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Bouzid A, Chelly A, Tekari A, Singh N, Hansdah K, Achour I, Ben Ayed I, Jbeli F, Charfeddine I, Ramchander PV, Hamoudi R, Masmoudi S. Genetic Association of rs1021188 and DNA Methylation Signatures of TNFSF11 in the Risk of Conductive Hearing Loss. Front Med (Lausanne) 2022; 9:870244. [PMID: 35510247 PMCID: PMC9058115 DOI: 10.3389/fmed.2022.870244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2022] [Accepted: 03/08/2022] [Indexed: 11/25/2022] Open
Abstract
Otosclerosis (OTSC) is a complex bone disorder of the otic capsule, which causes conductive hearing impairment in human adults. The dysregulation of the signaling axis mediated by the receptor activator of nuclear factor-kappa-B (RANK), RANK ligand (RANKL), and osteoprotegerin has been widely attributed to the context of metabolic bone disorders. While genetic associations and epigenetic alterations in the TNFSF11 gene (RANKL) have been well-linked to metabolic bone diseases of the skeleton, particularly osteoporosis, they have never been addressed in OTSC. This study aimed to assess whether the genetic association of rs1021188 polymorphism in the upstream of TNFSF11 and the DNA methylation changes in its promoter CpG-region reveal the susceptibility of OTSC. Peripheral blood DNA samples were collected from unrelated Tunisian-North African subjects for genotyping (109 cases and 120 controls) and for DNA methylation analysis (40 cases and 40 controls). The gender-stratified analysis showed that the TNFSF11 rs1021188 C/T was associated with OTSC in men (p = 0.023), but not in women (p = 0.458). Individuals with CC genotype were more susceptible to OTSC, suggesting an increased risk to disease development. Using publicly available data, the rs1021188 was within a cluster grouping the subpopulations with African ethnicity. Moreover, 26 loci in the TNFSF11 gene were in linkage disequilibrium with rs1021188, revealing relative similarities between different populations. Significant differences in both DNA methylation and unmethylation status were detected with 4.53- and 4.83-fold decreases in the global DNA methylation levels in female and male OTSC groups, respectively. These changes could contribute to an increased risk of OTSC development. Bioinformatic analyses indicated that each of the rs1021188 variations and the DNA methylation changes in the promoter CpG-sites within TNFSF11 may play an important role in its transcription regulation. To our knowledge, this is the first study that investigates an independent effect of the rs1021188 polymorphism and DNA hypomethylation of TNFSF11 promoter in OTSC. Genetic and epigenetic changes in the regulatory regions of TNFSF11 could offer new molecular insights into the understanding of the complexity of OTSC.
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Affiliation(s)
- Amal Bouzid
- Sharjah Institute for Medical Research, College of Medicine, University of Sharjah, Sharjah, United Arab Emirates
- Laboratory of Molecular and Cellular Screening Processes, Centre of Biotechnology of Sfax, University of Sfax, Sfax, Tunisia
- *Correspondence: Amal Bouzid
| | - Ameni Chelly
- Laboratory of Molecular and Cellular Screening Processes, Centre of Biotechnology of Sfax, University of Sfax, Sfax, Tunisia
| | - Adel Tekari
- Laboratory of Molecular and Cellular Screening Processes, Centre of Biotechnology of Sfax, University of Sfax, Sfax, Tunisia
| | - Neha Singh
- Institute of Life Sciences, Nalco Square, Bhubaneswar, India
| | - Kirtal Hansdah
- Institute of Life Sciences, Nalco Square, Bhubaneswar, India
| | - Imen Achour
- Department of Otorhinolaryngology, Habib Bourguiba Hospital, University of Sfax, Sfax, Tunisia
| | - Ikhlas Ben Ayed
- Medical Genetic Department, University Hedi Chaker Hospital of Sfax, Sfax, Tunisia
| | - Fida Jbeli
- Laboratory of Molecular and Cellular Screening Processes, Centre of Biotechnology of Sfax, University of Sfax, Sfax, Tunisia
| | - Ilhem Charfeddine
- Department of Otorhinolaryngology, Habib Bourguiba Hospital, University of Sfax, Sfax, Tunisia
| | | | - Rifat Hamoudi
- Sharjah Institute for Medical Research, College of Medicine, University of Sharjah, Sharjah, United Arab Emirates
- Division of Surgery and Interventional Science, University College London, London, United Kingdom
| | - Saber Masmoudi
- Laboratory of Molecular and Cellular Screening Processes, Centre of Biotechnology of Sfax, University of Sfax, Sfax, Tunisia
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Zhang Y, Tang Q, Xue R, Zhu X, Yang H, Gao Z. Analysis of the Genetic Characteristics of a Chinese Family With Otosclerosis. EAR, NOSE & THROAT JOURNAL 2021; 100:774S-780S. [PMID: 32126815 DOI: 10.1177/0145561320910627] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND Otosclerosis is a focal lesion of the inner ear. The role of genetic factors in the pathogenesis of otosclerosis has received increasing attention. We analyzed the clinical manifestations, inheritance pattern, and pathogenic genes in a family with otosclerosis. METHODS We collected clinical data and generated a family pedigree. High-throughput second-generation sequencing technology was used to identify candidate genes by performing whole-exome sequencing of 7 members of the family, and Sanger sequencing was performed to validate candidate gene mutations in the 7 family members. RESULTS Otosclerosis was characterized by autosomal dominant inheritance in this family. Whole-exome sequencing did not reveal mutation sites in known deafness-related genes. However, a c.2209A > G (p.T737A) mutation was detected in exon 6 of the SP1 gene, which is associated with the COL1A1 gene. This mutation was a pathogenic mutation, and Sanger sequencing confirmed that this mutation cosegregated with the clinical phenotype among the family members. CONCLUSIONS The pattern of otosclerosis in this family is consistent with autosomal dominant inheritance, and the SP1 gene, harboring the c.2209A > G (p.T737A) mutation in exon 6, may be the causative gene of otosclerosis in this family.
