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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; 155:484-495.e21. [PMID: 38713117 DOI: 10.1016/j.adaj.2024.02.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [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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2
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Zhao Y, Ren J, Meng L, Hou Y, Liu C, Zhang G, Shen W. Characterization of novel MSX1 variants causally associated with non-syndromic oligodontia in Chinese families. Mol Genet Genomic Med 2024; 12:e2334. [PMID: 38069551 PMCID: PMC10767605 DOI: 10.1002/mgg3.2334] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2023] [Revised: 09/03/2023] [Accepted: 11/28/2023] [Indexed: 01/07/2024] Open
Abstract
BACKGROUND MSX1 (OMIM #142983) is crucial to normal dental development, and variants in MSX1 are associated with dental anomalies. The objective of this study was to characterize the pathogenicity of novel MSX1 variants in Chinese families with non-syndromic oligodontia (NSO). METHODS Genomic DNA was extracted from individuals representing 35 families with non-syndromic oligodontia and was analyzed by Sanger sequencing and whole-exome sequencing. Pathogenic variants were screened via analyses involving PolyPhen-2, Sorting-Intolerant from Tolerant, and MutationTaster, and conservative analysis of variants. Patterns of MSX1-related NSO were analyzed. MSX1 structural changes suggested functional consequences in vitro. RESULTS Three previously unreported MSX1 heterozygous variants were identified: one insertion variant (c.576_577insTAG; p.Gln193*) and two missense variants (c. 871T>C; p.Tyr291His and c. 644A>C; p.Gln215Pro). Immunofluorescence analysis revealed abnormal subcellular localization of the p.Gln193* MSX1 variant. In addition, we found that these MSX1 variants likely lead to the loss of second premolars. CONCLUSION Three novel MSX1 variants were identified in Chinese Han families with NSO, expanding the MSX1 variant spectrum and presenting a genetic origin for the pathogenesis detected in patients and their families.
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Affiliation(s)
- Ya Zhao
- Department of Prosthodontics, Hebei Key Laboratory of Stomatology, Hebei Clinical Research Center for Oral Diseases, School and Hospital of StomatologyHebei Medical UniversityShijiazhuangPR China
| | - Jiabao Ren
- Department of Prosthodontics, Hebei Key Laboratory of Stomatology, Hebei Clinical Research Center for Oral Diseases, School and Hospital of StomatologyHebei Medical UniversityShijiazhuangPR China
| | - Lingqiang Meng
- Department of Prosthodontics, Hebei Key Laboratory of Stomatology, Hebei Clinical Research Center for Oral Diseases, School and Hospital of StomatologyHebei Medical UniversityShijiazhuangPR China
| | - Yan Hou
- Department of Orthodontics, Hebei Key Laboratory of Stomatology, Hebei Clinical Research Center for Oral Diseases, School and Hospital of StomatologyHebei Medical UniversityShijiazhuangPR China
| | - Chunyan Liu
- Department of Orthodontics, Hebei Key Laboratory of Stomatology, Hebei Clinical Research Center for Oral Diseases, School and Hospital of StomatologyHebei Medical UniversityShijiazhuangPR China
| | - Guozhong Zhang
- College of Forensic MedicineHebei Medical UniversityShijiazhuangPR China
| | - Wenjing Shen
- Hebei Key Laboratory of Stomatology, Hebei Clinical Research Center for Oral Diseases, School and Hospital of StomatologyHebei Medical UniversityShijiazhuangPR China
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3
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Gao Y, Jiang X, Wei Z, Long H, Lai W. The EDA/EDAR/NF-κB pathway in non-syndromic tooth agenesis: A genetic perspective. Front Genet 2023; 14:1168538. [PMID: 37077539 PMCID: PMC10106650 DOI: 10.3389/fgene.2023.1168538] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Accepted: 03/23/2023] [Indexed: 04/05/2023] Open
Abstract
Non-syndromic tooth agenesis (NSTA) is one of the most common dental developmental malformations affected by genetic factors predominantly. Among all 36 candidate genes reported in NSTA individuals, EDA, EDAR, and EDARADD play essential roles in ectodermal organ development. As members of the EDA/EDAR/NF-κB signaling pathway, mutations in these genes have been implicated in the pathogenesis of NSTA, as well as hypohidrotic ectodermal dysplasia (HED), a rare genetic disorder that affects multiple ectodermal structures, including teeth. This review provides an overview of the current knowledge on the genetic basis of NSTA, with a focus on the pathogenic effects of the EDA/EDAR/NF-κB signaling pathway and the role of EDA, EDAR, and EDARADD mutations in developmental tooth defects. We also discuss the phenotypic overlap and genetic differences between NSTA and HED. Ultimately, this review highlights the importance of genetic analysis in diagnosing and managing NSTA and related ectodermal disorders, and the need for ongoing research to improve our understanding of these conditions.
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Affiliation(s)
- Yanzi Gao
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
- Department of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Xiaohui Jiang
- Human Sperm Bank, Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University), Ministry of Education, West China Second University Hospital, Sichuan University, Chengdu, China
| | - Zhi Wei
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
- Department of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Hu Long
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
- Department of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Wenli Lai
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
- Department of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
- *Correspondence: Wenli Lai,
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Chavez DE, Gronau I, Hains T, Dikow RB, Frandsen PB, Figueiró HV, Garcez FS, Tchaicka L, de Paula RC, Rodrigues FHG, Jorge RSP, Lima ES, Songsasen N, Johnson WE, Eizirik E, Koepfli KP, Wayne RK. Comparative genomics uncovers the evolutionary history, demography, and molecular adaptations of South American canids. Proc Natl Acad Sci U S A 2022; 119:e2205986119. [PMID: 35969758 PMCID: PMC9407222 DOI: 10.1073/pnas.2205986119] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Accepted: 06/28/2022] [Indexed: 11/18/2022] Open
Abstract
The remarkable radiation of South American (SA) canids produced 10 extant species distributed across diverse habitats, including disparate forms such as the short-legged, hypercarnivorous bush dog and the long-legged, largely frugivorous maned wolf. Despite considerable research spanning nearly two centuries, many aspects of their evolutionary history remain unknown. Here, we analyzed 31 whole genomes encompassing all extant SA canid species to assess phylogenetic relationships, interspecific hybridization, historical demography, current genetic diversity, and the molecular bases of adaptations in the bush dog and maned wolf. We found that SA canids originated from a single ancestor that colonized South America 3.9 to 3.5 Mya, followed by diversification east of the Andes and then a single colonization event and radiation of Lycalopex species west of the Andes. We detected extensive historical gene flow between recently diverged lineages and observed distinct patterns of genomic diversity and demographic history in SA canids, likely induced by past climatic cycles compounded by human-induced population declines. Genome-wide scans of selection showed that disparate limb proportions in the bush dog and maned wolf may derive from mutations in genes regulating chondrocyte proliferation and enlargement. Further, frugivory in the maned wolf may have been enabled by variants in genes associated with energy intake from short-chain fatty acids. In contrast, unique genetic variants detected in the bush dog may underlie interdigital webbing and dental adaptations for hypercarnivory. Our analyses shed light on the evolution of a unique carnivoran radiation and how it was shaped by South American topography and climate change.
