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Wang YL, Chu KY, Hsieh TF, Yao CCJ, Lin CH, Lee ZH, Wang SK. Orodental malformations associated with human MSX1 sequence variants. J Am Dent Assoc 2024:S0002-8177(24)00112-0. [PMID: 38713117 DOI: 10.1016/j.adaj.2024.02.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2023] [Revised: 02/20/2024] [Accepted: 02/21/2024] [Indexed: 05/08/2024]
Abstract
BACKGROUND MSX1 sequence variants have been known to cause human tooth agenesis (TA) with or without orofacial clefts. However, their roles during the whole processes of tooth development are not fully understood. This study aimed to characterize a 4-membered family with TA carrying a novel MSX1 pathogenic variant and investigate the disease mechanism. METHODS The authors conducted whole exome analysis to define the disease-causing sequence variant. They performed microcomputed tomography, morphometric analyses, transcriptome profiling, and molecular characterization to study the affected teeth and the gene variant. RESULTS The authors identified an MSX1 pathogenic variant, p.Glu232∗, in affected family members with TA and concomitant orodental anomalies, namely, prominent maxillary labial frenum, central incisor diastema, median maxillary anterior alveolar cleft, tooth fusion, mandibular molar dysmorphology, thin dentin layer, and slender dental roots. MSX1-defective teeth were not apparently microdontic but had thin dentin layers. The mandibular molars showed a homeotic transformation to maxillary counterparts. Genes involved in extracellular matrix organization and dentinogenesis, such as DMP1 and MMP20, were downregulated in dental pulp tissues of MSX1-defective teeth. The p.Glu232∗-truncated MSX1 properly localized to the nucleus but partially lost its transactivation ability. Analyzing reported cases indicated that truncation sequence variants within the homeobox domain of MSX1 caused a more severe TA phenotype than those outside of the homeobox domain, probably due to dominant negativity compared with haploinsufficiency. CONCLUSIONS This study provides in vivo evidence that MSX1 contributes to developmental processes of various orodental tissues in humans. PRACTICAL IMPLICATIONS Clinically, hypertrophic labial frenum, incisor diastema, and median maxillary anterior alveolar cleft might be considered diagnostic for MSX1-associated TA.
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Pop SI, Procopciuc A, Mițariu M, Mițariu L, Pop RV. Personalized and Complex Esthetic Oral Rehabilitation in a Case of Non-Syndromic Oligodontia. J Pers Med 2024; 14:350. [PMID: 38672977 PMCID: PMC11051546 DOI: 10.3390/jpm14040350] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2024] [Revised: 03/19/2024] [Accepted: 03/21/2024] [Indexed: 04/28/2024] Open
Abstract
Dental agenesis is one of the most common developmental anomalies in humans and it is frequently associated with several other oral abnormalities. The present case describes non-familial agenesis of permanent teeth in a twenty-one-year-old boy with no apparent systemic abnormalities. The treatment included a personalized and interdisciplinary approach involving endodontics, orthodontics, implant-supported restorations and prosthetic treatments. The treatment plan was thoroughly elaborated using photographic analysis, study models, orthopantomogram, CBCT and cephalograms. Virtual smile design, diagnostic waxing and mock-ups previsualized the treatment objectives. The edentulous spaces were reconstructed by inserting dental implants and monolithic zirconia implant-supported restorations. The final results showed a highly esthetic and functional rehabilitation. Periodic check-ups have shown that the stability of the result is well maintained and that the implant-supported restorations are an optimal solution for patients with multiple anodontia.
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Affiliation(s)
- Silvia Izabella Pop
- Orthodontic Department, Faculty of Dental Medicine, “George Emil Palade” University of Medicine, Pharmacy, Science, and Technology of Targu Mures, 38 Gh. Marinescu Str., 540139 Târgu Mureș, Romania; (S.I.P.); (R.V.P.)
| | - Ana Procopciuc
- Department of Dental Surgery, Faculty of Dental Medicine, “George Emil Palade” University of Medicine, Pharmacy, Science, and Technology of Targu Mures, 38 Gh. Marinescu Str., 540139 Târgu Mureș, Romania
| | - Mihai Mițariu
- Department of Dental Medicine and Nursing, Faculty of Dental Medicine, Lucian Balga University, Bd-ul. Victoriei, 550024 Sibiu, Romania;
| | - Loredana Mițariu
- Department of Dental Medicine and Nursing, Faculty of Dental Medicine, Lucian Balga University, Bd-ul. Victoriei, 550024 Sibiu, Romania;
| | - Radu Vasile Pop
- Orthodontic Department, Faculty of Dental Medicine, “George Emil Palade” University of Medicine, Pharmacy, Science, and Technology of Targu Mures, 38 Gh. Marinescu Str., 540139 Târgu Mureș, Romania; (S.I.P.); (R.V.P.)
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Intarak N, Manaspon C, Theerapanon T, Prommanee S, Samaranayake L, Shotelersuk V, Porntaveetus T. Tooth agenesis related to a novel KDF1 variant: A case report and literature review. Oral Dis 2024. [PMID: 38501196 DOI: 10.1111/odi.14930] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2024] [Revised: 02/19/2024] [Accepted: 03/05/2024] [Indexed: 03/20/2024]
Abstract
OBJECTIVES To investigate the role of Keratinocyte Differentiation Factor 1 (KDF1) in ectodermal dysplasia (ED) and nonsyndromic tooth agenesis (NSTA) and perform a literature review. METHODS Genome sequencing was used to identify genetic variants in a Thai, NSTA proband and validated through Sanger sequencing. Pathogenicity was assessed using ACMG guidelines, MetaRNN and AlphaMissense. A comprehensive review of KDF1/NSTA cases informed genotype-phenotype analysis of the proband. RESULTS The proband revealed multiple missing teeth, caries and extensive periodontal disease. Deep phenotyping showed no signs of ED beyond tooth agenesis. The identified novel KDF1 variant, p.Ile243Leu, was classified as 'likely pathogenic' by ACMG and predicted as 'detrimental' by MetaRNN and AlphaMissense analyses. A total of 14 reviewed KDF1 cases revealed ED-associated variants (3 variants in 8 patients) clustering in the region of amino acids 251-275, within the DUF4656 domain, while NSTA-causing variants (4 variants in 6 patients) were typically found in amino- or carboxy-termini to this region. KDF1/NSTA cases exhibited an average of 15 missing teeth, with a higher prevalence in the mandible. CONCLUSION This study identifies a novel KDF1 variant-related NSTA in Thai people. The genotype-phenotype correlates suggest a distinctive pattern and tooth agenesis of KDF1-related NSTA.
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Affiliation(s)
- Narin Intarak
- Center of Excellence in Genomics and Precision Dentistry, Department of Physiology, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
| | - Chawan Manaspon
- Biomedical Engineering Institute, Chiang Mai University, Chiang Mai, Thailand
- Biomedical Engineering and Innovation Research Center, Chiang Mai, Thailand
| | - Thanakorn Theerapanon
- Center of Excellence in Genomics and Precision Dentistry, Department of Physiology, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
| | - Sasiprapa Prommanee
- Center of Excellence in Genomics and Precision Dentistry, Department of Physiology, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
| | - Lakshman Samaranayake
- Faculty of Dentistry, University of Hong Kong, Hong Kong and Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
| | - Vorasuk Shotelersuk
- Center of Excellence for Medical Genomics, Department of Pediatrics, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
- Excellence Center for Medical Genetics, King Chulalongkorn Memorial Hospital, Thai Red Cross Society, Bangkok, Thailand
| | - Thantrira Porntaveetus
- Center of Excellence in Genomics and Precision Dentistry, Department of Physiology, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
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Lee YJ, Lee Y, Kim YJ, Lee ZH, Kim JW. Novel PAX9 Mutations Causing Isolated Oligodontia. J Pers Med 2024; 14:191. [PMID: 38392624 PMCID: PMC10890363 DOI: 10.3390/jpm14020191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2024] [Revised: 02/02/2024] [Accepted: 02/07/2024] [Indexed: 02/24/2024] Open
Abstract
Hypodontia, i.e., missing one or more teeth, is a relatively common human disease; however, oligodontia, i.e., missing six or more teeth, excluding the third molars, is a rare congenital disorder. Many genes have been shown to cause oligodontia in non-syndromic or syndromic conditions. In this study, we identified two novel PAX9 mutations in two non-syndromic oligodontia families. A mutational analysis identified a silent mutation (NM_006194.4: c.771G>A, p.(Gln257=)) in family 1 and a frameshift mutation caused by a single nucleotide duplication (c.637dup, p.(Asp213Glyfs*104)) in family 2. A minigene splicing assay revealed that the silent mutation resulted in aberrant pre-mRNA splicing instead of normal splicing. The altered splicing products are ones with an exon 4 deletion or using a cryptic 5' splicing site in exon 4. Mutational effects were further investigated using protein expression, luciferase activity assay and immunolocalization. We believe this study will not only expand the mutational spectrum of PAX9 mutations in oligodontia but also strengthen the diagnostic power related to the identified silent mutation.
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Affiliation(s)
- Ye Ji Lee
- Department of Pediatric Dentistry & DRI, School of Dentistry, Seoul National University, Seoul 03080, Republic of Korea
| | - Yejin Lee
- Department of Pediatric Dentistry & DRI, School of Dentistry, Seoul National University, Seoul 03080, Republic of Korea
| | - Youn Jung Kim
- Department of Pediatric Dentistry & DRI, School of Dentistry, Seoul National University, Seoul 03080, Republic of Korea
| | - Zang Hee Lee
- Department of Cell and Developmental Biology & DRI, School of Dentistry, Seoul National University, Seoul 03080, Republic of Korea
| | - Jung-Wook Kim
- Department of Pediatric Dentistry & DRI, School of Dentistry, Seoul National University, Seoul 03080, Republic of Korea
- Department of Molecular Genetics & DRI, School of Dentistry, Seoul National University, Seoul 03080, Republic of Korea
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Castilho NL, Resende KKM, dos Santos JA, Machado RA, Coletta RD, Guerra ENS, Acevedo AC, Martelli-Junior H. Oligodontia in the Clinical Spectrum of Syndromes: A Systematic Review. Dent J (Basel) 2023; 11:279. [PMID: 38132417 PMCID: PMC10742796 DOI: 10.3390/dj11120279] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Revised: 11/11/2023] [Accepted: 11/17/2023] [Indexed: 12/23/2023] Open
Abstract
The aim of this systematic review was to describe the clinical and genetic features of syndromes showing oligodontia as a sign. The review was performed according to the PRISMA 2020 checklist guidelines, and the search was conducted using PubMed, Scopus, Lilacs, Web of science, Livivo, and EMBASE and supplemented by a gray literature search on Google Scholar and ProQuest, applying key terms relevant to the research questions. The systematic review identified 47 types of syndromes in 83 studies, and the most common was hypohidrotic ectodermal dysplasia, which was reported in 24 patients in 22 studies. Other common syndromes that reported oligodontia included Axenfeld-Rieger syndrome, Witkop's syndrome, Ellis-van Creveld syndrome, blepharocheilodontic syndrome, and oculofaciocardiodental syndrome. The X-linked mode of inheritance was the most reported (n = 13 studies), followed by the autosomal dominant (n = 13 studies). The review describes the main syndromes that may have oligodontia as a clinical sign and reinforces the need for orodental-facial examining for adequate diagnosis and treatment of the affected patients. Molecular analysis in order to better understand the occurrence of oligodontia is imperative.
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Affiliation(s)
- Natália Lopes Castilho
- Health Science Postgraduate Program, State University of Montes Claros, Montes Claros 39400-000, Brazil;
| | - Kêmelly Karolliny Moreira Resende
- Laboratory of Oral Histopathology, Oral Care Center for Inherited Diseases, Health Sciences Faculty, University of Brasilia, Brasilia 70040-010, Brazil; (K.K.M.R.); (E.N.S.G.); (A.C.A.)
| | - Juliana Amorim dos Santos
- Laboratory of Oral Histopathology, Health Sciences Faculty, University of Brasilia, Brasilia 70040-010, Brazil;
| | - Renato Assis Machado
- Department of Oral Diagnosis and Graduate Program in Oral Biology, School of Dentistry, University of Campinas, Piracicaba 13414-018, Brazil; (R.A.M.); (R.D.C.)
| | - Ricardo D. Coletta
- Department of Oral Diagnosis and Graduate Program in Oral Biology, School of Dentistry, University of Campinas, Piracicaba 13414-018, Brazil; (R.A.M.); (R.D.C.)
| | - Eliete Neves Silva Guerra
- Laboratory of Oral Histopathology, Oral Care Center for Inherited Diseases, Health Sciences Faculty, University of Brasilia, Brasilia 70040-010, Brazil; (K.K.M.R.); (E.N.S.G.); (A.C.A.)
| | - Ana Carolina Acevedo
- Laboratory of Oral Histopathology, Oral Care Center for Inherited Diseases, Health Sciences Faculty, University of Brasilia, Brasilia 70040-010, Brazil; (K.K.M.R.); (E.N.S.G.); (A.C.A.)
| | - Hercílio Martelli-Junior
- Health Science Postgraduate Program, State University of Montes Claros, Montes Claros 39400-000, Brazil;
- Oral Medicine and Oral Pathology, School of Dentistry, State University of Montes Claros, Unimontes, Montes Claros 39400-000, Brazil
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Reinhold V, Syrjänen S, Kankuri‐Tammilehto M. New observation of severe tooth malformation in a female patient with ectodermal dysplasia due to the EDA splice acceptor variant c.742-2A>G. Mol Genet Genomic Med 2023; 11:e2275. [PMID: 37665136 PMCID: PMC10724520 DOI: 10.1002/mgg3.2275] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Revised: 08/07/2023] [Accepted: 08/08/2023] [Indexed: 09/05/2023] Open
Abstract
BACKGROUND Ectodermal dysplasias are inherited disorders, which are characterized by congenital defects in two or more ectodermal structures such as skin, sweat glands, hair, nails, teeth, and mucous membranes. METHOD Here, we describe a new observation of significant oligodontia in a female patient with the EDA gene variant c.742-2A>G. RESULTS The results strongly suggest that the EDA gene variant c.742-2A>G is pathogenic. The oligodontia in the proband was exceptionally severe. CONCLUSION We demonstrate that the very rare splice acceptor variant EDA c.742-2A>G is associated with severe oligodontia even in females. Our study points that this variant is pathogenic. An early identification of this variant is crucial for planning adequate treatment and follow-up in time by a multidisciplinary team.
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Affiliation(s)
| | - Stina Syrjänen
- Department of Oral Pathology and Radiology, Faculty of MedicineUniversity of TurkuTurkuFinland
- Department of PathologyTurku University Hospital, University of TurkuTurkuFinland
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Stasiak M, Kołodziejska A, Racka-Pilszak B. Orthodontic Treatment of Palatally Impacted Canines in Severe Non-Syndromic Oligodontia with the Use of Mini-Implants: A Case Report. Medicina (Kaunas) 2023; 59:2032. [PMID: 38004081 PMCID: PMC10673481 DOI: 10.3390/medicina59112032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2023] [Revised: 11/10/2023] [Accepted: 11/14/2023] [Indexed: 11/26/2023]
Abstract
Background: The risk of palatally displaced canines (PDCs) rises in patients with tooth agenesis. The orthodontic extrusion and alignment of PDCs require adequate anchorage to enable tooth movement and control the side effects. There is no paper presenting treatment in the case of severe oligodontia with simultaneous PDCs and the use of mini-implants (MIs) for their orthodontic extrusion. Case presentation: A 15-year-old patient presented with non-syndromic oligodontia and bilateral PDCs. Cone beam computed tomography revealed that both PDCs were in proximity to the upper incisors' roots. There was no evident external root resorption of the incisors. The "canines first" approach was chosen. MIs were used both as direct and indirect anchorage. First, the extrusive forces of cantilevers were directed both occlusally and distally. Next, the buccal directions of forces were implemented. Finally, fixed appliances were used. PDCs were extruded, aligned, and torqued. Proper alignment and occlusion were achieved to enable further prosthodontic restorations. Conclusions: The use of MIs made it possible to avoid collateral effects, reduce the risk of complications, and treat the patient effectively. MIs provide adequate anchorage in demanding cases. The use of MIs for the extrusion of PDCs made it possible to offer this treatment option to patients with severe oligodontia. The presented protocol was effective and served to circumvent treatment limitations associated with an inadequate amount of dental anchorage and a high risk of root resorption.
