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Yuksel B, Dogan M, Boyacioglu O, Sahin M, Orenay-Boyacioglu S. Association Between Chronic Tinnitus and Brain-Derived Neurotrophic Factor Antisense RNA Polymorphisms Linked to the Val66Met Polymorphism in BDNF. Gene 2023; 875:147507. [PMID: 37230202 DOI: 10.1016/j.gene.2023.147507] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Revised: 04/24/2023] [Accepted: 05/22/2023] [Indexed: 05/27/2023]
Abstract
Tinnitus is the sound heard in the ear or head of a person in the absence of external stimuli. Its etiopathogenesis is still not fully understood and the etiological causes responsible for tinnitus are quite variable. Brain-derived neurotrophic factor (BDNF) is one of the key neurotrophic factors in the growth, differentiation, and survival of neurons and in the developing auditory pathway, including the inner ear sensory epithelium. The regulation of BDNF gene is known to be managed by BDNF antisense (BDNF-AS) gene. BDNF-AS is located downstream of the BDNF gene and transcribes a long non-coding RNA. Inhibition of BDNF-AS upregulates BDNF mRNA, which increases protein levels and stimulates neuronal development and differentiation. Thus, BDNF and BDNF-AS both may play roles in the auditory pathway. Polymorphisms in both genes may have impact on hearing performance. A link was suggested between tinnitus and BDNF Val66Met polymorphism. However, there is no study questioning the relationship of tinnitus with BDNF-AS polymorphisms linked with BDNF Val66Met polymorphism. Therefore, this study aimed to scrutinize the role of BDNF-AS polymorphisms showing linkage with the BDNF Val66Met polymorphism in the course of tinnitus pathophysiology. Six BDNF-AS polymorphisms were analyzed on the tinnitus patients (n=85) and the control subjects (n=60) by Fluidigm Real-Time PCR using the Fluidigm Biomark microfluidic platform. When BDNF-AS polymorphisms were compared between the groups in terms of genotype and gender distribution, statistically significant differences were detected in rs925946, rs1519480, and rs10767658, polymorphisms (p<0.05). When the polymorphisms were compared by the duration of tinnitus, significant differences were found in rs925946, rs1488830, rs1519480, and rs10767658 polymorphisms (p<0.05). According to genetic inheritance model analysis, 2.33 and 1.53-fold risks were found for the rs10767658 polymorphism in the recessive and the additive models, respectively. For the rs1519480 polymorphism, a 2.25 fold risk was observed in the additive model. For the rs925946 polymorphism, 2.44 fold protective effect in dominant model, and 0.62 fold risk was found in the additive model. In conclusion, four of the polymorphisms in BDNF-AS gene (rs955946, rs1488830, rs1519480, and rs10767658) are potential gene loci that may play a role in the auditory pathway and affect auditory performance.
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Affiliation(s)
- Buse Yuksel
- Department of Molecular Biotechnology, Institute of Health Sciences, Aydın Adnan Menderes University, Aydın 09010, Turkey
| | - Murat Dogan
- Department of Otolaryngology, Faculty of Medicine, Aydın Adnan Menderes University, Aydın 09010, Turkey; Department of Otolaryngology, Medicana International Istanbul-Beylikduzu, Istanbul 34520, Turkey
| | - Olcay Boyacioglu
- Faculty of Engineering, Aydın Adnan Menderes University, Aydın 09010, Turkey; Department of Cancer Biology, Faculty of Medicine, Wake Forest University, Winston Salem, NC, USA
| | - Mustafa Sahin
- Department of Otolaryngology, Faculty of Medicine, Aydın Adnan Menderes University, Aydın 09010, Turkey
| | - Seda Orenay-Boyacioglu
- Department of Medical Genetics, Faculty of Medicine, Aydın Adnan Menderes University, Aydın 09010, Turkey.
