Gene study links Ménière’s disease risk to early inner ear development

A large genetic analysis has found evidence that Ménière’s disease may be tied partly to how the inner ear forms early in life, according to researchers at the Perelman School of Medicine at the University of Pennsylvania. The finding matters because the chronic disorder has often been studied through the lens of adult fluid imbalance in the inner ear, while its deeper causes have remained unclear.

The study, published in the American Journal of Human Genetics, analyzed data from five major biobanks and identified five areas of the genome associated with Ménière’s disease risk. Penn researchers said the work offers the first large-scale genetic framework for studying the condition.

Ménière’s disease affects about 1 in 2,000 people, according to the Penn team. It can cause recurring vertigo, changing levels of hearing loss, tinnitus and a sensation of pressure or fullness in the ear.

Doctors have long linked the disease to abnormal fluid buildup in the inner ear, according to the researchers. The new analysis suggests that small inherited differences affecting inner ear development may leave some people more susceptible to symptoms later, especially when combined with factors such as aging, inflammation, vascular changes or environmental exposures.

Douglas Epstein, a professor and vice chair of genetics at Penn and a senior co-author of the study, said the results point to early structural differences in the inner ear that may fall within the normal range but could increase vulnerability decades later. The researchers described those differences as part of the ear’s developmental “blueprint.”

Five biobanks, five genetic regions

The research drew on data from All of Us, the Million Veteran Program, UK Biobank, FinnGen and Biobank Japan. Together, the data included 8,969 people with Ménière’s disease and nearly 2 million controls, according to Penn.

Using that combined data set, the team found five genomic regions tied to risk. The researchers said the regions point toward biological systems involved in early inner ear formation and later maintenance of fluid balance.

The study also highlighted retinoic acid, a molecule derived from vitamin A. Penn researchers said signals near genes that regulate retinoic acid levels suggest the pathway may help control pressure and fluid dynamics inside the inner ear.

Bogdan Pasaniuc, a Penn genetics professor and senior co-author, said the findings give scientists clearer biological targets after years in which Ménière’s disease was difficult to study because key pathways were uncertain.

Genetics is only part of risk

The Penn team said the disease also shares genetic links with hearing loss, tinnitus, vertigo, migraine and sleep apnea. The researchers said those overlaps suggest some related disorders may involve common biological roots.

The findings do not make Ménière’s disease predictable through a genetic test. The researchers estimated that genetics accounts for about 7% of overall risk, meaning other biological and environmental factors likely play a larger role.

Iain Mathieson, an associate professor of genetics at Penn and a senior co-author, said the study maps where researchers should look next. Penn said future work will use human inner ear models and animal systems to test how the identified genetic differences affect ear structure, function and fluid regulation.

The researchers also said larger and more diverse genetic studies will be needed to sharpen the results and assess whether the findings can eventually support better treatments.

This story draws on original reporting from Medical Xpress.