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Affiliation(s)
- Marcin Stasiak
- Division of Orthodontics, Faculty of Medicine, Medical University of Gdańsk, Aleja Zwycięstwa 42c, 80-210 Gdańsk, Poland
| | - Aleksandra Kołodziejska
- University Dental Center of Medical University of Gdańsk, Dębowa 1a Street, 80-204 Gdańsk, Poland
| | - Bogna Racka-Pilszak
- Division of Orthodontics, Faculty of Medicine, Medical University of Gdańsk, Aleja Zwycięstwa 42c, 80-210 Gdańsk, Poland
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Xie B, Han Y, Wen X. Global Trends and Hotspots in Research on Tooth Agenesis: A 20-Year Bibliometric Analysis. Cureus 2023; 15:e46961. [PMID: 38021739 PMCID: PMC10640767 DOI: 10.7759/cureus.46961] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/11/2023] [Indexed: 12/01/2023] Open
Abstract
Tooth agenesis, one of the most common developmental defects in humans, not only impairs oral function but can also lead to craniofacial deformities. Bibliometric analysis can reveal significant shifts in research and publishing trends within specific fields. This study aims to provide a comprehensive overview of the research hotspots in tooth agenesis and predict future trends through bibliometric analysis. We searched for English-language publications related to tooth agenesis from 2001 to 2021 on the Web of Science. The publications were limited to original and review articles, and bibliometric parameters such as publication year, country, institution, author, journal, citations, and keywords were extracted and analyzed using VOSviewer, Microsoft Excel 2010, and CiteSpace. A total of 2,287 papers were ultimately selected. The results show that the USA holds a leading position in the field of tooth agenesis research. A total of 9,803 authors participated in these studies, with Alexandre R Vieira from the USA being the most prolific and most cited author. This study indicates that multidisciplinary management has become the consensus first choice for treating dental agenesis. Gene mutations related to tooth agenesis continue to be a research hotspot attracting scholarly attention. Exploring the relationship between tooth agenesis and cancer may be a future research direction. These findings contribute to potential collaborations among experts in future research on the genetic causes of tooth agenesis and tumor development and to assist the scientific community by identifying research gaps in this field.
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Affiliation(s)
- Bo Xie
- Department of Orthodontics, Affiliated Stomatological Hospital of Southwest Medical University, Luzhou, CHN
| | - Ying Han
- Department of Oral and Maxillofacial Surgery, Center of Stomatology, Xiangya Hospital, Central South University, Changsha, CHN
| | - Xiujie Wen
- Department of Orthodontics, Affiliated Stomatological Hospital of Southwest Medical University, Luzhou, CHN
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Wredenhagen MS, Goldstein A, Mathieu H, Miranda V, Morali B, Santerre J, Maftei C, Delrue MA, Schmittbuhl M, Vu DD, Moldovan F, Campeau PM. The Quebec Dental Anomalies Registry: Identifying genes for rare disorders. PNAS Nexus 2023; 2:pgad196. [PMID: 37361548 PMCID: PMC10290489 DOI: 10.1093/pnasnexus/pgad196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Revised: 03/28/2023] [Accepted: 05/23/2023] [Indexed: 06/28/2023]
Abstract
There are more than 900 genetic syndromes associated with oral manifestations. These syndromes can have serious health implications, and left undiagnosed, can hamper treatment and prognosis later in life. About 6.67% of the population will develop a rare disease during their lifetime, some of which are difficult to diagnose. The establishment of a data and tissue bank of rare diseases with oral manifestations in Quebec will help medical professionals identify the genes involved, will improve knowledge on the rare genetic diseases, and will also lead to improved patient management. It will also allow samples and information sharing with other clinicians and investigators. As an example of a condition requiring additional research, dental ankylosis is a condition in which the tooth's cementum fuses to the surrounding alveolar bone. This can be secondary to traumatic injury but is often idiopathic, and the genes involved in the idiopathic cases, if any, are poorly known. To date, patients with both identified and unidentified genetic etiology for their dental anomalies were recruited through dental and genetics clinics for the study. They underwent sequencing of selected genes or exome sequencing depending on the manifestation. We recruited 37 patients and we identified pathogenic or likely pathogenic variants in WNT10A, EDAR, AMBN, PLOD1, TSPEAR, PRKAR1A, FAM83H, PRKACB, DLX3, DSPP, BMP2, TGDS. Our project led to the establishment of the Quebec Dental Anomalies Registry, which will help researchers, medical and dental practitioners alike understand the genetics of dental anomalies and facilitate research collaborations into improved standards of care for patients with rare dental anomalies and any accompanying genetic diseases.
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Affiliation(s)
- Madeleine S Wredenhagen
- CHU Sainte-Justine Research Center, 3175 Chemin de la Côte-Sainte-Catherine, Montreal, QC, Canada, H3T1C5 and University of Ottawa, 75 Laurier Ave E, Ottawa, ON, Canada K1N 6N5
| | - Andee Goldstein
- CHU Sainte-Justine Research Center, 3175 Chemin de la Côte-Sainte-Catherine, Montreal, QC, Canada, H3T1C5 and Université de Montréal, 2900 Edouard Montpetit Boulevard, Montreal, QC, Canada, H3T1C5
| | - Hélène Mathieu
- CHU Sainte-Justine Research Center, 3175 Chemin de la Côte-Sainte-Catherine, Montreal, QC, Canada, H3T1C5 and Université de Montréal, 2900 Edouard Montpetit Boulevard, Montreal, QC, Canada, H3T1C5
| | - Valancy Miranda
- Department of Pediatrics, CHU Sainte-Justine Research Center, 3175 Chemin de la Côte-Sainte-Catherine, Montreal, QC, Canada, H3T1C5
| | - Burcin Morali
- Department of Pediatrics, CHU Sainte-Justine, 3175 Chemin de la Côte-Sainte-Catherine, Montreal, QC, Canada, H3T1C5
| | - Jacinthe Santerre
- Department of Pediatrics, CHU Sainte-Justine, 3175 Chemin de la Côte-Sainte-Catherine, Montreal, QC, Canada, H3T1C5
| | - Catalina Maftei
- CHU Sainte-Justine, Genetic Service, 3175 Chemin de la Côte-Sainte-Catherine, Montreal, QC, Canada, H3T1C5
| | - Marie-Ange Delrue
- Department of Pediatrics, CHU Sainte-Justine, 3175 Chemin de la Côte-Sainte-Catherine, Montreal, QC, Canada, H3T1C5
| | - Matthieu Schmittbuhl
- Faculty of Dentistry, Department of Stomatology, Université of Montréal, 2900 Edouard Montpetit Boulevard, Montreal, QC, Canada H3T 1J4
| | - Duy Dat Vu
- Faculty of Dentistry, Université of Montréal, 2900 Edouard Montpetit Boulevard, Montreal, QC, Canada H3T 1J4
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Badnaware S, Srivastava VK, Chandel M. Non-syndromic Oligodontia in Primary Dentition: A Report of a Rare Case. Cureus 2023; 15:e39426. [PMID: 37378140 PMCID: PMC10292124 DOI: 10.7759/cureus.39426] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/24/2023] [Indexed: 06/29/2023] Open
Abstract
The congenital absence of teeth is the most common dental anomaly affecting 2.2% to 10% of the population. It could be present in the form of anodontia, hypodontia, or oligodontia, excluding wisdom teeth. Oligodontia is most commonly associated with several syndromes like ectodermal dysplasia, Down syndrome, and Van der Woude syndrome that involve the mutation of the MSX-1 and PAX-1 genes. Few cases have been reported in the literature on how oligodontia affects primary dentition. In this case report, a total of 17 primary teeth were missing. This case report investigates whether the features of non-syndromic oligodontia are present in the primary dentition in a two-year-old boy.
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Affiliation(s)
- Sheetal Badnaware
- Department of Pedodontics and Preventive Dentistry, Faculty of Dental Sciences, Institute of Medical Sciences, Banaras Hindu University, Varanasi, IND
| | - Vinay Kumar Srivastava
- Department of Pedodontics and Preventive Dentistry, Faculty of Dental Sciences, Institute of Medical Sciences, Banaras Hindu University, Varanasi, IND
| | - Meenakshi Chandel
- Department of Pedodontics and Preventive Dentistry, Faculty of Dental Sciences, Institute of Medical Sciences, Banaras Hindu University, Varanasi, IND
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Chu KY, Wang YL, Chen JT, Lin CH, Yao CCJ, Chen YJ, Chen HW, Simmer JP, Hu JCC, Wang SK. PAX9 mutations and genetic synergism in familial tooth agenesis. Ann N Y Acad Sci 2023. [PMID: 37005710 DOI: 10.1111/nyas.14988] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/04/2023]
Abstract
Familial tooth agenesis (FTA) is one of the most common craniofacial anomalies in humans. Loss-of-function mutations in PAX9 and WNT10A have been known to cause FTA with various expressivity. In this study, we identified five FTA kindreds with novel PAX9 disease-causing mutations: p.(Glu7Lys), p.(Val83Leu), p.(Pro118Ser), p.(Ser197Argfs*23), and c.771+4A>G. Concomitant PAX9 and WNT10A pathogenic variants found in two probands with severe phenotypes suggested an effect of mutational synergism. All overexpressed PAX9s showed proper nuclear localization, excepting the p.(Pro118Ser) mutant. Various missense mutations caused differential loss of PAX9 transcriptional ability. PAX9 overexpression in dental pulp cells upregulated LEF1 and AXIN2 expression, indicating a positive regulatory role for PAX9 in canonical Wnt signaling. Analyzing 176 cases with 63 different mutations, we observed a distinct pattern of tooth agenesis for PAX9-associated FTA: Maxillary teeth are in general more frequently affected than mandibular ones. Along with all second molars, maxillary bicuspids and first molars are mostly involved, while maxillary lateral incisors and mandibular bicuspids are relatively less affected. Genotypically, missense mutations are associated with fewer missing teeth than frameshift and nonsense variants. This study significantly expands the phenotypic and genotypic spectrums of PAX9-associated disorders and reveals a molecular mechanism of genetic synergism underlying FTA variable expressivity.
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Affiliation(s)
- Kuan-Yu Chu
- Department of Dentistry, National Taiwan University School of Dentistry, Taipei City, Taiwan
- Department of Pediatric Dentistry, National Taiwan University Children's Hospital, Taipei City, Taiwan
| | - Yin-Lin Wang
- Department of Dentistry, National Taiwan University School of Dentistry, Taipei City, Taiwan
- Department of Pediatric Dentistry, National Taiwan University Children's Hospital, Taipei City, Taiwan
| | - Jung-Tsu Chen
- Department of Dentistry, National Taiwan University School of Dentistry, Taipei City, Taiwan
| | - Chia-Hui Lin
- Department of Dentistry, National Taiwan University School of Dentistry, Taipei City, Taiwan
| | - Chung-Chen Jane Yao
- Department of Dentistry, National Taiwan University School of Dentistry, Taipei City, Taiwan
| | - Yi-Jane Chen
- Department of Dentistry, National Taiwan University School of Dentistry, Taipei City, Taiwan
| | - Huan-Wen Chen
- Department of Pediatric Dentistry, National Taiwan University Children's Hospital, Taipei City, Taiwan
| | - James P Simmer
- Department of Biologic and Materials Sciences, University of Michigan School of Dentistry, Ann Arbor, Michigan, USA
| | - Jan C-C Hu
- Department of Biologic and Materials Sciences, University of Michigan School of Dentistry, Ann Arbor, Michigan, USA
| | - Shih-Kai Wang
- Department of Dentistry, National Taiwan University School of Dentistry, Taipei City, Taiwan
- Department of Pediatric Dentistry, National Taiwan University Children's Hospital, Taipei City, Taiwan
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12
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Leclerc J, Beaumont M, Vibert R, Pinson S, Vermaut C, Flament C, Lovecchio T, Delattre L, Demay C, Coulet F, Guillerm E, Hamzaoui N, Benusiglio PR, Brahimi A, Cornelis F, Delhomelle H, Fert-Ferrer S, Fournier BPJ, Hovnanian A, Legrand C, Lortholary A, Malka D, Petit F, Saurin JC, Lejeune S, Colas C, Buisine MP. AXIN2 germline testing in a French cohort validates pathogenic variants as a rare cause of predisposition to colorectal polyposis and cancer. Genes Chromosomes Cancer 2023; 62:210-222. [PMID: 36502525 PMCID: PMC10107344 DOI: 10.1002/gcc.23112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Revised: 11/23/2022] [Accepted: 11/29/2022] [Indexed: 12/14/2022] Open
Abstract
Only a few patients with germline AXIN2 variants and colorectal adenomatous polyposis or cancer have been described, raising questions about the actual contribution of this gene to colorectal cancer (CRC) susceptibility. To assess the clinical relevance for AXIN2 testing in patients suspected of genetic predisposition to CRC, we collected clinical and molecular data from the French Oncogenetics laboratories analyzing AXIN2 in this context. Between 2004 and June 2020, 10 different pathogenic/likely pathogenic AXIN2 variants were identified in 11 unrelated individuals. Eight variants were from a consecutive series of 3322 patients, which represents a frequency of 0.24%. However, loss-of-function AXIN2 variants were strongly associated with genetic predisposition to CRC as compared with controls (odds ratio: 11.89, 95% confidence interval: 5.103-28.93). Most of the variants were predicted to produce an AXIN2 protein devoid of the SMAD3-binding and DIX domains, but preserving the β-catenin-binding domain. Ninety-one percent of the AXIN2 variant carriers who underwent colonoscopy had adenomatous polyposis. Forty percent of the variant carriers developed colorectal or/and other digestive cancer. Multiple tooth agenesis was present in at least 60% of them. Our report provides further evidence for a role of AXIN2 in CRC susceptibility, arguing for AXIN2 testing in patients with colorectal adenomatous polyposis or cancer.
