ClinVar

Description

The Arg4192His variant in USH2A has been reported in four individuals with autosomal recessive retinitis pigmentosa (McGee 2010, Avila-Fernandez 2010, Tucker 2013). Three of these individuals were homozygous or compound heterozygous, and one was only reported to be heterozygous for this variant but there was no information about a second variant. The Arg4192His variant has been identified in 0.023% (2/8600) of European American chromosomes by the NHLBI Exome Sequencing Project (http://evs.gs.washington.edu/EVS/; dbSNP rs199605265). Although this variant has been seen in the general population, its frequency is not high enough to rule out a pathogenic role. The arginine (Arg) at position 4192 is not conserved in mammals or evolutionary distant species, including many species carrying a histidine (His) at this position, raising the possibility that a change at this position may be tolerated. Additional computational prediction tools suggest that the Arg4192His variant may not impact the protein, though this information is not predictive enough to rule out pathogenicity. In summary, while the clinical significance of the Arg4192His variant is uncertain, these data suggest that is more likely to be benign.