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Kanchanasevee C, Sriwattanapong K, Theerapanon T, Thaweesapphithak S, Chetruengchai W, Porntaveetus T, Shotelersuk V. Phenotypic and Genotypic Features of Thai Patients With Nonsyndromic Tooth Agenesis and WNT10A Variants. Front Physiol 2020; 11:573214. [PMID: 33329022 PMCID: PMC7710930 DOI: 10.3389/fphys.2020.573214] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Accepted: 10/27/2020] [Indexed: 11/18/2022] Open
Abstract
Tooth agenesis is one of the most common orodental anomalies that demonstrate phenotypic and genotypic heterogeneity with a prevalence of 2.5%–7%. Mutations in WNT10A have been proposed to be the most common cause of nonsyndromic tooth agenesis (NSTA). The aim of this study was to characterize the dental features and genetic variants of NSTA in a Thai population. We recruited 13 unrelated patients with NSTA who attended the Faculty of Dentistry, Chulalongkorn University, Thailand, from 2017 to 2019. All 13 underwent whole exome sequencing that identified likely pathogenic genetic variants, all in WNT10A, in five patients. All five patients had second premolar agenesis, while three also had absent or peg-shaped upper lateral incisors. Patient 1 possessed a novel heterozygous duplication, c.916_918dupAAC (p.Asn306dup) in WNT10A. Patients 2 and 3 harbored a heterozygous and homozygous c.637G > A (p.Gly213Ser) in WNT10A, respectively. Patients 4 possessed a heterozygous c.511C > T (p.Arg171Cys) in WNT10A. Patient 5 harbored a homozygous c.511C > T (p.Arg171Cys) in WNT10A and a novel heterozygous c.413A > T (p.Asn138Ile) in EDARADD, suggesting digenic inheritance. We recruited another 18 family members of these five patients. Out of 23 participants, homozygous WNT10A variants were identified in 2 patients and heterozygous variants in 17 individuals. Both homozygous patients had NSTA. Eight out of 17 heterozygous individuals (8/17) had NSTA or a peg-shaped lateral incisor, indicating a 47% penetrance of the heterozygous variants or 53% (10/19) penetrance of either homozygous or heterozygous variants in WNT10A. The frequencies of the c.511C > T in our in-house 1,876 Thai exome database, Asian populations, and non-Asian populations were 0.016, 0.005–0.033, and 0.001, respectively; while those of the c.637G > A were 0.016, 0.004–0.029, and 0.000, respectively. In conclusion, our study reports two novel variants with one each in WNT10A and EDARADD, expanding the genotypic spectra of NSTA. Second premolar agenesis is a common phenotype in affected individuals with variants in WNT10A; however, its penetrance is incomplete. Lastly, the different frequencies of WNT10A variants, c.511C > T and c.637G > A, in diverse populations might contribute to the prevalence range of NSTA between continents.