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Ranjbar N, Shahbazi A, Nourizadeh N, Namvar Arefi H, Kheirkhah MT. Relationship Between Serum Levels of Brain-Derived Neurotrophic Factor (BDNF) and Hearing Loss and Tinnitus. Indian J Otolaryngol Head Neck Surg 2023; 75:507-513. [PMID: 37206834 PMCID: PMC10188841 DOI: 10.1007/s12070-023-03600-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2022] [Accepted: 02/16/2023] [Indexed: 03/06/2023] Open
Abstract
Tinnitus and hearing loss are common problems that can be investigated via subjective and objective approaches. Previous studies have suggested a potential relationship between serum levels of Brain-Derived Neurotrophic Factor (BDNF) and tinnitus, reporting it as a potential objective biomarker for tinnitus. Therefore, the present study aimed to investigate the serum levels of BDNF in patients with tinnitus and/or hearing loss. Sixty patients were divided into 3 groups: Normal hearing with tinnitus (NH-T), hearing Loss with tinnitus (HL-T), and hearing loss without tinnitus (HL-NT). Moreover, 20 healthy participants were assigned to the control group or NH-NT. All participants were assessed using comprehensive audiological evaluations, serum BDNF level assessment, Tinnitus Handicap Inventory (THI), and Beck's Depression Inventory (BDI). There were significant intergroup differences in serum BDNF levels (p < 0.05), with the HL-T group showing the lowest BDNF levels. Moreover, the NH-T group had lower levels of BDNF compared to the HL-NT group. On the other hand, serum BDNF levels were significantly decreased in patients with an increased hearing threshold (p < 0.05). Also, serum BDNF levels had no significant relationship with tinnitus duration and loudness, as well as THI and BDI scores. The present study was the first to illustrate the importance of serum BDNF levels as a possible biomarker for predicting the severity of hearing loss and tinnitus in the affected patients. Also, it is possible that BDNF assessment can help find effective therapeutic methods for patients with hearing problems. Supplementary Information The online version contains supplementary material available at 10.1007/s12070-023-03600-z.
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Affiliation(s)
- Nastaran Ranjbar
- Department of Neuroscience, Faculty of Advanced Technologies in Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Ali Shahbazi
- Department of Neuroscience, Faculty of Advanced Technologies in Medicine, Iran University of Medical Sciences, Tehran, Iran
- Cellular and Molecular Research Center, Iran University of Medical Sciences, Tehran, Iran
| | - Navid Nourizadeh
- Otorhinolaryngology-Head and Neck Surgery Department , Imam Reza Educational Hospital, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Hossein Namvar Arefi
- Department of Audiology, School of Rehabilitation Sciences , Iran University of Medical Science, Tehran, Iran
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Effects of choline supplementation in mothers with hypothyroidism on the brain-derived neurotrophic factor gene expression changes in pre-pubertal offspring rats. Mol Biol Rep 2023; 50:2351-2356. [PMID: 36577834 DOI: 10.1007/s11033-022-08014-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Accepted: 10/06/2022] [Indexed: 12/30/2022]
Abstract
BACKGROUND Thyroid hormones play a vital function in the maturation in the course of mind development. Regarding the well-known effects of choline on brain-derived neurotrophic factor (BDNF), the study examined the effects of choline on hippocampal BDNF gene expression in maternal hypothyroidism rats. METHODS AND RESULTS To induce the hypothyroidism, 6-propyl-2-thiouracil was introduced to the ingesting water from the sixth day of gestation to twenty-first postnatal day (PND). Choline-treatment started twice a day on the first day of gestation until PND 21. On PND28, pups were sacrificed. The expression of BDNF gene was evaluated after the hippocampus was harvested. Our results demonstrated that both male and female pre-pubertal offspring rats' BDNF gene expression was decreased by developmental hypothyroidism. Choline increases the ratio of relative gene expression of BDNF in the hippocampus of males and females in the control/hypothyroidism group, especially in males. CONCLUSIONS It can be concluded that maternal choline supplementation on the first day of gestation until PND 21 improves brain development and cognitive function in pre-pubertal offspring rats regarding control/hypothyroidism groups.
