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Documenta Ophthalmologica

, Volume 136, Issue 2, pp 135–143 | Cite as

Retinal findings in a patient of French ancestry with CABP4-related retinal disease

  • Vasily Mikhaïlovitch Smirnov
  • Christina Zeitz
  • Nagasamy Soumittra
  • Isabelle Audo
  • Sabine Defoort-Dhellemmes
Clinical Case Report
First Online:
Received:
Accepted:

Abstract

Introduction

CABP4-related retinal dysfunction is a cone–rod synaptic transmission disorder with electronegative electroretinogram (ERG) waveform. It is a rare retinal dysfunction that can be classified into the incomplete form of congenital stationary night blindness. Absent foveal reflex and overall foveal thinning were previously reported, but in most cases the fundus appearance was described as nearly normal. We report here peculiar macular changes in a patient of French ancestry harbouring CABP4 mutations.

Methods

Complete ocular examination and full-field ERG were performed at the initial presentation and follow-up. Multimodal fundus imagining, including spectral-domain optical coherence tomography, colour, infrared reflectance and short-wavelength autofluorescence photographs, was performed during follow-up visits.

Results

A 7-month-old infant was addressed to our department for visual unresponsiveness and nystagmus. ERG had an electronegative waveform, even for light-adapted stimuli, thus supporting the diagnosis of photoreceptor–bipolar cell transmission disorder. Genetic investigations discovered a compound heterozygous mutation in CABP4: c.646C > T, p.Arg216*/c.673C > T, p.Arg225*. Multimodal fundus imaging, performed at follow-up visits, showed fine radial folds at the vitreomacular interface and dark foveal dots in both eyes. Optic coherence tomography revealed a focal foveal ellipsoid zone gap.

Discussion

Initial presentation was misleading with Leber congenital amaurosis. The electronegative ERG waveform reoriented the genetic investigations and thus establishing a correct diagnosis. To the best of our knowledge, the peculiar fundus changes observed in our patient were never reported before. We hypothesized that a foveal ellipsoid zone interruption discovered in our patient could reflect mostly a cone dysfunction. It was unclear whether the fine radial folds in both maculae were linked with high hyperopia or were an intrinsic feature of the retinal disease.

Conclusion

CABP4-related retinal disease is a cone–rod system disorder with possible foveal abnormalities.

Keywords

CABP4 Electroretinography Hemeralopia OCT Multimodal fundus imaging 
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Notes

Acknowledgements

We thank the family for participating in the study. We are grateful to Mr. Philippe Debruyne, Engineer in Exploration of Visual Function and Neuro-Ophthalmology Department, who kindly helped us for the illustration. We also thank Aline Antonio for DNA extraction and Christel Condroyer for Sanger sequencing validation.

Compliance with ethical standards

Conflict of interest

None.

Statement of human rights

This retrospective study was approved by our Institutional Review Board and fulfilled the tenets of the Declaration of Helsinki.

Statement on the welfare of animals

No animals participed in this study.

Informed consent

Informed consent was obtained for all participants to the study.

Patient consent

Patients’ parents have consented to the submission of the case report to the journal.

Fundings

Indian Council of Medical Research and INSERM (France), an Indo-French collaborative program (No: 53/1/Indo-Foreign/Oph/10-NCD-II).

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Vasily Mikhaïlovitch Smirnov
    • 1
    • 6
  • Christina Zeitz
    • 2
  • Nagasamy Soumittra
    • 4
  • Isabelle Audo
    • 2
    • 3
    • 5
  • Sabine Defoort-Dhellemmes
    • 1
  1. 1.Exploration of Vision and Neuro-Ophthalmology DepartmentLille University HospitalLille CedexFrance
  2. 2.UPMC Univ Paris 06, INSERM U968, CNRS UMR 7210, Institut de la VisionSorbonne UniversitésParisFrance
  3. 3.DHU ViewMaintain, INSERM-DHOS CIC 1423Centre Hospitalier National d’Ophtalmologie des Quinze-VingtsParisFrance
  4. 4.SN ONGC Department of Genetics and Molecular Biology, Vision Research FoundationChennaiIndia
  5. 5.University College London Institute of OphthalmologyLondonUK
  6. 6.Faculté de MédecineUniversité de LilleLille CedexFrance

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