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Affiliation(s)
- Charinya Kanchanasevee
- Geriatric Dentistry and Special Patients Care International Program, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
| | - Kanokwan Sriwattanapong
- Genomics and Precision Dentistry Research Unit, Department of Physiology, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
| | - Thanakorn Theerapanon
- Genomics and Precision Dentistry Research Unit, Department of Physiology, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
| | - Sermporn Thaweesapphithak
- Center of Excellence for Regenerative Dentistry, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
| | - Wanna Chetruengchai
- Center of Excellence for Medical Genomics, Medical Genomics Cluster, Department of Pediatrics, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand.,Excellence Center for Genomics and Precision Medicine, King Chulalongkorn Memorial Hospital, Thai Red Cross Society, Bangkok, Thailand
| | - Thantrira Porntaveetus
- Genomics and Precision Dentistry Research Unit, Department of Physiology, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
| | - Vorasuk Shotelersuk
- Center of Excellence for Medical Genomics, Medical Genomics Cluster, Department of Pediatrics, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand.,Excellence Center for Genomics and Precision Medicine, King Chulalongkorn Memorial Hospital, Thai Red Cross Society, Bangkok, Thailand
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2
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Wang H, Liu Y, Zheng Y, Zhao X, Lin S, Zhang Q, Zhang X. A novel missense mutation of LRP6 identified by whole-exome sequencing in a Chinese family with non-syndromic tooth agenesis. Orthod Craniofac Res 2020; 24:233-240. [PMID: 32844563 DOI: 10.1111/ocr.12424] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2020] [Revised: 07/21/2020] [Accepted: 08/14/2020] [Indexed: 12/19/2022]
Abstract
OBJECTIVE The aim of this study was to explore the genetic basis of non-syndromic tooth agenesis (TA) in a Chinese family of five individuals using whole-exome sequencing (WES) analysis. SETTINGS AND SAMPLE POPULATION Five participants/Family-based study of a non-syndromic TA proband. METHODS The proband, proband's mother and grandmother displayed congenital tooth deficiency. Genomic DNA was extracted from the peripheral blood or saliva samples of the proband, her parents and her grandmother, and WES was utilized to identify the causal genetic mutation. The identified mutation was further verified by Sanger sequencing and analysed using bioinformatics tools. RESULTS A novel missense mutation, c.G711T (p.L237F), was identified in the low-density lipoprotein receptor-related protein 6 (LRP6) gene in all affected individuals. Bioinformatics analysis predicted the mutation to be deleterious, with the mutant LRP6 protein displaying a tertiary structural change that might disturb the Wnt/β-catenin signalling pathway. CONCLUSIONS The identification of the mutation in the LRP6 gene and autosomal dominant inheritance with TA in the generations is consistent with the mutation being responsible for TA in the family, and furthers the association of LRP6 with nonsyndromic TA.
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Affiliation(s)
- Huijuan Wang
- Department of Pediatric Dentistry, Stomatological Hospital of Tianjin Medical University, Tianjin, China
| | - Yi Liu
- Department of Genetics, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, China
| | - Yafei Zheng
- University Student Innovation and Entrepreneurship Guidance Center, Tianjin Medical College, Tianjin, China
| | - Xiaoxue Zhao
- Department of Pediatric Dentistry, Tianjin Stomatological Hospital, Tianjin, China
| | - Shiyi Lin
- Department of Pediatric Dentistry, Stomatological Hospital of Tianjin Medical University, Tianjin, China
| | - Qin Zhang
- Department of Pediatric Dentistry, Stomatological Hospital of Tianjin Medical University, Tianjin, China
| | - Xiangyu Zhang
- Department of Pediatric Dentistry, Stomatological Hospital of Tianjin Medical University, Tianjin, China
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3
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Sadier A, Twarogowska M, Steklikova K, Hayden L, Lambert A, Schneider P, Laudet V, Hovorakova M, Calvez V, Pantalacci S. Modeling Edar expression reveals the hidden dynamics of tooth signaling center patterning. PLoS Biol 2019; 17:e3000064. [PMID: 30730874 PMCID: PMC6382175 DOI: 10.1371/journal.pbio.3000064] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2018] [Revised: 02/20/2019] [Accepted: 01/24/2019] [Indexed: 12/31/2022] Open
Abstract
When patterns are set during embryogenesis, it is expected that they are straightly established rather than subsequently modified. The patterning of the three mouse molars is, however, far from straight, likely as a result of mouse evolutionary history. The first-formed tooth signaling centers, called MS and R2, disappear before driving tooth formation and are thought to be vestiges of the premolars found in mouse ancestors. Moreover, the mature signaling center of the first molar (M1) is formed from the fusion of two signaling centers (R2 and early M1). Here, we report that broad activation of Edar expression precedes its spatial restriction to tooth signaling centers. This reveals a hidden two-step patterning process for tooth signaling centers, which was modeled with a single activator-inhibitor pair subject to reaction-diffusion (RD). The study of Edar expression also unveiled successive phases of signaling center formation, erasing, recovering, and fusion. Our model, in which R2 signaling center is not intrinsically defective but erased by the broad activation preceding M1 signaling center formation, predicted the surprising rescue of R2 in Edar mutant mice, where activation is reduced. The importance of this R2-M1 interaction was confirmed by ex vivo cultures showing that R2 is capable of forming a tooth. Finally, by introducing chemotaxis as a secondary process to RD, we recapitulated in silico different conditions in which R2 and M1 centers fuse or not. In conclusion, pattern formation in the mouse molar field relies on basic mechanisms whose dynamics produce embryonic patterns that are plastic objects rather than fixed end points.