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Affiliation(s)
- Daniel E. Chavez
- Department of Ecology and Evolutionary Biology, University of California, Los Angeles, CA 90095
- Biodesign Institute, School of Life Sciences, Arizona State University, Tempe, AZ 85287
| | - Ilan Gronau
- Efi Arazi School of Computer Science, Reichman University, Herzliya 46150, Israel
| | - Taylor Hains
- Committee on Evolutionary Biology, University of Chicago, Chicago, IL 60637
| | - Rebecca B. Dikow
- Data Science Lab, Office of the Chief Information Officer, Smithsonian Institution, Washington, DC 20560
| | - Paul B. Frandsen
- Data Science Lab, Office of the Chief Information Officer, Smithsonian Institution, Washington, DC 20560
- Department of Plant and Wildlife Sciences, Brigham Young University, Provo, UT 84602
| | - Henrique V. Figueiró
- Smithsonian’s National Zoo and Conservation Biology Institute, Center for Species Survival, Front Royal, VA 22630
- School of Health and Life Sciences, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, 90619-900, Brazil
| | - Fabrício S. Garcez
- School of Health and Life Sciences, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, 90619-900, Brazil
| | - Ligia Tchaicka
- Rede de Biodiversidade e Biotecnologia da Amazônia, Curso de Pós-Graduação em Recursos Aquáticos e Pesca, Universidade Estadual do Maranhão, São Luis, 2016-8100, Brazil
| | - Rogério C. de Paula
- Centro Nacional de Pesquisa e Conservação de Mamíferos Carnívoros, Instituto Chico Mendes de Conservação da Biodiversidade, 12952-011, Atibaia, Brazil
| | - Flávio H. G. Rodrigues
- Department of Genetics, Ecology and Evolution, Universidade Federal de Minas Gerais, Belo Horizonte, 31270-901, Brazil
| | - Rodrigo S. P. Jorge
- Centro Nacional de Avaliação da Biodiversidade e de Pesquisa e Conservação do Cerrado, Instituto Chico Mendes de Conservação da Biodiversidade, Brasilia, 70670-350, Brazil
| | - Edson S. Lima
- Private address, Nova Xavantina, MT, 78690-000, Brazil
| | - Nucharin Songsasen
- Smithsonian’s National Zoo and Conservation Biology Institute, Center for Species Survival, Front Royal, VA 22630
| | - Warren E. Johnson
- Smithsonian’s National Zoo and Conservation Biology Institute, Center for Species Survival, Front Royal, VA 22630
| | - Eduardo Eizirik
- School of Health and Life Sciences, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, 90619-900, Brazil
- Instituto Pró-Carnívoros, Atibaia, 12945-010, Brazil
- Instituto Nacional de Ciência e Tecnologia em Ecologia Evolução Conservação da Biodiverside, Universidade Federal de GoiásGoiânia, 74690-900, Brazil
| | - Klaus-Peter Koepfli
- Smithsonian’s National Zoo and Conservation Biology Institute, Center for Species Survival, Front Royal, VA 22630
- Smithsonian-Mason School of Conservation, George Mason University, Front Royal, VA 22630
| | - Robert K. Wayne
- Department of Ecology and Evolutionary Biology, University of California, Los Angeles, CA 90095
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5
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Liu H, Liu H, Su L, Zheng J, Feng H, Liu Y, Yu M, Han D. Four Novel PAX9 Variants and the PAX9-Related Non-Syndromic Tooth Agenesis Patterns. Int J Mol Sci 2022; 23:ijms23158142. [PMID: 35897718 PMCID: PMC9331840 DOI: 10.3390/ijms23158142] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Revised: 07/20/2022] [Accepted: 07/21/2022] [Indexed: 12/26/2022] Open
Abstract
The purpose of this research was to investigate and identify PAX9 gene variants in four Chinese families with non-syndromic tooth agenesis. We identified pathogenic gene variants by whole-exome sequencing (WES) and Sanger sequencing and then studied the effects of these variants on function by bioinformatics analysis and in vitro experiments. Four novel PAX9 heterozygous variants were identified: two missense variants (c.191G > T (p.G64V) and c.350T > G (p.V117G)) and two frameshift variants (c.352delC (p.S119Pfs*2) and c.648_649insC(p.Y217Lfs*100)). The bioinformatics analysis showed that these variants might be pathogenic. The tertiary structure analysis showed that these four variants could cause structural damage to PAX9 proteins. In vitro functional studies demonstrated that (1) the p.Y217Lfs*100 variant greatly affects mRNA stability, thereby affecting endogenous expression; (2) the p. S119Pfs* 2 variant impairs the subcellular localization of the nuclear expression of the wild-type PAX9 protein; and (3) the four variants (p.G64V, p.V117G, p.S119Pfs*2, and p.Y217Lfs*100) all significantly affect the downstream transcriptional activity of the BMP4 gene. In addition, we summarized and analyzed tooth missing positions caused by PAX9 variants and found that the maxillary second molar (84.11%) and mandibular second molar (84.11%) were the most affected tooth positions by summarizing and analyzing the PAX9-related non-syndromic tooth agenesis positions. Our results broaden the variant spectrum of the PAX9 gene related to non-syndromic tooth agenesis and provide useful information for future genetic counseling.
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Affiliation(s)
| | | | | | | | | | | | - Miao Yu
- Correspondence: (M.Y.); (D.H.); Fax: +86-10-8210-5259 (M.Y.); +86-10-6217-3402 (D.H.)
| | - Dong Han
- Correspondence: (M.Y.); (D.H.); Fax: +86-10-8210-5259 (M.Y.); +86-10-6217-3402 (D.H.)
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6
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Novel MSX1 variants identified in families with nonsyndromic oligodontia. Int J Oral Sci 2021; 13:2. [PMID: 33419968 PMCID: PMC7794556 DOI: 10.1038/s41368-020-00106-0] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Revised: 11/24/2020] [Accepted: 11/26/2020] [Indexed: 11/08/2022] Open
Abstract
The goal of this study was to identify MSX1 gene variants in multiple Chinese families with nonsyndromic oligodontia and analyse the functional influence of these variants. Whole-exome sequencing (WES) and Sanger sequencing were performed to identify the causal gene variants in five families with nonsyndromic oligodontia, and a series of bioinformatics databases were used for variant confirmation and functional prediction. Phenotypic characterization of the members of these families was described, and an in vitro analysis was performed for functional evaluation. Five novel MSX1 heterozygous variants were identified: three missense variants [c.662A>C (p.Q221P), c.670C>T (p.R224C), and c.809C>T (p.S270L)], one nonsense variant [c.364G>T (p.G122*)], and one frameshift variant [c.277delG (p.A93Rfs*67)]. Preliminary in vitro studies demonstrated that the subcellular localization of MSX1 was abnormal with the p.Q221P, p.R224C, p.G122*, and p.A93Rfs*67 variants compared to the wild type. Three variants (p.Q221P, p.G122*, and p.A93Rfs*67) were classified as pathogenic or likely pathogenic, while p.S270L and p.R224C were of uncertain significance in the current data. Moreover, we summarized and analysed the MSX1-related tooth agenesis positions and found that the type and variant locus were not related to the severity of tooth loss. Our results expand the variant spectrum of nonsyndromic oligodontia and provide valuable information for genetic counselling.
