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Daich Varela M, Motta FL, Webster AR, Arno G. A rare canonical splice-site variant in VPS13B causes attenuated Cohen syndrome. Ophthalmic Genet 2021; 43:110-115. [PMID: 34425733 DOI: 10.1080/13816810.2021.1970194] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
BACKGROUND To describe a patient with a history of obesity, retinal dystrophy, type II diabetes, and mild cognitive impairment; found to harbour biallelic splice-site variants in VPS13B. MATERIALS & METHODS A complete ophthalmic evaluation was performed at Moorfields Eye Hospital (London, United Kingdom), consisting of measurement of best-corrected visual acuity (BCVA), slit lamp and dilated fundus evaluation, colour, autofluorescence and near-infrared retinal imaging, spectral domain-optical coherence tomography, and electroretinogram (ERG). Whole-genome sequencing was performed as part of the UK's 100,000 Genomes Project. RESULTS A 26-year-old Pakistani man with normal appearance, stature, and head size presented with decreased BCVA and severely constricted visual fields to our Ophthalmic Genetics clinic. He had a history of obesity, type II diabetes, and mild cognitive impairment. His evaluation showed retina-wide, severe photoreceptor dysfunction in both eyes, with undetectable scotopic and photopic ERG waveforms. Genomic analysis identified a homozygous rare splice donor variant in the VPS13B gene (c.5024+2T>C) that was demonstrated to lead to skipping of the in-frame exon 31 (p.Gln1607_Ser1675delinsHis). CONCLUSIONS Exon 31 skipping in VPS13B may lead to a hypomorphic change, with partial gene function and an incomplete, mild Cohen syndrome-like phenotype.
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Affiliation(s)
- Malena Daich Varela
- UCL Institute of Ophthalmology, London, UK.,Moorfields Eye Hospital, London, UK
| | - Fabiana Louise Motta
- UCL Institute of Ophthalmology, London, UK.,Department of Ophthalmology, Universidade Federal de Sao Paulo, Sao Paulo, Brazil
| | - Andrew R Webster
- UCL Institute of Ophthalmology, London, UK.,Moorfields Eye Hospital, London, UK
| | - Gavin Arno
- UCL Institute of Ophthalmology, London, UK.,Moorfields Eye Hospital, London, UK.,North Thames Genomic Laboratory Hub, Great Ormond Street Hospital for Children NHS Foundation Trust, London, UK
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Gabrielle PH, Faivre L, Audo I, Zanlonghi X, Dollfus H, Thiadens AAHJ, Zeitz C, Mancini GMS, Perdomo Y, Mohand-Saïd S, Lizé E, Lhussiez V, Nandrot EF, Acar N, Creuzot-Garcher C, Sahel JA, Ansar M, Thauvin-Robinet C, Duplomb L, Da Costa R. Cystoid maculopathy is a frequent feature of Cohen syndrome-associated retinopathy. Sci Rep 2021; 11:16412. [PMID: 34385517 PMCID: PMC8361024 DOI: 10.1038/s41598-021-95743-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Accepted: 07/30/2021] [Indexed: 01/14/2023] Open
Abstract
Cohen syndrome (CS) is a rare syndromic form of rod-cone dystrophy. Recent case reports have suggested that cystoid maculopathy (CM) could affect CS patients with an early onset and high prevalence. Our study aims at improving our understanding and management of CM in CS patients through a retrospective case series of ten CS patients with identified pathogenic variants in VPS13B. Longitudinal optical coherence tomography (OCT) imaging was performed and treatment with carbonic anhydrase inhibitors (CAI) was provided to reduce the volume of cystoid spaces. CM affected eight out of ten patients in our cohort. The youngest patient showed a strong progression of macular cysts from the age of 4.5 to 5 years despite oral CAI medication. Other teenage and young adult patients showed stable macular cysts with and without treatment. One patient showed a moderate decrease of cystoid spaces in the absence of treatment at 22 years of age. Through a correlative analysis we found that the volume of cystoid spaces was positively correlated to the thickness of peripheral and macular photoreceptor-related layers. This study suggests that CAI treatments may not suffice to improve CM in CS patients, and that CM may resolve spontaneously during adulthood as photoreceptor dystrophy progresses.