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Affiliation(s)
- Julie Leclerc
- Univ. Lille, CNRS, Inserm, CHU Lille, UMR9020-U1277 CANTHER - Cancer Heterogeneity Plasticity and Resistance to Therapies, Lille, France.,Molecular Oncogenetics, Department of Biochemistry and Molecular Biology, Lille University Hospital, Lille, France
| | - Marie Beaumont
- Laboratoire de Génétique Moléculaire et Génomique, CHU Rennes, Rennes, France
| | - Roseline Vibert
- UF d'Oncogénétique Clinique, Département de Génétique et Institut Universitaire de Cancérologie, Hôpitaux Pitié-Salpêtrière et Saint-Antoine, AP-HP. Sorbonne Université, Paris, France
| | - Stéphane Pinson
- Human Genetics Department, Hospices Civils de Lyon, Lyon, France
| | - Catherine Vermaut
- Molecular Oncogenetics, Department of Biochemistry and Molecular Biology, Lille University Hospital, Lille, France
| | - Cathy Flament
- Molecular Oncogenetics, Department of Biochemistry and Molecular Biology, Lille University Hospital, Lille, France
| | - Tonio Lovecchio
- Molecular Oncogenetics, Department of Biochemistry and Molecular Biology, Lille University Hospital, Lille, France
| | - Lucie Delattre
- Molecular Oncogenetics, Department of Biochemistry and Molecular Biology, Lille University Hospital, Lille, France
| | - Christophe Demay
- Bioinformatics Unit, Molecular Biology Facility, Lille University Hospital, Lille, France
| | - Florence Coulet
- Sorbonne University, INSERM, Saint-Antoine Research Center, Microsatellites instability and Cancer, CRSA, Genetics Department, AP-HP, Hôpital Pitié Salpêtrière, Sorbonne University, Paris, France
| | - Erell Guillerm
- Sorbonne University, INSERM, Saint-Antoine Research Center, Microsatellites instability and Cancer, CRSA, Genetics Department, AP-HP, Hôpital Pitié Salpêtrière, Sorbonne University, Paris, France
| | - Nadim Hamzaoui
- Service de Génétique et Biologie Moléculaires, Hôpital Cochin, AP-HP Centre, Université de Paris, and INSERM UMR_S1016, Institut Cochin, Université de Paris, Paris, France
| | - Patrick R Benusiglio
- UF d'Oncogénétique Clinique, Département de Génétique et Institut Universitaire de Cancérologie, Hôpitaux Pitié-Salpêtrière et Saint-Antoine, AP-HP. Sorbonne Université, Paris, France
| | | | - François Cornelis
- Department of Genetics-Oncogénétics-Prevention, Clermont-Ferrand Hospital, Clermont-Auvergne University, Clermont Ferrand, France
| | - Hélène Delhomelle
- Department of Genetics, Curie Institute, Paris Sciences & Lettres Research University, Paris, France
| | | | - Benjamin P J Fournier
- Centre de Recherche des Cordeliers, University of Paris, Sorbonne University, INSERM UMRS 1138 - Molecular Oral Pathophysiology, Paris, France.,Dental Faculty Garanciere, Oral Biology Department, Centre of Reference for Oral and Dental Rare Diseases, AP-HP, University of Paris, Paris, France
| | - Alain Hovnanian
- INSERM UMR 1163 - Laboratory of Genetic Skin Diseases, Imagine Institute, Paris, France.,University of Paris, Paris, France.,Department of Genetics, Necker Hospital for sick children, AP-HP, Paris, France
| | - Clémentine Legrand
- Service de Génétique, Génomique et Procréation, CHU Grenoble Alpes, Grenoble, France
| | - Alain Lortholary
- Centre Catherine de Sienne, hôpital privé du Confluent, Nantes, France
| | - David Malka
- Department of Cancer Medicine, Gustave Roussy, Paris-Saclay University, INSERM UMR 1279 - Unité Dynamique des Cellules Tumorales, Villejuif, France
| | - Florence Petit
- Clinique de Génétique, CHU Lille, Lille, France.,Univ. Lille, EA7364 - RADEME, CHU Lille, Lille, France
| | | | | | - Chrystelle Colas
- Department of Genetics, Curie Institute, Paris Sciences & Lettres Research University, Paris, France
| | - Marie-Pierre Buisine
- Univ. Lille, CNRS, Inserm, CHU Lille, UMR9020-U1277 CANTHER - Cancer Heterogeneity Plasticity and Resistance to Therapies, Lille, France.,Molecular Oncogenetics, Department of Biochemistry and Molecular Biology, Lille University Hospital, Lille, France
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13
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Roht L, Hyldebrandt HK, Stormorken AT, Nordgarden H, Sijmons RH, Bos DK, Riegert-Johnson D, Mantia-Macklin S, Ilves P, Muru K, Wojcik MH, Kahre T, Õunap K. AXIN2-related oligodontia-colorectal cancer syndrome with cleft palate as a possible new feature. Mol Genet Genomic Med 2023:e2157. [PMID: 36860143 DOI: 10.1002/mgg3.2157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Revised: 12/30/2022] [Accepted: 02/09/2023] [Indexed: 03/03/2023] Open
Abstract
BACKGROUND Pathogenic variants in AXIN2 have been associated with tooth agenesis, colon polyps, and colon cancer. Given the rare nature of this phenotype, we set out to collect additional genotypic and phenotypic information. METHODS Data were collected via a structured questionnaire. Sequencing was performed in these patients mostly due to diagnostic purpose. A little more than half of the AXIN2 variant carriers were identified by NGS; other six were family members. RESULTS Here, we report 13 individuals with a heterozygous AXIN2 pathogenic/likely pathogenic variant who have a variable expression of oligodontia-colorectal cancer syndrome (OMIM 608615) or oligodontia-cancer predisposition syndrome (ORPHA 300576). Three individuals from one family also had cleft palate, which might represent a new clinical feature of AXIN2 phenotype, also given the fact that AXIN2 polymorphisms have been found in association with oral clefting in population studies. AXIN2 has already been added to multigene cancer panel tests; further research should be conducted to determine whether it should be added to cleft lip/palate multigene panels. CONCLUSION More clarity about oligodontia-colorectal cancer syndrome, about the variable expression, and associated cancer risks is needed to improve clinical management and to establish guidelines for surveillance. We collected information about the surveillance that was advised, which might support clinical management of these patients.
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Affiliation(s)
- Laura Roht
- Department of Clinical Genetics, Genetic and Personalized Medicine Clinic, Tartu University Hospital, Tartu, Estonia.,Department of Clinical Genetics, Institute of Clinical Medicine, University of Tartu, Tartu, Estonia
| | | | | | - Hilde Nordgarden
- Norwegian National Resource Centre for Oral Health in Rare Diagnosis, Lovisenberg Diaconal Hospital, Oslo, Norway
| | - Rolf H Sijmons
- Department of Genetics, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Dennis K Bos
- Department of Genetics, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | | | - Sarah Mantia-Macklin
- Department of Clinical Genetics and Genomics, Mayo Clinic, Jacksonville, Florida, USA
| | - Pilvi Ilves
- Department of Radiology, Tartu University Hospital, Tartu, Estonia
| | - Kai Muru
- Department of Clinical Genetics, Genetic and Personalized Medicine Clinic, Tartu University Hospital, Tartu, Estonia.,Department of Clinical Genetics, Institute of Clinical Medicine, University of Tartu, Tartu, Estonia
| | - Monica H Wojcik
- Broad Institute of MIT and Harvard, Massachusetts, Cambridge, USA.,Divisions of Genetics and Genomics and Newborn Medicine, Department of Pediatrics, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - Tiina Kahre
- Department of Clinical Genetics, Genetic and Personalized Medicine Clinic, Tartu University Hospital, Tartu, Estonia.,Department of Clinical Genetics, Institute of Clinical Medicine, University of Tartu, Tartu, Estonia
| | - Katrin Õunap
- Department of Clinical Genetics, Genetic and Personalized Medicine Clinic, Tartu University Hospital, Tartu, Estonia.,Department of Clinical Genetics, Institute of Clinical Medicine, University of Tartu, Tartu, Estonia
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14
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García-Martínez VE, Galiana-Vallés X, Zomeño-Alcalá O, Rodríguez-López R, Llena C, Martínez-Romero MDC, Guillén-Navarro E. Dental Phenotype with Minor Ectodermal Symptoms Suggestive of WNT10A Deficiency. Children (Basel) 2023; 10:children10020356. [PMID: 36832485 PMCID: PMC9955033 DOI: 10.3390/children10020356] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/15/2023] [Revised: 02/07/2023] [Accepted: 02/08/2023] [Indexed: 02/16/2023]
Abstract
Ectodermal dysplasias (EDs) represent a heterogeneous group of genetic disorders characterized by the abnormal development of ectodermal-derived tissues. They include the involvement of the hair, nails, skin, sweat glands, and teeth. Pathogenic variants in EDA1 (Xq12-13.1; OMIM*300451), EDAR (2q11-q13; OMIM*604095), EDARADD (1q42-q43, OMIM*606603), and WNT10A (2q35; OMIM*606268) genes are responsible for most EDs. Bi-allelic pathogenic variants of WNT10A have been associated with autosomal recessive forms of ED, as well as non-syndromic tooth agenesis (NSTA). The potential phenotypic impact of associated modifier mutations in other ectodysplasin pathway genes has also been pointed out. We present on an 11-year-old Chinese boy with oligodontia, with conical-shaped teeth as the main phenotype, and other very mild ED signs. The genetic study identified the pathogenic variants WNT10A (NM_025216.3): c.310C > T; p. (Arg104Cys) and c.742C > T; p. (Arg248Ter) in compound heterozygosis, confirmed by parental segregation. In addition, the patient had the polymorphism EDAR (NM_022336.4): c.1109T > C, p. (Val370Ala) in homozygosis, named EDAR370. A prominent dental phenotype with minor ectodermal symptoms is very suggestive of WNT10A mutations. In this case, the EDAR370A allele might also attenuate the severity of other ED signs.
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Affiliation(s)
| | - Ximo Galiana-Vallés
- Laboratory of Molecular Genetics, Clinical Analysis Service, Consortium General University Hospital, 46014 Valencia, Spain
| | - Otilia Zomeño-Alcalá
- Laboratory of Molecular Genetics, Clinical Analysis Service, Consortium General University Hospital, 46014 Valencia, Spain
| | - Raquel Rodríguez-López
- Laboratory of Molecular Genetics, Clinical Analysis Service, Consortium General University Hospital, 46014 Valencia, Spain
| | - Carmen Llena
- Primary Care Dentistry, Departament General University Hospital, 46070 Valencia, Spain
- Departament of Stomatology, Universitat de Valencia, 46010 Valencia, Spain
- Correspondence: ; Tel.: +34-609-92-13-77
| | - María del Carmen Martínez-Romero
- Molecular Genetics Section, Biochemistry and Clinical Genetics Center, University Clinical Hospital Virgen de la Arrixaca, Health Sciences PhD Program-UCAM, 30109 Murcia, Spain
- IMIB-Pascual Parrilla, 30007 Murcia, Spain
- CIBERER-ISCIII, 28029 Madrid, Spain
- Faculty of Medicine and Health Sciences, UCAM Catholic University of Murcia, 30109 Murcia, Spain
| | - Encarna Guillén-Navarro
- IMIB-Pascual Parrilla, 30007 Murcia, Spain
- CIBERER-ISCIII, 28029 Madrid, Spain
- Medical Genetics Section, Pediatrics Department, University Clinical Hospital Virgen de la Arrixaca, University of Murcia (UMU), 30120 Murcia, Spain
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15
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Yoshinaga K, Yasue A, Mitsui SN, Minegishi Y, Oyadomari S, Imoto I, Tanaka E. Effects of Wnt10a and Wnt10b Double Mutations on Tooth Development. Genes (Basel) 2023; 14:genes14020340. [PMID: 36833267 PMCID: PMC9957325 DOI: 10.3390/genes14020340] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2022] [Revised: 01/22/2023] [Accepted: 01/24/2023] [Indexed: 02/03/2023] Open
Abstract
WNT molecules are the regulators of various biological functions, including body axis formation, organ development, and cell proliferation and differentiation. WNTs have been extensively studied as causative genes for an array of diseases. WNT10A and WNT10B, which are considered to be genes of the same origin, have been identified as causative genes for tooth deficiency in humans. However, the disrupted mutant of each gene does not show a decrease in teeth number. A negative feedback loop, interacting with several ligands based on a reaction-diffusion mechanism, was proposed to be important for the spatial patterning of tooth formation, and WNT ligands have been considered to play a pivotal role in controlling tooth patterning from mutant phenotypes of LDL receptor-related proteins (LRPs) and WNT co-receptors. The Wnt10a and Wnt10b double-mutants demonstrated severe root or enamel hypoplasia. In Wnt10a-/- and Wnt10a+/-;Wnt10b-/- mice, changes in the feedback loop may collapse the modulation of fusion or split a sequence of tooth formation. However, in the double-knockout mutant, a decrease in the number of teeth was observed, including the upper incisor or third molar in both jaws. These findings suggest that there may be a functional redundancy between Wnt10a and Wnt10b and that the interaction between the two genes functions in conjunction with other ligands to control the spatial patterning and development of teeth.
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Affiliation(s)
- Kaoru Yoshinaga
- Department of Orthodontics and Dentofacial Orthopedics, Tokushima University Graduate School of Biomedical Sciences, 3-18-15 Kuramoto-cho, Tokushima 770-8504, Japan
| | - Akihiro Yasue
- Department of Orthodontics and Dentofacial Orthopedics, Tokushima University Graduate School of Biomedical Sciences, 3-18-15 Kuramoto-cho, Tokushima 770-8504, Japan
- Nakano-Cho niconicoKamKam Dental and Orthodontics, 1-31 Nakano-cho, Tokushima 770-0932, Japan
- Correspondence: ; Tel.: +81-88-6337357; Fax: +81-88-6339139
| | - Silvia Naomi Mitsui
- Department of Orthodontics and Dentofacial Orthopedics, Tokushima University Graduate School of Biomedical Sciences, 3-18-15 Kuramoto-cho, Tokushima 770-8504, Japan
| | - Yoshiyuki Minegishi
- Division of Molecular Medicine, Institute of Advanced Enzyme Research, Tokushima University, 3-18-15 Kuramoto-cho, Tokushima 770-8503, Japan
| | - Seiichi Oyadomari
- Division of Molecular Biology, Institute of Advanced Enzyme Research, Tokushima University, 3-18-15 Kuramoto-cho, Tokushima 770-8503, Japan
| | - Issei Imoto
- Aichi Cancer Center Research Institute, 1-1 Kanokoden Chikusa-ku, Nagoya 464-8681, Japan
| | - Eiji Tanaka
- Department of Orthodontics and Dentofacial Orthopedics, Tokushima University Graduate School of Biomedical Sciences, 3-18-15 Kuramoto-cho, Tokushima 770-8504, Japan
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16
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Živković M, Stefanović N, Glišić B, Brajović G, Miličić B, Kostić M, Popović B. WNT10A and RUNX2 mutations associated with non-syndromic tooth agenesis. Eur J Oral Sci 2022; 130:e12896. [PMID: 36250548 DOI: 10.1111/eos.12896] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Accepted: 08/31/2022] [Indexed: 12/13/2022]
Abstract
The goal of this study was to examine the prevalence of WNT10A and RUNX2 mutations and assess their potential impact on the phenotype of non-syndromic tooth agenesis. The study included 30 participants with non-syndromic tooth agenesis, divided into hypodontia (n = 24) and oligodontia forms (n = 6), and 42 unaffected family members. Genomic DNA from buccal epithelial cells was used for polymerase chain reaction amplification of functionally important exons of the WNT10A and RUNX2 genes. Direct sequencing reactions were performed to confirm the presence of mutations. The trend of increasing prevalence of WNT10A mutations and a slight increase in the prevalence of RUNX2 mutations were revealed in tooth agenesis cases compared to unaffected family members. There was a higher prevalence of hypodontia than oligodontia, increased frequency of females over males with missing teeth, and a wide phenotypic variability was observed in individuals and families analyzed. The common missense mutations (p.Phe228Ile, p.Arg113Cys, p.Asp217Asn, and p.Gly165Arg) and c.114-56T>C in the WNT10A gene and in-frame-deletion/insertions (11A, 24Q, 30Q), synonymous variant c.240G>A, and 424-33dupC in the RUNX2 gene were identified. These findings highlight an important role of WNT10A and RUNX2 mutations in the genetic etiology of non-syndromic tooth agenesis.
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Affiliation(s)
- Marija Živković
- Department of Orthodontics, University of Belgrade, School of Dental Medicine, Belgrade, Serbia
| | - Neda Stefanović
- Department of Orthodontics, University of Belgrade, School of Dental Medicine, Belgrade, Serbia
| | - Branislav Glišić
- Department of Orthodontics, University of Belgrade, School of Dental Medicine, Belgrade, Serbia
| | - Gavrilo Brajović
- Department of Physiology, University of Belgrade, School of Dental Medicine, Belgrade, Serbia
| | - Biljana Miličić
- Department for Medical Statistics and Informatics, University of Belgrade, School of Dental Medicine, Belgrade, Serbia
| | - Marija Kostić
- Faculty of Hotel Management and Tourism, University of Kragujevac, Vrnjacka Banja, Serbia
| | - Branka Popović
- Department of Human Genetics, University of Belgrade, School of Dental Medicine, Belgrade, Serbia
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17
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Biedziak B, Firlej E, Dąbrowska J, Bogdanowicz A, Zadurska M, Mostowska A. Novel Candidate Genes for Non-Syndromic Tooth Agenesis Identified Using Targeted Next-Generation Sequencing. J Clin Med 2022; 11:6089. [PMID: 36294409 DOI: 10.3390/jcm11206089] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2022] [Revised: 10/10/2022] [Accepted: 10/14/2022] [Indexed: 11/05/2022] Open
Abstract
Non-syndromic tooth agenesis (ns-TA) is one of the most common dental anomalies characterized by the congenital absence of at least one permanent tooth (excluding third molars). Regarding the essential role of genetic factors in ns-TA aetiology, the present study aimed to identify novel pathogenic variants underlying hypodontia and oligodontia. In a group of 65 ns-TA patients and 127 healthy individuals from the genetically homogenous Polish population, the coding sequences of 423 candidate genes were screened using targeted next-generation sequencing. Pathogenic and likely pathogenic variants were identified in 37 (56.92%) patients, including eight nucleotide alternations of genes not previously implicated in ns-TA (CHD7, CREBBP, EVC, LEF1, ROR2, TBX22 and TP63). However, since only single variants were detected, future research is required to confirm and fully understand their role in the aetiology of ns-TA. Additionally, our results support the importance of already known ns-TA candidate genes (AXIN2, EDA, EDAR, IRF6, LAMA3, LRP6, MSX1, PAX9 and WNT10A) and provide additional evidence that ns-TA might be an oligogenic condition involving the cumulative effect of rare variants in two or more distinct genes.