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7
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Marzouk T, Alves IL, Wong CL, DeLucia L, McKinney CM, Pendleton C, Howe BJ, Marazita ML, Peter TK, Kopycka-Kedzierawski DT, Morrison CS, Malmstrom H, Wang H, Shope ET. Association between Dental Anomalies and Orofacial Clefts: A Meta-analysis. JDR Clin Trans Res 2020; 6:368-381. [PMID: 33030085 DOI: 10.1177/2380084420964795] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
OBJECTIVES To conduct a systematic review and meta-analysis to assess whether individuals with nonsyndromic orofacial clefts (OCs) display a higher frequency of dental anomalies (DAs) when compared with individuals without OCs. METHODS A literature search of indexed databases (PubMed, Cochrane, Web of Science, Embase, Scopus, and LILACS) was conducted without language restriction up to and including February 1, 2020. Cross-referencing was used to further identify articles. Several cleft teams across the United States and Europe were contacted to obtain unpublished data. The eligibility criteria were observational studies with original data that statistically compared individuals with OC without syndromes and those without OC on any type of DA in primary and/or permanent dentition. Random effects meta-analysis through the Mantel-Haenszel estimator was used to evaluate the association between OC and DA based on odds ratios (ORs) with 95% confidence intervals (CIs). RESULTS The literature search generated 933 records, and 75 full-text articles were reviewed. Twenty-six studies encompassing 15,213 individuals met the inclusion criteria. The meta-analysis revealed statistically significant associations between OC and agenesis (OR, 14.2; 95% CI, 9.4 to 21.3), supernumerary teeth (OR, 5.7; 95% CI, 3.3 to 9.7), developmental enamel defects (OR, 5.6; 95% CI, 3.5 to 9.0), microdontia (OR, 14.8; 95% CI, 4.0 to 54.6), peg-shaped anterior teeth (OR, 12.2; 95% CI, 3.6 to 41.2), taurodontism (OR, 1.7; 95% CI, 1.0 to 2.7), tooth malposition and/or transposition (OR, 5.6; 95% CI, 2.8 to 11.5), tooth rotation (OR, 3.2; 95% CI, 1.3 to 8.2), and tooth impaction (OR, 3.6; 95% CI, 1.1 to 12.2). The OR estimates of the reviewed studies exhibited significant heterogeneity (P < 0.0001). No association was observed between OC and fusion and/or gemination. CONCLUSION Within the limitations of this study, the available evidence suggests that individuals with OCs are more likely to present with a range of DAs than their unaffected peers. KNOWLEDGE TRANSFER STATEMENT The findings of the current review suggest that individuals with orofacial clefts (OCs) are more likely to present with a range of dental anomalies than their unaffected peers. Understanding the association between OCs and dental anomalies is essential in guiding clinicians during treatment-planning procedures and is important in raising our awareness of the possible need for future dental treatment for patients with OCs.
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Affiliation(s)
- T Marzouk
- Department of Dentistry, Eastman Institute for Oral Health, University of Rochester, Rochester, NY, USA.,Division of Pediatric Dentistry, Eastman Institute for Oral Health, University of Rochester, Rochester, NY, USA
| | - I L Alves
- Dentistry Faculty, Federal University of Bahia, Salvador, BA, Brazil
| | - C L Wong
- Division of Pediatric Dentistry, Eastman Institute for Oral Health, University of Rochester, Rochester, NY, USA
| | - L DeLucia
- Division of Pediatric Dentistry, Eastman Institute for Oral Health, University of Rochester, Rochester, NY, USA
| | - C M McKinney
- Division of Craniofacial Medicine and Seattle Children's Research Institute, Department of Pediatrics, University of Washington, Seattle, WA, USA
| | - C Pendleton
- Department of Biostatistics, College of Public Health, University of Iowa, Iowa City, IA, USA.,Iowa Institute for Oral Health Research, College of Dentistry and Dental Clinics, University of Iowa, Iowa City, IA, USA
| | - B J Howe
- Iowa Institute for Oral Health Research, College of Dentistry and Dental Clinics, University of Iowa, Iowa City, IA, USA.,Department of Family Dentistry, College of Dentistry and Dental Clinics, University of Iowa, Iowa City, IA, USA
| | - M L Marazita
- Center for Craniofacial and Dental Genetics, School of Dental Medicine, University of Pittsburgh, Pittsburgh, PA, USA
| | - T K Peter
- Department of Biostatistics, College of Public Health, University of Iowa, Iowa City, IA, USA.,Iowa Institute for Oral Health Research, College of Dentistry and Dental Clinics, University of Iowa, Iowa City, IA, USA
| | - D T Kopycka-Kedzierawski
- Department of Dentistry, Eastman Institute for Oral Health, University of Rochester, Rochester, NY, USA
| | - C S Morrison
- Golisano Cleft and Craniofacial Center, University of Rochester, Rochester, NY, USA.,Department of Surgery, Division of Plastic Surgery, University of Rochester Medical Center, Rochester, NY, USA
| | - H Malmstrom
- Department of Dentistry, Eastman Institute for Oral Health, University of Rochester, Rochester, NY, USA
| | - H Wang
- Department of Biostatistics and Computational Biology, University of Rochester, Rochester, NY, USA
| | - E T Shope
- Division of Pediatric Dentistry, Eastman Institute for Oral Health, University of Rochester, Rochester, NY, USA.,Golisano Cleft and Craniofacial Center, University of Rochester, Rochester, NY, USA
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8
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Yu M, Wang H, Fan Z, Xie C, Liu H, Liu Y, Han D, Wong SW, Feng H. BMP4 mutations in tooth agenesis and low bone mass. Arch Oral Biol 2019; 103:40-46. [PMID: 31128441 DOI: 10.1016/j.archoralbio.2019.05.012] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Revised: 05/06/2019] [Accepted: 05/13/2019] [Indexed: 01/07/2023]
Abstract
OBJECTIVE To identify an uncommon genetic cause of tooth agenesis (TA) by utilizing whole exome sequencing (WES) and targeted Sanger sequencing in a cohort of 120 patients with isolated TA. DESIGN One deleterious mutation in the gene encoding bone morphogenetic protein 4 (BMP4) was identified in 6 unrelated patients with TA by WES. After that, the coding exons of BMP4 were examined in 114 TA patients using Sanger sequencing. Dual-energy X-ray absorptiometry (DEXA) was used to measure the bone mineral density of patients who carried a BMP4 mutation. Finally, preliminary functional studies of two BMP4 mutants were performed. RESULTS We detected 3 novel missense mutations (c.58 G > A: p.Gly20Ser, c.326 G > T: p.Arg109Leu and c.614 T > C: p.Val205Ala) and 1 reported mutation in the BMP4 gene among 120 TA probands. The previously reported BMP4 mutation (c.751C > T: p.His251Tyr) was associated with urethra and eye anomalies. By extending the pedigrees, we determined that the tooth phenotypes had an autosomal dominant inheritance pattern, as individuals carrying a BMP4 mutation exhibit different types of dental anomalies. Interestingly, we observed that patients harboring a BMP4 mutation manifested early onset osteopenia or osteoporosis. Further in vitro functional assays demonstrated that two BMP4 mutants resulted in a decreased activation of Smad signaling. Therefore, a loss-of-function in BMP4 may contribute to the clinical phenotypes seen in this study. CONCLUSIONS We identified 4 mutations in the BMP4 gene in 120 TA patients. To our knowledge, this is the first study to describe human skeletal diseases associated with BMP4 mutations.
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Affiliation(s)
- Miao Yu
- Department of Prosthodontics, Peking University School and Hospital of Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, China
| | - Hao Wang
- Department of Prosthodontics, Peking University School and Hospital of Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, China
| | - Zhuangzhuang Fan
- Department of Prosthodontics, Peking University School and Hospital of Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, China
| | - Chencheng Xie
- Department of Internal Medicine, Sanford Medical School, University of South Dakota, Sioux Falls, SD, 57105, USA
| | - Haochen Liu
- Department of Prosthodontics, Peking University School and Hospital of Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, China
| | - Yang Liu
- Department of Prosthodontics, Peking University School and Hospital of Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, China.
| | - Dong Han
- Department of Prosthodontics, Peking University School and Hospital of Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, China.
| | - Sing-Wai Wong
- Department of Periodontology, Adams School of Dentistry, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA.