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Affiliation(s)
- Yongli Zhang
- Department of Otolaryngology, Chinese Academy of Medical Sciences and Peking Union Medical College, 34732Peking Union Medical College Hospital, Beijing, China
- Translational Medicine Center, 34732Peking Union Medical College Hospital, Beijing, China
| | - Qi Tang
- Department of Otolaryngology, Chinese Academy of Medical Sciences and Peking Union Medical College, 34732Peking Union Medical College Hospital, Beijing, China
- Translational Medicine Center, 34732Peking Union Medical College Hospital, Beijing, China
| | - Ruoyan Xue
- Department of Otolaryngology, Chinese Academy of Medical Sciences and Peking Union Medical College, 34732Peking Union Medical College Hospital, Beijing, China
- Translational Medicine Center, 34732Peking Union Medical College Hospital, Beijing, China
| | - Xiaohui Zhu
- Department of Otolaryngology, Chinese Academy of Medical Sciences and Peking Union Medical College, 34732Peking Union Medical College Hospital, Beijing, China
- Translational Medicine Center, 34732Peking Union Medical College Hospital, Beijing, China
| | - Hua Yang
- Department of Otolaryngology, Chinese Academy of Medical Sciences and Peking Union Medical College, 34732Peking Union Medical College Hospital, Beijing, China
- Translational Medicine Center, 34732Peking Union Medical College Hospital, Beijing, China
| | - Zhiqiang Gao
- Department of Otolaryngology, Chinese Academy of Medical Sciences and Peking Union Medical College, 34732Peking Union Medical College Hospital, Beijing, China
- Translational Medicine Center, 34732Peking Union Medical College Hospital, Beijing, China
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Bouzid A, Tekari A, Jbeli F, Chakroun A, Hansdah K, Souissi A, Singh N, Mosrati MA, Achour I, Ghorbel A, Charfeddine I, Ramchander PV, Masmoudi S. Osteoprotegerin gene polymorphisms and otosclerosis: an additional genetic association study, multilocus interaction and meta-analysis. BMC MEDICAL GENETICS 2020; 21:122. [PMID: 32493243 PMCID: PMC7268516 DOI: 10.1186/s12881-020-01036-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/24/2019] [Accepted: 04/28/2020] [Indexed: 02/07/2023]
Abstract
BACKGROUND Otosclerosis (OTSC) is among the most common causes of a late-onset hearing loss in adults and is characterized by an abnormal bone growth in the otic capsule. Alteration in the osteoprotegerin (OPG) expression has been suggested in the implication of OTSC pathogenesis. METHODS A case-control association study of rs2228568, rs7844539, rs3102734 and rs2073618 single nucleotide polymorphisms (SNPs) in the OPG gene was performed in a Tunisian-North African population composed of 183 unrelated OTSC patients and 177 healthy subjects. In addition, a multilocus association and a meta-analysis of existing studies were conducted. RESULTS Rs3102734 (p = 0.013) and rs2073618 (p = 0.007) were significantly associated with OTSC, which were predominantly detected in females after multiple corrections. Among the OPG studied SNPs, the haplotypes A-A-C-G (p = 0.0001) and A-A-C-C (p = 0.0004) were significantly associated with OTSC in females. Multilocus association revealed that the SNPs: rs2073618 in OPG, rs1800472 in TGFβ1, rs39335, rs39350 and rs39374 in RELN, and rs494252 in chromosome 11 showed significant OTSC-associated alleles in Tunisian individuals. In addition, meta-analysis of the rs2073618 SNP in Tunisian, Indian and Italian populations revealed evidence of an association with OTSC (OR of 0.826, 95% CI [0.691-0.987], p = 0.035). CONCLUSIONS Our findings suggest that rs3102734 and rs2073618 variants are associated with OTSC in North African ethnic Tunisian population. Meta-analysis of the rs2073618 in three different ethnic population groups indicated an association with OTSC.
