Novel Mutations in the KCNV2 Gene in Patients with Cone Dystrophy and a Supernormal Rod Electroretinogram

Abstract

Purpose: To identify mutations in KCNV2 in patients with a form of cone dystrophy characterized by a supernormal rod electroretinogram (ERG). Methods: The 2 exons and flanking intron DNA of KCNV2 from 8 unrelated patients were PCR amplified and sequenced. Results: We found 1 frameshift, 2 nonsense, 1 non-stop, and 6 missense mutations. Every patient had one or two mutations identified. Of the missense mutations, 4 affected residues were in the amino terminal region of the protein, and two in the pore region. Conclusions: KCNV2 mutations account for most if not all cases of cone dystrophy with a supernormal rod ERG.

Keywords:

• Gene mutation
• retinal degeneration
• electroretinogram

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Erratum