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Kularbkaew T, Thongmak T, Sandeth P, Durward CS, Vittayakittipong P, Duke P, Iamaroon A, Kintarak S, Intachai W, Ngamphiw C, Tongsima S, Jatooratthawichot P, Cox TC, Ketudat Cairns JR, Kantaputra P. Genetic Variants in the TBC1D2B Gene Are Associated with Ramon Syndrome and Hereditary Gingival Fibromatosis. Int J Mol Sci 2024; 25:8867. [PMID: 39201553 PMCID: PMC11354241 DOI: 10.3390/ijms25168867] [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: 06/20/2024] [Revised: 07/28/2024] [Accepted: 08/05/2024] [Indexed: 09/02/2024] Open
Abstract
Ramon syndrome (MIM 266270) is an extremely rare genetic syndrome, characterized by gingival fibromatosis, cherubism-like lesions, epilepsy, intellectual disability, hypertrichosis, short stature, juvenile rheumatoid arthritis, and ocular abnormalities. Hereditary or non-syndromic gingival fibromatosis (HGF) is also rare and considered to represent a heterogeneous group of disorders characterized by benign, slowly progressive, non-inflammatory gingival overgrowth. To date, two genes, ELMO2 and TBC1D2B, have been linked to Ramon syndrome. The objective of this study was to further investigate the genetic variants associated with Ramon syndrome as well as HGF. Clinical, radiographic, histological, and immunohistochemical examinations were performed on affected individuals. Exome sequencing identified rare variants in TBC1D2B in both conditions: a novel homozygous variant (c.1879_1880del, p.Glu627LysfsTer61) in a Thai patient with Ramon syndrome and a rare heterozygous variant (c.2471A>G, p.Tyr824Cys) in a Cambodian family with HGF. A novel variant (c.892C>T, p.Arg298Cys) in KREMEN2 was also identified in the individuals with HGF. With support from mutant protein modeling, our data suggest that TBC1D2B variants contribute to both Ramon syndrome and HGF, although variants in additional genes might also contribute to the pathogenesis of HGF.
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Affiliation(s)
- Thatphicha Kularbkaew
- Center of Excellence in Medical Genetics Research, Faculty of Dentistry, Chiang Mai University, Chiang Mai 50200, Thailand; (T.K.); (W.I.)
- Division of Pediatric Dentistry, Faculty of Dentistry, Chiang Mai University, Chiang Mai 50200, Thailand
| | | | - Phan Sandeth
- Department of Oral and Maxillofacial Surgery, Preah Ang Duong Hospital, Phnom Penh 120201, Cambodia;
| | - Callum S. Durward
- Faculty of Dentistry, University of Puthisastra, Phnom Penh 120201, Cambodia;
| | - Pichai Vittayakittipong
- Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Prince of Songkla University, Songkhla 90110, Thailand;
| | - Paul Duke
- Royal Adelaide Hospital, Adelaide, SA 5000, Australia;
| | - Anak Iamaroon
- Department of Oral Biology and Diagnostic Sciences, Faculty of Dentistry, Chiang Mai University, Chiang Mai 50200, Thailand;
| | - Sompid Kintarak
- Department of Oral Diagnostic Sciences, Faculty of Dentistry, Prince of Songkla University, Songkhla 90110, Thailand;
| | - Worrachet Intachai
- Center of Excellence in Medical Genetics Research, Faculty of Dentistry, Chiang Mai University, Chiang Mai 50200, Thailand; (T.K.); (W.I.)
| | - Chumpol Ngamphiw
- National Biobank of Thailand, National Center for Genetic Engineering and Biotechnology, Thailand Science Park, Pathum Thani 12120, Thailand; (C.N.); (S.T.)
| | - Sissades Tongsima
- National Biobank of Thailand, National Center for Genetic Engineering and Biotechnology, Thailand Science Park, Pathum Thani 12120, Thailand; (C.N.); (S.T.)
| | - Peeranat Jatooratthawichot
- School of Chemistry, Institute of Science, and Center for Biomolecular Structure, Function and Application, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand; (P.J.); (J.R.K.C.)
| | - Timothy C. Cox
- Departments of Oral & Craniofacial Sciences, School of Dentistry, and Pediatrics, School of Medicine, University of Missouri-Kansas City, Kansas City, MO 64108, USA;
| | - James R. Ketudat Cairns
- School of Chemistry, Institute of Science, and Center for Biomolecular Structure, Function and Application, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand; (P.J.); (J.R.K.C.)
| | - Piranit Kantaputra
- Center of Excellence in Medical Genetics Research, Faculty of Dentistry, Chiang Mai University, Chiang Mai 50200, Thailand; (T.K.); (W.I.)
