Analysis of Rotterdam Study cohorts confirms a previously identified RIPOR2 in-frame deletion as a prevalent genetic factor in phenotypically variable adult-onset hearing loss (DFNA21) in the Netherlands.
J Med Genet
; 60(11): 1061-1066, 2023 Nov.
Article
in En
| MEDLINE
| ID: mdl-37164627
ABSTRACT
BACKGROUND:
A 12-nucleotide RIPOR2 in-frame deletion was recently identified as a relatively common and highly penetrant cause of autosomal dominant non-syndromic sensorineural hearing loss, type DFNA21, in the Netherlands. The associated hearing phenotype is variable. The allele frequency (AF) of 0.039% of this variant was determined in a local cohort, and the reported phenotype may be biased because studied families were identified based on index patients with hearing loss (HL). In this study, we determine the AF in a cohort from a different geographical region of the Netherlands. Additionally, we examine the hearing phenotype in individuals with the variant but not selected for HL.METHODS:
The AF was determined in participants of the Rotterdam Study (RS), a large cohort study. The phenotype was characterised using individual clinical hearing data, including audiograms.RESULTS:
The observed AF in the RS cohort was 0.072% and not statistically significantly different from the previously observed 0.039%. The AF in the two cohorts combined was 0.052%. Consistent with previous findings, we found a highly variable audiometric phenotype with non-penetrance of HL in 40% of subjects aged 55-81, which is higher than the 10% at age 50 previously observed.CONCLUSION:
We found an overall higher AF and lower penetrance than previously reported, confirming that DFNA21 is relatively common in the Netherlands. This supports its potential suitability as a target for therapeutic development. Studying possible modifying factors is essential to explain the phenotypical variability and to identify patients eligible for such a therapy.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Type of study:
Observational_studies
/
Prognostic_studies
/
Risk_factors_studies
Language:
En
Journal:
J Med Genet
Year:
2023
Document type:
Article
Affiliation country:
Países Bajos