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Ruspita I, Das P, Miyoshi K, Noma T, Snead ML, Bei M. Enam expression is regulated by Msx2. Dev Dyn 2023; 252:1292-1302. [PMID: 37191055 PMCID: PMC10592542 DOI: 10.1002/dvdy.598] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Revised: 03/30/2023] [Accepted: 04/12/2023] [Indexed: 05/17/2023] Open
Abstract
BACKGROUND The precise formation of mineralized dental tissues such as enamel and/or dentin require tight transcriptional control of the secretion of matrix proteins. Here, we have investigated the transcriptional regulation of the second most prominent enamel matrix protein, enamelin, and its regulation through the major odontogenic transcription factor, MSX2. RESULTS Using in vitro and in vivo approaches, we identified that (a) Enam expression is reduced in the Msx2 mouse mutant pre-secretory and secretory ameloblasts, (b) Enam is an early response gene whose expression is under the control of Msx2, (c) Msx2 binds to Enam promoter in vitro, suggesting that enam is a direct target for Msx2 and that (d) Msx2 alone represses Enam gene expression. CONCLUSIONS Collectively, these results illustrate that Enam gene expression is controlled by Msx2 in a spatio-temporal manner. They also suggest that Msx2 may interact with other transcription factors to control spatial and temporal expression of Enam and hence amelogenesis and enamel biomineralization.
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Affiliation(s)
- Intan Ruspita
- Center for Regenerative and Developmental Biology, The Forsyth Institute, Cambridge, MA, USA
- Universitas Gadjah Mada, Yogyakarta, Indonesia
| | - Pragnya Das
- Center for Regenerative and Developmental Biology, The Forsyth Institute, Cambridge, MA, USA
- Cooper University Hospital, Camden, NJ, USA
| | - Keiko Miyoshi
- Department of Molecular Biology, Institute of Biomedical Sciences, Tokushima University, Tokushima, Japan
| | - Takafumi Noma
- Faculty of Human Life Studies, Hiroshima Jogakuin University, Hiroshima, Japan
| | - Malcolm L. Snead
- Center for Craniofacial Molecular Biology, Herman Ostrow School of Dentistry of USC, University of Southern California, LA, CA
| | - Marianna Bei
- Center for Engineering in Medicine and Surgery, Department of Surgery, Massachusetts General Hospital, Boston MA, USA
- Department of Surgery, Harvard Medical School, Boston MA, USA
- Shriners Hospital for Children, Boston, MA
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Zhang J, Xu Y, Zhao Y, Bai J, Xu M, Li C, Li J, Ren Y, Xu C, Gao Y, Sun Y, Liu X. The absence of muscle segment homeobox 2 leads to the pyroptosis of ameloblasts by inducing squamous epithelial hyperplasia in the enamel organ. J Cell Mol Med 2021; 25:6429-6437. [PMID: 34041852 PMCID: PMC8256348 DOI: 10.1111/jcmm.16646] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Revised: 03/03/2021] [Accepted: 04/23/2021] [Indexed: 12/14/2022] Open
Abstract
Muscle segment homeobox 2 (MSX2) has been confirmed to be involved in the regulation of early tooth development. However, the role of MSX2 has not been fully elucidated in enamel development. To research the functions of MSX2 in enamel formation, we used a Msx2-/- (KO) mouse model with no full Msx2 gene. In the present study, the dental appearance and enamel microstructure were detected by scanning electron microscopy and micro-computed tomography. The results showed that the absence of Msx2 resulted in enamel defects, leading to severe tooth wear in KO mice. To further investigate the mechanism behind the phenotype, we performed detailed histological analyses of the enamel organ in KO mice. We discovered that ameloblasts without Msx2 could secrete a small amount of enamel matrix protein in the early stage. However, the enamel epithelium occurred squamous epithelial hyperplasia and partial keratinization in the enamel organ during subsequent developmental stages. Ameloblasts depolarized and underwent pyroptosis. Overall, during the development of enamel, MSX2 affects the formation of enamel by regulating the function of epithelial cells in the enamel organ.