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Basso L, Boecking B, Neff P, Brueggemann P, Peters EMJ, Mazurek B. Hair-cortisol and hair-BDNF as biomarkers of tinnitus loudness and distress in chronic tinnitus. Sci Rep 2022; 12:1934. [PMID: 35121746 PMCID: PMC8817043 DOI: 10.1038/s41598-022-04811-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2021] [Accepted: 12/21/2021] [Indexed: 12/23/2022] Open
Abstract
The role of stress and its neuroendocrine mediators in tinnitus is unclear. In this study, we measure cortisol as an indicator of hypothalamus–pituitary–adrenal (HPA) axis alterations and brain-derived neurotrophic factor (BDNF) as a marker of adaptive neuroplasticity in hair of chronic tinnitus patients to investigate relationships with tinnitus-related and psychological factors. Cross-sectional data from chronic tinnitus inpatients were analyzed. Data collection included hair sampling, pure tone audiometry, tinnitus pitch and loudness matching, and psychometric questionnaires. Elastic net regressions with n-fold cross-validation were performed for cortisol (N = 91) and BDNF (N = 87). For hair-cortisol (R2 = 0.10), the strongest effects were sampling in autumn and body-mass index (BMI) (positive), followed by tinnitus loudness (positive) and smoking (negative). For hair-BDNF (R2 = 0.28), the strongest effects were hearing aid use, shift work (positive), and tinnitus loudness (negative), followed by smoking, tinnitus-related distress (Tinnitus Questionnaire), number of experienced traumatic events (negative), and physical health-related quality of life (Short Form-12 Health Survey) (positive). These findings suggest that in chronic tinnitus patients, higher perceived tinnitus loudness is associated with higher hair-cortisol and lower hair-BDNF, and higher tinnitus-related distress with lower hair-BDNF. Regarding hair-BDNF, traumatic experiences appear to have additional stress-related effects, whereas hearing aid use and high physical health-related quality of life appear beneficial. Implications include the potential use of hair-cortisol and hair-BDNF as biomarkers of tinnitus loudness or distress and the need for intensive future research into chronic stress-related HPA axis and neuroplasticity alterations in chronic tinnitus.
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Affiliation(s)
- Laura Basso
- Tinnitus Center, Charité - Universitätsmedizin Berlin, Berlin, Germany
| | - Benjamin Boecking
- Tinnitus Center, Charité - Universitätsmedizin Berlin, Berlin, Germany
| | - Patrick Neff
- Department of Psychiatry and Psychotherapy, University of Regensburg, Regensburg, Germany.,University Research Priority Program 'Dynamics of Healthy Aging', University of Zurich, Zurich, Switzerland.,Department of Psychology, Centre for Cognitive Neuroscience, University of Salzburg, Salzburg, Austria
| | - Petra Brueggemann
- Tinnitus Center, Charité - Universitätsmedizin Berlin, Berlin, Germany
| | - Eva M J Peters
- Psychoneuroimmunology Laboratory, Department of Psychosomatic Medicine and Psychotherapy, Justus-Liebig University Giessen, Giessen, Germany.,Psychosomatics and Psychotherapy, Charité Center 12 Internal Medicine and Dermatology, Charité - Universitätsmedizin Berlin, Berlin, Germany
| | - Birgit Mazurek
- Tinnitus Center, Charité - Universitätsmedizin Berlin, Berlin, Germany.
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Symptom dimensions to address heterogeneity in tinnitus. Neurosci Biobehav Rev 2022; 134:104542. [PMID: 35051524 DOI: 10.1016/j.neubiorev.2022.104542] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Revised: 01/11/2022] [Accepted: 01/14/2022] [Indexed: 01/10/2023]
Abstract
Tinnitus, the auditory phantom percept, is a well-known heterogenous disorder with multiple subtypes. Researchers and clinicians have tried to classify these subtypes according to clinical profiles, aetiologies, and response to treatment with little success. The occurrence of overlapping tinnitus subtypes suggests that the disorder exists along a continuum of severity, with no clear distinct boundaries. In this perspective, we propose a neuro-mechanical framework, viewing tinnitus as a dimensional disorder which is a complex interplay of its behavioural, biological and neurophysiological phenotypes. Moreover, we explore the potential of these dimensions as interacting networks without a common existing cause, giving rise to tinnitus. Considering tinnitus as partially overlapping, dynamically changing, interacting networks, each representing a different aspect of the unified tinnitus percept, suggests that the interaction of these networks determines the phenomenology of the tinnitus, ultimately leading to a dimensional spectrum, rather than a categorical subtyping. A combination of a robust theoretical framework and strong empirical evidence can advance our understanding of the functional mechanisms underlying tinnitus and ultimately, improve treatment strategies.
