C2orf71 mutations as a frequent cause of autosomal-recessive retinitis pigmentosa: Clinical analysis and presentation of 8 novel mutations

Christina Gerth-Kahlert, Amit Tiwari, James V.M. Hanson, Vaishnavi Batmanabane, Elias Traboulsi, Mark E. Pennesi, Abdullah A. Al-Qahtani, Byron L. Lam, John Heckenlively, Sandrine A. Zweifel, Ajoy Vincent, Fabienne Fierz, Daniel Barthelmes, Kari Branham, Naheed Khan, Angela Bahr, Luzy Baehr, István Magyar, Samuel Koller, Silvia Azzarello-BurriDunja Niedrist, Elise Heon, Wolfgang Berger

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

Purpose. To define the phenotype of C2orf71 associated retinopathy and to present novel mutations in this gene. METHODS. A retrospective multicenter study of patients with retinopathy and identified C2orf71 mutations was performed. Ocular function (visual acuity, visual fields, electroretinogram [ERG] responses); retinal morphology (fundus, optical coherence tomography); and underlying mutations were analyzed. RESULTS. Thirteen patients from 11 families, who were aged 7 to 63 years (mean: 32.1 years) at their first examination with presumed compound heterozygous (6/13 patients) or homozygous (7/13 patients) C2orf71 mutations were identified. Eight of the mutations were novel. Truncation mutations were responsible in all cases. Nyctalopia was observed in less than 50% of patients. Visual acuity ranged from 20/20 to light perception. Severe visual loss was associated with atrophic maculopathy. Full-field ERG responses showed severe progressive cone-rod or rod-cone dysfunction. Typical fundus changes were progressive symmetrical retinopathy with an early mild maculopathy and patchy circular midperipheral RPE atrophy. Normal retinal lamination was preserved despite early disruption of the ellipsoid zone and RPE irregularities. Outer retinal tubulations were associated with better-preserved visual acuity. CONCLUSIONS. On the basis of our multicenter analysis, C2orf71 might represent a more frequently mutated gene in autosomal recessive retinitis pigmentosa in some populations. The phenotype analysis over a wide age range showed a variable and progressive retinal degeneration with early onset maculopathy and a better visual potential before the age of 30 years.

Original languageEnglish (US)
Pages (from-to)3840-3850
Number of pages11
JournalInvestigative Ophthalmology and Visual Science
Volume58
Issue number10
DOIs
StatePublished - 2017

Keywords

  • C2orf71 gene
  • Outer retinal tabulation
  • Phenotype
  • Retinitis pigmentosa

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems
  • Cellular and Molecular Neuroscience

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    Gerth-Kahlert, C., Tiwari, A., Hanson, J. V. M., Batmanabane, V., Traboulsi, E., Pennesi, M. E., Al-Qahtani, A. A., Lam, B. L., Heckenlively, J., Zweifel, S. A., Vincent, A., Fierz, F., Barthelmes, D., Branham, K., Khan, N., Bahr, A., Baehr, L., Magyar, I., Koller, S., ... Berger, W. (2017). C2orf71 mutations as a frequent cause of autosomal-recessive retinitis pigmentosa: Clinical analysis and presentation of 8 novel mutations. Investigative Ophthalmology and Visual Science, 58(10), 3840-3850. https://doi.org/10.1167/iovs.17-21597