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Affiliation(s)
- Juanjuan Zhang
- Department of Oral BiologySchool of Bioscience and TechnologyWeifang Medical UniversityWeifangChina
| | - Ying Xu
- Department of Oral BiologySchool of Bioscience and TechnologyWeifang Medical UniversityWeifangChina
| | - Ying Zhao
- Department of Oral BiologySchool of Bioscience and TechnologyWeifang Medical UniversityWeifangChina
| | - Jingkun Bai
- Department of Oral BiologySchool of Bioscience and TechnologyWeifang Medical UniversityWeifangChina
| | - Mengge Xu
- Department of Oral BiologySchool of Bioscience and TechnologyWeifang Medical UniversityWeifangChina
| | - Chuanji Li
- Department of Oral BiologySchool of Bioscience and TechnologyWeifang Medical UniversityWeifangChina
| | - Jinyue Li
- Department of Oral BiologySchool of Bioscience and TechnologyWeifang Medical UniversityWeifangChina
| | - Yong Ren
- Department of Oral BiologySchool of Bioscience and TechnologyWeifang Medical UniversityWeifangChina
| | - Chang Xu
- Department of Pediatric DentistryBinzhou Medical UniversityYantaiChina
| | - Yuguang Gao
- Department of Pediatric DentistryBinzhou Medical UniversityYantaiChina
| | - Yan Sun
- Department of Oral BiologySchool of Bioscience and TechnologyWeifang Medical UniversityWeifangChina
| | - Xiaoying Liu
- Department of Oral BiologySchool of Bioscience and TechnologyWeifang Medical UniversityWeifangChina
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Zhao YJ, Xiao J, Huangyang MD, Zhao R, Wang Q, Zhang Y, Li JT. Transcriptome sequencing and analysis for the pigmentation of scale and skin in common carp (Cyprinus carpio). Mol Biol Rep 2021; 48:2399-2410. [PMID: 33742327 DOI: 10.1007/s11033-021-06273-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Accepted: 03/09/2021] [Indexed: 11/27/2022]
Abstract
BACKGROUND Teleost scale not only provides a protective layer resisting penetration and pathogens but also participate in coloration. It is interesting to study the mechanism of teleost scale formation. Furthermore, whether there existed consensus genes between scale coloration and skin coloration has not been examined yet. METHODS AND RESULTS We analyzed the transcriptome profiles of red scale, white scale, red skin, and white skin of common carp (Cyprinus carpio). Pair-wise comparison identified 3391 differentially expressed genes (DEGs) between scale and skin, respectively. The 1765 up-regulated genes (UEGs) in scale, as the down-regulated genes in skin, preferred mineralization and other scale development-related processes. The 1626 skin UEGs were enriched in the morphogenesis of skin and appendages. We also identified 195 UEGs in white scale and 223 UEGs in red scale. The white scale UEGs primarily participated in regulation of growth and cell migration. The UEGs in red scale preferred pigment cell differentiation and retinoid metabolic process. A total of 22 DEGs had consensus expression patterns in skin and scale of the same coloration. The expression levels of these DEGs clearly grouped skin and scale of the same coloration together with principle component analysis and correlation analysis. Eleven consensus DEGs were homologous to the orthologs of Poropuntius huangchuchieni, 82% of which were under strong purifying selection. Eight processes including lipid storage and lipid catabolism were shared in both scale pigmentation and skin pigmentation. CONCLUSIONS We identified consensus DEGs and biological processes in scale and skin pigmentation. Our transcriptome analysis will contribute to further elucidation of mechanisms of teleost scale formation and coloration.
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Affiliation(s)
- Yu-Jie Zhao
- College of Fisheries and Life, Shanghai Ocean University, Shanghai, 201306, China
- Key Laboratory of Aquatic Genomics, Ministry of Agriculture and Rural Affairs, Beijing Key Laboratory of Fishery Biotechnology, Chinese Academy of Fishery Sciences, Beijing, 100141, China
| | - Jun Xiao
- College of Fisheries and Life, Shanghai Ocean University, Shanghai, 201306, China
- Key Laboratory of Aquatic Genomics, Ministry of Agriculture and Rural Affairs, Beijing Key Laboratory of Fishery Biotechnology, Chinese Academy of Fishery Sciences, Beijing, 100141, China
| | - Mei-Di Huangyang
- College of Fisheries and Life, Shanghai Ocean University, Shanghai, 201306, China
- Key Laboratory of Aquatic Genomics, Ministry of Agriculture and Rural Affairs, Beijing Key Laboratory of Fishery Biotechnology, Chinese Academy of Fishery Sciences, Beijing, 100141, China
| | - Ran Zhao
- Key Laboratory of Aquatic Genomics, Ministry of Agriculture and Rural Affairs, Beijing Key Laboratory of Fishery Biotechnology, Chinese Academy of Fishery Sciences, Beijing, 100141, China
| | - Qi Wang
- Key Laboratory of Aquatic Genomics, Ministry of Agriculture and Rural Affairs, Beijing Key Laboratory of Fishery Biotechnology, Chinese Academy of Fishery Sciences, Beijing, 100141, China
| | - Yan Zhang
- Key Laboratory of Aquatic Genomics, Ministry of Agriculture and Rural Affairs, Beijing Key Laboratory of Fishery Biotechnology, Chinese Academy of Fishery Sciences, Beijing, 100141, China
| | - Jiong-Tang Li
- Key Laboratory of Aquatic Genomics, Ministry of Agriculture and Rural Affairs, Beijing Key Laboratory of Fishery Biotechnology, Chinese Academy of Fishery Sciences, Beijing, 100141, China.
