Atypical mild enhanced S-cone syndrome with novel compound heterozygosity of the NR2E3 gene.

Abstract

PURPOSE To report mild enhanced s-cone syndrome (ESCS) associated with a novel heterozygous mutation of the NR2E3 gene. DESIGN Observational case report. METHODS Clinical examination, optical coherence tomography (OCT), electroretinography (ERG), genetic analysis, and protein homology modeling. RESULTS Examination of a 9-year-old girl with acute visual loss of the left eye showed visual acuity of 20/30 in the right eye and 20/200 in the left eye; OCT revealed a choroidal neovascular membrane (CNVM) in the left fovea and cystic maculopathy in the right eye. Full-field ERG showed supranormal s-cone responses, reduced rod response, and characteristic ESCS waveform in photopic cone response but not in scotopic bright-flash response. Sequence analysis revealed heterozygous mutations in the NR2E3 gene, c.767C-->T yielding a substitution p.Ala256Val, and a mutation in the splice site before exon 2, c.119-2 A-->C. CONCLUSIONS The p.Ala256Val mutation affects the ligand binding domain of the NR2E3 nuclear receptor only, resulting in modestly impaired ESCS ERG results.

Cite this paper

@article{Lam2007AtypicalME, title={Atypical mild enhanced S-cone syndrome with novel compound heterozygosity of the NR2E3 gene.}, author={Byron L. Lam and Jeffrey L. Goldberg and Kristen L Hartley and Edwin M. Stone and Mu - Tai Liu}, journal={American journal of ophthalmology}, year={2007}, volume={144 1}, pages={157-9} }