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Affiliation(s)
- Pierre-Henry Gabrielle
- Department of Ophthalmology, University Hospital, 14 rue Paul Gaffarel, 21079, Dijon, France
| | - Laurence Faivre
- Inserm, UMR1231, Equipe GAD, Université de Bourgogne Franche Comté, Bâtiment B3, 15 Boulevard du Maréchal de Lattre de Tassigny, 21079, Dijon Cedex, France.,FHU TRANSLAD, CHU Dijon, 21000, Dijon, France.,Centre de Référence Anomalies du Développement et Syndromes Malformatifs, CHU Dijon, 21000, Dijon, France
| | - Isabelle Audo
- Sorbonne Université, INSERM, CNRS, Institut de La Vision, 17 rue Moreau, 75012, Paris, France.,CHNO Des Quinze-Vingts, DHU Sight Restore, INSERM-DGOS CIC 1423, 75012, Paris, France
| | - Xavier Zanlonghi
- Maladies Rares, Service d'Ophtalmologie, CHU Rennes, 2 rue Henri Le Guilloux, 35033, Rennes, France
| | - Hélène Dollfus
- Centre de Référence Pour Les Affections Rares en Génétique Ophtalmologique (CARGO), FSMR SENSGENE, ERN-EYE, Hôpitaux Universitaires de Strasbourg, 67000, Strasbourg, France.,Laboratoire de Génétique Médicale, Inserm, UMR1112, Institut de Génétique Médicale D'Alsace, Université de Strasbourg, 67000, Strasbourg, France
| | | | - Christina Zeitz
- Sorbonne Université, INSERM, CNRS, Institut de La Vision, 17 rue Moreau, 75012, Paris, France
| | - Grazia M S Mancini
- Department of Clinical Genetics, Erasmus MC, 3015, Rotterdam, The Netherlands
| | - Yaumara Perdomo
- Centre de Référence Pour Les Affections Rares en Génétique Ophtalmologique (CARGO), FSMR SENSGENE, ERN-EYE, Hôpitaux Universitaires de Strasbourg, 67000, Strasbourg, France.,Laboratoire de Génétique Médicale, Inserm, UMR1112, Institut de Génétique Médicale D'Alsace, Université de Strasbourg, 67000, Strasbourg, France
| | - Saddek Mohand-Saïd
- Sorbonne Université, INSERM, CNRS, Institut de La Vision, 17 rue Moreau, 75012, Paris, France.,CHNO Des Quinze-Vingts, DHU Sight Restore, INSERM-DGOS CIC 1423, 75012, Paris, France
| | - Eléonore Lizé
- Inserm, UMR1231, Equipe GAD, Université de Bourgogne Franche Comté, Bâtiment B3, 15 Boulevard du Maréchal de Lattre de Tassigny, 21079, Dijon Cedex, France
| | - Vincent Lhussiez
- Inserm, UMR1231, Equipe GAD, Université de Bourgogne Franche Comté, Bâtiment B3, 15 Boulevard du Maréchal de Lattre de Tassigny, 21079, Dijon Cedex, France
| | - Emeline F Nandrot
- Sorbonne Université, INSERM, CNRS, Institut de La Vision, 17 rue Moreau, 75012, Paris, France
| | - Niyazi Acar
- Centre Des Sciences du Goût Et de L'Alimentation, AgroSup Dijon, CNRS, INRA, Université Bourgogne Franche-Comté, 9E Boulevard Jeanne d'Arc, 21000, Dijon, France
| | - Catherine Creuzot-Garcher
- Department of Ophthalmology, University Hospital, 14 rue Paul Gaffarel, 21079, Dijon, France.,Centre Des Sciences du Goût Et de L'Alimentation, AgroSup Dijon, CNRS, INRA, Université Bourgogne Franche-Comté, 9E Boulevard Jeanne d'Arc, 21000, Dijon, France
| | - José-Alain Sahel
- Sorbonne Université, INSERM, CNRS, Institut de La Vision, 17 rue Moreau, 75012, Paris, France.,CHNO Des Quinze-Vingts, DHU Sight Restore, INSERM-DGOS CIC 1423, 75012, Paris, France.,Department of Ophthalmology, The University of Pittsburgh School of Medicine, Pittsburgh, PA, 15213, USA
| | - Muhammad Ansar
- Institute of Molecular and Clinical Ophthalmology Basel, 4031, Basel, Switzerland.,Department of Ophthalmology, Jules-Gonin Eye Hospital, University of Lausanne, 1004, Lausanne, Switzerland
| | - Christel Thauvin-Robinet
- Inserm, UMR1231, Equipe GAD, Université de Bourgogne Franche Comté, Bâtiment B3, 15 Boulevard du Maréchal de Lattre de Tassigny, 21079, Dijon Cedex, France.,FHU TRANSLAD, CHU Dijon, 21000, Dijon, France.,Centre de Référence Déficiences Intellectuelles de Causes Rares, CHU Dijon, 21000, Dijon, France
| | - Laurence Duplomb
- Inserm, UMR1231, Equipe GAD, Université de Bourgogne Franche Comté, Bâtiment B3, 15 Boulevard du Maréchal de Lattre de Tassigny, 21079, Dijon Cedex, France.,FHU TRANSLAD, CHU Dijon, 21000, Dijon, France
| | - Romain Da Costa
- Inserm, UMR1231, Equipe GAD, Université de Bourgogne Franche Comté, Bâtiment B3, 15 Boulevard du Maréchal de Lattre de Tassigny, 21079, Dijon Cedex, France. .,FHU TRANSLAD, CHU Dijon, 21000, Dijon, France.
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