Cited by 20Genomics and Rare DiseasesHearing, Cochlea, Tinnitus, GeneticsProtein Structure and Dynamics

Assessing variants of uncertain significance implicated in hearing loss using a comprehensive deafness proteome

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Tollefson, Mallory R., Gogal, Rose A., Weaver, A. Monique, Schaefer, Amanda M., Marini, Robert J., Azaiez, Hela, Kolbe, Diana L., Wang, Donghong +5 more·2023·Human Genetics

Published version of a preprint

Abstract

Hearing loss is the leading sensory deficit, affecting ~ 5% of the population. It exhibits remarkable heterogeneity across 223 genes with 6328 pathogenic missense variants, making deafness-specific expertise a prerequisite for ascribing phenotypic consequences to genetic variants. Deafness-implicated variants are curated in the Deafness Variation Database (DVD) after classification by a genetic hearing loss expert panel and thorough informatics pipeline. However, seventy percent of the 128,167 missense variants in the DVD are “variants of uncertain significance” (VUS) due to insufficient evidence for classification. Here, we use the deep learning protein prediction algorithm, AlphaFold2, to curate structures for all DVD genes. We refine these structures with global optimization and the AMOEBA force field and use DDGun3D to predict folding free energy differences (∆∆G Fold ) for all DVD missense variants. We find that 5772 VUSs have a large, destabilizing ∆∆G Fold that is consistent with pathogenic variants. When also filtered for CADD scores (> 25.7), we determine 3456 VUSs are likely pathogenic at a probability of 99.0%. Of the 224 genes in the DVD, 166 genes (74%) exhibit one or more missense variants predicted to cause a pathogenic change in protein folding stability. The VUSs prioritized here affect 119 patients (~ 3% of cases) sequenced by the OtoSCOPE targeted panel. Approximately half of these patients previously received an inconclusive report, and reclassification of these VUSs as pathogenic provides a new genetic diagnosis for six patients.

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Authors
Tollefson, M. R., Gogal, R. A., Weaver, A. M., Schaefer, A. M., Marini, R. J., Azaiez, H., Kolbe, D. L., Wang, D., Weaver, A. E., Casavant, T. L., Braun, T. A., Smith, R. J. H., & Schnieders, M. J.
Affiliations
  • University of Iowa (US)
  • University of Iowa Hospitals and Clinics (US)
Corresponding author
  • Smith, Richard J. H.
  • Schnieders, Michael J.
Venue
Human Genetics
Published
2023-04-22
Volume
142
Issue
6
Pages
819-834
ISSN
  • 0018-7348 (ISSN-L)
  • 0340-6717
  • 1432-1203
OpenAlex
W4366742193
Cited by
20
References
58
Citations by year
2026: 3 · 2025: 7 · 2024: 10
FWCI
3.32
Type
journal article
Language
en
Open access
Locations
  • Human Genetics (publishedVersion, cc-by)
  • Research Square (acceptedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • PubMed Central (submittedVersion, cc-by)
Funders
  • Division of Chemistry (1751688)
  • National Science Foundation (000390183)
  • National Institute of General Medical Sciences (T32GM008365)
  • National Institute on Deafness and Other Communication Disorders (R01DC012049, R01DC002842, R01DC017955)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genomics and Rare Diseases
  • Life Sciences › Neuroscience › Sensory Systems › Hearing, Cochlea, Tinnitus, Genetics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Structure and Dynamics
Keywords
variants of uncertain significance, hereditary hearing loss, missense mutations, protein folding stability, folding free energy, AlphaFold2, AMOEBA force field, CADD score, variant reclassification, genetic diagnosis

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