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Li ZC, Fang BX, Yuan LX, Zheng K, Wu SX, Zhong N, Zeng XL. Analysis of Studies in Tinnitus-Related Gene Research. Noise Health 2021; 23:95-107. [PMID: 34975125 PMCID: PMC8772442 DOI: 10.4103/nah.nah_57_21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
Objective Summarize and analyze the current research results of tinnitus-related genes, explore the potential links between the results of each study, and provide reference for subsequent studies. Methods Collect and sort out the research literature related to tinnitus genes included in PubMed, Web of Science, China National Knowledge Infrastructure, and Wanfang Data Knowledge Service Platform before December 31, 2019. Then the relevant contents of the literature were sorted out and summarized. Results Fifty-one articles were finally selected for analysis: 31 articles (60.8%) were classified as researches on animal models of tinnitus, and 20 (39.2%) as researches on tinnitus patients. Existing studies have shown that genes related to oxidative stress, inflammatory response, nerve excitation/inhibition, and nerve growth are differentially expressed in tinnitus patients or animal models, and have presented the potential links between genes or proteins in the occurrence and development of tinnitus. Conclusion The research on tinnitus-related genes is still in the exploratory stage, and further high-quality research evidence is needed.
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Affiliation(s)
- Zhi-Cheng Li
- Department of Otolaryngology, Head and Neck Surgery, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Bi-Xing Fang
- Department of Otolaryngology, Head and Neck Surgery, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou; Department of Otolaryngology, Head and Neck Surgery, The First Affiliated Hospital of Sun Yat-sen University, China
| | - Lian-Xiong Yuan
- Department of Science and Research, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Ke Zheng
- Department of Otolaryngology, Head and Neck Surgery, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Shi-Xin Wu
- Department of Otolaryngology, Head and Neck Surgery, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Nanbert Zhong
- Department of Human Genetics, New York State Institute for Basic Research in Developmental Disabilities, New York, USA
| | - Xiang-Li Zeng
- Department of Otolaryngology, Head and Neck Surgery, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
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Nowaczewska M, Osiński S, Marzec M, Wiciński M, Bilicka K, Kaźmierczak W. The role of vitamin D in subjective tinnitus-A case-control study. PLoS One 2021; 16:e0255482. [PMID: 34407088 PMCID: PMC8372974 DOI: 10.1371/journal.pone.0255482] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Accepted: 07/18/2021] [Indexed: 11/29/2022] Open
Abstract
Regarding the high prevalence of vitamin D (25(OH)D) deficiency in the population and its possible association with ear diseases, we aimed to investigate the 25(OH)Dserum level in patients with subjective, nonpulsating tinnitus and its effect on tinnitus severity. The study included 201 tinnitus patients and 99 controls. Patient clinical information, including tinnitus characteristics and severity according to Tinnitus Handicap Inventory (THI), loudness assessed by Visual Analogue Scale (VAS), audiometry, and the blood level of vitamin D, was recorded. The level of 25(OH)D in tinnitus patients was significantly decreased compared with the controls (19.86 ± 7.53 and 27.43 ± 8.85 ng/ml, respectively; P value < 0.0001). More patients in the tinnitus group were deficient in vitamin D, compared with the controls (50.7% vs. 22.2% respectively, p < 0.0001). Tinnitus patients with a lower serum level of 25(OH)D (≤15 ng/dl) were significantly younger, had a higher degree of tinnitus severity measured with THI and VAS scales, had higher triglyceride and TSH levels, and a lower HDL level compared with individuals who had higher 25(OH)D level (>15 ng/dl). There was a strong correlation between the 25(OH)D level and THI. Our findings suggest that a large proportion of tinnitus patients suffers from vitamin D deficiency and that the vitamin D level correlates with tinnitus impact. We recommend a vitamin D assessment for all tinnitus patients.