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Affiliation(s)
- Alexa Sadier
- Laboratoire de Biologie et Modélisation de la Cellule, Université de Lyon, ENS de Lyon, Univ Claude Bernard, CNRS UMR 5239, INSERM U1210, Lyon, France
- Institut de Génomique Fonctionnelle de Lyon, Université de Lyon, ENS de Lyon, Univ Claude Bernard, CNRS UMR 5239, Lyon, France
| | - Monika Twarogowska
- Unité de Mathématiques Pures et Appliquées, project team Inria NUMED, Université de Lyon, ENS de Lyon, CNRS UMR 5669, Lyon, France
| | - Klara Steklikova
- Institute of Experimental Medicine, The Czech Academy of Sciences, Prague, Czech Republic
- Department of Cell Biology, Faculty of Science, Charles University, Prague, Czech Republic
| | - Luke Hayden
- Laboratoire de Biologie et Modélisation de la Cellule, Université de Lyon, ENS de Lyon, Univ Claude Bernard, CNRS UMR 5239, INSERM U1210, Lyon, France
- Institut de Génomique Fonctionnelle de Lyon, Université de Lyon, ENS de Lyon, Univ Claude Bernard, CNRS UMR 5239, Lyon, France
| | - Anne Lambert
- Institut de Génomique Fonctionnelle de Lyon, Université de Lyon, ENS de Lyon, Univ Claude Bernard, CNRS UMR 5239, Lyon, France
| | - Pascal Schneider
- Department of Biochemistry, University of Lausanne, CH-1066 Epalinges, Switzerland
| | - Vincent Laudet
- Institut de Génomique Fonctionnelle de Lyon, Université de Lyon, ENS de Lyon, Univ Claude Bernard, CNRS UMR 5239, Lyon, France
| | - Maria Hovorakova
- Institute of Experimental Medicine, The Czech Academy of Sciences, Prague, Czech Republic
| | - Vincent Calvez
- Institut Camille Jordan, Université de Lyon, Université Claude Bernard, CNRS UMR 5208, Lyon, France
| | - Sophie Pantalacci
- Laboratoire de Biologie et Modélisation de la Cellule, Université de Lyon, ENS de Lyon, Univ Claude Bernard, CNRS UMR 5239, INSERM U1210, Lyon, France
- Institut de Génomique Fonctionnelle de Lyon, Université de Lyon, ENS de Lyon, Univ Claude Bernard, CNRS UMR 5239, Lyon, France
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4
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Shim JS, Kim B, Park HC, Ryu JJ. Temporal Control of WNT Activity Regulates Tooth Number in Fish. J Dent Res 2018; 98:339-346. [PMID: 30513239 DOI: 10.1177/0022034518811322] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Wnts determine cell polarity, cell proliferation, and cell differentiation during embryogenesis and play an essential role during tooth development initiation and morphogenesis. Wnt/β-catenin signaling has a time-dependent role in development because various signaling molecules that mutually interact are involved in the pathway, and tight regulation of the pathway is essential for normal development. Studies investigating how the Wnt/β-catenin signaling pathway controls the different stages of tooth development are rare. Specifically, the effects of Wnt/β-catenin signaling loss of function on different stages of tooth development are currently unknown. Here, we report the stage-dependent role of Wnt/β-catenin signaling in tooth development. In vivo loss and gain of function of Wnt/β-catenin signaling were implemented through the genetic overexpression of DKK1 with heat shock-inducible transgenic models and the pharmacologic inhibition of β-catenin destruction complex formation in zebrafish, respectively. We demonstrated that transient inhibition of Wnt/β-catenin signaling interrupted tooth development in a stage-dependent manner and conditional activation of Wnt/β-catenin signaling during 4V morphogenesis inhibited the development of 3V. These findings suggest that Wnt/β-catenin signaling plays an important role in the morphogenesis of teeth and the initiation of sequential tooth development in a stage-dependent manner.
