ClinVar

Description

The c.5804T>C variant in MYO7A is a missense variant predicted to cause substitution of leucine by proline at amino acid 1935 (p.Leu1935Pro). The highest population minor allele frequency in gnomAD v4.1 is 0.00002204 (26/1179460 alleles) in the European (non-Finnish) population, which is lower than the ClinGen Hearing Loss VCEP threshold (≤0.00007) for PM2_Supporting, meeting this criterion (PM2_Supporting). The computational predictor REVEL gives a score of 0.961, which is above the threshold of 0.7, evidence that correlates with impact to MYO7A function (PP3). This variant has been detected in 2 individuals with autosomal recessive Usher syndrome. Both were compound heterozygous for the variant and a pathogenic or likely pathogenic variant and both of those were confirmed in trans by family testing (2 PM3 points, SCV001239772.1, SCV000059855.6, Blueprint Genetics, Laboratory for Molecular Medicine) (PM3_Strong). At least one patient with this variant displayed sensorineural hearing loss with retinitis pigmentosa, which is highly specific for autosomal recessive Usher syndrome (PP4, SCV000059855.6, Laboratory for Molecular Medicine). In summary, this variant meets the criteria to be classified as likely pathogenic for autosomal recessive Usher syndrome based on the ACMG/AMP criteria applied, as specified by the ClinGen Hearing Loss VCEP: PM3_Strong, PM2_Supporting, PP3, PP4. (ClinGen Hearing Loss VCEP specifications version 2; 9/24/2024)