| | - Hailan Feng
- Department of Prosthodontics, Peking University School and Hospital of Stomatology, National Clinical Research Center for Oral Diseases, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, China
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9
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Wang H, Liu Y, Liu HC, Han D, Feng HL. [Detection and functional analysis of BMP2 gene mutation in patients with tooth agenesis]. JOURNAL OF PEKING UNIVERSITY. HEALTH SCIENCES 2019; 51:9-15. [PMID: 30773537 DOI: 10.19723/j.issn.1671-167x.2019.01.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To screen for BMP2 mutation with functional impact in patients with congenital tooth agenesis and to make oral and skeletal phenotype record and functional analysis with in vitro experiments. METHODS We enrolled eighteen patients with congenital tooth agenesis. The medical and dental history was collected,and clinical and dental examinations including the X-ray examination of oral-facial and skeletal bone were performed for the phenotypic analysis. Blood samples were collected to extract DNA and whole exome sequencing was conducted. The genes involved in oral-facial development and congenital skeletal diseases were investigated for mutation screening. The mutations with functional impact were then investigated. In one patient, the BMP2 mutation with putative functional impact was selected for functional analysis. Wild type and mutant BMP2 plasmids with green fluorescent protein (GFP) tag were constructed and transfected into HEK293T cells. Subcellular protein distribution was observed under laser scanning confocal microscope. The activation of downstream SMAD1/5/9 phosphorylation by BMP2 was detected by Western blotting to investigate the functional impact and genetic pathogenicity. RESULTS BMP2 mutation NM_001200.3:c.393A>T (p.Arg131Ser), rs140417301 was detected in one patient with congenital tooth agenesis, while for other genes involved in oral-facial development and congenital skeletal diseases, no functionally significant mutation was found. The proband's parents didn't carry this mutation. The father had normal dentition, while the mother lacked one premolar, and both the parents showed normal palate and maxilla. The patient also had maxillary hypoplasia in both sagittal and coronal planes, palatal dysmorphology, and malocclusion, and was diagonsed with osteopenia after the X-ray examnination of his skeletal bone. Functional analysis showed this mutation had normal subcelluar localization but reduced phosphorylation of SMAD1/5/9 (reduction by 32%, 22%, and 27% in three independent replicates). Taken together with family co-segregation, this mutaion was considered as "likely pathogenic". CONCLUSION BMP2 mutation c.393A>T (p. Arg131Ser) affects bone morphogenetic protein signaling activity, and may affect the number of teeth, growth of maxilla and palate, and bone mineral density.
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Affiliation(s)
- H Wang
- Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
| | - Y Liu
- Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
| | - H C Liu
- Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
| | - D Han
- Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
| | - H L Feng
- Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
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10
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The role of external aetiological factors in dental anomalies in non-syndromic cleft lip and palate patients. Eur Arch Paediatr Dent 2018; 20:105-111. [DOI: 10.1007/s40368-018-0397-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Accepted: 11/29/2018] [Indexed: 12/17/2022]
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11
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Zhang T, Zhao X, Hou F, Sun Y, Wu J, Ma T, Zhang X. A novel
PAX9
mutation found in a Chinese patient with hypodontia via whole exome sequencing. Oral Dis 2018; 25:234-241. [DOI: 10.1111/odi.12982] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Revised: 08/31/2018] [Accepted: 09/20/2018] [Indexed: 01/22/2023]
Affiliation(s)
- Tingting Zhang
- Department of Oral and Maxillofacial Surgery, School of Stomatology Tianjin Medical University Tianjin China
| | - Xiaoxue Zhao
- Department of Pediatric Dentistry, School of Stomatology Tianjin Medical University Tianjin China
| | - Feifei Hou
- Department of Pediatric Dentistry, School of Stomatology Tianjin Medical University Tianjin China
| | - Yanwei Sun
- Department of Pediatric Dentistry, School of Stomatology Tianjin Medical University Tianjin China
| | - Jing Wu
- Department of Pediatric Dentistry, School of Stomatology Tianjin Medical University Tianjin China
| | - Tengfei Ma
- Department of Pediatric Dentistry, School of Stomatology Tianjin Medical University Tianjin China
| | - Xiangyu Zhang
- Department of Pediatric Dentistry, School of Stomatology Tianjin Medical University Tianjin China
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12
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Next generation sequencing reveals a novel nonsense mutation in MSX1 gene related to oligodontia. PLoS One 2018; 13:e0202989. [PMID: 30192788 PMCID: PMC6128526 DOI: 10.1371/journal.pone.0202989] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2018] [Accepted: 08/12/2018] [Indexed: 12/11/2022] Open
Abstract
Tooth agenesis is one of the most common craniofacial disorders in humans. More than 350 genes have been associated with teeth development. In this study, we enrolled 60 child patients (age 13 to 17) with various types of tooth agenesis. Whole gene sequences of PAX9, MSX1, AXIN2, EDA, EDAR and WNT10a genes were sequenced by next generation sequencing on the Illumina MiSeq platform. We found previously undescribed heterozygous nonsense mutation g.8177G>T (c.610G>T) in MSX1 gene in one child. Mutation was verified by Sanger sequencing. Sequencing analysis was performed in other family members of the affected child. All family members carrying g.8177G>T mutation suffered from oligodontia (missing more than 6 teeth excluding third molars). Mutation g.8177G>T leads to a stop codon (p.E204X) and premature termination of Msx1 protein translation. Based on previous in vitro experiments on mutation disrupting function of Msx1 homeodomain, we assume that the heterozygous g.8177G>T nonsense mutation affects the amount and function of Msx1 protein and leads to tooth agenesis.
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13
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Xin T, Zhang T, Li Q, Yu T, Zhu Y, Yang R, Zhou Y. A novel mutation of MSX1 in oligodontia inhibits odontogenesis of dental pulp stem cells via the ERK pathway. Stem Cell Res Ther 2018; 9:221. [PMID: 30134957 PMCID: PMC6106924 DOI: 10.1186/s13287-018-0965-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Revised: 07/17/2018] [Accepted: 07/31/2018] [Indexed: 01/09/2023] Open
Abstract
Background Tooth agenesis, one of the most common developmental anomalies, can affect the function and esthetics of patients. The aim of the present study was to identify genetic clues for familial tooth agenesis and explore the underlying mechanisms, focusing on the role of human dental pulp stem cells (hDPSCs). Methods We applied Sanger sequencing to identify the cause of oligodontia in a Chinese family. DNA transfection and functional analysis in DPSCs was also performed to explore the impact of the identified mutation on this phenotype. Results In this study, a novel frameshift mutation, the twenty-nucleotide deletion (c.128_147del20, p.Met43Serfsx125), in exon1 of MSX1 was detected in a Chinese family causing autosomal dominant nonsyndromic oligodontia. The mutation cosegregated with the tooth agenesis phenotype in this family. DPSCs transfected with mutant MSX1 plasmid showed decreased capacity of osteo/odontogenic differentiation with a lower expression level of dentin sialophosphoprotein (DSPP) and bone sialoprotein (BSP) compared with those transfected with control MSX1 plasmid. Mechanically, control MSX1 showed nuclear localization while the mutant MSX1 inhibited its nuclear translocation and localized on the cytoplasm to inhibit ERK phosphorylation. Furthermore, we inhibited the ERK pathway using ERK inhibitor (U0126) treatment in control MSX1-transfected DPSCs which could downregulate mineralized nodule formation and the expression of odontogenic genes. Conclusion We demonstrated a novel MSX1 mutation causing familial nonsyndromic oligodontia and mechanically MSX1 regulates odontogenesis through the ERK signaling pathway in human dental pulp stem cells. Electronic supplementary material The online version of this article (10.1186/s13287-018-0965-3) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Tianyi Xin
- Department of Orthodontics, Peking University School and Hospital of Stomatology, Beijing, 100081, China.,National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Beijing, 100081, China
| | - Ting Zhang
- Department of Orthodontics, Peking University School and Hospital of Stomatology, Beijing, 100081, China.,National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Beijing, 100081, China
| | - Qian Li
- Department of Orthodontics, Peking University School and Hospital of Stomatology, Beijing, 100081, China.,National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Beijing, 100081, China
| | - Tingting Yu
- Department of Orthodontics, Peking University School and Hospital of Stomatology, Beijing, 100081, China.,National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Beijing, 100081, China
| | - Yunyan Zhu
- Department of Orthodontics, Peking University School and Hospital of Stomatology, Beijing, 100081, China.,National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Beijing, 100081, China
| | - Ruili Yang
- Department of Orthodontics, Peking University School and Hospital of Stomatology, Beijing, 100081, China. .,National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Beijing, 100081, China.
| | - Yanheng Zhou
- Department of Orthodontics, Peking University School and Hospital of Stomatology, Beijing, 100081, China. .,National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Beijing, 100081, China.