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Affiliation(s)
- J S Shim
- 1 Department of Prosthodontics, Korea University Ansan Hospital, Ansan-si, Republic of Korea
| | - B Kim
- 2 Graduate School of Medicine, Korea University, Ansan-si, Republic of Korea
| | - H C Park
- 2 Graduate School of Medicine, Korea University, Ansan-si, Republic of Korea
| | - J J Ryu
- 3 Department of Prosthodontics Korea University Anam Hospital, Seoul, Republic of Korea
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Lu X, Yu F, Liu J, Cai W, Zhao Y, Zhao S, Liu S. The epidemiology of supernumerary teeth and the associated molecular mechanism. Organogenesis 2017; 13:71-82. [PMID: 28598258 DOI: 10.1080/15476278.2017.1332554] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
Abstract
Supernumerary teeth are common clinical dental anomalies. Although various studies have provided abundant information regarding genes and signaling pathways involved in tooth morphogenesis, which include Wnt, FGF, BMP, and Shh, the molecular mechanism of tooth formation, especially for supernumerary teeth, is still unclear. In the population, some cases of supernumerary teeth are sporadic, while others are syndrome-related with familial hereditary. The prompt and accurate diagnosis of syndrome related supernumerary teeth is quite important for some distinctive disorders. Mice are the most commonly used model system for investigating supernumerary teeth. The upregulation of Wnt and Shh signaling in the dental epithelium results in the formation of multiple supernumerary teeth in mice. Understanding the molecular mechanism of supernumerary teeth is also a component of understanding tooth formation in general and provides clinical guidance for early diagnosis and treatment in the future.
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Affiliation(s)
- Xi Lu
- a Department of Stomatology , Huashan Hospital, Fudan University , Shanghai , P.R. China
| | - Fang Yu
- b Department of Pediatric Dentistry , School & Hospital of Stomatology, Tongji University, Shanghai Engineering Research Center of Tooth Restoration and Regeneration , Shanghai , P. R. China
| | - Junjun Liu
- a Department of Stomatology , Huashan Hospital, Fudan University , Shanghai , P.R. China
| | - Wenping Cai
- a Department of Stomatology , Huashan Hospital, Fudan University , Shanghai , P.R. China
| | - Yumei Zhao
- b Department of Pediatric Dentistry , School & Hospital of Stomatology, Tongji University, Shanghai Engineering Research Center of Tooth Restoration and Regeneration , Shanghai , P. R. China
| | - Shouliang Zhao
- a Department of Stomatology , Huashan Hospital, Fudan University , Shanghai , P.R. China
| | - Shangfeng Liu
- a Department of Stomatology , Huashan Hospital, Fudan University , Shanghai , P.R. China
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6
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Kawasaki K, Kawasaki M, Watanabe M, Idrus E, Nagai T, Oommen S, Maeda T, Hagiwara N, Que J, Sharpe PT, Ohazama A. Expression of Sox genes in tooth development. THE INTERNATIONAL JOURNAL OF DEVELOPMENTAL BIOLOGY 2016; 59:471-8. [PMID: 26864488 DOI: 10.1387/ijdb.150192ao] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Members of the Sox gene family play roles in many biological processes including organogenesis. We carried out comparative in situ hybridization analysis of seventeen sox genes (Sox1-14, 17, 18, 21) during murine odontogenesis from the epithelial thickening to the cytodifferentiation stages. Localized expression of five Sox genes (Sox6, 9, 13, 14 and 21) was observed in tooth bud epithelium. Sox13 showed restricted expression in the primary enamel knots. At the early bell stage, three Sox genes (Sox8, 11, 17 and 21) were expressed in pre-ameloblasts, whereas two others (Sox5 and 18) showed expression in odontoblasts. Sox genes thus showed a dynamic spatio-temporal expression during tooth development.