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Affiliation(s)
- Amal Bouzid
- Laboratory of Molecular and Cellular Screening Processes, Centre of Biotechnology of Sfax, University of Sfax, Road Sidi Mansour Km 6, BP 1177, 3018, Sfax, Tunisia.
| | - Adel Tekari
- Laboratory of Molecular and Cellular Screening Processes, Centre of Biotechnology of Sfax, University of Sfax, Road Sidi Mansour Km 6, BP 1177, 3018, Sfax, Tunisia
| | - Fida Jbeli
- Laboratory of Molecular and Cellular Screening Processes, Centre of Biotechnology of Sfax, University of Sfax, Road Sidi Mansour Km 6, BP 1177, 3018, Sfax, Tunisia
| | - Amine Chakroun
- Department of Otorhinolaryngology, Habib Bourguiba Teaching Hospital, University of Sfax, Avenue El Ferdaws, 3029, Sfax, Tunisia
| | - Kirtal Hansdah
- Institute of Life Sciences, Nalco Square, Chandrasekharpur, Bhubaneswar, Odisha, 751023, India
| | - Amal Souissi
- Laboratory of Molecular and Cellular Screening Processes, Centre of Biotechnology of Sfax, University of Sfax, Road Sidi Mansour Km 6, BP 1177, 3018, Sfax, Tunisia
| | - Neha Singh
- Institute of Life Sciences, Nalco Square, Chandrasekharpur, Bhubaneswar, Odisha, 751023, India
| | - Mohamed Ali Mosrati
- Laboratory of Molecular and Cellular Screening Processes, Centre of Biotechnology of Sfax, University of Sfax, Road Sidi Mansour Km 6, BP 1177, 3018, Sfax, Tunisia
| | - Imen Achour
- Department of Otorhinolaryngology, Habib Bourguiba Teaching Hospital, University of Sfax, Avenue El Ferdaws, 3029, Sfax, Tunisia
| | - Abdelmonem Ghorbel
- Department of Otorhinolaryngology, Habib Bourguiba Teaching Hospital, University of Sfax, Avenue El Ferdaws, 3029, Sfax, Tunisia
| | - Ilhem Charfeddine
- Department of Otorhinolaryngology, Habib Bourguiba Teaching Hospital, University of Sfax, Avenue El Ferdaws, 3029, Sfax, Tunisia
| | | | - Saber Masmoudi
- Laboratory of Molecular and Cellular Screening Processes, Centre of Biotechnology of Sfax, University of Sfax, Road Sidi Mansour Km 6, BP 1177, 3018, Sfax, Tunisia
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Abstract
HYPOTHESIS Investigation of differential protein expression will provide clues to pathophysiology in otosclerosis. BACKGROUND Otosclerosis is a bone remodeling disorder limited to the endochondral layer of the otic capsule within the temporal bone. Some authors have suggested an inflammatory etiology for otosclerosis resulting from persistent measles virus infection involving the otic capsule. Despite numerous genetic studies, implication of candidate genes in the otosclerotic process remains elusive. We employed liquid chromatography-mass spectrometry (LC-MS) analysis on formalin-fixed celloidin-embedded temporal bone tissues for postmortem investigation of otosclerosis. METHODS Proteomic analysis was performed using human temporal bones from a patient with severe otosclerosis and a control temporal bone. Sections were dissected under microscopy to remove otosclerotic lesions and normal otic capsule for proteomic analysis. Tandem 2D chromatography mass spectrometry was employed. Data analysis and peptide matching to FASTA human databases was done using SEQUEST and proteome discoverer software. RESULTS TGFβ1 was identified in otosclerosis but not in the normal control temporal bone specimen. Aside from TGFβ1, many proteins and predicted cDNA-encoded proteins were observed, with implications in cell death and/or proliferation pathways, suggesting a possible role in otosclerotic bone remodeling. Immunostaining using TGFβ1 monoclonal revealed marked staining of the spongiotic otosclerotic lesions. CONCLUSIONS Mechanisms involved in cochlear extension of otosclerosis are still unclear, but the implication of TGFβ1 is supported by the present proteomic data and immunostaining results. The established role of TGFβ1 in the chondrogenesis process supports the theory of a reaction targeting the globulae interossei within the otic capsule.