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18
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Lee Y, Chae W, Kim YJ, Kim JW. Novel LRP6 Mutations Causing Non-Syndromic Oligodontia. J Pers Med 2022; 12:jpm12091401. [PMID: 36143186 PMCID: PMC9504909 DOI: 10.3390/jpm12091401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2022] [Revised: 08/26/2022] [Accepted: 08/26/2022] [Indexed: 11/26/2022] Open
Abstract
The process of tooth formation is a series of reciprocal interactions between the ectoderm and mesoderm, and it is believed that many genetic factors are involved in this complex process. More than a dozen genes have been identified in non-syndromic tooth agenesis; however, the genetic etiology underlying tooth agenesis is not fully understood yet. In this study, we identified two novel LRP6 mutations in two non-syndromic oligodontia families. Both probands had 16 and 17 missing teeth in their permanent dentition. Mutational analysis identified a de novo frameshift mutation by a 1-bp insertion in exon 9 (NM_002336.2: c.1870dupA, p.(Met624Asnfs*29)) and a splicing donor site mutation in intron 8 (c.1762+2T>C). An in vitro splicing assay confirmed the deletion of exon 8, and the deletion would result in a frameshift. Due to the premature termination codons introduced by the frameshift, both mutant transcripts would be degraded by nonsense-mediated mRNA decay, resulting in haploinsufficiency.
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Affiliation(s)
- Yejin Lee
- Department of Pediatric Dentistry & DRI, School of Dentistry, Seoul National University, Seoul 03080, Korea
| | - Wonseon Chae
- Department of Pediatric Dentistry & DRI, School of Dentistry, Seoul National University, Seoul 03080, Korea
| | - Youn Jung Kim
- Department of Pediatric Dentistry & DRI, School of Dentistry, Seoul National University, Seoul 03080, Korea
| | - Jung-Wook Kim
- Department of Pediatric Dentistry & DRI, School of Dentistry, Seoul National University, Seoul 03080, Korea
- Department of Molecular Genetics & DRI, School of Dentistry, Seoul National University, Seoul 03080, Korea
- Correspondence:
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19
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Sun R, Li S, Xia B, Zhu J. Detection of Novel Variant and Functional Study in a Chinese Family with Non-syndromic Oligodontia. Oral Dis 2022. [PMID: 35596231 DOI: 10.1111/odi.14259] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Revised: 03/13/2022] [Accepted: 03/20/2022] [Indexed: 11/28/2022]
Abstract
OBJECTIVES To investigate the pathogenic gene of a patient with non-syndromic oligodontia, and analyze its possible pathogenic mechanism. SUBJECTS AND METHODS The variant was detected by whole exome sequencing (WES) and Sanger sequencing in a family with oligodontia. Bioinformatic and structural analyses were used to analyze variant. Functional studies including western blotting and immunofluorescent analyses and luciferase reporter assay were conducted to explore the functional effects. RESULTS We identified a novel frameshift variant of PAX9 (c.491-510delGCCCT-ATCACGGCGGCGGCC, p.P165Qfs*145) outside the DNA-binding domain causing an autosomal-dominant non-syndromic oligodontia in a Chinese family. Bioinformatic and structural analyses revealed that the variant is pathogenic and conserved evolutionarily, and the changes might affect protein stability or folding. Functional studies demonstrate dramatically reduced ability in activating transcription activity of BMP4 promoter and a marked decrease in protein production, as evaluated by western blotting and immunofluorescent analyses. CONCLUSIONS We found a novel frameshift variant of PAX9 causing non-syndromic oligodontia in a Chinese family. Our findings indicate that frameshift variants cause loss of function of PAX9 protein during the patterning of the dentition and the subsequent tooth agenesis, providing new molecular insights into the role of frameshift variant of PAX9 and broaden the pathogenic spectrum of PAX9 variants.
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Affiliation(s)
- Ruiqing Sun
- Department of Pediatric Dentistry, Peking University School and Hospital of Stomatology & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Research Center of Engineering and Technology for Digital Dentistry of Ministry of Health & Beijing Key Laboratory of Digital Stomatology & National Clinical Research Center for Oral Diseases, Beijing 100081, China
| | - Shuangying Li
- Department of Pediatric Dentistry, Yinchuan Stomatology Hospital, Ningxia 750001, China
| | - Bin Xia
- Department of Pediatric Dentistry, Peking University School and Hospital of Stomatology & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Research Center of Engineering and Technology for Digital Dentistry of Ministry of Health & Beijing Key Laboratory of Digital Stomatology & National Clinical Research Center for Oral Diseases, Beijing 100081, China
| | - Junxia Zhu
- Department of Pediatric Dentistry, Peking University School and Hospital of Stomatology & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Research Center of Engineering and Technology for Digital Dentistry of Ministry of Health & Beijing Key Laboratory of Digital Stomatology & National Clinical Research Center for Oral Diseases, Beijing 100081, China
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20
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Intarak N, Theerapanon T, Porntaveetus T, Shotelersuk V. Patterns of molar agenesis associated with p.P20L and p.R77Q variants in PAX9. Eur J Oral Sci 2022; 130:e12855. [PMID: 35182440 DOI: 10.1111/eos.12855] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Accepted: 01/14/2022] [Indexed: 11/29/2022]
Abstract
Nonsyndromic tooth agenesis is associated with variants in several genes. There are numerous genotype-phenotype publications involving many patients and kindreds. Here, we identified six Thai individuals in two families with nonsyndromic tooth agenesis, performed exome sequencing, and conducted functional experiments. Family 1 had four affected members carrying the heterozygous PAX9 variant, c.59C>T (p.Pro20Leu). The p.Pro20Leu was previously reported in two families having four and three affected members. These seven cases and Proband-1 had agenesis of at least three third molars. Family 2 comprised two affected members with agenesis of all 12 molars. Both individuals were heterozygous for c.230G>A (p.Arg77Gln) in PAX9, which has not been reported previously. This variant is predicted to be damaging, evolutionarily conserved, and resides in the PAX9 linking peptide. The BMP4 RNA levels in Proband-1's leukocytes were not significantly different from those in the controls, whereas BMP4 levels observed in Proband-2 were significantly increased. Moreover, the p.Arg77Gln variant demonstrated nuclear localization similar to the wild-type but resulted in significantly impaired transactivation of BMP4, a PAX9 downstream gene. In conclusion, we demonstrate that the PAX9 p.Pro20Leu is highly associated with absent third molars, while the novel PAX9 p.Arg77Gln impairs BMP4 transactivation and is associated with total molar agenesis.
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Affiliation(s)
- Narin Intarak
- 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
| | - 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, the Thai Red Cross Society, Bangkok, Thailand
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21
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Suyama T, Ishikawa H, Tamaoki S, Higa R, Takata S, Sawa Y. Maxillofacial morphological characteristics in growing orthodontic patients with non-syndromic oligodontia. Orthod Craniofac Res 2021; 25:393-400. [PMID: 34825769 DOI: 10.1111/ocr.12548] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Revised: 11/04/2021] [Accepted: 11/12/2021] [Indexed: 11/29/2022]
Abstract
OBJECTIVE Patients with oligodontia frequently show different types of malocclusions. However, how oligodontia affects the maxillofacial growth remains uncertain. This study aimed to investigate the maxillofacial morphological characteristics in growing patients with oligodontia. SETTING AND SAMPLE POPULATION The study subjects included 33 Japanese children with non-syndromic oligodontia (14 boys and 19 girls; mean age: 10.2 years) who visited the orthodontic clinic of Fukuoka Dental College Medical and Dental Hospital from 1999 to 2019. MATERIALS AND METHODS Cephalometric analyses were performed, and the variables measured in each subject were converted into Z scores in relation to the mean and standard deviation of the Japanese norms matched for growth stage. The one-sample t-test or Wilcoxon signed-rank test was performed to compare the mean scores in the patients with oligodontia with those of the Japanese norms. RESULTS Compared with the Japanese norms, patients with oligodontia showed a smaller convexity and larger A-B plane and SNB angles. The Frankfort-mandibular plane and gonial angles were smaller, whereas the height of the ramus was larger. The vertical height of the alveolar bone in the maxillary and mandibular incisors and molar areas was smaller in patients with oligodontia. CONCLUSIONS Patients with oligodontia showed Class III skeletal tendency with mandibular prognathism and flattened mandibular plane with a smaller gonial angle. These maxillofacial morphological features can be induced by a deficiency in the vertical growth of the alveolar bone in the maxillary and mandibular molar areas due to the lack of tooth germs.
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Affiliation(s)
- Taiki Suyama
- Section of Orthodontics, Department of Oral Growth and Development, Fukuoka Dental College, Fukuoka, Japan
| | | | - Sachio Tamaoki
- Section of Orthodontics, Department of Oral Growth and Development, Fukuoka Dental College, Fukuoka, Japan
| | - Remi Higa
- Section of Orthodontics, Department of Oral Growth and Development, Fukuoka Dental College, Fukuoka, Japan
| | - Shunsuke Takata
- Section of Orthodontics, Department of Oral Growth and Development, Fukuoka Dental College, Fukuoka, Japan
| | - Yoshihiko Sawa
- Department of Oral Function & Anatomy, Dentistry and Pharmaceutical Sciences, Okayama University Graduate School of Medicine, Okayama, Japan
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22
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Chu KY, Wang YL, Chou YR, Chen JT, Wang YP, Simmer JP, Hu JCC, Wang SK. Synergistic Mutations of LRP6 and WNT10A in Familial Tooth Agenesis. J Pers Med 2021; 11:jpm11111217. [PMID: 34834569 PMCID: PMC8621929 DOI: 10.3390/jpm11111217] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2021] [Revised: 11/13/2021] [Accepted: 11/13/2021] [Indexed: 02/07/2023] Open
Abstract
Familial tooth agenesis (FTA), distinguished by developmental failure of selected teeth, is one of the most prevalent craniofacial anomalies in humans. Mutations in genes involved in WNT/β-catenin signaling, including AXIN2 WNT10A, WNT10B, LRP6, and KREMEN1, are known to cause FTA. However, mutational interactions among these genes have not been fully explored. In this study, we characterized four FTA kindreds with LRP6 pathogenic mutations: p.(Gln1252*), p.(Met168Arg), p.(Ala754Pro), and p.(Asn1075Ser). The three missense mutations were predicted to cause structural destabilization of the LRP6 protein. Two probands carrying both an LRP6 mutant allele and a WNT10A variant exhibited more severe phenotypes, suggesting mutational synergism or digenic inheritance. Biallelic LRP6 mutations in a patient with many missing teeth further supported the dose-dependence of LRP6-associated FTA. Analysis of 21 FTA cases with 15 different LRP6 loss-of-function mutations revealed high heterogeneity of disease severity and a distinctive pattern of missing teeth, with maxillary canines being frequently affected. We hypothesized that various combinations of sequence variants in WNT-related genes can modulate WNT signaling activities during tooth development and cause a wide spectrum of tooth agenesis severity, which highlights the importance of exome/genome analysis for the genetic diagnosis of FTA in this era of precision medicine.
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Affiliation(s)
- Kuan-Yu Chu
- Department of Dentistry, School of Dentistry, National Taiwan University, Taipei City 100, Taiwan; (K.-Y.C.); (Y.-L.W.); (J.-T.C.); (Y.-P.W.)
- Department of Pediatric Dentistry, National Taiwan University Children’s Hospital, Taipei City 100, Taiwan
| | - Yin-Lin Wang
- Department of Dentistry, School of Dentistry, National Taiwan University, Taipei City 100, Taiwan; (K.-Y.C.); (Y.-L.W.); (J.-T.C.); (Y.-P.W.)
- Department of Pediatric Dentistry, National Taiwan University Children’s Hospital, Taipei City 100, Taiwan
| | - Yu-Ren Chou
- Graduate Institute of Biomedical Electronics and Bioinformatics, National Taiwan University, Taipei City 106, Taiwan;
| | - Jung-Tsu Chen
- Department of Dentistry, School of Dentistry, National Taiwan University, Taipei City 100, Taiwan; (K.-Y.C.); (Y.-L.W.); (J.-T.C.); (Y.-P.W.)
| | - Yi-Ping Wang
- Department of Dentistry, School of Dentistry, National Taiwan University, Taipei City 100, Taiwan; (K.-Y.C.); (Y.-L.W.); (J.-T.C.); (Y.-P.W.)
| | - James P. Simmer
- Department of Biologic and Materials Sciences, University of Michigan School of Dentistry, Ann Arbor, MI 48108, USA; (J.P.S.); (J.C.-C.H.)
| | - Jan C.-C. Hu
- Department of Biologic and Materials Sciences, University of Michigan School of Dentistry, Ann Arbor, MI 48108, USA; (J.P.S.); (J.C.-C.H.)
| | - Shih-Kai Wang
- Department of Dentistry, School of Dentistry, National Taiwan University, Taipei City 100, Taiwan; (K.-Y.C.); (Y.-L.W.); (J.-T.C.); (Y.-P.W.)
- Department of Pediatric Dentistry, National Taiwan University Children’s Hospital, Taipei City 100, Taiwan
- Correspondence: ; Tel.: +886-2-23123456 (ext. 70251)
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23
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Ahmed HA, El-Kamah GY, Rabie E, Mostafa MI, Abouzaid MR, Hassib NF, Mehrez MI, Abdel-Kader MA, Mohsen YH, Zada SK, Amr KS, Sayed ISM. Gene Mutations of the Three Ectodysplasin Pathway Key Players ( EDA, EDAR, and EDARADD) Account for More than 60% of Egyptian Ectodermal Dysplasia: A Report of Seven Novel Mutations. Genes (Basel) 2021; 12:1389. [PMID: 34573371 DOI: 10.3390/genes12091389] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Revised: 08/30/2021] [Accepted: 09/03/2021] [Indexed: 12/22/2022] Open
Abstract
Ectodermal dysplasia (ED) is a diverse group of genetic disorders caused by congenital defects of two or more ectodermal-derived body structures, namely, hair, teeth, nails, and some glands, e.g., sweat glands. Molecular pathogenesis of ED involves mutations of genes encoding key proteins of major developmental pathways, including ectodysplasin (EDA) and wingless-type (WNT) pathways. The most common ED phenotype is hypohidrotic/anhidrotic ectodermal dysplasia (HED) featuring hypotrichosis, hypohidrosis/anhidrosis, and hypodontia. Molecular diagnosis is fundamental for disease management and emerging treatments. We used targeted next generation sequencing to study EDA, EDAR, EDARADD, and WNT10A genes in 45 Egyptian ED patients with or without hypohidrosis. We present genotype and phenotype data of 28 molecularly-characterized patients demonstrating genetic heterogeneity, variable expressivity, and intrafamilial phenotypic variability. Thirteen mutations were reported, including four novel EDA mutations, two novel EDARADD, and one novel EDAR mutations. Identified mutations congregated in exons encoding key functional domains. EDA is the most common gene contributing to 85% of the identified Egyptian ED genetic spectrum, followed by EDARADD (10%) and EDAR (5%). Our cohort represents the first and largest cohort from North Africa where more than 60% of ED patients were identified emphasizing the need for exome sequencing to explore unidentified cases.