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Affiliation(s)
- Katsushige Kawasaki
- Division of Oral Anatomy, Department of Oral Biological Science, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
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Huysseune A, Soenens M, Elderweirdt F. Wnt signaling during tooth replacement in zebrafish (Danio rerio): pitfalls and perspectives. Front Physiol 2014; 5:386. [PMID: 25339911 PMCID: PMC4186270 DOI: 10.3389/fphys.2014.00386] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2014] [Accepted: 09/18/2014] [Indexed: 12/24/2022] Open
Abstract
The canonical (β-catenin dependent) Wnt signaling pathway has emerged as a likely candidate for regulating tooth replacement in continuously renewing dentitions. So far, the involvement of canonical Wnt signaling has been experimentally demonstrated predominantly in amniotes. These studies tend to show stimulation of tooth formation by activation of the Wnt pathway, and inhibition of tooth formation when blocking the pathway. Here, we report a strong and dynamic expression of the soluble Wnt inhibitor dickkopf1 (dkk1) in developing zebrafish (Danio rerio) tooth germs, suggesting an active repression of Wnt signaling during morphogenesis and cytodifferentiation of a tooth, and derepression of Wnt signaling during start of replacement tooth formation. To further analyse the role of Wnt signaling, we used different gain-of-function approaches. These yielded disjunct results, yet none of them indicating enhanced tooth replacement. Thus, masterblind (mbl) mutants, defective in axin1, mimic overexpression of Wnt, but display a normally patterned dentition in which teeth are replaced at the appropriate times and positions. Activating the pathway with LiCl had variable outcomes, either resulting in the absence, or the delayed formation, of first-generation teeth, or yielding a regular dentition with normal replacement, but no supernumerary teeth or accelerated tooth replacement. The failure so far to influence tooth replacement in the zebrafish by perturbing Wnt signaling is discussed in the light of (i) potential technical pitfalls related to dose- or time-dependency, (ii) the complexity of the canonical Wnt pathway, and (iii) species-specific differences in the nature and activity of pathway components. Finally, we emphasize the importance of in-depth knowledge of the wild-type pattern for reliable interpretations. It is hoped that our analysis can be inspiring to critically assess and elucidate the role of Wnt signaling in tooth development in polyphyodonts.
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Affiliation(s)
- Ann Huysseune
- Evolutionary Developmental Biology Research Group, Biology Department, Ghent University Ghent, Belgium
| | - Mieke Soenens
- Evolutionary Developmental Biology Research Group, Biology Department, Ghent University Ghent, Belgium
| | - Fien Elderweirdt
- Evolutionary Developmental Biology Research Group, Biology Department, Ghent University Ghent, Belgium
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8
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Kawasaki M, Porntaveetus T, Kawasaki K, Oommen S, Otsuka-Tanaka Y, Hishinuma M, Nomoto T, Maeda T, Takubo K, Suda T, Sharpe PT, Ohazama A. R-spondins/Lgrs expression in tooth development. Dev Dyn 2014; 243:844-51. [PMID: 24616052 DOI: 10.1002/dvdy.24124] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2014] [Revised: 02/18/2014] [Accepted: 02/27/2014] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Tooth development is highly regulated in mammals and it is regulated by networks of signaling pathways (e. g. Tnf, Wnt, Shh, Fgf and Bmp) whose activities are controlled by the balance between ligands, activators, inhibitors and receptors. The members of the R-spondin family are known as activators of Wnt signaling, and Lgr4, Lgr5, and Lgr6 have been identified as receptors for R-spondins. The role of R-spondin/Lgr signaling in tooth development, however, remains unclear. RESULTS We first carried out comparative in situ hybridization analysis of R-spondins and Lgrs, and identified their dynamic spatio-temporal expression in murine odontogenesis. R-spondin2 expression was found both in tooth germs and the tooth-less region, the diastema. We further examined tooth development in R-spondin2 mutant mice, and although molars and incisors exhibited no significant abnormalities, supernumerary teeth were observed in the diastema. CONCLUSIONS R-spondin/Lgr signaling is thus involved in tooth development.