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Affiliation(s)
- Magdalena Nowaczewska
- Department of Otolaryngology, Head and Neck Surgery, and Laryngological Oncology, Ludwik, Rydygier Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University, Bydgoszcz, Poland
- * E-mail:
| | - Stanisław Osiński
- Department of Otolaryngology, Head and Neck Surgery, and Laryngological Oncology, Ludwik, Rydygier Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University, Bydgoszcz, Poland
| | - Maria Marzec
- Department of Otolaryngology, Head and Neck Surgery, and Laryngological Oncology, Ludwik, Rydygier Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University, Bydgoszcz, Poland
| | - Michał Wiciński
- Department of Pharmacology and Therapeutics, Faculty of Medicine, Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University, Bydgoszcz, Poland
| | - Katarzyna Bilicka
- Department of Otolaryngology, Head and Neck Surgery, and Laryngological Oncology, Ludwik, Rydygier Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University, Bydgoszcz, Poland
| | - Wojciech Kaźmierczak
- Department of Sensory Organs Examination, Faculty of Health Sciences, Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University, Bydgoszcz, Poland
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Objective and Measurable Biomarkers in Chronic Subjective Tinnitus. Int J Mol Sci 2021; 22:ijms22126619. [PMID: 34205595 PMCID: PMC8235100 DOI: 10.3390/ijms22126619] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Revised: 06/16/2021] [Accepted: 06/17/2021] [Indexed: 12/18/2022] Open
Abstract
Tinnitus is associated with increased social costs and reduced quality of life through sleep disorders or psychological distress. The pathophysiology of chronic subjective tinnitus, which accounts for most tinnitus, has not been clearly elucidated. This is because chronic subjective tinnitus is difficult to evaluate objectively, and there are no objective markers that represent the diagnosis or therapeutic effect of tinnitus. Based on the results of studies on patients with chronic subjective tinnitus, objective and measurable biomarkers that help to identify the pathophysiology of tinnitus have been summarized. A total of 271 studies in PubMed, 303 in EMBASE, and 45 in Cochrane Library were found on biomarkers related to chronic subjective tinnitus published until April 2021. Duplicate articles, articles not written in English, review articles, case reports, and articles that did not match our topic were excluded. A total of 49 studies were included. Three specimens, including blood, saliva, and urine, and a total of 58 biomarkers were used as indicators for diagnosis, evaluation, prognosis, and therapeutic effectiveness of tinnitus. Biomarkers were classified into eight categories comprising metabolic, hemostatic, inflammatory, endocrine, immunological, neurologic, and oxidative parameters. Biomarkers can help in the diagnosis, measure the severity, predict prognosis, and treatment outcome of tinnitus.
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Haider HF, Hoare DJ, Ribeiro SF, Ribeiro D, Caria H, Trigueiros N, Borrego LM, Szczepek AJ, Papoila AL, Elarbed A, da Luz Martins M, Paço J, Sereda M. Evidence for biological markers of tinnitus: A systematic review. PROGRESS IN BRAIN RESEARCH 2021; 262:345-398. [PMID: 33931188 DOI: 10.1016/bs.pbr.2021.01.022] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Subjective tinnitus is a phantom sound heard only by the affected person and may be a symptom of various diseases. Tinnitus diagnosis and monitoring is based on subjective audiometric and psychometric methods. This review aimed to synthesize evidence for tinnitus presence or its severity. We searched several electronic databases, citation searches of the included primary studies through Web of Science, and further hand searches. At least two authors performed all systematic review steps. Sixty-two records were included and were categorized according the biological variable. Evidence for possible tinnitus biomarkers come from oxidative stress, interleukins, steroids and neurotransmitters categories. We found conflicting evidence for full blood count, vitamins, lipid profile, neurotrophic factors, or inorganic ions. There was no evidence for an association between tinnitus and the remaining categories. The current review evidences that larger studies, with stricter exclusion criteria and powerful harmonized methodological design are needed. Protocol published on PROSPERO (CRD42017070998).
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Affiliation(s)
- Haúla F Haider
- ENT Department, Hospital Cuf Tejo-Nova Medical School, Lisbon, Portugal; CUF Academic and Research Medical Center, Lisbon, Portugal; Comprehensive Health Research Centre (CHRC), Lisbon, Portugal.