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24
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Krishnamurthy DM, Singh R, Mistry G. Interim three-dimensional printed overlay prosthesis for an adolescent patient with oligodontia. J Indian Prosthodont Soc 2021; 21:304-307. [PMID: 34380819 PMCID: PMC8425370 DOI: 10.4103/jips.jips_43_21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
Abstract
Oligodontia is a developmental anomaly which represents the congenital absence of more than six teeth in primary, permanent, or both dentitions and may or may not be associated with a syndrome. These patients suffer from occlusal disharmony, problems in speech and esthetic appearance. A multidisciplinary approach becomes mandatory to manage such patients to rehabilitate their oral function. Therefore, early diagnosis and treatment become important. This is a case report of a 15-year-old female patient with oligodontia, who was rehabilitated with removable overlay prostheses fabricated digitally, without modifying her existing dentition, to restore mastication, phonetics, and esthetics. Such an approach is essential for children who have not completed their growth. The monolithic three-dimensional (3D) printed denture has increased fracture resistance and higher wear resistance compared to conventional denture. It can also be easily adjusted, repaired and if required, reproduced. This article highlights the methodology, pros and cons of fabricating 3D printed dentures for such patients.
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Affiliation(s)
| | - Rajeev Singh
- Department of Prosthodontics, School of Dentistry, DY Patil University, Navi Mumbai, Maharashtra, India
| | - Gaurang Mistry
- Department of Prosthodontics, School of Dentistry, DY Patil University, Navi Mumbai, Maharashtra, India
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25
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Lee Y, Zhang H, Seymen F, Koruyucu M, Kasimoglu Y, Lee ZH, Hu JCC, Simmer JP, Kim JW. Novel homozygous KREMEN1 mutation causes ectodermal dysplasia. Oral Dis 2021; 28:843-845. [PMID: 34028942 DOI: 10.1111/odi.13921] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2020] [Revised: 05/03/2021] [Accepted: 05/09/2021] [Indexed: 11/29/2022]
Affiliation(s)
- Yejin Lee
- Department of Pediatric Dentistry, School of Dentistry & DRI, Seoul National University, Seoul, Korea
| | - Hong Zhang
- Department of Biologic and Materials Sciences, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - 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
| | - Zang Hee Lee
- Department of Cell and Developmental Biology, School of Dentistry & DRI, Seoul National University, Seoul, Korea
| | - Jan C-C Hu
- Department of Biologic and Materials Sciences, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - James P Simmer
- Department of Biologic and Materials Sciences, School of Dentistry, University of Michigan, Ann Arbor, MI, USA
| | - Jung-Wook Kim
- Department of Pediatric Dentistry, School of Dentistry & DRI, Seoul National University, Seoul, Korea.,Department of Molecular Genetics, School of Dentistry & DRI, Seoul National University, Seoul, Korea
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26
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Esquivel DA, Maestri R, Santana SE. Evolutionary implications of dental anomalies in bats. Evolution 2021; 75:1087-1096. [PMID: 33742462 DOI: 10.1111/evo.14211] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Revised: 02/05/2021] [Accepted: 02/17/2021] [Indexed: 01/17/2023]
Abstract
The gain or loss of anatomical features is an important mechanism of morphological evolution and ecological adaptation. Dental anomalies-the loss or gain of teeth-are widespread and a potential source of craniodental specialization among mammals, yet their macroevolutionary patterns have been rarely explored. We present the first phylogenetic comparative study of dental anomalies across the second largest mammal Order, Chiroptera (bats). We conducted an extensive literature review and surveyed a large sample of museum specimens to analyze the types and prevalence of dental anomalies across bats, and performed phylogenetic comparative analyses to investigate the role of phylogenetic history and dietary specialization on incidence of dental anomalies. We found dental anomalies have a significant phylogenetic signal, suggesting they are not simply the result of idiosyncratic mutations or random developmental disorders, but may have ancestral genetic origins or result from shared developmental pathways among closely related species. The incidence of dental anomalies was not associated with diet categories, suggesting no effect of craniodental specialization on dental anomalies across bats. Our results give insight into the macroevolutionary patterns of dental anomalies in bats, and provide a foundation for investigating new hypotheses underlying the evolution of dental variation and diversity in mammals.
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Affiliation(s)
- Diego A Esquivel
- Programa de Pós-Graduação em Biologia Animal, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, 91501-970, Brazil.,Fundación Kurupira, Bogotá, DC, 110921, Colombia
| | - Renan Maestri
- Department of Ecology, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, 91501-970, Brazil.,Negaunee Integrative Research Center, Field Museum of Natural History, Chicago, Illinois, 60605
| | - Sharlene E Santana
- Department of Biology, University of Washington, Seattle, Washington, 98195.,Burke Museum of Natural History and Culture, University of Washington, Seattle, Washington, 98195
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27
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Siddiqui HP, Sennimalai K, Samrit VD, Duggal R, Yadav R. Adjunctive orthodontic therapy for prosthetic rehabilitation in a growing child with Axenfeld-Rieger syndrome: A case report. Spec Care Dentist 2021; 41:423-430. [PMID: 33719126 DOI: 10.1111/scd.12579] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Revised: 01/28/2021] [Accepted: 02/05/2021] [Indexed: 11/28/2022]
Abstract
AIM The congenital oligodontia impeding the development of the alveolar process resulting in disproportionate jaw growth has been previously reported. This case report describes the interdisciplinary management of an 11-year-old girl with Axenfeld-Rieger syndrome exhibiting oligodontia and maxillary hypoplasia. METHODS AND RESULTS An adjunctive orthodontic therapy was performed by taking advantage of bone-anchored maxillary protraction (BAMP) therapy using miniplates and 24-hour traction by intermaxillary Class III elastics. After 6 months of active treatment, the maxilla advanced by approximately 5 mm and upper lip relation improved by 3 mm without any significant changes in vertical relations. All the changes were maintained at 15th-month follow-up. A temporary removable prosthesis was given for immediate esthetics, and the definitive management is discussed. CONCLUSION The BAMP therapy can be a befitting alternative in cases exhibiting complex presentation involving skeletal and dentoalveolar components. An appreciable profile improvement without any dentoalveolar side effects can be achieved with BAMP therapy.
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Affiliation(s)
- Hamza Parvez Siddiqui
- Division of Orthodontics and Dentofacial Deformities, Centre for Dental Education and Research, All India Institute of Medical Sciences, New Delhi, India
| | - Karthik Sennimalai
- Division of Orthodontics and Dentofacial Deformities, Centre for Dental Education and Research, All India Institute of Medical Sciences, New Delhi, India
| | - Vilas D Samrit
- Division of Orthodontics and Dentofacial Deformities, Centre for Dental Education and Research, All India Institute of Medical Sciences, New Delhi, India
| | - Ritu Duggal
- Division of Orthodontics and Dentofacial Deformities, Centre for Dental Education and Research, All India Institute of Medical Sciences, New Delhi, India
| | - Rahul Yadav
- Division of Oral and Maxillofacial Surgery, Centre for Dental Education and Research, All India Institute of Medical Sciences, New Delhi, India
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28
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O'Toole D, Häfliger IM, Leuthard F, Schumaker B, Steadman L, Murphy B, Drögemüller C, Leeb T. X-Linked Hypohidrotic Ectodermal Dysplasia in Crossbred Beef Cattle Due to a Large Deletion in EDA. Animals (Basel) 2021; 11:657. [PMID: 33801223 DOI: 10.3390/ani11030657] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Revised: 02/25/2021] [Accepted: 02/25/2021] [Indexed: 12/29/2022] Open
Abstract
Simple Summary Ectodermal dysplasias such as hypohidrotic ectodermal dysplasia (HED), are genetic conditions affecting the development and/or homeostasis of two or more ectodermal derivatives, including hair, teeth, nails, and eccrine glands. In particular, X-linked hypohidrotic ectodermal dysplasia-1 (ECTD1) in humans is characterized by a triad of signs comprising sparse hair, abnormal teeth, and anhidrosis or hypohidrosis. It has been reported in cattle, dogs, mice and rats. Until now, eight pathogenic variants in the bovine ectodysplasin A (EDA) gene causing ECTD1-like disorders have been found. Herein, five affected Red Angus-Simmental bull calves born over a 6-year period (2013–2019) in a single herd in the Western United States are reported showing an ECTD1-like syndrome. Calves were born with severe hypotrichosis and oligodontia. At age 1-week-old two calves died of severe pneumonia. Microscopic findings of the skin revealed small-caliber hair follicles with a mean density in flank skin slightly greater in affected animals than in control animals. Nasolabial, intranasal and tracheobronchial mucosal glands were absent, whereas olfactory glands were unaffected. Whole-genome sequencing (WGS) identified a 53 kb deletion of the X chromosome including parts of the EDA gene as well as the entire AWAT2 gene. The partial deletion of the EDA gene that is known to be associated with forms of ECTD1 is the most likely cause for the reported genodermatosis. Similar rare disorders in livestock are often not diagnosed at the molecular level due to lack of resources, short lifespan of the animals, and concerns for the producers’ reputation. Abstract X-linked hypohidrotic ectodermal dysplasia-1 (ECTD1) in people results in a spectrum of abnormalities, most importantly hypotrichosis, anodontia/oligodontia, and absent or defective ectodermally derived glands. Five Red Angus-Simmental calves born over a 6-year period demonstrated severe hypotrichosis and were diagnosed as affected with ECTD1-like syndrome. Two died of severe pneumonia within a week of birth. The skin of three affected calves revealed a predominance of histologically unremarkable small-caliber hair follicles. Larger follicles (>50 µm) containing medullated hairs (including guard and tactile hairs) were largely restricted to the muzzle, chin, tail, eyelids, tragus and distal portions of the limbs and tail. The mean histological density of hair follicles in flank skin of two affected calves was slightly greater than that in two unaffected calves. One affected calf was examined postmortem at 10 days of age to better characterize systemic lesions. Nasolabial, intranasal and tracheobronchial mucosal glands were absent, whereas olfactory glands were unaffected. Mandibular incisor teeth were absent. Premolar teeth were unerupted and widely spaced. Other than oligodontia, histological changes in teeth were modest, featuring multifocal disorganization of ameloblasts, new bone formation in dental alveoli, and small aggregates of osteodentin and cementum at the margins of the enamel organ. A 52,780 base pair deletion spanning six out of eight coding exons of EDA and all of AWAT2 was identified. Partial deletion of the EDA gene is the presumed basis for the reported X-chromosomal recessive inherited genodermatosis.
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29
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Bonczek O, Krejci P, Izakovicova-Holla L, Cernochova P, Kiss I, Vojtesek B. Tooth agenesis: What do we know and is there a connection to cancer? Clin Genet 2021; 99:493-502. [PMID: 33249565 DOI: 10.1111/cge.13892] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Revised: 11/17/2020] [Accepted: 11/26/2020] [Indexed: 12/22/2022]
Abstract
Like all developmental processes, odontogenesis is highly complex and dynamically regulated, with hundreds of genes co-expressed in reciprocal networks. Tooth agenesis (missing one or more/all teeth) is a common human craniofacial anomaly and may be caused by genetic variations and/or environmental factors. Variants in PAX9, MSX1, AXIN2, EDA, EDAR, and WNT10A genes are associated with tooth agenesis. Currently, variants in ATF1, DUSP10, CASC8, IRF6, KDF1, GREM2, LTBP3, and components and regulators of WNT signaling WNT10B, LRP6, DKK, and KREMEN1 are at the forefront of interest. Due to the interconnectedness of the signaling pathways of carcinogenesis and odontogenesis, tooth agenesis could be a suitable marker for early detection of cancer predisposition. Variants in genes associated with tooth agenesis could serve as prognostic or therapeutic targets in cancer. This review aims to summarize existing knowledge of development and clinical genetics of teeth. Concurrently, the review proposes possible approaches for future research in this area, with particular attention to roles in monitoring, early diagnosis and therapy of tumors associated with defective tooth development.
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Affiliation(s)
- Ondrej Bonczek
- Research Centre for Applied Molecular Oncology, Masaryk Memorial Cancer Institute, Brno, Czech Republic
| | - Premysl Krejci
- Institute of Dentistry and Oral Sciences, Faculty of Medicine and Dentistry, Palacky University, Olomouc, Czech Republic
| | - Lydie Izakovicova-Holla
- Department of Stomatology, Institution shared with St. Anne's University Hospital, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Pavlina Cernochova
- Department of Stomatology, Institution shared with St. Anne's University Hospital, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Igor Kiss
- Clinic of Comprehensive Cancer Care, Masaryk Memorial Cancer Institute, Brno, Czech Republic
| | - Borivoj Vojtesek
- Research Centre for Applied Molecular Oncology, Masaryk Memorial Cancer Institute, Brno, Czech Republic
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30
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Williams M, Zeng Y, Chiquet B, Jacob H, Kurtis Kasper F, Harrington DA, English J, Akyalcin S, Letra A. Functional characterization of ATF1, GREM2 AND WNT10B variants associated with tooth agenesis. Orthod Craniofac Res 2020; 24:486-493. [PMID: 33369218 DOI: 10.1111/ocr.12462] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Revised: 12/02/2020] [Accepted: 12/15/2020] [Indexed: 12/17/2022]
Abstract
OBJECTIVE To determine the functional effects of ATF1, WNT10B and GREM2 gene variants identified in individuals with tooth agenesis (TA). SETTINGS AND SAMPLE POPULATION Stem cells from human exfoliated deciduous teeth (SHED) were used as an in vitro model system to test the effect of TA-associated variants. MATERIALS AND METHODS Plasmid constructs containing reference and mutant alleles for ATF1 rs11169552, WNT10B rs833843 and GREM2 rs1414655 variants were transfected into SHED for functional characterization of variants. Allele-specific changes in gene transcription activity, protein expression, cell migration and proliferation, and expression of additional tooth development genes (MSX1, PAX9 and AXIN2) were evaluated. Data analyses were performed using Student's t-test. P-values ≤ .05 were considered statistically significant. RESULTS Mutant variants resulted in significantly decreased transcriptional activity of respective genes (P < 0.05), although no changes in protein localization were noted. Expression of MSX1 was significantly decreased in ATF1- and GREM2-mutant cells, whereas PAX9 or AXIN2 mRNA expression was not significantly altered. Mutant WNT10B had no significant effect on the expression of additional TA genes. ATF1- and GREM2-mutant cells presented increased cell migration. Cell proliferation was also affected with all three mutant alleles. CONCLUSIONS Our results demonstrate that ATF1, WNT10B and GREM2 mutant alleles have modulatory effects on gene/protein function that may contribute to TA.
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Affiliation(s)
- Meredith Williams
- Department of Orthodontics, University of Texas Health Science Center School of Dentistry, Houston, TX, USA
| | - Yu Zeng
- Department of Diagnostic and Biomedical Sciences, University of Texas Health Science Center School of Dentistry, Houston, TX, USA.,Center for Craniofacial Research, University of Texas Health Science Center School of Dentistry, Houston, TX, USA
| | - Brett Chiquet
- Center for Craniofacial Research, University of Texas Health Science Center School of Dentistry, Houston, TX, USA.,Department of Pediatric Dentistry, University of Texas Health Science Center School of Dentistry, Houston, TX, USA.,Pediatric Research Center, University of Texas Health Science Center McGovern Medical School, Houston, TX, USA
| | - Helder Jacob
- Department of Orthodontics, University of Texas Health Science Center School of Dentistry, Houston, TX, USA
| | - Fred Kurtis Kasper
- Department of Orthodontics, University of Texas Health Science Center School of Dentistry, Houston, TX, USA.,Center for Craniofacial Research, University of Texas Health Science Center School of Dentistry, Houston, TX, USA
| | - Daniel A Harrington
- Department of Diagnostic and Biomedical Sciences, University of Texas Health Science Center School of Dentistry, Houston, TX, USA.,Center for Craniofacial Research, University of Texas Health Science Center School of Dentistry, Houston, TX, USA
| | - Jeryl English
- Department of Orthodontics, University of Texas Health Science Center School of Dentistry, Houston, TX, USA
| | - Sercan Akyalcin
- Department of Orthodontics, Tufts University School of Dental Medicine, Boston, MA, USA
| | - Ariadne Letra
- Department of Diagnostic and Biomedical Sciences, University of Texas Health Science Center School of Dentistry, Houston, TX, USA.,Center for Craniofacial Research, University of Texas Health Science Center School of Dentistry, Houston, TX, USA.,Pediatric Research Center, University of Texas Health Science Center McGovern Medical School, Houston, TX, USA
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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: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [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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Abstract
Mutations in WNT10A have frequently been reported as etiologic for tooth agenesis (TA). However, the effects of WNT10A variation on gene/protein function and contribution to TA phenotypes remain poorly understood. Here, we performed bioinformatic and functional characterization analysis of WNT10A variants. In silico prediction of variant function was performed with VIPUR for all WNT10A missense variants reported in the Exome Aggregation Consortium database. Functional characterization experiments were then performed for selected WNT10A variants previously associated with TA. Expression vectors for wild-type and mutant WNT10A were made and transfected into stem cells from human exfoliated deciduous teeth (SHED) for evaluation of gene/protein function, WNT signaling activity, and effects on expression of relevant genes. While 75% of WNT10A variants were predicted neutral, most of the TA-associated variants received deleterious scores by potentially destabilizing or preventing the disulfide bond formation required for proper protein function. WNT signaling was significantly decreased with 8 of 13 variants tested, whereas wild-type-like activity was retained with 4 of 13 variants. WNT10A-mutant cells (T357I, R360C, and R379C mutants) showed reduced or impaired binding affinity to FZD5, suggesting a potential mechanism for the decreased WNT signaling. Mutant cells also had decreased WNT10A protein expression in comparison to wild-type cells. mRNA expression of PAX9, MSX1, AXIN2, and RUNX2 (known tooth development genes) was perturbed in mutant cells and quite significantly for PAX9 and RUNX2. Transcriptome analysis of wild-type and T357I-mutant cells identified 36 differentially expressed genes (26 downregulated, 10 upregulated) involved in skeletal system development and morphogenesis and pattern specification. WNT10A variants deemed pathogenic for TA likely affect protein folding and/or stabilization, leading to decreased WNT signaling and concomitant dysregulated expression of relevant genes. These findings may allow for improved interpretation of TA phenotypes upon clinical diagnosis while providing important insights toward the development of future tooth replacement therapies.