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14
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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: 86] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [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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15
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Zeng L, Wei J, Han D, Liu H, Liu Y, Zhao N, Sun S, Wang Y, Feng H. Functional analysis of novel RUNX2 mutations in cleidocranial dysplasia. Mutagenesis 2018; 32:437-443. [PMID: 28505335 DOI: 10.1093/mutage/gex012] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Cleidocranial dysplasia (CCD) is a rare autosomal dominant skeletal disorder caused by mutation of runt-related transcription factor 2 (RUNX2) gene. The purpose of this study was to explore novel RUNX2 mutations in seven individuals with CCD and investigate the function of the mutant RUNX2 proteins. DNA samples were prepared from the peripheral blood of the CCD individuals, and then subjected to DNA sequencing. Conservation and secondary structure analysis were performed based on RUNX2 sequencing results. pEGFP-C1 plasmids containing GFP-tagged wild-type RUNX2 and three novel RUNX2 mutations expression cassettes were constructed, and then transfected into HEK293T cells. Cell fluorescence, luciferase assay and western blotting were used to analyse the subcellular distribution and function of the mutant RUNX2 proteins. Three novel mutations (R193G, 258fs, Y400X) were found in the seven CCD patients. Conservation and structure analysis show one novel mutation (R193G) in Runt domain and two novel mutations (258fs and Y400X) in PST domain of RUNX2. Western blotting confirmed that the 258fs and Y400X mutations produced truncated proteins. Fluorescence detection showed that the three novel mutants localised exclusively in the nucleus. However, luciferase assay indicated all mutants severely impaired the transactivation activities of RUNX2 on osteocalcin promoter. Our results broaden the spectrum of RUNX2 mutations in CCD individuals and demonstrated that loss of function in RUNX2 is responsible for CCD.
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Affiliation(s)
- Li Zeng
- Department of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing, PR China
| | - Jiahui Wei
- Department of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing, PR China
| | - Dong Han
- Department of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing, PR China
| | - Haochen Liu
- Department of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing, PR China
| | - Yang Liu
- Department of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing, PR China
| | - Na Zhao
- Department of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing, PR China
| | - Shichen Sun
- Department of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing, PR China
| | - Yixiang Wang
- Central Laboratory, Peking University School and Hospital of Stomatology, Beijing, PR China
| | - Hailan Feng
- Department of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing, PR China
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16
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Shibata A, Machida J, Yamaguchi S, Kimura M, Tatematsu T, Miyachi H, Nakayama A, Shimozato K, Tokita Y. Identification of nuclear localization signals in the human homeoprotein MSX1. Biochem Cell Biol 2017; 96:483-489. [PMID: 29156143 DOI: 10.1139/bcb-2017-0263] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
MSX1 is one of the homeoproteins with the homeodomain (HD) sequence, which regulates proliferation and differentiation of mesenchymal cells. In this study, we investigated the nuclear localization signal (NLS) in the MSX1 HD by deletion and amino acid substitution analyses. The web-based tool NLStradamus predicted 2 putative basic motifs in the N- and C-termini of the MSX1 HD. Green fluorescent protein (GFP) chimera studies revealed that NLS1 (161RKHKTNRKPR170) and NLS2 (216NRRAKAKR223) were independently insufficient for robust nuclear localization. However, they can work cooperatively to promote nuclear localization of MSX1, as was shown by the 2 tandem NLS motifs partially restoring functional NLS, leading to a significant nuclear accumulation of the GFP chimera. These results demonstrate a unique NLS motif in MSX1, which consists of an essential single core motif in helix-I, with weak potency, and an auxiliary subdomain in helix-III, which alone does not have nuclear localization potency. Additionally, other peptide sequences, other than predicted 2 motifs in the spacer, may be necessary for complete nuclear localization in MSX1 HD.
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Affiliation(s)
- Akio Shibata
- a Department of Maxillofacial Surgery, Aichi-Gakuin University School of Dentistry, Nagoya, Japan.,b Department of Perinatology, Institute for Developmental Research, Aichi Human Service Center, Kasugai, Japan
| | - Junichiro Machida
- a Department of Maxillofacial Surgery, Aichi-Gakuin University School of Dentistry, Nagoya, Japan.,c Department of Oral and Maxillofacial Surgery, Toyota Memorial Hospital, Toyota, Japan
| | - Seishi Yamaguchi
- a Department of Maxillofacial Surgery, Aichi-Gakuin University School of Dentistry, Nagoya, Japan.,d Department of Dentistry and Oral Surgery, Aichi Children's Health and Medical Center, Obu, Japan
| | - Masashi Kimura
- a Department of Maxillofacial Surgery, Aichi-Gakuin University School of Dentistry, Nagoya, Japan.,e Department of Oral and Maxillofacial Surgery, Ogaki Municipal Hospital, Ogaki, Japan
| | - Tadashi Tatematsu
- a Department of Maxillofacial Surgery, Aichi-Gakuin University School of Dentistry, Nagoya, Japan.,b Department of Perinatology, Institute for Developmental Research, Aichi Human Service Center, Kasugai, Japan
| | - Hitoshi Miyachi
- a Department of Maxillofacial Surgery, Aichi-Gakuin University School of Dentistry, Nagoya, Japan
| | - Atsuo Nakayama
- f Department of Embryology, Institute for Developmental Research, Aichi Human Service Center, Kasugai, Japan
| | - Kazuo Shimozato
- a Department of Maxillofacial Surgery, Aichi-Gakuin University School of Dentistry, Nagoya, Japan
| | - Yoshihito Tokita
- b Department of Perinatology, Institute for Developmental Research, Aichi Human Service Center, Kasugai, Japan
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17
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Wong SW, Han D, Zhang H, Liu Y, Zhang X, Miao MZ, Wang Y, Zhao N, Zeng L, Bai B, Wang YX, Liu H, Frazier-Bowers SA, Feng H. Nine Novel PAX9 Mutations and a Distinct Tooth Agenesis Genotype-Phenotype. J Dent Res 2017; 97:155-162. [PMID: 28910570 DOI: 10.1177/0022034517729322] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Tooth agenesis is one of the most common developmental anomalies affecting function and esthetics. The paired-domain transcription factor, Pax9, is critical for patterning and morphogenesis of tooth and taste buds. Mutations of PAX9 have been identified in patients with tooth agenesis. Despite significant progress in the genetics of tooth agenesis, many gaps in knowledge exist in refining the genotype-phenotype correlation between PAX9 and tooth agenesis. In the present study, we complete genetic and phenotypic characterization of multiplex Chinese families with nonsyndromic (NS) tooth agenesis. Direct sequencing of polymerase chain reaction products revealed 9 novel (c.140G>C, c.167T>A, c.332G>C, c.194C>A, c.271A>T, c.146delC, c.185_189dup, c.256_262dup, and c.592delG) and 2 known heterozygous mutations in the PAX9 gene among 120 probands. Subsequently, pedigrees were extended, and we confirmed that the mutations co-segregated with the tooth agenesis phenotype (with exception of families in which DNA analysis was not available). In 1 family ( n = 6), 2 individuals harbored both the PAX9 c.592delG mutation and a heterozygous missense mutation (c.739C>T) in the MSX1 gene. Clinical characterization of families segregating a PAX9 mutation reveal that all affected individuals were missing the mandibular second molar and their maxillary central incisors are most susceptible to microdontia. A significant reduction of bitter taste perception was documented in individuals harboring PAX9 mutations ( n = 3). Functional studies revealed that PAX9 haploinsufficiency or a loss of function of the PAX9 protein underlies tooth agenesis.