| | - Derek J Hoare
- National Institute for Health Research (NIHR) Nottingham Biomedical Research Centre, Hearing Sciences, Division of Clinical Neuroscience, School of Medicine, University of Nottingham, Nottingham, United Kingdom
| | - Sara F Ribeiro
- ENT Department, Hospital Cuf Tejo-Nova Medical School, Lisbon, Portugal; CUF Academic and Research Medical Center, Lisbon, Portugal
| | - Diogo Ribeiro
- ENT Department, Hospital Cuf Tejo-Nova Medical School, Lisbon, Portugal; CUF Academic and Research Medical Center, Lisbon, Portugal
| | - Helena Caria
- Deafness Research Group, BTR Unit, BioISI, Faculty of Sciences, University of Lisbon (FCUL), Portugal; ESS/IPS-Biomedical Sciences Department, School of Health, Polytechnic Institute of Setubal, Portugal
| | - Nuno Trigueiros
- ENT Department, Hospital Pedro Hispano, Matosinhos, Portugal
| | - Luís Miguel Borrego
- Department of Immunology, Chronic Diseases Research Center (CEDOC), Faculty of Medical Sciences, NOVA Medical School, Lisbon, Portugal; Department of Immunoallergy, LUZ SAUDE, Hospital da Luz, Lisbon, Portugal
| | - Agnieszka J Szczepek
- Department of Otorhinolaryngology, Head and Neck Surgery, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin and Berlin Institute of Health, Berlin, Germany
| | - Ana Luísa Papoila
- Bioestatistics Department, Faculty of Medical Sciences, NOVA Medical School, Lisbon, Portugal
| | - Asma Elarbed
- National Institute for Health Research (NIHR) Nottingham Biomedical Research Centre, Hearing Sciences, Division of Clinical Neuroscience, School of Medicine, University of Nottingham, Nottingham, United Kingdom
| | - Maria da Luz Martins
- ENT Department, Hospital Cuf Tejo-Nova Medical School, Lisbon, Portugal; CUF Academic and Research Medical Center, Lisbon, Portugal
| | - João Paço
- ENT Department, Hospital Cuf Tejo-Nova Medical School, Lisbon, Portugal; CUF Academic and Research Medical Center, Lisbon, Portugal
| | - Magdalena Sereda
- National Institute for Health Research (NIHR) Nottingham Biomedical Research Centre, Hearing Sciences, Division of Clinical Neuroscience, School of Medicine, University of Nottingham, Nottingham, United Kingdom
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Wells HRR, Abidin FNZ, Freidin MB, Williams FMK, Dawson SJ. Genome-wide association study suggests that variation at the RCOR1 locus is associated with tinnitus in UK Biobank. Sci Rep 2021; 11:6470. [PMID: 33742053 PMCID: PMC7979698 DOI: 10.1038/s41598-021-85871-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Accepted: 03/02/2021] [Indexed: 01/04/2023] Open
Abstract
Tinnitus is a prevalent condition in which perception of sound occurs without an external stimulus. It is often associated with pre-existing hearing loss or noise-induced damage to the auditory system. In some individuals it occurs frequently or even continuously and leads to considerable distress and difficulty sleeping. There is little knowledge of the molecular mechanisms involved in tinnitus which has hindered the development of treatments. Evidence suggests that tinnitus has a heritable component although previous genetic studies have not established specific risk factors. From a total of 172,608 UK Biobank participants who answered questions on tinnitus we performed a case-control genome-wide association study for self-reported tinnitus. Final sample size used in association analysis was N = 91,424. Three variants in close proximity to the RCOR1 gene reached genome wide significance: rs4906228 (p = 1.7E-08), rs4900545 (p = 1.8E-08) and 14:103042287_CT_C (p = 3.50E-08). RCOR1 encodes REST Corepressor 1, a component of a co-repressor complex involved in repressing neuronal gene expression in non-neuronal cells. Eleven other independent genetic loci reached a suggestive significance threshold of p < 1E-06.
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Affiliation(s)
- Helena R R Wells
- Department of Twin Research and Genetic Epidemiology, School of Life Course Sciences, King's College London, London, SE1 7EH, UK
- UCL Ear Institute, University College London, London, WC1X 8EE, UK
| | - Fatin N Zainul Abidin
- UCL Ear Institute, University College London, London, WC1X 8EE, UK
- Centre for Medical Image Computing, Department of Medical Physics and Biomedical Engineering, University College London, London, WC1E 7JE, UK
| | - Maxim B Freidin
- Department of Twin Research and Genetic Epidemiology, School of Life Course Sciences, King's College London, London, SE1 7EH, UK
| | - Frances M K Williams
- Department of Twin Research and Genetic Epidemiology, School of Life Course Sciences, King's College London, London, SE1 7EH, UK.
| | - Sally J Dawson
- UCL Ear Institute, University College London, London, WC1X 8EE, UK.
