSPP gene for patients diagnosed either with dentinogenesis imperfecta type II/III or dentine dysplasia and tries to link the phenotypes with specific mutations in the DSPP gene. DATA The review includes biochemical data introducing a specificity of DSPP protein which justifies it as a critical factor for dentine mineralization and maturation. The majority of the review analyzes mutations in the DSPP gene which result in phenotypes of dentinogenesis imperfecta types II or/and III or dentine dysplasia. SOURCES An electronic search was conducted in the databases of Pub Med and supplemented by manual study of relevant references. STUDY SELECTION 52 out of 108 references were finally selected for the review based on the novelty and/or originality of data. CONCLUSION Hereditary dentine disorders dentinogenesis imperfecta type II/III and dentine dysplasia are currently proposed to be one disease with distinct clinical manifestations reflecting various mutations in the same DSPP gene. For years both disorders were linked exclusively to mutations in the DSP code but a growing number of papers describe mutations which manifest a similar phenotype but are localized in the strongly repetitive sequence of the 3' terminus of the DSPP which codes DPP protein. Our search suggests that the localization of mutation in the sequence of the DSPP gene might result in a different phenotype due to the diverse cellular fate of the mutated protein. Thus comprehensive research on the cellular fate and processing of both normal and mutated DSPP is still required.
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Li D, Du X, Zhang R, Shen B, Huang Y, Valenzuela RK, Wang B, Zhao H, Liu Z, Li J, Xu Z, Gao L, Ma J. Mutation identification of the DSPP in a Chinese family with DGI-II and an up-to-date bioinformatic analysis. Genomics 2012; 99:220-6. [PMID: 22310900 DOI: 10.1016/j.ygeno.2012.01.006] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2011] [Revised: 01/16/2012] [Accepted: 01/23/2012] [Indexed: 11/28/2022]
Abstract
In this study, through linkage analysis of a four-generation Chinese family with multiple members afflicted with DGI (type II), we identified a novel missense mutation in DSPP. The mutation was located in exon 2 at the second nucleotide position of the last codon and resulted in a substitution of a proline with a leucine residue (c.50C>T, p.P17L, g.50C>T). To assess the potential effects of this novel mutation, we utilized various bioinformatics analysis programs. The results indicate that the mutation likely affects protein cleavage/trafficking. We also analyzed previously reported mutations of DSPP. In summary, our finding supports that the genomic sequence that corresponds to the P17 residue of DSPP is a mutational hotspot and P17 may be critical for the function of DSPP.
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Affiliation(s)
- Daxu Li
- Department of Genetics and Molecular Biology, Xi'an Jiaotong University School of Medicine, Xi'an, Shaanxi 710061, PR China
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Wang SK, Chan HC, Rajderkar S, Milkovich RN, Uston KA, Kim JW, Simmer JP, Hu JCC. Enamel malformations associated with a defined dentin sialophosphoprotein mutation in two families. Eur J Oral Sci 2011; 119 Suppl 1:158-67. [PMID: 22243242 PMCID: PMC3266624 DOI: 10.1111/j.1600-0722.2011.00874.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Dentin sialophosphoprotein (DSPP) mutations cause dentin dysplasia type II (DD-II) and dentinogenesis imperfecta types II and III (DGI-II and DGI-III, respectively). We identified two kindreds with DGI-II who exhibited vertical bands of hypoplastic enamel. Both families had a previously reported DSPP mutation that segregated with the disease phenotype. Oral photographs and dental radiographs of four affected and one unaffected participant in one family and of the proband in the second family were used to document the dental phenotypes. We aligned the 33 unique allelic DSPP sequences showing variable patterns of insertions and deletions (indels), generated a merged dentin phosphoprotein (DPP) sequence that includes sequences from all DSPP length haplotypes, and mapped the known DSPP mutations in this context. Analyses of the DSPP sequence changes and their probable effects on protein expression, as well as published findings of the dental phenotype in Dspp null mice, support the hypothesis that all DSPP mutations cause pathology through dominant-negative effects. Noting that Dspp is transiently expressed by mouse pre-ameloblasts during formation of the dentino-enamel junction, we hypothesize that DSPP dominant-negative effects potentially cause cellular pathology in pre-ameloblasts that, in turn, causes enamel defects. We conclude that enamel defects can be part of the dental phenotype caused by DSPP mutations, although DSPP is not critical for dental enamel formation.
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Affiliation(s)
- Shih-Kai Wang
- Department of Biologic and Materials Sciences, University of Michigan School of Dentistry, 1210 Eisenhower Place, Ann Arbor, MI, USA 48108
- Oral Health Sciences program, University of Michigan School of Dentistry; 1011 North University, Ann Arbor, MI, USA 48109
| | - Hui-Chen Chan
- Department of Biologic and Materials Sciences, University of Michigan School of Dentistry, 1210 Eisenhower Place, Ann Arbor, MI, USA 48108
| | - Sudha Rajderkar
- Oral Health Sciences program, University of Michigan School of Dentistry; 1011 North University, Ann Arbor, MI, USA 48109
| | - Rachel N. Milkovich
- Department of Biologic and Materials Sciences, University of Michigan School of Dentistry, 1210 Eisenhower Place, Ann Arbor, MI, USA 48108
| | - Karen A. Uston
- Department of Orthodontics and Pediatric Dentistry, University of Michigan School of Dentistry, 1011 North University, Ann Arbor, MI, USA 48109
| | - Jung-Wook Kim
- Department of Pediatric Dentistry & Dental Research Institute, School of Dentistry, Seoul National University, 275-1 Yongon-dong, Chongno-gu, Seoul 110-768, Korea
| | - James P. Simmer
- Department of Biologic and Materials Sciences, University of Michigan School of Dentistry, 1210 Eisenhower Place, Ann Arbor, MI, USA 48108
| | - Jan C-C. Hu
- Department of Biologic and Materials Sciences, University of Michigan School of Dentistry, 1210 Eisenhower Place, Ann Arbor, MI, USA 48108
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