Codons 837 and 838 in the Retinal Guanylate Cyclase Gene on Chromosome 17p: Hot Spots for Mutations in Autosomal Dominant Cone-Rod Dystrophy?

Cone-rod dystrophies (CRDs) represent a clinically and genetically heterogeneous group of chorioretinal dystrophies characterized by gradual loss of visual acuity, central visual field defects, and photophobia. We investigated a Swiss family with autosomal dominant CRD (adCRD). Members of 3 generations showed reduced visual acuity and abnormalities on electroretinograms compatible with CRD. Blood was taken from 5 affected and 4 unaffected family members, as well as from 2 children at risk (Figure 1).