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Jeong JE, Jeon S, Han JS, Cho EY, Hong KS, Park SN, Kim JJ. The Mediating Effect of Psychological Distress on the Association between BDNF, 5-HTTLPR, and Tinnitus Severity. Psychiatry Investig 2021; 18:187-195. [PMID: 33685039 PMCID: PMC8016684 DOI: 10.30773/pi.2020.0295] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/04/2020] [Accepted: 11/13/2020] [Indexed: 12/19/2022] Open
Abstract
OBJECTIVE To investigate the association between genetic polymorphisms of brain-derived neurotrophic factor (BDNF) or serotonin transporter gene-linked polymorphic region (5-HTTLPR) and tinnitus, and the mediating effects of psychological distress on this association. METHODS Eighty-six patients experiencing tinnitus and 252 controls were recruited. The Tinnitus Handicap Inventory was used to assess the severity of tinnitus and the Beck Depression Inventory-II (BDI-II), Beck Anxiety Inventory-II (BAI-II), and the Korean version of the Brief Encounter Psychosocial Instrument (BEPSI-K) were used to assess psychological distress. We compared the association of BDNF rs6265 (Val66Met) and 5-HTTLPR variants in the two groups. The mediating effects of BDI-II, BAI-II, and BEPSI-K were examined using multiple regression analysis and validated by the Sobel test and bootstrapping. RESULTS No significant differences were found between the groups regarding BDNF Val66Met and 5-HTTLPR, but the 5-HTTLPR variants trended toward association. Depressive symptoms appeared to act as a mediator on the relationship within the 5-HTTLPR s/s genotype and the severity of tinnitus. CONCLUSION Our findings provide a speculative idea on the association between the serotonergic system and tinnitus and suggest that depressive symptoms act as a mediator in tinnitus. Therefore, screening for depressive symptoms in patients with tinnitus is essential and intervention for depressive symptoms may help alleviate the severity of tinnitus.
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Affiliation(s)
- Jo-Eun Jeong
- Department of Psychiatry, Daejeon St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Sekye Jeon
- Department of Psychiatry, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Jae Sang Han
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Eun Young Cho
- Center of Clinical Research, Samsung Biomedical Research Institute, Seoul, Republic of Korea
| | - Kyung Sue Hong
- Department of Psychiatry, Sungkyunkwan University School of Medicine, Samsung Seoul Hospital, Seoul, Republic of Korea
| | - Shi Nae Park
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Jung Jin Kim
- Department of Psychiatry, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
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Urbina-Varela R, Soto-Espinoza MI, Vargas R, Quiñones L, Del Campo A. Influence of BDNF Genetic Polymorphisms in the Pathophysiology of Aging-related Diseases. Aging Dis 2020; 11:1513-1526. [PMID: 33269104 PMCID: PMC7673859 DOI: 10.14336/ad.2020.0310] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2020] [Accepted: 03/10/2020] [Indexed: 12/12/2022] Open
Abstract
For the first time in history, most of the population has a life expectancy equal or greater than 60 years. By the year 2050, it is expected that the world population in that age range will reach 2000 million, an increase of 900 million with respect to 2015, which poses new challenges for health systems. In this way, it is relevant to analyze the most common diseases associated with the aging process, namely Alzheimer´s disease, Parkinson Disease and Type II Diabetes, some of which may have a common genetic component that can be detected before manifesting, in order to delay their progress. Genetic inheritance and epigenetics are factors that could be linked in the development of these pathologies. Some researchers indicate that the BDNF gene is a common factor of these diseases, and apparently some of its polymorphisms favor the progression of them. In this regard, alterations in the level of BDNF expression and secretion, due to polymorphisms, could be linked to the development and/or progression of neurodegenerative and metabolic disorders. In this review we will deepen on the different polymorphisms in the BDNF gene and their possible association with age-related pathologies, to open the possibilities of potential therapeutic targets.
