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Mutation Analysis Identifies GUCY2D as the Major Gene Responsible for Autosomal Dominant Progressive Cone Degeneration

¹From the Molecular Genetics Laboratory and the ²Department of Ophthalmology, Institute for Ophthalmic Research, Centre for Ophthalmology, University Tübingen, Tübingen, Germany; the ³Department of Ophthalmology, Charité Campus Benjamin Franklin, Berlin, Germany; ⁴RetinaScience, Bonn, Germany; the ⁵Dipartimento di Neuroscienze, Cliniche Oftalmologia Università di Palermo, Italy; and the ⁶Retina Foundation of the Southwest, Dallas, Texas.

PURPOSE. Heterozygous mutations in the GUCY2D gene, which encodes the membrane-bound retinal guanylyl cyclase-1 protein (RetGC-1), have been shown to cause autosomal dominant inherited cone degeneration and cone–rod degeneration (adCD, adCRD). The present study was a comprehensive screening of the GUCY2D gene in 27 adCD and adCRD unrelated families of these rare disorders.

METHODS. Mutation analysis was performed by direct sequencing as well as PCR and subsequent restriction length polymorphism analysis (PCR/RFLP). Haplotype analysis was performed in selected patients by using microsatellite markers.

RESULTS. GUCY2D gene mutations were identified in 11 (40%) of 27 patients, and all mutations clustered to codon 838, including two known and one novel missense mutation: p.R838C, p.R838H, and p.R838G. Haplotype analysis showed that among the studied patients only two of the six analyzed p.R838C mutation carriers shared a common haplotype and that none of the p.R838H mutation carriers did.

CONCLUSIONS. GUCY2D is a major gene responsible for progressive autosomal dominant cone degeneration. All identified mutations localize to codon 838. Haplotype analysis indicates that in most cases these mutations arise independently. Thus, codon 838 is likely to be a mutation hotspot in the GUCY2D gene.

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