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Hericium erinaceus potentially rescues behavioural motor deficits through ERK-CREB-PSD95 neuroprotective mechanisms in rat model of 3-acetylpyridine-induced cerebellar ataxia. Sci Rep 2020; 10:14945. [PMID: 32913245 PMCID: PMC7483741 DOI: 10.1038/s41598-020-71966-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2019] [Accepted: 08/24/2020] [Indexed: 12/17/2022] Open
Abstract
Cerebellar ataxia is a neurodegenerative disorder with no definitive treatment. Although several studies have demonstrated the neuroprotective effects of Hericium erinaceus (H.E.), its mechanisms in cerebellar ataxia remain largely unknown. Here, we investigated the neuroprotective effects of H.E. treatment in an animal model of 3-acetylpyridine (3-AP)-induced cerebellar ataxia. Animals administered 3-AP injection exhibited remarkable impairments in motor coordination and balance. There were no significant effects of 25 mg/kg H.E. on the 3-AP treatment group compared to the 3-AP saline group. Interestingly, there was also no significant difference in the 3-AP treatment group compared to the non-3-AP control, indicating a potential rescue of motor deficits. Our results revealed that 25 mg/kg H.E. normalised the neuroplasticity-related gene expression to the level of non-3-AP control. These findings were further supported by increased protein expressions of pERK1/2-pCREB-PSD95 as well as neuroprotective effects on cerebellar Purkinje cells in the 3-AP treatment group compared to the 3-AP saline group. In conclusion, our findings suggest that H.E. potentially rescued behavioural motor deficits through the neuroprotective mechanisms of ERK-CREB-PSD95 in an animal model of 3-AP-induced cerebellar ataxia.
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Hirsch N, Eshel R, Bar Yaacov R, Shahar T, Shmulevich F, Dahan I, Levaot N, Kaplan T, Lupiáñez DG, Birnbaum RY. Unraveling the transcriptional regulation of TWIST1 in limb development. PLoS Genet 2018; 14:e1007738. [PMID: 30372441 PMCID: PMC6233932 DOI: 10.1371/journal.pgen.1007738] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2018] [Revised: 11/13/2018] [Accepted: 10/03/2018] [Indexed: 12/13/2022] Open
Abstract
The transcription factor TWIST1 plays a vital role in mesoderm development, particularly in limb and craniofacial formation. Accordingly, haploinsufficiency of TWIST1 can cause limb and craniofacial malformations as part of Saethre-Chotzen syndrome. However, the molecular basis of TWIST1 transcriptional regulation during development has yet to be elucidated. Here, we characterized active enhancers in the TWIST1-HDAC9 locus that drive transcription in the developing limb and branchial arches. Using available p300 and H3K27ac ChIP-seq data, we identified 12 enhancer candidates, located both within and outside the coding sequences of the neighboring gene, Histone deacetyase 9 (HDAC9). Using zebrafish and mouse enhancer assays, we showed that eight of these candidates have limb/fin and branchial arch enhancer activity that resemble Twist1 expression. Using 4C-seq, we showed that the Twist1 promoter region interacts with three enhancers (eTw-5, 6, 7) in the limb bud and branchial arch of mouse embryos at day 11.5. Furthermore, we found that two transcription factors, LMX1B and TFAP2, bind these enhancers and modulate their enhancer activity. Finally, using CRISPR/Cas9 genome editing, we showed that homozygous deletion of eTw5-7 enhancers reduced Twist1 expression in the limb bud and caused pre-axial polydactyly, a phenotype observed in Twist1+/- mice. Taken together, our findings reveal that each enhancer has a discrete activity pattern, and together comprise a spatiotemporal regulatory network of Twist1 transcription in the developing limbs/fins and branchial arches. Our study suggests that mutations in TWIST1 enhancers could lead to reduced TWIST1 expression, resulting in phenotypic outcome as seen with TWIST1 coding mutations.