- Division of Pediatric Dentistry, Faculty of Dentistry, Chiang Mai University, Chiang Mai 50200, Thailand
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Salvi GE, Roccuzzo A, Imber JC, Stähli A, Klinge B, Lang NP. Clinical periodontal diagnosis. Periodontol 2000 2023. [PMID: 37452444 DOI: 10.1111/prd.12487] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Revised: 02/16/2023] [Accepted: 03/14/2023] [Indexed: 07/18/2023]
Abstract
Periodontal diseases include pathological conditions elicited by the presence of bacterial biofilms leading to a host response. In the diagnostic process, clinical signs such as bleeding on probing, development of periodontal pockets and gingival recessions, furcation involvement and presence of radiographic bone loss should be assessed prior to periodontal therapy, following active therapy, and during long-term supportive care. In addition, patient-reported outcomes such as increased tooth mobility, migration, and tilting should also be considered. More important to the patient, however, is the fact that assessment of signs of periodontal diseases must be followed by an appropriate treatment plan. Furthermore, it should be realized that clinical and radiographic periodontal diagnosis is based on signs which may not reflect the presence of active disease but rather represent the sequelae of a previous bacterial challenge. Hence, the aim of the present review is to provide a summary of clinical and radiographic diagnostic criteria required to classify patients with periodontal health or disease.
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Affiliation(s)
- Giovanni E Salvi
- Department of Periodontology, School of Dental Medicine, University of Bern, Bern, Switzerland
| | - Andrea Roccuzzo
- Department of Periodontology, School of Dental Medicine, University of Bern, Bern, Switzerland
| | - Jean-Claude Imber
- Department of Periodontology, School of Dental Medicine, University of Bern, Bern, Switzerland
| | - Alexandra Stähli
- Department of Periodontology, School of Dental Medicine, University of Bern, Bern, Switzerland
| | - Björn Klinge
- Department of Periodontology, Faculty of Odontology, Malmö University, Malmö, Sweden
- Division of Oral Diseases, Department of Dental Medicine, Karolinska Institute, Stockholm, Sweden
| | - Niklaus P Lang
- Department of Periodontology, School of Dental Medicine, University of Bern, Bern, Switzerland
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Rahikkala E, Julku J, Koskinen S, Keski-Filppula T, Weissgraeber S, Bertoli-Avella AM, Häkli S, Kraatari-Tiri M. Pathogenic REST variant causing Jones syndrome and a review of the literature. Eur J Hum Genet 2022; 31:469-473. [PMID: 36509837 PMCID: PMC10133349 DOI: 10.1038/s41431-022-01258-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2022] [Revised: 10/30/2022] [Accepted: 11/24/2022] [Indexed: 12/15/2022] Open
Abstract
Jones syndrome is a rare dominantly inherited syndrome characterized by gingival fibromatosis and progressive sensorineural hearing loss becoming symptomatic in the second decade of life. Here, we report a father and his two daughters presenting with a typical Jones syndrome (OMIM %135550) phenotype. Exome sequencing identified a repressor element 1-silencing transcription factor (REST, OMIM *600571) (NM_005612.5) c.2670_2673del p.(Glu891Profs*6) heterozygous variant segregating with Jones syndrome in the family. We review the clinical data from all previously published patients with Jones syndrome and previously published patients with pathogenic REST variants associated with gingival fibromatosis or sensorineural hearing loss. This study suggests that pathogenic REST variants cause Jones syndrome.
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Affiliation(s)
- Elisa Rahikkala
- PEDEGO Research Unit, University of Oulu, Oulu, Finland. .,Department of Clinical Genetics and Medical Research Center, Oulu University Hospital, Oulu, Finland.
| | - Johanna Julku
- Department of Oral and Maxillofacial Diseases, Oulu University Hospital, Oulu, Finland
| | - Sari Koskinen
- Department of Oral and Maxillofacial Diseases, Oulu University Hospital, Oulu, Finland
| | - Tommi Keski-Filppula
- PEDEGO Research Unit, University of Oulu, Oulu, Finland.,Department of Clinical Genetics and Medical Research Center, Oulu University Hospital, Oulu, Finland
| | | | | | - Sanna Häkli
- PEDEGO Research Unit, University of Oulu, Oulu, Finland.,Department of Otorhinolaryngology and Phoniatrics, Oulu University Hospital, Oulu, Finland
| | - Minna Kraatari-Tiri
- PEDEGO Research Unit, University of Oulu, Oulu, Finland.,Department of Clinical Genetics and Medical Research Center, Oulu University Hospital, Oulu, Finland
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