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Affiliation(s)
- S-W Wong
- 1 Department of Prosthodontics, School and Hospital of Stomatology, Peking University, Beijing, China.,2 Oral and Craniofacial Biomedicine Curriculum, School of Dentistry, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.,3 Immunity, Inflammation, and Disease Laboratory, National Institute of Environmental Health Sciences, Research Triangle Park, NC, USA
| | - D Han
- 1 Department of Prosthodontics, School and Hospital of Stomatology, Peking University, Beijing, China
| | - H Zhang
- 4 Central Laboratory, School and Hospital of Stomatology, Peking University, Beijing, China
| | - Y Liu
- 1 Department of Prosthodontics, School and Hospital of Stomatology, Peking University, Beijing, China
| | - X Zhang
- 1 Department of Prosthodontics, School and Hospital of Stomatology, Peking University, Beijing, China
| | - M Z Miao
- 2 Oral and Craniofacial Biomedicine Curriculum, School of Dentistry, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Y Wang
- 1 Department of Prosthodontics, School and Hospital of Stomatology, Peking University, Beijing, China
| | - N Zhao
- 1 Department of Prosthodontics, School and Hospital of Stomatology, Peking University, Beijing, China
| | - L Zeng
- 1 Department of Prosthodontics, School and Hospital of Stomatology, Peking University, Beijing, China
| | - B Bai
- 5 Department of Prosthodontics, Beijing Stomatological Hospital and School of Stomatology, Capital Medical University, Beijing, China
| | - Y-X Wang
- 4 Central Laboratory, School and Hospital of Stomatology, Peking University, Beijing, China
| | - H Liu
- 1 Department of Prosthodontics, School and Hospital of Stomatology, Peking University, Beijing, China.,6 National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Beijing, China
| | - S A Frazier-Bowers
- 7 Department of Orthodontics, School of Dentistry, University of North Carolina, Chapel Hill, NC, USA
| | - H Feng
- 1 Department of Prosthodontics, School and Hospital of Stomatology, Peking University, Beijing, China.,6 National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Beijing, China
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18
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Okutman O, Muller J, Skory V, Garnier JM, Gaucherot A, Baert Y, Lamour V, Serdarogullari M, Gultomruk M, Röpke A, Kliesch S, Herbepin V, Aknin I, Benkhalifa M, Teletin M, Bakircioglu E, Goossens E, Charlet-Berguerand N, Bahceci M, Tüttelmann F, Viville ST. A no-stop mutation in MAGEB4 is a possible cause of rare X-linked azoospermia and oligozoospermia in a consanguineous Turkish family. J Assist Reprod Genet 2017; 34:683-694. [PMID: 28401488 DOI: 10.1007/s10815-017-0900-z] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2016] [Accepted: 03/01/2017] [Indexed: 11/25/2022] Open
Abstract
PURPOSE The purpose of this study was to identify mutations that cause non-syndromic male infertility using whole exome sequencing of family cases. METHODS We recruited a consanguineous Turkish family comprising nine siblings with male triplets; two of the triplets were infertile as well as one younger infertile brother. Whole exome sequencing (WES) performed on two azoospermic brothers identified a mutation in the melanoma antigen family B4 (MAGEB4) gene which was confirmed via Sanger sequencing and then screened for on control groups and unrelated infertile subjects. The effect of the mutation on messenger RNA (mRNA) and protein levels was tested after in vitro cell transfection. Structural features of MAGEB4 were predicted throughout the conserved MAGE domain. RESULTS The novel single-base substitution (c.1041A>T) in the X-linked MAGEB4 gene was identified as a no-stop mutation. The mutation is predicted to add 24 amino acids to the C-terminus of MAGEB4. Our functional studies were unable to detect any effect either on mRNA stability, intracellular localization of the protein, or the ability to homodimerize/heterodimerize with other MAGE proteins. We thus hypothesize that these additional amino acids may affect the proper protein interactions with MAGEB4 partners. CONCLUSION The whole exome analysis of a consanguineous Turkish family revealed MAGEB4 as a possible new X-linked cause of inherited male infertility. This study provides the first clue to the physiological function of a MAGE protein.
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Affiliation(s)
- Ozlem Okutman
- Département Génomique Fonctionnelle et Cancer, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), Institut National de Santé et de Recherche Médicale (INSERM) U964/Centre National de Recherche Scientifique (CNRS) UMR 7104, Université de Strasbourg, 67404, Illkirch, France
- Institut de Parasitologie et Pathologie Tropicale, EA 7292, Fédération de Médecine Translationelle, Université de Strasbourg, 3 rue Koeberlé, 67000, Strasbourg, France
- Laboratoire de Diagnostic Génétique, UF3472-génétique de l'infertilité, Hôpitaux Universitaires de Strasbourg, 67000, Strasbourg, France
| | - Jean Muller
- Laboratoire de Diagnostic Génétique, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
- Laboratoire de Génétique Médicale, INSERM U1112, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Université de Strasbourg, Strasbourg, France
| | - Valerie Skory
- Département Génomique Fonctionnelle et Cancer, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), Institut National de Santé et de Recherche Médicale (INSERM) U964/Centre National de Recherche Scientifique (CNRS) UMR 7104, Université de Strasbourg, 67404, Illkirch, France
| | - Jean Marie Garnier
- Biologie du développement et cellules souches, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), Institut National de Santé et de Recherche Médicale (INSERM) U964/Centre National de Recherche Scientifique (CNRS) UMR 7104, Université de Strasbourg, 67404, Illkirch, France
| | - Angeline Gaucherot
- Médecine translationnelle et neurogénétique, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), Institut National de Santé et de Recherche Médicale (INSERM) U964/Centre National de Recherche Scientifique (CNRS) UMR 7104, Université de Strasbourg, 67404, Illkirch, France
| | - Yoni Baert
- Biology of the Testis, Research Laboratory for Reproduction, Genetics and Regenerative Medicine, Vrije Universiteit Brussel (VUB), Laarbeeklaan 103, 1090, Brussels, Belgium
| | - Valérie Lamour
- Département Biologie structurale intégrative, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), Institut National de Santé et de Recherche Médicale (INSERM) U964/Centre National de Recherche Scientifique (CNRS) UMR 7104, Université de Strasbourg, 67404, Illkirch, France
| | | | | | - Albrecht Röpke
- Institute of Human Genetics, University of Münster, Münster, Germany
| | - Sabine Kliesch
- Centre of Reproductive Medicine and Andrology, University of Münster, Münster, Germany
| | | | - Isabelle Aknin
- Reproductive Biology Unit, CHU-Hôpital Nord, Saint-Etienne, France
| | - Moncef Benkhalifa
- Médecine de la Reproduction et Cytogénétique Médicale CHU et Faculté de Médecine, Université de Picardie Jules Verne, 80000, Amiens, France
| | - Marius Teletin
- Département Génomique Fonctionnelle et Cancer, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), Institut National de Santé et de Recherche Médicale (INSERM) U964/Centre National de Recherche Scientifique (CNRS) UMR 7104, Université de Strasbourg, 67404, Illkirch, France
| | | | - Ellen Goossens
- Biology of the Testis, Research Laboratory for Reproduction, Genetics and Regenerative Medicine, Vrije Universiteit Brussel (VUB), Laarbeeklaan 103, 1090, Brussels, Belgium
| | - Nicolas Charlet-Berguerand
- Médecine translationnelle et neurogénétique, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), Institut National de Santé et de Recherche Médicale (INSERM) U964/Centre National de Recherche Scientifique (CNRS) UMR 7104, Université de Strasbourg, 67404, Illkirch, France
| | | | - Frank Tüttelmann
- Institute of Human Genetics, University of Münster, Münster, Germany
| | - STéphane Viville
- Département Génomique Fonctionnelle et Cancer, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), Institut National de Santé et de Recherche Médicale (INSERM) U964/Centre National de Recherche Scientifique (CNRS) UMR 7104, Université de Strasbourg, 67404, Illkirch, France.
- Institut de Parasitologie et Pathologie Tropicale, EA 7292, Fédération de Médecine Translationelle, Université de Strasbourg, 3 rue Koeberlé, 67000, Strasbourg, France.