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Affiliation(s)
- Naama Hirsch
- Department of Life Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
- Center for Evolutionary Genomics and Medicine, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Reut Eshel
- Department of Life Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
- Center for Evolutionary Genomics and Medicine, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Reut Bar Yaacov
- Department of Life Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
- Center for Evolutionary Genomics and Medicine, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Tal Shahar
- Department of Life Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
- Center for Evolutionary Genomics and Medicine, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Fania Shmulevich
- Department of Life Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
- Center for Evolutionary Genomics and Medicine, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Idit Dahan
- Department of Life Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
- Center for Evolutionary Genomics and Medicine, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Noam Levaot
- Department of Physiology and Cell Biology, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Tommy Kaplan
- School of Computer Science and Engineering, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Darío G. Lupiáñez
- Max Planck Institute for Molecular Genetics, Berlin, Germany
- Institute for Medical and Human Genetics, Charité-Universitätsmedizin Berlin, Berlin, Germany
- Berlin-Brandenburg Center for Regenerative Therapies, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Ramon Y. Birnbaum
- Department of Life Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
- Center for Evolutionary Genomics and Medicine, Ben-Gurion University of the Negev, Beer-Sheva, Israel
- * E-mail:
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Li Z, Chen G, Yang Y, Guo W, Tian W. Bcl11b regulates enamel matrix protein expression and dental epithelial cell differentiation during rat tooth development. Mol Med Rep 2016; 15:297-304. [PMID: 27959403 DOI: 10.3892/mmr.2016.6030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2015] [Accepted: 09/27/2016] [Indexed: 11/05/2022] Open
Abstract
Amelogenesis, beginning with thickened epithelial aggregation and ending with highly mineralized enamel formation, is a process mediated by a complex signaling network that involves several molecules, including growth and transcription factors. During early tooth development, the transcription factor B‑cell CLL/lymphoma 11B (Bcl11b) participates in dental epithelial cell proliferation and differentiation. However, whether it affects the postnatal regulation of enamel matrix protein expression and ameloblast differentiation remains unclear. To clarify the role of Bcl11b in enamel development, the present study initially detected the protein expression levels of Bcl11b during tooth development using immunohistochemistry, from the embryonic lamina stage to the postnatal period, and demonstrated that Bcl11b is predominantly restricted to cervical loop epithelial cells at the cap and bell stages, whereas expression is reduced in ameloblasts. Notably, the expression pattern of Bcl11b during tooth development differed between rats and mice. Knockdown of Bcl11b by specific small interfering RNA attenuated the expression of enamel‑associated genes, including amelogenin, X‑linked (Amelx), ameloblastin (Ambn), enamelin (Enam), kallikrein related peptidase 4 (Klk4), matrix metallopeptidase 20 and Msh homeobox 2 (Msx2). Chromatin immunoprecipitation assay verified that Msx2 was a transcriptional target of Bcl11b. However, overexpression of Msx2 resulted in downregulation of enamel‑associated genes, including Ambn, Amelx, Enam and Klk4. The present study suggested that Bcl11b serves a potentially important role in the regulation of ameloblast differentiation and enamel matrix protein expression. In addition, a complex feedback regulatory network may exist between Bcl11b and Msx2.
