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Updated: Jul 27, 2025
In Vivo Morphometric Analysis of Human Cranial Nerves Using Magnetic Resonance Imaging in Menière's Disease Ears and Normal Hearing Ears
Published on: February 21, 2018
Recent advances in understanding molecular bases of Ménière's disease
Lidia Frejo1,2,3,4, Jose A Lopez-Escamez1,2,3,4
1Otology & Neurotology Group CTS495, Department of Genomic Medicine, GENYO-Centre for Genomics and Oncological Research-Pfizer/University of Granada/ Junta de Andalucía, PTS, Granada, Spain.
Abstract:
Ménière's disease (MD) is a rare syndromic disorder of the inner ear defined by sensorineural hearing loss (SNHL) associated with episodes of vertigo and tinnitus. The phenotype is variable, and it may be associated with other comorbidities, such as migraine, asthma, and several autoimmune disorders. The condition has a significant heritability according to epidemiological and genetic data, with a difference in comorbidities according to ethnicity. Familial MD is found in 10%, the most commonly found genes being OTOG, MYO7A and TECTA, previously associated with autosomal dominant and recessive SNHL. These findings suggest that proteins involved in the tectorial membrane and stereocilia links are critical in the pathophysiology of MD. Moreover, proinflammatory cytokines may have a role in some patients with MD by promoting a persistent inflammatory status. Preliminary data suggest that sodium intake could be related to the release of cytokines, and this may influence the relapsing course of the condition. The ionic homeostasis of the otolithic and tectorial membranes could be critical in suppressing the innate motility of individual hair cell bundles, and focal detachment of the otolithic, or tectorial membranes may cause random depolarization of hair cells and explain changes in tinnitus loudness or the triggering of vertigo attacks.
Insights
Ménière's disease, a rare inner ear disorder, involves hearing loss, vertigo, and tinnitus. Genetic factors and inflammation, potentially influenced by sodium intake, play key roles in its complex pathophysiology.
Area of Science:
- Otolaryngology
- Genetics
- Immunology
Background:
- Ménière's disease (MD) is a rare inner ear disorder characterized by sensorineural hearing loss (SNHL), vertigo, and tinnitus.
- MD exhibits variable phenotypes and is linked to comorbidities like migraine and autoimmune disorders, with significant heritability.
- Genetic factors, including genes like OTOG, MYO7A, and TECTA, are implicated, suggesting roles for proteins in the tectorial and otolithic membranes.
Purpose of the Study:
- To explore the genetic underpinnings and potential pathophysiological mechanisms of Ménière's disease.
- To investigate the role of inflammation and environmental factors, such as sodium intake, in MD.
- To understand the relationship between genetic predispositions, membrane homeostasis, and symptom manifestation in MD.
Main Methods:
- Review of epidemiological and genetic data on familial Ménière's disease.
- Analysis of genes associated with SNHL and their potential link to MD pathophysiology.
- Exploration of the role of proinflammatory cytokines and sodium intake in MD.
Main Results:
- Familial MD occurs in 10% of cases, with OTOG, MYO7A, and TECTA being commonly identified genes.
- Proteins involved in tectorial membrane and stereocilia function are critical in MD pathophysiology.
- Proinflammatory cytokines and sodium intake may influence the relapsing nature of MD, with ionic homeostasis disruption potentially triggering symptoms.
Conclusions:
- Genetic factors and proteins in the inner ear's structural components are central to MD.
- Inflammation and dietary factors like sodium intake may contribute to MD's progression and symptom variability.
- Maintaining ionic homeostasis in the otolithic and tectorial membranes is crucial for preventing hair cell dysfunction and MD attacks.