- Laboratoire de Diagnostic Génétique, UF3472-génétique de l'infertilité, Hôpitaux Universitaires de Strasbourg, 67000, Strasbourg, France.
- Laboratoire de diagnostic génétique, UF3472-génétique de l'infertilité, Nouvel Hôpital Civil, Hôpitaux Universitaires de Strasbourg, 1 place de l'Hôpital, 67091, Strasbourg cedex, France.
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Abid MF, Simpson M, Petridis C, Cobourne M, Sharpe P. Non-syndromic severe hypodontia caused by a novel frameshift insertion mutation in the homeobox of the MSX1 gene. Arch Oral Biol 2017; 75:8-13. [DOI: 10.1016/j.archoralbio.2016.11.018] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2016] [Revised: 11/07/2016] [Accepted: 11/29/2016] [Indexed: 12/17/2022]
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Abstract
PURPOSE OF REVIEW The ebb and flow of genetic influence relative to the understanding of craniofacial and dental disorders has evolved into a tacit acceptance of the current genetic paradigm. This review explores the science behind craniofacial and dental disorders through the lens of recent past and current findings and using tooth agenesis as a model of advances in craniofacial genetics. RECENT FINDINGS Contemporary studies of craniofacial biology takes advantage of the technological resources stemming from the genomic and post-genomic eras. Emerging data highlights the role of key genes and the epigenetic landscape controlling these genes, in causing dentofacial abnormalities. We also report here a novel Glu78FS MSX1 mutation in one family segregating an autosomal dominant form of severe tooth agenesis as an illustration of an evolving theme, i.e., different mutations in the same gene can result in a spectrum of dentofacial phenotypic severity. The future of clinical therapeutics will benefit from advances in genetics and molecular biology that refine the genotype-phenotype correlation. Indeed, the past century suggests a continued convergence of genetic science in the practice of clinical dentistry.
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Affiliation(s)
- Sylvia A Frazier-Bowers
- Department of Orthodontics, School of Dentistry, University of North Carolina at Chapel Hill, CB #7450, Chapel Hill, NC, 27599-7450, USA.
| | - Siddharth R Vora
- Department of Oral Health Sciences, Faculty of Dentistry, University of British Columbia, JBM-184 - 2199 Wesbrook Mall, Vancouver, BC, V6T 1Z3, Canada
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21
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Mitsui SN, Yasue A, Masuda K, Naruto T, Minegishi Y, Oyadomari S, Noji S, Imoto I, Tanaka E. Novel human mutation and CRISPR/Cas genome-edited mice reveal the importance of C-terminal domain of MSX1 in tooth and palate development. Sci Rep 2016; 6:38398. [PMID: 27917906 PMCID: PMC5137164 DOI: 10.1038/srep38398] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2016] [Accepted: 11/08/2016] [Indexed: 01/08/2023] Open
Abstract
Several mutations, located mainly in the MSX1 homeodomain, have been identified in non-syndromic tooth agenesis predominantly affecting premolars and third molars. We identified a novel frameshift mutation of the highly conserved C-terminal domain of MSX1, known as Msx homology domain 6 (MH6), in a Japanese family with non-syndromic tooth agenesis. To investigate the importance of MH6 in tooth development, Msx1 was targeted in mice with CRISPR/Cas system. Although heterozygous MH6 disruption did not alter craniofacial development, homozygous mice exhibited agenesis of lower incisors with or without cleft palate at E16.5. In addition, agenesis of the upper third molars and the lower second and third molars were observed in 4-week-old mutant mice. Although the upper second molars were present, they were abnormally small. These results suggest that the C-terminal domain of MSX1 is important for tooth and palate development, and demonstrate that that CRISPR/Cas system can be used as a tool to assess causality of human disorders in vivo and to study the importance of conserved domains in genes.
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Affiliation(s)
- Silvia Naomi Mitsui
- Department of Orthodontics and Dentofacial Orthopedics, Institute of Biomedical Sciences, Tokushima University Graduate School, 3-18-15 Kuramoto-cho, Tokushima 770-8504, Japan.,Division of Molecular Biology, Institute of Advanced Enzyme Research, Tokushima University, 3-18-15 Kuramoto-cho, Tokushima 770-8503, Japan
| | - Akihiro Yasue
- Department of Orthodontics and Dentofacial Orthopedics, Institute of Biomedical Sciences, Tokushima University Graduate School, 3-18-15 Kuramoto-cho, Tokushima 770-8504, Japan
| | - Kiyoshi Masuda
- Department of Human Genetics, Institute of Biomedical Sciences, Tokushima University Graduate School, 3-18-15 Kuramoto-cho, Tokushima 770-8503, Japan
| | - Takuya Naruto
- Department of Human Genetics, Institute of Biomedical Sciences, Tokushima University Graduate School, 3-18-15 Kuramoto-cho, Tokushima 770-8503, 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
| | - Sumihare Noji
- Tokushima University, 2-24 Shinkura-cho, Tokushima 770-8501, Japan
| | - Issei Imoto
- Department of Human Genetics, Institute of Biomedical Sciences, Tokushima University Graduate School, 3-18-15 Kuramoto-cho, Tokushima 770-8503, Japan
| | - Eiji Tanaka
- Department of Orthodontics and Dentofacial Orthopedics, Institute of Biomedical Sciences, Tokushima University Graduate School, 3-18-15 Kuramoto-cho, Tokushima 770-8504, Japan
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22
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MSX1 mutations and associated disease phenotypes: genotype-phenotype relations. Eur J Hum Genet 2016; 24:1663-1670. [PMID: 27381090 DOI: 10.1038/ejhg.2016.78] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2016] [Revised: 05/21/2016] [Accepted: 05/26/2016] [Indexed: 02/06/2023] Open
Abstract
The Msx1 transcription factor is involved in multiple epithelial-mesenchymal interactions during vertebrate embryogenesis. It has pleiotropic effects in several tissues. In humans, MSX1 variants have been related to tooth agenesis, orofacial clefting, and nail dysplasia. We correlate all MSX1 disease causing variants to phenotypic features to shed light on this hitherto unclear association. MSX1 truncations cause more severe phenotypes than in-frame variants. Mutations in the homeodomain always cause tooth agenesis with or without other phenotypes while mutations outside the homeodomain are mostly associated with non-syndromic orofacial clefts. Downstream effects can be further explored by the edgetic perturbation model. This information provides new insights for genetic diagnosis and for further functional analysis of MSX1 variants.
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Korolenkova MV, Starikova NV, Ageeva LV. [Risk factors for teeth aplasia and hypoplasia in cleft lip and palate children]. STOMATOLOGIIA 2016; 95:59-62. [PMID: 26925569 DOI: 10.17116/stomat201695159-62] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The aim of the study was to assess the significance of environmental risk factors for teeth aplasia and hypoplasia in cleft lip and palate children. Two hundred and forty-seven cleft lip and palate (CLP) children were enrolled in the study including 105 (42.5%) with bilateral CLP and 57.5% with unilateral CLP. The mean age was 11.2±4.9 years. Teeth condition was assessed clinically and radiologically. The impact of risk factors for teeth anomalies was analyzed by retrospective data obtained from computer database (absence of preoperative orthopedic treatment, palatal defects after primary palatoplasty and type of primary procedures). Surgical trauma by early periosteoplasty (at the age of 3-4 months), excessive scarring and tissue traction due to absence of early orthopedic treatment and palatal defect were associated with significantly higher incidence of incisors hypoplasia (both developmental enamel defects and microdentia) and aplasia of central incisors not seen in the other study subgroups. Incisors aplasia and hypoplasia in CLP patients do not always have disembryogenic origin but may depend on external environmental factors, including surgical trauma.