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Priyadarshi S, Ray CS, Biswal NC, Nayak SR, Panda KC, Desai A, Ramchander PV. Genetic association and altered gene expression of osteoprotegerin in otosclerosis patients. Ann Hum Genet 2015; 79:225-37. [PMID: 25998045 DOI: 10.1111/ahg.12118] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2015] [Accepted: 04/08/2015] [Indexed: 12/14/2022]
Abstract
Otosclerosis (OTSC) is a late-onset hearing disorder characterized by increased bone turnover in the otic capsule. Disturbed osteoprotegerin expression has been found in the otosclerotic foci which may have an important role in the pathogenesis of OTSC. To identify the genetic risk factors, we sequenced the coding region and exon-intron boundaries of the OPG gene in 254 OTSC patients and 262 controls. Sequence analysis identified five known polymorphisms c.9C>G, c.30+15C>T, c.400+4C>T, c.768A>G, and c.817+8A>C. Testing of these SNPs revealed sex specific association with c.9C>G in males and c.30+15C>T in females after multiple correction. Furthermore, meta-analysis provided evidence of association of the c.9C>G polymorphism with OTSC. In secondary analysis, we investigated the mRNA expression of OPG and associated genes RANK and RANKL in otosclerotic tissues compared to controls. Expression analysis revealed significantly missing/reduced OPG expression only in otosclerotic tissues. However, the signal sequence polymorphism c.9C>G has shown no effect on OPG mRNA expression. In conclusion, our results suggest that the risk of OTSC is influenced by variations in the OPG gene along with other factors which might regulate its altered expression in otosclerotic tissues. Further research is warranted to elucidate the mechanisms underlying these observations.
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Affiliation(s)
- Saurabh Priyadarshi
- Institute of Life Sciences, Nalco Square, Chandrasekharpur, Bhubaneswar, India
| | - Chinmay Sundar Ray
- Department of Ear, Nose, and Throat (ENT), Shrirama Chandra Bhanj (SCB) Medical College, Cuttack, India
| | - Narayan Chandra Biswal
- Department of Ear, Nose, and Throat (ENT), Shrirama Chandra Bhanj (SCB) Medical College, Cuttack, India
| | - Soumya Ranjan Nayak
- Department of Forensic Medicine & Toxicology (FMT), Shrirama Chandra Bhanj (SCB) Medical College, Cuttack, India
| | | | - Ashim Desai
- Dr. ABR Desai Ear, Nose and Throat (ENT) Clinic and Research Centre, Mumbai, India
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Priyadarshi S, Ray CS, Panda KC, Desai A, Nayak SR, Biswal NC, Ramchander PV. Genetic association and gene expression profiles of TGFB1 and the contribution of TGFB1 to otosclerosis susceptibility. J Bone Miner Res 2013; 28:2490-7. [PMID: 23703862 DOI: 10.1002/jbmr.1991] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/05/2013] [Revised: 04/25/2013] [Accepted: 05/15/2013] [Indexed: 12/15/2022]
Abstract
Otosclerosis (OTSC) is a common form of acquired hearing loss resulting from disturbed bone remodeling in the otic capsule of the middle ear. Transforming growth factor-beta1 (TGFB1) produced by osteoblasts is the most abundant growth factor in human bone. Previous studies have shown the contribution of single-nucleotide polymorphisms (SNPs) in TGFB1 toward the risk of developing OTSC in some ethnic populations. The present study was aimed at investigating the genetic association and expression profiles of TGFB1 in OTSC patients. Two SNPs (c.-800G > A and c.-509C > T) in the promoter region and three SNPs (c.29T > C, c.74G > C, and c.788C > T) in the coding region were genotyped in 170 cases and 170 controls. The genetic association analysis revealed the significant association between c.-509C > T (p = 0.0067; odds ratio [OR] = 1.562; 95% confidence interval [CI], 1.140-2.139) and OTSC. The increased minor allele "T" frequency in cases (0.42) compared to controls (0.31) indicates its possible role in the etiology of the disease. The minor allele frequencies for the SNPs c.-800G > A, c.29T > C, and c.74G >C were similar among the cases (0.04, 0.47, and 0.08, respectively) and controls (0.05, 0.42, 0.07, respectively). We found that c.788C > T was monomorphic in this population. Interestingly, a four-locus haplotype (G-T-T-G) from these SNPs was found to be significantly associated with OTSC (p = 0.0077). We identified a de novo heterozygous mutation c.-832G > A in the promoter region of TGFB1 in 1 patient. In a secondary analysis, we investigated the possibility of abnormal TGFB1 expression and irregular bone growth in OTSC by expression analysis of TGFB1 mRNA in disease tissue compared to control. We found relatively increased expression of TGFB1 mRNA in the stapes tissues of cases compared to controls (p = 0.0057). In conclusion, this study identified a risk variant c.-509C > T and a risk haplotype G-T-T-G in the TGFB1 gene that contribute toward the susceptibility to OTSC.
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