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Affiliation(s)
- Maiko Kawasaki
- Department of Craniofacial Development and Stem Cell Biology, Dental Institute, King's College London, Guy's Hospital, London Bridge, London, United Kingdom; Division of Bio-Prosthodontics, Department of Oral Health Science, Course for Oral Life Science, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
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Peterkova R, Hovorakova M, Peterka M, Lesot H. Three-dimensional analysis of the early development of the dentition. Aust Dent J 2014; 59 Suppl 1:55-80. [PMID: 24495023 PMCID: PMC4199315 DOI: 10.1111/adj.12130] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Tooth development has attracted the attention of researchers since the 19th century. It became obvious even then that morphogenesis could not fully be appreciated from two-dimensional histological sections. Therefore, methods of three-dimensional (3D) reconstructions were employed to visualize the surface morphology of developing structures and to help appreciate the complexity of early tooth morphogenesis. The present review surveys the data provided by computer-aided 3D analyses to update classical knowledge of early odontogenesis in the laboratory mouse and in humans. 3D reconstructions have demonstrated that odontogenesis in the early stages is a complex process which also includes the development of rudimentary odontogenic structures with different fates. Their developmental, evolutionary, and pathological aspects are discussed. The combination of in situ hybridization and 3D reconstruction have demonstrated the temporo-spatial dynamics of the signalling centres that reflect transient existence of rudimentary tooth primordia at loci where teeth were present in ancestors. The rudiments can rescue their suppressed development and revitalize, and then their subsequent autonomous development can give rise to oral pathologies. This shows that tooth-forming potential in mammals can be greater than that observed from their functional dentitions. From this perspective, the mouse rudimentary tooth primordia represent a natural model to test possibilities of tooth regeneration.
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Affiliation(s)
- R Peterkova
- Department of Teratology, Institute of Experimental Medicine, Academy of Sciences of the Czech Republic, Prague, Czech Republic
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10
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Laugel-Haushalter V, Paschaki M, Marangoni P, Pilgram C, Langer A, Kuntz T, Demassue J, Morkmued S, Choquet P, Constantinesco A, Bornert F, Schmittbuhl M, Pannetier S, Viriot L, Hanauer A, Dollé P, Bloch-Zupan A. RSK2 is a modulator of craniofacial development. PLoS One 2014; 9:e84343. [PMID: 24416220 PMCID: PMC3885557 DOI: 10.1371/journal.pone.0084343] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2013] [Accepted: 11/21/2013] [Indexed: 01/11/2023] Open
Abstract
BACKGROUND The RSK2 gene is responsible for Coffin-Lowry syndrome, an X-linked dominant genetic disorder causing mental retardation, skeletal growth delays, with craniofacial and digital abnormalities typically associated with this syndrome. Craniofacial and dental anomalies encountered in this rare disease have been poorly characterized. METHODOLOGY/PRINCIPAL FINDINGS We examined, using X-Ray microtomographic analysis, the variable craniofacial dysmorphism and dental anomalies present in Rsk2 knockout mice, a model of Coffin-Lowry syndrome, as well as in triple Rsk1,2,3 knockout mutants. We report Rsk mutation produces surpernumerary teeth midline/mesial to the first molar. This highly penetrant phenotype recapitulates more ancestral tooth structures lost with evolution. Most likely this leads to a reduction of the maxillary diastema. Abnormalities of molar shape were generally restricted to the mesial part of both upper and lower first molars (M1). Expression analysis of the four Rsk genes (Rsk1, 2, 3 and 4) was performed at various stages of odontogenesis in wild-type (WT) mice. Rsk2 is expressed in the mesenchymal, neural crest-derived compartment, correlating with proliferative areas of the developing teeth. This is consistent with RSK2 functioning in cell cycle control and growth regulation, functions potentially responsible for severe dental phenotypes. To uncover molecular pathways involved in the etiology of these defects, we performed a comparative transcriptomic (DNA microarray) analysis of mandibular wild-type versus Rsk2-/Y molars. We further demonstrated a misregulation of several critical genes, using a Rsk2 shRNA knock-down strategy in molar tooth germs cultured in vitro. CONCLUSIONS This study reveals RSK2 regulates craniofacial development including tooth development and patterning via novel transcriptional targets.