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Affiliation(s)
- Y Zeng
- Center for Craniofacial Research, School of Dentistry, University of Texas Health Science Center at Houston, Houston, TX, USA.,Department of Diagnostic and Biomedical Sciences, School of Dentistry, University of Texas Health Science Center at Houston, Houston, TX, USA
| | - E Baugh
- Department of Biology, New York University, New York, NY, USA
| | - S Akyalcin
- Department of Orthodontics, School of Dental Medicine, Tufts University, Houston, TX, USA
| | - A Letra
- Center for Craniofacial Research, School of Dentistry, University of Texas Health Science Center at Houston, Houston, TX, USA.,Department of Diagnostic and Biomedical Sciences, School of Dentistry, University of Texas Health Science Center at Houston, Houston, TX, USA.,Pediatric Research Center, McGovern Medical School, University of Texas Health Science Center at Houston, Houston, TX, USA
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Özdemir O, Övünç O, Yiğit Ö. Cleft Palate Patient With Conductive Hearing Loss Due to Stapes Fixation. Laryngoscope 2020; 131:E1279-E1281. [PMID: 32898284 DOI: 10.1002/lary.29076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2020] [Revised: 07/22/2020] [Accepted: 08/11/2020] [Indexed: 11/07/2022]
Abstract
Congenital stapes fixation is characterized by congenital conductive hearing loss that is not progressive. This rare disease may be accompanied by additional middle ear anomalies. However, the occurrence of congenital stapes fixation with cleft palate and oligodontia was described by Gorlin et al. in 1973, and no further cases have been reported in the literature. Congenital stapes fixation was detected after the exploratory tympanotomy operation performed on a 15-year-old male patient admitted to our clinic with hearing loss, more prominent on the left. The patient also had a previous operation due to cleft lip and had congenital deficiencies in the upper and lower teeth. We present the second case report in the literature which we think belongs to this syndrome, which is defined as cleft palate, stapes fixation, and oligodontia syndrome by Gorlin et al. Laryngoscope, 131:E1279-E1281, 2021.
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Affiliation(s)
- Ozan Özdemir
- Ear Nose Throat Department, University of Health Sciences, Istanbul Training and Research Hospital, Istanbul, Turkey
| | - Okan Övünç
- Ear Nose Throat Department, University of Health Sciences, Istanbul Training and Research Hospital, Istanbul, Turkey
| | - Özgür Yiğit
- Ear Nose Throat Department, University of Health Sciences, Istanbul Training and Research Hospital, Istanbul, Turkey
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Ergün SG, Tuncer BB, Ergün MA, Kolbaşı G, Orhan M, Perçin FE. Aetiological Evaluation of Oligodontia in a Three-Generation Family. Oral Health Prev Dent 2020; 18:271-275. [PMID: 32618450 DOI: 10.3290/j.ohpd.a44033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
PURPOSE The aim of this study was to assess the genetic evaluation of a three-generation consanguineous family with isolated oligodontia. MATERIALS AND METHODS A 16-year-old male patient who had been referred for orthodontic treatment due to the presence of oligodontia, and his family members who presented several missing teeth had been enrolled in the study. Clinical and radiological assessments and genetic analysis including whole-exome sequencing were performed. RESULTS Genetic evaluations revealed both homozygous and heterozygous mutations (c.T682A:p.F228I) in the WNT10A gene of six affected members of the family. Higher frequency of agenesis of mandibular second molar was found in homozygous relative to heterozygous WNT10A mutations. CONCLUSION The present findings have provided evidence for a known variant in the WNT10A gene in a three-generation consanguineous family with isolated oligodontia, while the results confirmed that cases with homozygous mutation revealed clinical heterogeneity.
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Quinzi V, Panetta G, Filippi P, Rizzo FA, Mancini L, Mummolo S. Autotransplatation of immature third molars as substitutes for congenitally missing second premolars: an alternative solution in a young patient with oligodontia. J BIOL REG HOMEOS AG 2020; 34:155-163. DENTAL SUPPLEMENT. [PMID: 32618173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Auto transplantation of immature donor teeth can be a strategic therapeutic solution in young patients. It is preferable to choose this approach instead of prosthetic restorations because it offers a unique and definitive solution. Orthodontic space closure is not always deemed desirable, especially in non-extraction cases (53,54). Successful auto transplantations allow alveolar growth through eruption of donor teeth together with the adjacent dentition when skeletal and dental development is not yet completed. Auto transplantation of third molars is less well-recognised and less documented. The available literature shows promising success rates. Immature donor teeth are reportedly associated with better outcomes than mature donor teeth. Aim of this case report was to analyse the short-term outcomes of auto transplantation of immature maxillary third molars to replace the missing mandibular second premolars in a 17-year-old healthy female with oligodontia. The surgical procedure was performed as a single step. Left and right lower second deciduous molars (7.5-8.5), close to exfoliation, were extracted. Donor upper third molars with developing root were extracted as a traumatically as possible and immediately placed into the surgically modified recipient sites. They were stabilized by a sectional wire. One year after surgery, the survival of both transplanted teeth was achieved. They showed periodontal health, normal mobility and continuation of root development during the follow-up period. The upper left third molar responded to all success criteria, no signs of ankylosis, root resorption (infection or inflammatory), and pulp necrosis. The upper right third molar had long-standing evidence of not progressive cervical external inflammatory root resorption without any clinical signs. Further research is needed to determine their long-term survival and success rates.
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Affiliation(s)
- V Quinzi
- Department of Life, Health and Environmental Sciences Postgraduate School of Orthodontics University of L'Aquila, L'Aquila 67100, Italy
| | - G Panetta
- Private Practice in Colleferro, Roma 00034, Italy
| | - P Filippi
- Private Practice in Bazzano, L'Aquila 67100, Italy
| | - F A Rizzo
- Department of Life, Health and Environmental Sciences Postgraduate School of Orthodontics University of L'Aquila, L'Aquila 67100, Italy
| | - L Mancini
- Department of Life, Health and Environmental Sciences, University of L'Aquila
| | - S Mummolo
- Department of Life, Health and Environmental Sciences Postgraduate School of Orthodontics University of L'Aquila, L'Aquila 67100, Italy
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Lévy J, Capri Y, Rachid M, Dupont C, Vermeesch JR, Devriendt K, Verloes A, Tabet AC, Bailleul-Forestier I. LEF1 haploinsufficiency causes ectodermal dysplasia. Clin Genet 2020; 97:595-600. [PMID: 32022899 DOI: 10.1111/cge.13714] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2019] [Revised: 01/28/2020] [Accepted: 01/30/2020] [Indexed: 11/30/2022]
Abstract
Ectodermal dysplasias are a family of genodermatoses commonly associated with variants in the ectodysplasin/NF-κB or the Wnt/β-catenin pathways. Both pathways are involved in signal transduction from ectoderm to mesenchyme during the development of ectoderm-derived structures. Wnt/β-catenin pathway requires the lymphoid enhancer-binding factor 1 (LEF1), a nuclear mediator, to activate target gene expression. In mice, targeted inactivation of the LEF1 gene results in a complete block of development of multiple ectodermal appendages. We report two unrelated patients with 4q25 de novo deletion encompassing LEF1, associated with severe oligodontia of primary and permanent dentition, hypotrichosis and hypohidrosis compatible with hypohidrotic ectodermal dysplasia. Taurodontism and a particular alveolar bone defect were also observed in both patients. So far, no pathogenic variants or variations involving the LEF1 gene have been reported in human. We provide further evidence for LEF1 haploinsufficiency role in ectodermal dysplasia and delineate its clinical phenotype.
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Affiliation(s)
- Jonathan Lévy
- Genetics Department, AP-HP, Robert-Debré University Hospital, Paris, France
| | - Yline Capri
- Genetics Department, AP-HP, Robert-Debré University Hospital, Paris, France
| | - Myriam Rachid
- Genetics Department, AP-HP, Robert-Debré University Hospital, Paris, France
| | - Céline Dupont
- Genetics Department, AP-HP, Robert-Debré University Hospital, Paris, France
| | - Joris R Vermeesch
- Department of Human Genetics, KU Leuven, Leuven, Belgium.,Center of Human Genetics, University Hospitals Leuven, Leuven, Belgium
| | - Koen Devriendt
- Department of Human Genetics, KU Leuven, Leuven, Belgium.,Center of Human Genetics, University Hospitals Leuven, Leuven, Belgium
| | - Alain Verloes
- Genetics Department, AP-HP, Robert-Debré University Hospital, Paris, France
| | - Anne-Claude Tabet
- Genetics Department, AP-HP, Robert-Debré University Hospital, Paris, France.,Neuroscience Department, Génétique Humaine et Fonction Cognitive Unit, Pasteur Institute, Paris, France
| | - Isabelle Bailleul-Forestier
- Department of Paediatric Dentistry, Rare Oral and Dental Competence Center, CHU Toulouse, Paul Sabatier University, Toulouse, France
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Abstract
BACKGROUND The meta-analysis of the data collected in the years 1939-1993 clearly shows an increasing incidence of hypodontia. The disorder is characterized by a congenital absence of deciduous or permanent teeth. It is a significant esthetical and functional problem, which may negatively affect the patient's psychosocial development. OBJECTIVES The aim of the study was to determine the scale of hypodontia using a sample of Polish orthodontic patients. MATERIAL AND METHODS The orthopantomograms and medical records of 674 patients aged 6-15 years (376 girls and 298 boys) were analyzed in order to identify dental agenesis. Deciduous and wisdom teeth were excluded from the study. Data regarding gender, the location of the disorder as well as the number and type of missing buds was recorded. RESULTS Hypodontia was found in 11.6% of the subjects (7.6% girls and 4% boys), more often in the mandible (44.9%) than in the maxilla (28.2%) or in both jaws (26.9%), and these differences were statistically significant (p = 0.096). The occurrence rates of uniand bilateral hypodontia were similar: 51.3% and 48.7%, respectively. The incidence of left-sided hypodontia (37.2%) significantly prevailed over rightsided hypodontia (14.1%) (p < 0.01). Tooth 35 was the most frequently missing one (13.5%). CONCLUSIONS The large discrepancy in hypodontia prevalence indicates that geographical differences and varying sample sizes greatly affect the results of studies. The literature lacks comprehensive studies regarding hypodontia in Poland. More studies with similar sample sizes and selection criteria need to be carried out. Through an early detection of hypodontia, it is possible to plan comprehensive, interdisciplinary treatment. Regardless of the discrepancies in the literature as to the exact location of the problem, hypodontia affects over 10% of the population of patients treated orthodontically, which justifies the need to study this issue.
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Affiliation(s)
- Zofia Kielan-Grabowska
- Division of Maxillofacial Orthopedics and Orthodontics, Department of Maxillofacial Orthopedics and Orthodontics, Wroclaw Medical University, Poland
| | - Beata Kawala
- Division of Maxillofacial Orthopedics and Orthodontics, Department of Maxillofacial Orthopedics and Orthodontics, Wroclaw Medical University, Poland
| | - Joanna Antoszewska-Smith
- Division of Maxillofacial Orthopedics and Orthodontics, Department of Maxillofacial Orthopedics and Orthodontics, Wroclaw Medical University, Poland
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Lin IP, Kumchai H, AlRejaye N, Sun AF, Drizen K, Liu JLJ. Interdisciplinary Approach to Treat Patients With Tooth Agenesis: A Case Report. Clin Adv Periodontics 2019; 9:34-46. [PMID: 31490036 DOI: 10.1002/cap.10029] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2017] [Revised: 02/27/2018] [Accepted: 03/06/2018] [Indexed: 11/09/2022]
Abstract
INTRODUCTION Tooth agenesis is a type of dental anomaly in which individuals are missing teeth due to developmental failure as a result of genetic or environmental factors. With approximately one fourth of the population missing ≥1 third molar, tooth agenesis is considered a common dental anomaly. However, the severity of tooth agenesis can range from a missing single tooth to multiple teeth. When suffering from severe tooth agenesis, the patient's health and social relationships are often affected. CASE PRESENTATION The patient in this report congenitally lost 11 teeth and suffered from compromised esthetics and impaired chewing function. In such a severe tooth agenesis case, interdisciplinary treatments involving orthodontics, periodontics, and prosthodontics were engaged to reconstruct the ideal biology, function, and esthetics for the patient. With an interdisciplinary approach, the periodontist played an important role in the rehabilitation of the edentulous regions with implants in combination with various hard and soft tissue augmentation procedures. In addition, the patient with severe tooth agenesis presented with additional dental anomalies. The periodontist, therefore, had to collaborate with other specialists to provide early detection and intervention to avoid future complications, such as the management of infraoccluded ankylosed deciduous molars and aberrant frenum. The patient at the end of treatment had a good occlusion with improved function and esthetics. CONCLUSION This case report describes the interdisciplinary treatment approach used and points out the role of periodontists in the treatment of a patient with severe tooth agenesis.
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Affiliation(s)
- I Ping Lin
- Department of Periodontology, National Taiwan University Hospital Hsin-Chu Branch, Hsinchu, Taiwan
| | | | - Najla AlRejaye
- Department of Orthodontics, King Abdulaziz Medical City, Riyadh, Saudi Arabia
| | - Arthur F Sun
- Department of Restorative Sciences & Biomaterials, Boston University Goldman School of Dental Medicine, Boston, MA
| | - Kenneth Drizen
- Department of Orthodontics & Dentofacial Orthopedics, Boston University Goldman School of Dental Medicine
| | - Jess Li-Je Liu
- Department of Periodontology, Boston University Goldman School of Dental Medicine
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Filius MAP, Cune MS, Créton M, Vissink A, Raghoebar GM, Visser A. Oral Health-Related Quality of Life in Dutch Children Diagnosed with Oligodontia. A Cross-Sectional Study. Int J Environ Res Public Health 2019; 16:E2371. [PMID: 31277355 DOI: 10.3390/ijerph16132371] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 06/03/2019] [Revised: 06/29/2019] [Accepted: 07/02/2019] [Indexed: 11/25/2022]
Abstract
There is need to get insight into condition-specific oral health-related quality of life in Dutch children with oligodontia. Between October 2014 and March 2017, 11–17-year-old oligodontia patients were approached to join a study assessing the impact of oligodontia on condition-specific oral health-related quality of life (OHrQoL). The patients received a condition-specific OHrQoL questionnaire prior to the start of orthodontic treatment. Non-oligodontia children in the same age group, but also requiring orthodontic treatment, were approached to serve as a control. The Fisher’s Exact Test was used for comparison purposes with the control group because of the small group sizes. Furthermore, subgroup analyses were performed for gender, age, number of congenitally missing teeth, tooth agenesis in the aesthetic region, orthodontic classification and microdontia via independent t-tests. p-values of <0.05 were considered statistically significant. Twenty-eight oligodontia patients and 23 controls agreed to participate. The oligodontia patients’ scores were comparable to the controls except for the items about dental appearance and treatment complexity. The impact of oligodontia on OHrQoL in youngsters is limited and mainly concerns dental appearance and the complexity of the treatment.