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Affiliation(s)
- Rodrigo Urbina-Varela
- 1Laboratorio de Fisiología y Bioenergética Celular, Departamento de Farmacia, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Santiago, Chile
| | | | - Romina Vargas
- 1Laboratorio de Fisiología y Bioenergética Celular, Departamento de Farmacia, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Luis Quiñones
- 3Laboratorio de Carcinogenesis Química y Farmacogenética (CQF), Departamento de Oncología Básico-Clínica, Facultad de Medicina, Universidad de Chile
| | - Andrea Del Campo
- 1Laboratorio de Fisiología y Bioenergética Celular, Departamento de Farmacia, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Santiago, Chile
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Single nucleotide polymorphisms in tinnitus patients exhibiting severe distress. Sci Rep 2020; 10:13023. [PMID: 32747715 PMCID: PMC7398919 DOI: 10.1038/s41598-020-69467-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Accepted: 07/01/2020] [Indexed: 11/08/2022] Open
Abstract
The association between distress caused by tinnitus and psychological factors such as depression and anxiety has been examined and reported. However, prognostic factors remain poorly understood because there are only a few reports on genetic associations. We theorized there might be an association between the grade of tinnitus distress and the genetic background related to psychological factors which might lead us to identify prognostic markers. We enrolled 138 patients who had suffered from tinnitus for over 3 months. Using Tinnitus Handicap Inventory (THI) scores, we examined the association between tinnitus distress and a genetic background related to depression or anxiety. A significant association between single nucleotide polymorphism rs131702 of the Breakpoint Cluster Region (BCR) gene and the severe THI score was identified. In addition, there was an association with the severity of the State-Trait Anxiety Inventory, an index of state anxiety severity. No association was found with the Self-Rating Depression Scale, an index of depression severity. It is reported that rs131702 of BCR in Japanese patients are related to bipolar II depression characterized by fluctuation between abnormal mood states of mania and depression. Our results indicate that rs131702 of BCR is independent of depression in this study and is, therefore, a prognostic factor unique to tinnitus. We conclude that the severity of tinnitus is associated with genes related to depression.
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Orenay-Boyacioglu S, Caliskan M, Boyacioglu O, Coskunoglu A, Bozkurt G, Cam FS. Chronic tinnitus and BDNF/GDNF CpG promoter methylations: a case-control study. Mol Biol Rep 2019; 46:3929-3936. [PMID: 31041673 DOI: 10.1007/s11033-019-04837-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2019] [Accepted: 04/25/2019] [Indexed: 01/12/2023]
Abstract
Brain-derived neurotrophic factor (BDNF) and Glial-derived neurotrophic factor (GDNF) are neurotrophic factors that play key roles in the auditory pathway. While the relationship between serum levels and polymorphisms of BDNF/GDNF and chronic tinnitus is emphasized in the literature, there is no study showing the link between the promoter methylations of these genes and tinnitus. For this purpose, the relationship between chronic tinnitus and peripheral blood derived BDNF/GDNF promoter methylations was investigated to identify their role in the pathophysiology of tinnitus. In this case-control study, we examined the possible effects of BDNF/GDNF methylations in the blood samples of patients with tinnitus complaints for more than 3 months. Sixty tinnitus subjects between the ages of 18-55 and 50 healthy control subjects in the same age group who were free of any otorhinolaryngology and systemic disease were selected for examination. Methylation of total 12 CpG sites in BDNF and GDNF promoter regions were determined by the bisulfite-pyrosequencing method. Statistically significant differences were detected between BDNF CpG6 and GDNF CpG3-5-6 methylation ratios in the comparison of control group and the chronic tinnitus patients (P = 0.002, 0.0005, 0.00003, and 0.0029, respectively). To our knowledge, this is the first study in the literature investigating the relationship between chronic tinnitus and peripheral blood derived BDNF/GDNF promoter methylations. It is believed that the current results might be supported by investigating the relationships between BDNF/GDNF methylations and genotypes in future research using higher sample sizes.
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Affiliation(s)
- Seda Orenay-Boyacioglu
- Department of Medical Genetics, Faculty of Medicine, Aydin Adnan Menderes University, Aydin, Turkey.
| | - Metin Caliskan
- Department of Medical Genetics, Faculty of Medicine, Aydin Adnan Menderes University, Aydin, Turkey
| | - Olcay Boyacioglu
- Faculty of Engineering, Aydin Adnan Menderes University, Aydin, Turkey
| | - Aysun Coskunoglu
- Department of Medical Genetics, State Hospital of Sivas, Sivas, Turkey
| | - Gokay Bozkurt
- Department of Medical Genetics, Faculty of Medicine, Aydin Adnan Menderes University, Aydin, Turkey
| | - F Sirri Cam
- Department of Medical Genetics, Faculty of Medicine, Manisa Celal Bayar University, Manisa, Turkey
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