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Affiliation(s)
- Virginie Laugel-Haushalter
- Institute of Genetics and Molecular and Cellular Biology (IGBMC), Centre National de la Recherche Scientifique (UMR 7104), Institut National de la Santé et de la Recherche Médicale (U 964), University of Strasbourg, Illkirch, France
| | - Marie Paschaki
- Institute of Genetics and Molecular and Cellular Biology (IGBMC), Centre National de la Recherche Scientifique (UMR 7104), Institut National de la Santé et de la Recherche Médicale (U 964), University of Strasbourg, Illkirch, France
| | - Pauline Marangoni
- Team «Evo-Devo of Vertebrate Dentition», Institut de Génomique Fonctionnelle de Lyon, Unité Mixte de Recherche 5242 Centre National de la Recherche Scientifique, Ecole Normale Supérieure de Lyon, Claude Bernard Lyon 1 University, Lyon, France
| | - Coralie Pilgram
- Faculty of Dentistry, University of Strasbourg, Strasbourg France
| | - Arnaud Langer
- Faculty of Dentistry, University of Strasbourg, Strasbourg France
| | - Thibaut Kuntz
- Faculty of Dentistry, University of Strasbourg, Strasbourg France
| | - Julie Demassue
- Faculty of Dentistry, University of Strasbourg, Strasbourg France
| | - Supawich Morkmued
- Institute of Genetics and Molecular and Cellular Biology (IGBMC), Centre National de la Recherche Scientifique (UMR 7104), Institut National de la Santé et de la Recherche Médicale (U 964), University of Strasbourg, Illkirch, France
- Faculty of Dentistry, University of Strasbourg, Strasbourg France
- Faculty of Dentistry, Khon Kaen University, Khon Kaen, Thailand
| | - Philippe Choquet
- UF6237 Preclinical Imaging Lab, Biophysics and Nuclear Medicine, Hôpitaux Universitaires de Strasbourg (HUS), Strasbourg, France; ICube, CNRS, University of Strasbourg, Strasbourg, France
| | - André Constantinesco
- UF6237 Preclinical Imaging Lab, Biophysics and Nuclear Medicine, Hôpitaux Universitaires de Strasbourg (HUS), Strasbourg, France; ICube, CNRS, University of Strasbourg, Strasbourg, France
| | - Fabien Bornert
- Faculty of Dentistry, University of Strasbourg, Strasbourg France
- INSERM U1121, "Biomaterials and Bioengineering", University of Strasbourg, Strasbourg, France
| | - Matthieu Schmittbuhl
- Faculty of Dentistry, University of Strasbourg, Strasbourg France
- Reference Centre for Orodental Manifestations of Rare Diseases, Pôle de Médecine et Chirurgie Bucco-dentaires, Hôpitaux Universitaires de Strasbourg (HUS), Strasbourg, France
- INSERM U1121, "Biomaterials and Bioengineering", University of Strasbourg, Strasbourg, France
| | - Solange Pannetier
- Institute of Genetics and Molecular and Cellular Biology (IGBMC), Centre National de la Recherche Scientifique (UMR 7104), Institut National de la Santé et de la Recherche Médicale (U 964), University of Strasbourg, Illkirch, France
| | - Laurent Viriot
- Team «Evo-Devo of Vertebrate Dentition», Institut de Génomique Fonctionnelle de Lyon, Unité Mixte de Recherche 5242 Centre National de la Recherche Scientifique, Ecole Normale Supérieure de Lyon, Claude Bernard Lyon 1 University, Lyon, France
| | - André Hanauer