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Affiliation(s)
- M V Korolenkova
- Central Research Institute of Dentistry and Maxillofacial Surgery, Moscow, Russia
| | - N V Starikova
- Central Research Institute of Dentistry and Maxillofacial Surgery, Moscow, Russia
| | - L V Ageeva
- Central Research Institute of Dentistry and Maxillofacial Surgery, Moscow, Russia
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Affiliation(s)
- M V Korolenkova
- Central Research Institute of Dentistry and Maxillofacial Surgery, Moscow, Russia
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Liu H, Ding T, Zhan Y, Feng H. A Novel AXIN2 Missense Mutation Is Associated with Non-Syndromic Oligodontia. PLoS One 2015; 10:e0138221. [PMID: 26406231 PMCID: PMC4583461 DOI: 10.1371/journal.pone.0138221] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2015] [Accepted: 08/26/2015] [Indexed: 11/18/2022] Open
Abstract
Oligodontia is defined as the congenital absence of six or more permanent teeth, excluding the third molars. Oligodontia may contribute to masticatory dysfunction, speech alteration, aesthetic problems and malocclusion. Numerous gene mutations have been association with oligodontia. In the present study, we identified a de novo AXIN2 missense mutation (c.314T>G) in a Chinese individual with non-syndromic oligodontia. This mutation results in the substitution of Val at residue 105 for Gly (p.Val105Gly); residue 105 is located in the highly conserved regulator of G protein signaling (RGS) domain of the AXIN2 protein. This is the first report indicating that a mutation in the RGS domain of AXIN2 is responsible for non-syndromic oligodontia. Our study supports the relationship between AXIN2 mutation and non-syndromic oligodontia and extends the mutation spectrum of the AXIN2 gene.
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Affiliation(s)
- Haochen Liu
- Department of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing, China
| | - Tingting Ding
- Department of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing, China
| | - Yuan Zhan
- The Third Dental Center, Peking University School and Hospital of Stomatology, Beijing, China
| | - Hailan Feng
- Department of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing, China
- * E-mail:
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Tatematsu T, Kimura M, Nakashima M, Machida J, Yamaguchi S, Shibata A, Goto H, Nakayama A, Higashi Y, Miyachi H, Shimozato K, Matsumoto N, Tokita Y. An aberrant splice acceptor site due to a novel intronic nucleotide substitution in MSX1 gene is the cause of congenital tooth agenesis in a Japanese family. PLoS One 2015; 10:e0128227. [PMID: 26030286 PMCID: PMC4451150 DOI: 10.1371/journal.pone.0128227] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2015] [Accepted: 04/24/2015] [Indexed: 12/26/2022] Open
Abstract
Congenital tooth agenesis is caused by mutations in the MSX1, PAX9, WNT10A, or AXIN2 genes. Here, we report a Japanese family with nonsyndromic tooth agenesis caused by a novel nucleotide substitution in the intronic region between exons 1 and 2 of the MSX1 gene. Because the mutation is located 9 bp before exon 2 (c.452-9G>A), we speculated that the nucleotide substitution would generate an abnormal splice site. Using cDNA analysis of an immortalized patient blood cell, we confirmed that an additional 7-nucleotide sequence was inserted at the splice junction between exons 1 and 2 (c.451_452insCCCTCAG). The consequent frameshift generated a homeodomain-truncated MSX1 (p.R151fsX20). We then studied the subcellular localization of truncated MSX1 protein in COS cells, and observed that it had a whole cell distribution more than a nuclear localization, compared to that of wild-type protein. This result suggests a deletion of the nuclear localization signal, which is mapped to the MSX1 homeodomain. These results indicate that this novel intronic nucleotide substitution is the cause of tooth agenesis in this family. To date, most MSX1 variants isolated from patients with tooth agenesis involve single amino acid substitutions in the highly conserved homeodomain or deletion mutants caused by frameshift or nonsense mutations. We here report a rare case of an intronic mutation of the MSX1 gene responsible for human tooth agenesis. In addition, the missing tooth patterns were slightly but significantly different between an affected monozygotic twin pair of this family, showing that epigenetic or environmental factors also affect the phenotypic variations of missing teeth among patients with nonsyndromic tooth agenesis caused by an MSX1 haploinsufficiency.
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Affiliation(s)
- Tadashi Tatematsu
- Department of Maxillofacial Surgery, Aichi-Gakuin University School of Dentistry, Nagoya, Aichi, Japan
- Department of Perinatology, Institute for Developmental Research, Aichi-Human Service Center, Kasugai, Aichi, Japan
| | - Masashi Kimura
- Department of Maxillofacial Surgery, Aichi-Gakuin University School of Dentistry, Nagoya, Aichi, Japan
- Department of Dentistry Oral and Maxillofacial Surgery, Ogaki Municipal Hospital, Ogaki, Gifu, Japan
- Department of Perinatology, Institute for Developmental Research, Aichi-Human Service Center, Kasugai, Aichi, Japan
| | - Mitsuko Nakashima
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Kanagawa, Japan
| | - Junichiro Machida
- Department of Maxillofacial Surgery, Aichi-Gakuin University School of Dentistry, Nagoya, Aichi, Japan
- Department of Oral and Maxillofacial Surgery, Toyota Memorial Hospital, Toyota, Aichi, Japan
| | - Seishi Yamaguchi
- Department of Maxillofacial Surgery, Aichi-Gakuin University School of Dentistry, Nagoya, Aichi, Japan
- Department of Dentistry and Oral Surgery, Aichi Children’s Health and Medical Center, Obu, Aichi, Japan
| | - Akio Shibata
- Department of Maxillofacial Surgery, Aichi-Gakuin University School of Dentistry, Nagoya, Aichi, Japan
- Department of Perinatology, Institute for Developmental Research, Aichi-Human Service Center, Kasugai, Aichi, Japan
| | - Hiroki Goto
- Department of Maxillofacial Surgery, Aichi-Gakuin University School of Dentistry, Nagoya, Aichi, Japan
- Department of Perinatology, Institute for Developmental Research, Aichi-Human Service Center, Kasugai, Aichi, Japan
| | - Atsuo Nakayama
- Department of Embryology, Institute for Developmental Research, Aichi-Human Service Center, Kasugai, Aichi, Japan
| | - Yujiro Higashi
- Department of Perinatology, Institute for Developmental Research, Aichi-Human Service Center, Kasugai, Aichi, Japan
| | - Hitoshi Miyachi
- Department of Maxillofacial Surgery, Aichi-Gakuin University School of Dentistry, Nagoya, Aichi, Japan
| | - Kazuo Shimozato
- Department of Maxillofacial Surgery, Aichi-Gakuin University School of Dentistry, Nagoya, Aichi, Japan
| | - Naomichi Matsumoto
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Kanagawa, Japan
| | - Yoshihito Tokita
- Department of Perinatology, Institute for Developmental Research, Aichi-Human Service Center, Kasugai, Aichi, Japan
- * E-mail:
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Hellen EHB, Kern AD. The role of DNA insertions in phenotypic differentiation between humans and other primates. Genome Biol Evol 2015; 7:1168-78. [PMID: 25635043 PMCID: PMC4419785 DOI: 10.1093/gbe/evv012] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
What makes us human is one of the most interesting and enduring questions in evolutionary biology. To assist in answering this question, we have identified insertions in the human genome which cannot be found in five comparison primate species: Chimpanzee, gorilla, orangutan, gibbon, and macaque. A total of 21,269 nonpolymorphic human-specific insertions were identified, of which only 372 were found in exons. Any function conferred by the remaining 20,897 is likely to be regulatory. Many of these insertions are likely to have been fitness neutral; however, a small number has been identified in genes showing signs of positive selection. Insertions found within positively selected genes show associations to neural phenotypes, which were also enriched in the whole data set. Other phenotypes that are found to be enriched in the data set include dental and sensory perception-related phenotypes, features which are known to differ between humans and other apes. The analysis provides several likely candidates, either genes or regulatory regions, which may be involved in the processes that differentiate humans from other apes.
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Affiliation(s)
| | - Andrew D Kern
- Department of Genetics, Nelson Biolabs, Piscataway, NJ, USA
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