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Ross J, Fennis W, de Leeuw N, Cune M, Willemze A, Rosenberg A, Ploos van Amstel H, Créton M, van den Boogaard M. Concurrent manifestation of oligodontia and thrombocytopenia caused by a contiguous gene deletion in 12p13.2: A three-generation clinical report. Mol Genet Genomic Med 2019; 7:e679. [PMID: 30950205 PMCID: PMC6565550 DOI: 10.1002/mgg3.679] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Accepted: 03/06/2019] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND Wnt and Wnt-associated pathways play an important role in the genetic etiology of oligodontia, a severe form of tooth agenesis. Loss-of-function mutations in LRP6 , encoding a transmembrane cell-surface protein that functions as a coreceptor in the canonical Wnt/b-catenin signaling cascade, also contribute to genetic oligodontia. METHODS AND RESULTS We describe a three-generation family with hereditary thrombocytopenia and oligodontia. Genome wide array analysis was performed. The array results from the index patient revealed an interstitial loss of 150 kb in 8p23.1 (chr8:6,270,299-6,422,558; hg19) encompassing MCPH1 and ANGPT2 and an interstitial loss of 290 kb in 12p13.2 (chr12:12,005,720-12,295,290; hg19) encompassing ETV6, BCL2L14 and LRP6. CONCLUSION This case report shows a three-generation family with hereditary thrombocytopenia and oligodontia with a heterozygous 290 kb novel contiguous gene deletion in band p13.2 of chromosome 12, encompassing LRP6 and ETV6. In this report we discuss the clinical relevance of the deletion of both genes and illustrate the importance of thorough examination of oligodontia patients. Comprising not only the oral status but also the medical history of the patients and their relatives.
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Affiliation(s)
- Jamila Ross
- Department of Oral‐Maxillofacial Surgery, Prosthodontics and Special Dental CareUniversity Medical Center UtrechtUtrechtthe Netherlands
| | - Willem Fennis
- Department of Oral‐Maxillofacial Surgery, Prosthodontics and Special Dental CareUniversity Medical Center UtrechtUtrechtthe Netherlands
| | - Nicole de Leeuw
- Department of Human GeneticsRadboud University Medical CenterNijmegenthe Netherlands
| | - Marco Cune
- Department of Oral‐Maxillofacial Surgery, Prosthodontics and Special Dental CareUniversity Medical Center UtrechtUtrechtthe Netherlands
- Center for Dentistry and Oral Hygiene, Department of Fixed and Removable Prosthodontics and BiomaterialsUniversity Medical Center GroningenGroningenthe Netherlands
- Department of Oral‐Maxillofacial Surgery, Prosthodontics and Special Dental CareSt. Antonius Hospital NieuwegeinNieuwegeinthe Netherlands
| | - Annemieke Willemze
- Department of HematologyUniversity Medical Center UtrechtUtrechtthe Netherlands
| | - Antoine Rosenberg
- Department of Oral‐Maxillofacial Surgery, Prosthodontics and Special Dental CareUniversity Medical Center UtrechtUtrechtthe Netherlands
| | | | - Marijn Créton
- Department of Oral‐Maxillofacial Surgery, Prosthodontics and Special Dental CareUniversity Medical Center UtrechtUtrechtthe Netherlands
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Wiener RC, Waters C. Hypodontia, Oligodontia and Anodontia in West Virginia Appalachia. J Dent Hyg 2019; 93:34-40. [PMID: 31015306] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 07/25/2018] [Accepted: 11/13/2018] [Indexed: 06/09/2023]
Abstract
Purpose: Children in West Virginia have a high prevalence of missing permanent teeth when compared to children in the rest of the nation. The purpose of this study is to determine the prevalence of permanent tooth hypodontia/oligodontia/anodontia in West Virginia children and to compare the prevalence by sex.Methods: Five hundred panoramic radiographs of West Virginia children, ages 6-11 years, were examined for missing permanent tooth buds/permanent teeth. Data analyses included frequency determinations, Chi square analyses, and logistic regression.Results: Sixty children (12.0%, n=500) had at least one missing permanent tooth bud/permanent tooth. There were 15.5% of females and 8.8% of males who had at least one missing permanent tooth bud/permanent tooth. In adjusted logistic regression on at least one missing permanent tooth bud/permanent tooth, females had an adjusted odds ratio of 2.11 [95% Confidence Interval: 1.18, 3.75; p = .011] compared with males. Other variables in the analysis failed to reach significance.Conclusion: In this sample of West Virginia children, females were more likely to have at least one missing permanent tooth bud/permanent tooth compared to males. Early recognition and treatment planning for dental care is needed for children with hypodontia/oligodontia/anodontia.
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Moura E, Rotenberg IS, Pimpão CT. X-Linked Hypohidrotic Ectodermal Dysplasia-General Features and Dental Abnormalities in Affected Dogs Compared With Human Dental Abnormalities. Top Companion Anim Med 2019; 35:11-17. [PMID: 31122682 DOI: 10.1053/j.tcam.2019.03.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Revised: 03/06/2019] [Accepted: 03/06/2019] [Indexed: 11/11/2022]
Abstract
X-linked hypohidrotic ectodermal dysplasia (XLHED) is a genetic disorder characterized by abnormalities in ectodermal derivatives such as sweat glands, hair, and teeth. In animals, the highest number of cases has been reported in dogs, which show characteristic congenital alopecia and develop abnormalities in the shape and number of teeth. Although the clinical phenotype of the affected individuals is typical, this disorder remains almost unknown in veterinary clinical practice. With the aim of making it better known, we gathered in this review the main clinical and genetic aspects of XLHED, placing emphasis on dental abnormalities.
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Affiliation(s)
- Enio Moura
- Service of Medical Genetics, Course of Veterinary Medicine, School of Life Sciences, Pontifícia Universidade Católica do Paraná (PUCPR), Curitiba, PR, Brazil.
| | - Isabel S Rotenberg
- Course of Veterinary Medicine, Pontifícia Universidade Católica do Paraná (PUCPR), Curitiba, PR, Brazil
| | - Cláudia T Pimpão
- Department of Animal Science, School of Life Sciences, Pontifícia Universidade Católica do Paraná (PUCPR), Curitiba, PR, Brazil
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43
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De Santis D, Pancera P, Sinigaglia S, Faccioni P, Bertossi D, Luciano U, Zotti F, Kumar N, Donadello D, Manuelli M, Lucchese A, Tacchino U, Ricciardi G, Nocini R, Albanese M. Tooth agenesis: part 2. Orthodontic treatment and prosthetic possibilities. J BIOL REG HOMEOS AG 2019; 33:23-28. [PMID: 30966729] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Dental agenesis has a great clinical significance due to its frequency during daily practice and the therapeutic problems that can arise from it. This paper will explore all the aspects to consider in order creating a proper multidisciplinary treatment plan: in particular, orthodontic, prosthetic and implantologic therapeutic alternatives are described for the rehabilitation of the different areas of the dental arches. In fact, dental agenesis is a problem that often requires the intervention of specialists from the different fields of dentistry and its treatment must meet aesthetics needs, stomatognathic function and patient satisfaction.
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Affiliation(s)
- D De Santis
- Section of Oral and Maxillofacial Surgery; Department of Surgical Sciences, Dentistry, Gynecology and Pediatrics, University of Verona, Verona, Italy
| | - P Pancera
- Section of Oral and Maxillofacial Surgery, Department of Surgical Sciences, Dentistry, Gynecology and Pediatrics, University of Verona, Verona, Italy
| | - S Sinigaglia
- Section of Oral and Maxillofacial Surgery, Department of Surgical Sciences, Dentistry, Gynecology and Pediatrics, University of Verona, Verona, Italy
| | - P Faccioni
- DSection of Oral and Maxillofacial Surgery, Department of Surgical Sciences, Dentistry, Gynecology and Pediatrics, University of Verona, Verona, Italy
| | - D Bertossi
- Section of Oral and Maxillofacial Surgery, Department of Surgical Sciences, Dentistry, Gynecology and Pediatrics, University of Verona, Verona, Italy
| | - U Luciano
- Section of Oral and Maxillofacial Surgery, Department of Surgical Sciences, Dentistry, Gynecology and Pediatrics, University of Verona, Verona, Italy
| | - F Zotti
- Section of Oral and Maxillofacial Surgery, Department of Surgical Sciences, Dentistry, Gynecology and Pediatrics, University of Verona, Verona, Italy
| | - N Kumar
- Postgraduate Medical Institute, Faculty of Medical Science, Anglia Ruskin University, Chelmsford, UK
| | - D Donadello
- Section of Oral and Maxillofacial Surgery, Department of Surgical Sciences, Dentistry, Gynecology and Pediatrics, University of Verona, Verona, Italy
| | - M Manuelli
- School of Dentistry, Department of Orthodontics, Vita-Salute San Raffaele University, Milan, Italy
- Unit of Dentistry, Division of Orthodontics, Research area in Dentofacial Orthopedics and Orthodontics, IRCCS San Raffaele Scientific Institute, Milan, Italy
- Private Practice in Milan, Italy
| | - A Lucchese
- School of Dentistry, Department of Orthodontics, Vita-Salute San Raffaele University, Milan, Italy
- Unit of Dentistry, Division of Orthodontics, Research area in Dentofacial Orthopedics and Orthodontics, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - U Tacchino
- School of Dentistry, Department of Orthodontics, Vita-Salute San Raffaele University, Milan, Italy
- Unit of Dentistry, Division of Orthodontics, Research area in Dentofacial Orthopedics and Orthodontics, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - G Ricciardi
- Section of Oral and Maxillofacial Surgery, Department of Surgical Sciences, Dentistry, Gynecology and Pediatrics, University of Verona, Verona, Italy
| | - R Nocini
- Section of ENT, Department of Surgical Sciences, Dentistry, Gynecology and Pediatrics, University of Verona, Verona, Italy
| | - M Albanese
- Section of Oral and Maxillofacial Surgery, Department of Surgical Sciences, Dentistry, Gynecology and Pediatrics, University of Verona, Verona, Italy
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De Santis D, Pancera P, Sinigaglia S, Faccioni P, Albanese M, Bertossi D, Luciano U, Zotti F, Matarese M, Lucchese A, Croce S, Donadello D, Ricciardi G, Kumar N, Nocini R, Nocini PF. Tooth agenesis: part 1. Incidence and diagnosis in orthodontics. J BIOL REG HOMEOS AG 2019; 33:19-22. [PMID: 30759978] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Dental agenesis has a great clinical significance due to its frequency during daily practice and the therapeutic problems that can arise from it. This paper will explore the incidence of dental agenesis, its diagnosis and how this anomaly affects the teeth differently. The second subsequent paper will look at its treatment and management.
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Affiliation(s)
- D De Santis
- Section of Oral and Maxillofacial Surgery, Department of Surgical Sciences, Dentistry, Gynecology and Pediatrics, University of Verona, Verona, Italy
| | - P Pancera
- Section of Oral and Maxillofacial Surgery, Department of Surgical Sciences, Dentistry, Gynecology and Pediatrics, University of Verona, Verona, Italy
| | - S Sinigaglia
- Section of Oral and Maxillofacial Surgery, Department of Surgical Sciences, Dentistry, Gynecology and Pediatrics, University of Verona, Verona, Italy
| | - P Faccioni
- Section of Oral and Maxillofacial Surgery, Department of Surgical Sciences, Dentistry, Gynecology and Pediatrics, University of Verona, Verona, Italy
| | - M Albanese
- Section of Oral and Maxillofacial Surgery, Department of Surgical Sciences, Dentistry, Gynecology and Pediatrics, University of Verona, Verona, Italy
| | - D Bertossi
- Section of Oral and Maxillofacial Surgery, Department of Surgical Sciences, Dentistry, Gynecology and Pediatrics, University of Verona, Verona, Italy
| | - U Luciano
- Section of Oral and Maxillofacial Surgery, Department of Surgical Sciences, Dentistry, Gynecology and Pediatrics, University of Verona, Verona, Italy
| | - F Zotti
- Section of Oral and Maxillofacial Surgery, Department of Surgical Sciences, Dentistry, Gynecology and Pediatrics, University of Verona, Verona, Italy
| | - M Matarese
- Department of Biomedical, Odontostomatological Sciences and of Morphological and Functional Images, School of Dentistry, University of Messina, AOU Policlinico “G. Martino”, Messina, Italy
| | - A Lucchese
- School of Dentistry, Department of Orthodontics, Vita-Salute San Raffaele University, Milan, Italy
- Unit of Dentistry, Division of Orthodontics, Research area in Dentofacial Orthopedics and Orthodontics, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - S Croce
- School of Dentistry, Department of Orthodontics, Vita-Salute San Raffaele University, Milan, Italy
- Unit of Dentistry, Division of Orthodontics, Research area in Dentofacial Orthopedics and Orthodontics, IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - D Donadello
- Section of Oral and Maxillofacial Surgery, Department of Surgical Sciences, Dentistry, Gynecology and Pediatrics, University of Verona, Verona, Italy
| | - G Ricciardi
- Section of Oral and Maxillofacial Surgery, Department of Surgical Sciences, Dentistry, Gynecology and Pediatrics, University of Verona, Verona, Italy
| | - N Kumar
- Postgraduate Medical Institute, Faculty of Medical Science, Anglia Ruskin University, Chelmsford, UK
| | - R Nocini
- Section of ENT, Department of Surgical Sciences, Dentistry, Gynecology and Pediatrics, University of Verona, Verona, Italy
| | - P F Nocini
- Section of Oral and Maxillofacial Surgery, Department of Surgical Sciences, Dentistry, Gynecology and Pediatrics, University of Verona, Verona, Italy
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45
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Ge YJ, Yeh IT, Wong SW, Han D, Feng HL. Occlusal Rehabilitation in a Patient with Oligodontia and Microdontia using Implants and Full-Ceramic Restorations: A Clinical Report. Chin J Dent Res 2019; 22:281-285. [PMID: 31859288 DOI: 10.3290/j.cjdr.a43739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Oligodontia is the agenesis of six or more permanent teeth, excluding the third molars. Multidisciplinary dental treatments should be performed sequentially due to the restoration requirements for good oral function, aesthetics and self-confidence of patients. In this study, we report a case using dental implants and full-ceramic prostheses to restore the absent and malformed teeth in a patient with agenesis of 18 permanent teeth and with some primary teeth retained. The dental sequential treatments began when she was 16 years old, and she wore removable partial dentures for 4 years with unsatisfying restoration outcome. When she became an adult, dental implants and full-ceramic prostheses were used to restore the absent and malformed teeth. Finally, the patient was very satisfied with the functional and aesthetic outcomes of the prosthetic treatment.
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46
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Zhao K, Lian M, Zou D, Huang W, Zhou W, Shen Y, Wang F, Wu Y. Novel mutations identified in patients with tooth agenesis by whole-exome sequencing. Oral Dis 2018; 25:523-534. [PMID: 30417976 DOI: 10.1111/odi.13002] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2018] [Revised: 10/27/2018] [Accepted: 11/05/2018] [Indexed: 11/29/2022]
Abstract
OBJECTIVES To identify potentially pathogenic mutations for tooth agenesis by whole-exome sequencing. SUBJECTS AND METHODS Ten Chinese families including five families with ectodermal dysplasia (syndromic tooth agenesis) and five families with selective tooth agenesis were included. Whole-exome sequencing was performed using genomic DNA. Potentially pathogenic mutations were identified after data filtering and screening. The pathogenicity of novel variants was investigated by segregation analysis, in silico analysis, and functional studies. RESULTS One novel mutation (c.441_442insACTCT) and three reported mutations (c.252delT, c.463C>T, and c.1013C>T) in EDA were identified in families with ectodermal dysplasia. The novel EDA mutation was co-segregated with phenotype. A functional study revealed that NF-κB activation was compromised by the identified mutations. The secretion of active EDA was also compromised detection by western blotting. Novel Wnt10A mutations (c.521T>C and c.653T>G) and EVC2 mutation (c.1472C>T) were identified in families with selective tooth agenesis. The Wnt10A c.521T>C mutation and the EVC2 c.1472C>T mutation were considered as pathogenic for affecting highly conserved amino acids, co-segregated with phenotype and predicted to be disease-causing by SIFT and PolyPhen2. Moreover, several reported mutations in PAX9, Wnt10A, and FGFR3 were also detected. CONCLUSIONS Our study expanded our knowledge on tooth agenesis spectrum by identifying novel variants.
