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Japanese Journal of Ophthalmology

, Volume 61, Issue 5, pp 395–401 | Cite as

Heterozygous deletion of the OPA1 gene in patients with dominant optic atrophy

  • Takaaki HayashiEmail author
  • Hiroyuki Sasano
  • Satoshi Katagiri
  • Kazushige Tsunoda
  • Shuhei Kameya
  • Mitsuru Nakazawa
  • Takeshi Iwata
  • Hiroshi Tsuneoka
Clinical Investigation

Abstract

Purpose

Several OPA1 variants cause dominant optic atrophy (DOA), the most common hereditary optic atrophy. Here, we describe a newly discovered OPA1 deletion in 3 patients with DOA.

Methods

A female proband, her brother, and her mother underwent complete ophthalmologic examinations that included optical coherence tomography and visual field assessments using a Humphrey Field Analyzer with both standard automated perimetry (SAP) and short-wavelength automated perimetry (SWAP). Genomic DNA from each patient was examined to detect genomic rearrangements involving OPA1; the genetic analysis involved both multiplex ligation probe amplification and conventional Sanger sequencing.

Results

Each patient had temporal optic disc pallor and significant thinning of the retinal nerve fiber layer in both eyes, although there was phenotypic variability among the patients that ranged from asymptomatic to moderately decreased visual acuity. For the affected brother and mother, the mean deviation values from SAP were within the normal range, whereas those from SWAP were significantly below the normal range (P < .05). The genetic analysis identified a newly discovered heterozygous deletion that encompasses exons 9–14 and revealed a breakpoint junction that directly connects intron 8 to intron 14.

Conclusions

This newly described deletion is likely to lead to loss of function in the functionally important GTPase domain encoded by exons 9–16, and the heterozygosity suggested that haploinsufficiency caused the phenotypes. The deletion may be associated with mild DOA phenotypes ranging from asymptomatic to moderately decreased visual acuity.

Keywords

Hereditary optic neuropathy OPA1 Genetics Mutation 

Notes

Acknowledgements

This study was supported in part by JSPS Kakenhi Grants [Nos. 26462674 (KT) and 25462738 (TH)] and by the Japan Agency for Medical Research and Development, Practical Research Project for Rare/Intractable Diseases [No. 15ek0109072h0002 (TI)].

Conflicts of interest

T. Hayashi, None; H. Sasano, None; S. Katagiri, None; K. Tsunoda, None; S. Kameya, None; M. Nakazawa, None; T. Iwata, None; H. Tsuneoka, Grants (Abbott Medical Optics, Alcon, Daiichi Sankyo, Kowa, MSD, NIDEK, Otsuka, Santen, Senju), Lecture fees (Abbott Medical Optics, Alcon, Bausch & Lomb, HOYA, Kowa, NIDEK, Otsuka, Pfizer, Santen, Senju).

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Copyright information

© Japanese Ophthalmological Society 2017

Authors and Affiliations

  • Takaaki Hayashi
    • 1
    Email author
  • Hiroyuki Sasano
    • 2
  • Satoshi Katagiri
    • 2
  • Kazushige Tsunoda
    • 3
  • Shuhei Kameya
    • 4
  • Mitsuru Nakazawa
    • 5
  • Takeshi Iwata
    • 6
  • Hiroshi Tsuneoka
    • 2
  1. 1.Department of Ophthalmology, The Jikei University School of MedicineKatsushika Medical CenterTokyoJapan
  2. 2.Department of OphthalmologyThe Jikei University School of MedicineTokyoJapan
  3. 3.Laboratory of Visual Physiology, National Institute of Sensory OrgansNational Hospital Organization Tokyo Medical CenterTokyoJapan
  4. 4.Department of OphthalmologyNippon Medical School Chiba Hokusoh HospitalChibaJapan
  5. 5.Department of OphthalmologyHirosaki University Graduate School of MedicineHirosakiJapan
  6. 6.Division of Molecular and Cellular Biology, National Institute of Sensory OrgansNational Hospital Organization Tokyo Medical CenterTokyoJapan

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