- Institute of Genetics and Molecular and Cellular Biology (IGBMC), Centre National de la Recherche Scientifique (UMR 7104), Institut National de la Santé et de la Recherche Médicale (U 964), University of Strasbourg, Illkirch, France
| | - Pascal Dollé
- Institute of Genetics and Molecular and Cellular Biology (IGBMC), Centre National de la Recherche Scientifique (UMR 7104), Institut National de la Santé et de la Recherche Médicale (U 964), University of Strasbourg, Illkirch, France
| | - Agnès Bloch-Zupan
- Institute of Genetics and Molecular and Cellular Biology (IGBMC), Centre National de la Recherche Scientifique (UMR 7104), Institut National de la Santé et de la Recherche Médicale (U 964), University of Strasbourg, Illkirch, France
- Faculty of Dentistry, University of Strasbourg, Strasbourg France
- Reference Centre for Orodental Manifestations of Rare Diseases, Pôle de Médecine et Chirurgie Bucco-dentaires, Hôpitaux Universitaires de Strasbourg (HUS), Strasbourg, France
- * E-mail:
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Lagronova-Churava S, Spoutil F, Vojtechova S, Lesot H, Peterka M, Klein OD, Peterkova R. The dynamics of supernumerary tooth development are differentially regulated by Sprouty genes. JOURNAL OF EXPERIMENTAL ZOOLOGY PART B-MOLECULAR AND DEVELOPMENTAL EVOLUTION 2013; 320:307-20. [PMID: 23606267 DOI: 10.1002/jez.b.22502] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2012] [Revised: 02/28/2013] [Accepted: 03/01/2013] [Indexed: 11/10/2022]
Abstract
In mice, a toothless diastema separates the single incisor from the three molars in each dental quadrant. In the prospective diastema of the embryo, small rudimentary buds are found that are presumed to be rudiments of suppressed teeth. A supernumerary tooth occurs in the diastema of adult mice carrying mutations in either Spry2 or Spry4. In the case of Spry2 mutants, the origin of the supernumerary tooth involves the revitalization of a rudimentary tooth bud (called R2), whereas its origin in the Spry4 mutants is not known. In addition to R2, another rudimentary primordium (called MS) arises more anteriorly in the prospective diastema. We investigated the participation of both rudiments (MS and R2) in supernumerary tooth development in Spry2 and Spry4 mutants by comparing morphogenesis, proliferation, apoptosis, size and Shh expression in the dental epithelium of MS and R2 rudiments. Increased proliferation and decreased apoptosis were found in MS and R2 at embryonic day (ED) 12.5 and 13.5 in Spry2(-/-) embryos. Apoptosis was also decreased in both rudiments in Spry4(-/-) embryos, but the proliferation was lower (similar to WT mice), and supernumerary tooth development was accelerated, exhibiting a cap stage by ED13.5. Compared to Spry2(-/-) mice, a high number of Spry4(-/-) supernumerary tooth primordia degenerated after ED13.5, resulting in a low percentage of supernumerary teeth in adults. We propose that Sprouty genes were implicated during evolution in reduction of the cheek teeth in Muridae, and their deletion can reveal ancestral stages of murine dental evolution.
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