Phenotypic expansion and progression of SPATA7-associated retinitis pigmentosa

Doc Ophthalmol. 2018 Apr;136(2):125-133. doi: 10.1007/s10633-018-9626-1. Epub 2018 Feb 6.

Abstract

Purpose: To report an unusual phenotype of retinitis pigmentosa (RP) caused by compound heterozygous mutations in SPATA7, and describe the progression over a two year follow-up period.

Methods: Retrospective case study.

Results: A 63-year-old man with a long history of nyctalopia, progressive visual field constriction, and a recent subacute decrease in visual acuity of the left eye presented for evaluation of a suspected retinal degeneration. Multimodal retinal imaging and functional assessment with full-field electroretinogram suggested a severe rod-cone dysfunction masquerading as a choroideremia-like phenotype. A vitreous opacity was found to explain recent changes in the left eye and a 25-guage vitrectomy and membrane peel was performed, yielding no change in visual acuity. Whole-exome sequencing revealed compound heterozygous variants in SPATA7 that were predicted to be pathogenic.

Conclusions: Compound heterozygous c.1100A > G, p.(Y367C) and c.1102_1103delCT, p.(L368Efs*4) variants in SPATA7 manifest as an unusual RP phenotype in this case, showing extensive choroidal sclerosis and retinal pigment epithelium (RPE) atrophy with evidence of progression over two years on multimodal imaging.

Keywords: Choroidal sclerosis; Retinitis pigmentosa; SPATA7.

Publication types

  • Case Reports
  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Atrophy
  • Choroid / pathology
  • DNA-Binding Proteins / genetics*
  • Disease Progression
  • Electroretinography
  • Fluorescein Angiography
  • Humans
  • Male
  • Middle Aged
  • Mutation*
  • Phenotype
  • Retina / physiopathology
  • Retinal Pigment Epithelium / pathology
  • Retinitis Pigmentosa / diagnosis*
  • Retinitis Pigmentosa / genetics*
  • Retinitis Pigmentosa / physiopathology
  • Retrospective Studies
  • Sclerosis / pathology
  • Tomography, Optical Coherence
  • Visual Acuity / physiology
  • Visual Fields / physiology

Substances

  • DNA-Binding Proteins
  • SPATA7 protein, human