Novel mutations in c2orf71 causing an early onset form of cone-rod dystrophy: A molecular diagnosis after 20 years of clinical follow-up.
Authors of this article are:
Serra R, Floris M, Pinna A, Boscia F, Cucca F, Angius A.
A summary of the article is shown below:
Purpose: Cone rod-dystrophies (CRDs) are pigmentary retinopathies mainly involving cones. CRDs typically present with decreased visual acuity and loss of sensitivity in the central visual field, reflecting the primary dysfunction of cones associated with night blindness and concentric visual field loss due to rod dysfunction. We describe the phenotype, natural history, and molecular analysis results of an early onset form of CRD.Methods: An otherwise healthy 25-year-old man from Sardinia, Italy, initially presented with subacute visual loss and central scotoma in both eyes. He underwent a complete ophthalmic examination, electrophysiologic testing, and genetic counseling. We first applied a candidate gene approach on ABCA4 to detect mutations; then, we performed exome sequencing (WES) on all family members to identify causative mutations.Results: The ophthalmic examination was unremarkable except the fundus examination, which revealed a well-circumscribed ring-shaped area of choroidal and RPE atrophy surrounding the fovea in the left eye and small white patches of atrophy around the fovea in the right eye. The ocular features and medical history were consistent with a diagnosis of CRD. Twenty years later, he showed a marked impairment in visual function, secondary to severe atrophic maculopathy associated with sparse pigmentary deposits. Molecular analysis identified two novel frameshift mutations in C2orf71: c.3039dupC: p.Ser1014Leufs*93 and c.1804_1805delAG:p. His603Argfs*77.Conclusions: The mutations in C2orf71 reported in this study comprise protein truncation mutations, which are likely to be involved in the pathogenesis of this severe form of early onset CRD.Copyright © 2019 Molecular Vision.
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