Protein misfolding identified as a prevalent mechanism behind hereditary deafness variants

Published in *PLOS Genetics*, a study by Gogal, Cox, Kolbe, Odell, Ovel, McCormick, Hong, Azaiez, Casavant, Smith, Braun, and Schnieders addresses a major bottleneck in the genetics of hereditary hearing loss: the classification of variants of uncertain significance (VUS).

The team drew on the Deafness Variation Database (DVD), a public resource containing 381,924 missense variants across 224 hearing-loss-associated genes, of which 303,577 remain classified as VUS. Rather than evaluating variants individually — an approach that cannot scale — the researchers applied computational modelling of protein structure and thermodynamic stability to assess protein misfolding as a mechanism of pathogenicity across this entire variant landscape.

Their analysis identifies protein misfolding as a prevalent mechanism underlying hereditary deafness, suggesting that a large proportion of currently unclassified variants in deafness genes may act by destabilising the encoded protein rather than through other molecular mechanisms. The framework offers a route to systematic, mechanism-informed reclassification of VUS at scale, which has direct implications for diagnostic yield in clinical genomics programmes serving individuals and families with hearing loss.

Genetic counsellors and researchers involved in deafness genetics will note the potential of this approach to reduce the burden of uncertainty in variant reporting, while acknowledging that computational predictions require orthogonal functional validation before clinical application.