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Affiliation(s)
- Kai Zhao
- Second Dental Clinic, Department of Oral Implantology, Ninth People's Hospital, School of Medicine, Shanghai Key Laboratory of Stomatology, National Clinical Research Center of Stomatology, Shanghai Jiao Tong University, Shanghai, China
| | - Meifei Lian
- Department of Prosthodontics, Shanghai Ninth People's Hospital Affiliated with Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Duohong Zou
- Department of Oral Surgery, Ninth People's Hospital, School of Medicine, Shanghai Key Laboratory of Stomatology, National Clinical Research Center of Stomatology, Shanghai Jiao Tong University, Shanghai, China
| | - Wei Huang
- Department of Oral Implantology, Ninth People's Hospital, School of Medicine, Shanghai Key Laboratory of Stomatology, National Clinical Research Center of Stomatology, Shanghai Jiao Tong University, Shanghai, China
| | - Wenjie Zhou
- Second Dental Clinic, Ninth People's Hospital, School of Medicine, Shanghai Key Laboratory of Stomatology, National Clinical Research Center of Stomatology, Shanghai Jiao Tong University, Shanghai, China
| | - Yihan Shen
- Second Dental Clinic, Ninth People's Hospital, School of Medicine, Shanghai Key Laboratory of Stomatology, National Clinical Research Center of Stomatology, Shanghai Jiao Tong University, Shanghai, China
| | - Feng Wang
- Department of Oral Implantology, Ninth People's Hospital, School of Medicine, Shanghai Key Laboratory of Stomatology, National Clinical Research Center of Stomatology, Shanghai Jiao Tong University, Shanghai, China
| | - Yiqun Wu
- Second Dental Clinic, Department of Oral Implantology, Ninth People's Hospital, School of Medicine, Shanghai Key Laboratory of Stomatology, National Clinical Research Center of Stomatology, Shanghai Jiao Tong University, Shanghai, China
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47
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Yu M, Wong SW, Han D, Cai T. Genetic analysis: Wnt and other pathways in nonsyndromic tooth agenesis. Oral Dis 2018; 25:646-651. [PMID: 29969831 DOI: 10.1111/odi.12931] [Citation(s) in RCA: 82] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2018] [Revised: 06/26/2018] [Accepted: 06/27/2018] [Indexed: 12/29/2022]
Abstract
Tooth agenesis (TA) is one of the most common developmental anomalies that affects the number of teeth. An extensive analysis of publicly accessible databases revealed 15 causative genes responsible for nonsyndromic TA, along with their signaling pathways in Wnt/β-catenin, TGF-β/BMP, and Eda/Edar/NF-κB. However, genotype-phenotype correlation analysis showed that most of the causal genes are also responsible for syndromic TA or other conditions. In a total of 198 different mutations of the 15 genes responsible for nonsyndromic TA, 182 mutations (91.9%) are derived from seven genes (AXIN2, EDA, LRP6, MSX1, PAX9, WNT10A, and WNT10B) compared with the remaining 16 mutations (8.1%) identified in the remaining eight genes (BMP4, DKK1, EDAR, EDARADD, GREM2, KREMEN1, LTBP3, and SMOC2). Furthermore, specificity analysis in terms of the ratio of nonsyndromic TA mutations versus syndromic mutations in each of the aforementioned seven genes showed a 98.2% specificity rate in PAX9, 58.9% in WNT10A, 56.6% in MSX1, 41.2% in WNT10B, 31.4% in LRP6, 23.8% in AXIN2%, and 8.4% in EDA. These findings underscore an important role of the Wnt and Wnt-associated pathways in the genetic etiology of this heterozygous disease and shed new lights on the discovery of novel molecular mechanisms associated with tooth agenesis.
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Affiliation(s)
- Miao Yu
- 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
| | - Sing-Wai Wong
- Oral and Craniofacial Biomedicine Curriculum, School of Dentistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina.,Immunity, Inflammation, and Disease Laboratory, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina
| | - Dong Han
- 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
| | - Tao Cai
- National Institute of Dental and Craniofacial Research, NIH, Bethesda, Maryland
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48
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Schnabl D, Grunert I, Schmuth M, Kapferer-Seebacher I. Prosthetic rehabilitation of patients with hypohidrotic ectodermal dysplasia: A systematic review. J Oral Rehabil 2018; 45:555-570. [PMID: 29679503 DOI: 10.1111/joor.12638] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/16/2018] [Indexed: 11/26/2022]
Abstract
Hypohidrotic ectodermal dysplasia (HED) comprises a large group of inherited disorders of ectodermal structures, characterised by hypo- or anhidrosis, hypotrichosis and hypo- or oligo- or anodontia. We aimed to systematically assess the spectrum of prosthodontic approaches with regard to the patients' age and to provide clinical implications for practicing dentists. An electronic and manual search was conducted in four databases (Medline, LIVIVO, Cochrane Library, Web of Science Core Collection). Publications of multiple study designs written in English or German without data restrictions, reporting on prosthodontic treatment of patients diagnosed with HED and afflicted with oligo- or anodontia, were included. In total, 75 articles on 146 patients were analysed according to the patients' age. In children aged 2-17 years, removable full or partial (over)dentures represented standard treatment. In the mandible, implant-supported removable dentures on two interforaminal implants presented an alternative, already in young childhood. In cases with more than six teeth per jaw, also fixed (resin) bridges were used, frequently after orthodontic treatment. In adults, fixed or removable reconstructions with the help of up to eight implants per jaw, usually placed after bone augmentation procedures, were standard. Ten case reports/series with long-term follow-up illustrated the need for consistent maintenance including denture renewals. Prosthodontic rehabilitation should start in early childhood and needs to be revised in accordance with the patients' growth. Treatment should be carried out by a multidisciplinary team addressing variable demands in different age groups.
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Affiliation(s)
- D Schnabl
- University Hospital for Dental Prosthetics and Restorative Dentistry, Medical University of Innsbruck, Innsbruck, Austria
| | - I Grunert
- University Hospital for Dental Prosthetics and Restorative Dentistry, Medical University of Innsbruck, Innsbruck, Austria
| | - M Schmuth
- Department of Dermatology, Venereology and Allergology, Medical University of Innsbruck, Innsbruck, Austria
| | - I Kapferer-Seebacher
- University Hospital for Dental Prosthetics and Restorative Dentistry, Medical University of Innsbruck, Innsbruck, Austria
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49
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Jonsson L, Magnusson TE, Thordarson A, Jonsson T, Geller F, Feenstra B, Melbye M, Nohr EA, Vucic S, Dhamo B, Rivadeneira F, Ongkosuwito EM, Wolvius EB, Leslie EJ, Marazita ML, Howe BJ, Moreno Uribe LM, Alonso I, Santos M, Pinho T, Jonsson R, Audolfsson G, Gudmundsson L, Nawaz MS, Olafsson S, Gustafsson O, Ingason A, Unnsteinsdottir U, Bjornsdottir G, Walters GB, Zervas M, Oddsson A, Gudbjartsson DF, Steinberg S, Stefansson H, Stefansson K. Rare and Common Variants Conferring Risk of Tooth Agenesis. J Dent Res 2018; 97:515-522. [PMID: 29364747 DOI: 10.1177/0022034517750109] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
We present association results from a large genome-wide association study of tooth agenesis (TA) as well as selective TA, including 1,944 subjects with congenitally missing teeth, excluding third molars, and 338,554 controls, all of European ancestry. We also tested the association of previously identified risk variants, for timing of tooth eruption and orofacial clefts, with TA. We report associations between TA and 9 novel risk variants. Five of these variants associate with selective TA, including a variant conferring risk of orofacial clefts. These results contribute to a deeper understanding of the genetic architecture of tooth development and disease. The few variants previously associated with TA were uncovered through candidate gene studies guided by mouse knockouts. Knowing the etiology and clinical features of TA is important for planning oral rehabilitation that often involves an interdisciplinary approach.
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Affiliation(s)
- L Jonsson
- 1 deCODE genetics/Amgen, Reykjavik, Iceland.,2 Department of Pharmacology, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - T E Magnusson
- 3 Faculty of Odontology, University of Iceland, Reykjavík, Iceland
| | - A Thordarson
- 3 Faculty of Odontology, University of Iceland, Reykjavík, Iceland
| | - T Jonsson
- 3 Faculty of Odontology, University of Iceland, Reykjavík, Iceland
| | - F Geller
- 4 Department of Epidemiology Research, Statens Serum Institut, Copenhagen, Denmark
| | - B Feenstra
- 4 Department of Epidemiology Research, Statens Serum Institut, Copenhagen, Denmark
| | - M Melbye
- 4 Department of Epidemiology Research, Statens Serum Institut, Copenhagen, Denmark.,5 Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark.,6 Department of Medicine, School of Medicine, Stanford University, Stanford, California, USA
| | - E A Nohr
- 7 Research Unit for Gynaecology and Obstetrics, Department of Clinical Research, University of Southern Denmark, Odense, Denmark
| | - S Vucic
- 8 Department of Oral and Maxillofacial Surgery, Special Dental Care and Orthodontics, Erasmus University Medical Centre, Rotterdam, The Netherlands.,9 Generation R Study Group, Erasmus University Medical Centre, Rotterdam, The Netherlands
| | - B Dhamo
- 8 Department of Oral and Maxillofacial Surgery, Special Dental Care and Orthodontics, Erasmus University Medical Centre, Rotterdam, The Netherlands.,9 Generation R Study Group, Erasmus University Medical Centre, Rotterdam, The Netherlands
| | - F Rivadeneira
- 9 Generation R Study Group, Erasmus University Medical Centre, Rotterdam, The Netherlands.,10 Department of Epidemiology, Erasmus University Medical Center, Rotterdam, The Netherlands.,11 Department of Internal Medicine, Erasmus University Medical Centre, Rotterdam, The Netherlands
| | - E M Ongkosuwito
- 8 Department of Oral and Maxillofacial Surgery, Special Dental Care and Orthodontics, Erasmus University Medical Centre, Rotterdam, The Netherlands.,9 Generation R Study Group, Erasmus University Medical Centre, Rotterdam, The Netherlands
| | - E B Wolvius
- 8 Department of Oral and Maxillofacial Surgery, Special Dental Care and Orthodontics, Erasmus University Medical Centre, Rotterdam, The Netherlands.,9 Generation R Study Group, Erasmus University Medical Centre, Rotterdam, The Netherlands
| | - E J Leslie
- 12 Department of Oral Biology, Center for Craniofacial and Dental Genetics, School of Dental Medicine, University of Pittsburgh, Pittsburgh, PA, USA.,13 Department of Human Genetics, Emory University School of Medicine, Atlanta, GA, USA
| | - M L Marazita
- 12 Department of Oral Biology, Center for Craniofacial and Dental Genetics, School of Dental Medicine, University of Pittsburgh, Pittsburgh, PA, USA.,14 Department of Human Genetics, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, PA, USA.,15 Clinical and Translational Science, School of Medicine, University of Pittsburgh, Pittsburgh, PA, USA
| | - B J Howe
- 16 Department of Family Dentistry, College of Dentistry, University of Iowa, Iowa City, IA, USA
| | - L M Moreno Uribe
- 16 Department of Family Dentistry, College of Dentistry, University of Iowa, Iowa City, IA, USA
| | - I Alonso
- 17 i3S, Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Porto, Portugal.,18 UnIGENe, Instituto Biologia Molecular Celular, Universidade do Porto, Porto, Portugal
| | - M Santos
- 17 i3S, Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Porto, Portugal.,18 UnIGENe, Instituto Biologia Molecular Celular, Universidade do Porto, Porto, Portugal
| | - T Pinho
- 17 i3S, Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Porto, Portugal.,18 UnIGENe, Instituto Biologia Molecular Celular, Universidade do Porto, Porto, Portugal.,19 CESPU, Instituto de Investigacão e Formação Avançada em Ciências e Tecnologias da Saúde, Rua Central de Gandra, Gandra-PRD, Portugal
| | - R Jonsson
- 20 Icelandic Health Insurance, Reykjavík, Iceland
| | - G Audolfsson
- 21 Department of Plastic Surgery, Landspitali-University Hospital, Reykjavik, Iceland
| | | | - M S Nawaz
- 1 deCODE genetics/Amgen, Reykjavik, Iceland.,22 Faculty of Medicine, University of Iceland, Reykjavik, Iceland
| | - S Olafsson
- 1 deCODE genetics/Amgen, Reykjavik, Iceland
| | | | - A Ingason
- 1 deCODE genetics/Amgen, Reykjavik, Iceland
| | | | | | - G B Walters
- 1 deCODE genetics/Amgen, Reykjavik, Iceland.,22 Faculty of Medicine, University of Iceland, Reykjavik, Iceland
| | - M Zervas
- 1 deCODE genetics/Amgen, Reykjavik, Iceland
| | - A Oddsson
- 1 deCODE genetics/Amgen, Reykjavik, Iceland
| | | | | | | | - K Stefansson
- 1 deCODE genetics/Amgen, Reykjavik, Iceland.,22 Faculty of Medicine, University of Iceland, Reykjavik, Iceland
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50
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Haddaji Mastouri M, De Coster P, Zaghabani A, Jammali F, Raouahi N, Ben Salem A, Saad A, Coucke P, H'mida Ben Brahim D. Genetic study of non-syndromic tooth agenesis through the screening of paired box 9, msh homeobox 1, axin 2, and Wnt family member 10A genes: a case-series. Eur J Oral Sci 2017; 126:24-32. [PMID: 29114927 DOI: 10.1111/eos.12391] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/03/2017] [Indexed: 02/04/2023]
Abstract
Non-syndromic tooth agenesis (NSTA) is the most common developmental anomaly in humans. Several studies have been conducted on dental agenesis and numerous genes have been identified. However, the pathogenic mechanisms responsible for NSTA are not clearly understood. We studied a group of 28 patients with sporadic NSTA and nine patients with a family history of tooth agenesis. We focused on four genes - paired box 9 (PAX9), Wnt family member 10A (WNT10A), msh homeobox 1 (MSX1), and axin 2 (AXIN2) - using direct Sanger sequencing of the exons and intron-exon boundaries. The most prevalent variants identified in PAX9 and AXIN2 genes were analyzed using the chi-square test. The sequencing results revealed a number of variants in the AXIN2 gene, including one novel missense mutation in one patient with agenesis of a single second premolar. We also identified one variant in the AXIN2 gene as being a putative risk factor for tooth agenesis. Only one missense mutation was identified in the WNT10A gene and this mutation was found in two patients. Interestingly, WNT10A is reported as the most prevalent gene mutated in the European population with NSTA.
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Affiliation(s)
- Marwa Haddaji Mastouri
- Department of Human Cytogenetics, Molecular Genetics and Reproductive Biology, Farhat Hached University Hospital, Sousse, Tunisia
| | - Peter De Coster
- Department of Restorative Dentistry, Endodontology and Oral Biology, Ghent University Hospital, Ghent University, Ghent, Belgium
| | | | - Frej Jammali
- Department of Orthodontics, Farhat Hached University Hospital, Sousse, Tunisia
| | - Nabiha Raouahi
- Department of Orthodontics, Farhat Hached University Hospital, Sousse, Tunisia
| | | | - Ali Saad
- Department of Human Cytogenetics, Molecular Genetics and Reproductive Biology, Farhat Hached University Hospital, Sousse, Tunisia
| | - Paul Coucke
- Center for Medical Genetics, Ghent University Hospital, Ghent University, Ghent, Belgium
| | - Dorra H'mida Ben Brahim
- Department of Human Cytogenetics, Molecular Genetics and Reproductive Biology, Farhat Hached University Hospital, Sousse, Tunisia
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