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Affiliation(s)
- Ziyue Li
- National Engineering Laboratory for Oral Regenerative Medicine, West China School of Stomatology, Sichuan University, Chengdu, Sichuan 610041, P.R. China
| | - Guoqing Chen
- National Engineering Laboratory for Oral Regenerative Medicine, West China School of Stomatology, Sichuan University, Chengdu, Sichuan 610041, P.R. China
| | - Yaling Yang
- National Engineering Laboratory for Oral Regenerative Medicine, West China School of Stomatology, Sichuan University, Chengdu, Sichuan 610041, P.R. China
| | - Weihua Guo
- National Engineering Laboratory for Oral Regenerative Medicine, West China School of Stomatology, Sichuan University, Chengdu, Sichuan 610041, P.R. China
| | - Weidong Tian
- National Engineering Laboratory for Oral Regenerative Medicine, West China School of Stomatology, Sichuan University, Chengdu, Sichuan 610041, P.R. China
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Distorted Patterns of Dentinogenesis and Eruption in Msx2 Null Mutants. THE AMERICAN JOURNAL OF PATHOLOGY 2016; 186:2577-87. [DOI: 10.1016/j.ajpath.2016.06.013] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2016] [Revised: 05/16/2016] [Accepted: 06/09/2016] [Indexed: 01/20/2023]
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Babajko S, de La Dure-Molla M, Jedeon K, Berdal A. MSX2 in ameloblast cell fate and activity. Front Physiol 2015; 5:510. [PMID: 25601840 PMCID: PMC4283505 DOI: 10.3389/fphys.2014.00510] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2014] [Accepted: 12/08/2014] [Indexed: 11/29/2022] Open
Abstract
While many effectors have been identified in enamel matrix and cells via genetic studies, physiological networks underlying their expression levels and thus the natural spectrum of enamel thickness and degree of mineralization are now just emerging. Several transcription factors are candidates for enamel gene expression regulation and thus the control of enamel quality. Some of these factors, such as MSX2, are mainly confined to the dental epithelium. MSX2 homeoprotein controls several stages of the ameloblast life cycle. This chapter introduces MSX2 and its target genes in the ameloblast and provides an overview of knowledge regarding its effects in vivo in transgenic mouse models. Currently available in vitro data on the role of MSX2 as a transcription factor and its links to other players in ameloblast gene regulation are considered. MSX2 modulations are relevant to the interplay between developmental, hormonal and environmental pathways and in vivo investigations, notably in the rodent incisor, have provided insight into dental physiology. Indeed, in vivo models are particularly promising for investigating enamel formation and MSX2 function in ameloblast cell fate. MSX2 may be central to the temporal-spatial restriction of enamel protein production by the dental epithelium and thus regulation of enamel quality (thickness and mineralization level) under physiological and pathological conditions. Studies on MSX2 show that amelogenesis is not an isolated process but is part of the more general physiology of coordinated dental-bone complex growth.
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Affiliation(s)
- Sylvie Babajko
- Laboratory of Molecular Oral Pathophysiology, Centre de Recherche des Cordeliers, Institut National de la Santé et de la Recherche Médicale, UMRS 1138 Paris, France ; Laboratory of Molecular Oral Pathophysiology, Centre de Recherche des Cordeliers, Université Paris-Descartes Paris, France ; Laboratory of Molecular Oral Pathophysiology, Centre de Recherche des Cordeliers, Université Pierre et Marie Curie-Paris Paris, France ; Laboratory of Molecular Oral Pathophysiology, Centre de Recherche des Cordeliers, Université Paris-Diderot Paris, France
| | - Muriel de La Dure-Molla
- Laboratory of Molecular Oral Pathophysiology, Centre de Recherche des Cordeliers, Institut National de la Santé et de la Recherche Médicale, UMRS 1138 Paris, France ; Laboratory of Molecular Oral Pathophysiology, Centre de Recherche des Cordeliers, Université Paris-Descartes Paris, France ; Laboratory of Molecular Oral Pathophysiology, Centre de Recherche des Cordeliers, Université Pierre et Marie Curie-Paris Paris, France ; Laboratory of Molecular Oral Pathophysiology, Centre de Recherche des Cordeliers, Université Paris-Diderot Paris, France ; Centre de Référence des Maladies Rares de la Face et de la Cavité Buccale MAFACE, Hôpital Rothschild Paris, France
| | - Katia Jedeon
- Laboratory of Molecular Oral Pathophysiology, Centre de Recherche des Cordeliers, Institut National de la Santé et de la Recherche Médicale, UMRS 1138 Paris, France ; Laboratory of Molecular Oral Pathophysiology, Centre de Recherche des Cordeliers, Université Paris-Descartes Paris, France ; Laboratory of Molecular Oral Pathophysiology, Centre de Recherche des Cordeliers, Université Pierre et Marie Curie-Paris Paris, France ; Laboratory of Molecular Oral Pathophysiology, Centre de Recherche des Cordeliers, Université Paris-Diderot Paris, France
| | - Ariane Berdal
- Laboratory of Molecular Oral Pathophysiology, Centre de Recherche des Cordeliers, Institut National de la Santé et de la Recherche Médicale, UMRS 1138 Paris, France ; Laboratory of Molecular Oral Pathophysiology, Centre de Recherche des Cordeliers, Université Paris-Descartes Paris, France ; Laboratory of Molecular Oral Pathophysiology, Centre de Recherche des Cordeliers, Université Pierre et Marie Curie-Paris Paris, France ; Laboratory of Molecular Oral Pathophysiology, Centre de Recherche des Cordeliers, Université Paris-Diderot Paris, France ; Centre de Référence des Maladies Rares de la Face et de la Cavité Buccale MAFACE, Hôpital Rothschild Paris, France
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