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Gaulier A, Guindolet D, Cochereau I, Gabison E, Stéphan S. [Alport syndrome presenting as posterior polymorphous corneal dystrophy: Case report]. J Fr Ophtalmol 2024:104204. [PMID: 38744569 DOI: 10.1016/j.jfo.2024.104204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2023] [Revised: 01/27/2024] [Accepted: 02/17/2024] [Indexed: 05/16/2024]
Affiliation(s)
- A Gaulier
- Service d'ophtalmologie, fondation ophtalmologique Adolphe-de-Rothschild, 25, rue Manin, 75019 Paris, France; Service d'ophtalmologie, centre hospitalo-universitaire de Nantes, 1, place Alexis-Ricordeau, 44000 Nantes, France.
| | - D Guindolet
- Service d'ophtalmologie, fondation ophtalmologique Adolphe-de-Rothschild, 25, rue Manin, 75019 Paris, France; Service d'ophtalmologie, hôpital Bichat Claude-Bernard, 46, rue Henri-Huchard, 75018 Paris, France
| | - I Cochereau
- Service d'ophtalmologie, fondation ophtalmologique Adolphe-de-Rothschild, 25, rue Manin, 75019 Paris, France; Service d'ophtalmologie, hôpital Bichat Claude-Bernard, 46, rue Henri-Huchard, 75018 Paris, France; Université de Paris, Paris, France
| | - E Gabison
- Service d'ophtalmologie, fondation ophtalmologique Adolphe-de-Rothschild, 25, rue Manin, 75019 Paris, France; Service d'ophtalmologie, hôpital Bichat Claude-Bernard, 46, rue Henri-Huchard, 75018 Paris, France; Université de Paris, Paris, France
| | - S Stéphan
- Service d'ophtalmologie, fondation ophtalmologique Adolphe-de-Rothschild, 25, rue Manin, 75019 Paris, France
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Murugan S, de Campos VS, Ghag SA, Ng M, Shyam R. Characterization of a Novel Mouse Model for Fuchs Endothelial Corneal Dystrophy. Invest Ophthalmol Vis Sci 2024; 65:18. [PMID: 38587441 PMCID: PMC11005065 DOI: 10.1167/iovs.65.4.18] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2023] [Accepted: 03/23/2024] [Indexed: 04/09/2024] Open
Abstract
Purpose Fuchs endothelial corneal dystrophy (FECD) is a progressive blinding disorder, characterized by increased corneal endothelial excrescences (guttae), corneal endothelial cell loss, and edema. These symptoms are hypothesized to be caused by changes in the extracellular matrix (ECM) and mitochondrial dysfunction in the corneal endothelium. Despite this clinical and biological relevance, a comprehensive animal model that recapitulates all the major disease characteristics is currently unavailable. In this study, we develop such a model to improve our understanding of the signaling pathways involved in the FECD progression and develop strategies for early intervention. Method To generate a comprehensive FECD model, we generated a double mutant mouse bearing tamoxifen-inducible knockdown of Slc4a11 and the Col8a2 (Q455K) mutation. We performed optical coherence tomography (OCT) and in vivo confocal microscopy using the Heidelberg Retinal Tomography 3 - Rostock Cornea module (HRT3-RCM) on the mice at 5 weeks of age before tamoxifen feeding to establish baseline values for corneal thickness, endothelial cell density, and test for the presence of guttae. We measured these parameters again post-tamoxifen treatment at 16 weeks of age. We collected corneas at 16 weeks to perform histopathology, immunofluorescence staining for tight junctions, adherens junctions, and oxidative stress. We evaluated endothelial pump function using a lactate assay. Results The double mutant tamoxifen-fed animals showed the presence of guttae, and displayed increased corneal thickness and decreased endothelial cell density. Endothelial cells showed altered morphology with disrupted adherens junctions and elevated reactive oxygen species (ROS). Finally, we found that stromal lactate concentrations were elevated in the double mutant mice, indicative of compromised endothelial pump function. Conclusions Overall, this mouse model recapitulates all the important phenotypic features associated with FECD.
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Affiliation(s)
- Subashree Murugan
- Vision Science Program, School of Optometry, Indiana University Bloomington, Indiana, United States
| | - Viviane Souza de Campos
- Vision Science Program, School of Optometry, Indiana University Bloomington, Indiana, United States
| | - Sachin Anil Ghag
- Vision Science Program, School of Optometry, Indiana University Bloomington, Indiana, United States
| | - Matthew Ng
- Department of Biology, Indiana University Bloomington, Indiana, United States
| | - Rajalekshmy Shyam
- Vision Science Program, School of Optometry, Indiana University Bloomington, Indiana, United States
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Nkanga ED, Umana UE, Ibanga AA, Nkanga ED, Ezeh EI, Ani EU, Nkanga DG, Etim BA, Akpan SI. Pediatric Corneal Transplantation in Uyo, Nigeria: Early Experiences. Niger J Clin Pract 2023; 26:1772-1776. [PMID: 38044787 DOI: 10.4103/njcp.njcp_459_23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Accepted: 08/11/2023] [Indexed: 12/05/2023]
Abstract
ABSTRACT The burden of avoidable blindness from corneal disease is significantly higher where access to specialist eye care, the cost of treatment and the treatment infrastructure including eye banking, are beyond the reach of the impoverished masses. Corneal transplantation in children is challenging: it is more technically complex; patients often require multiple examinations under general anaesthesia to optimize treatment outcomes. There is also the increased risk of several complications including graft dehiscence, infection, rejection, and inappropriate patient or caregiver care. However, when successful, it restores vision. We present a report of our initial experience with penetrating keratoplasty in 2 children with blinding corneal disease in Uyo, Nigeria. Corneal transplantation history was retrieved and data (including data on age, sex, aetiology of corneal disease, indications for corneal transplantation, pre-operative and post-operative visual acuity and intraocular pressure measurements) was extracted for this report. Both patients had standard penetrating keratoplasty performed by one surgeon, under general anaesthesia. Case one was a 10-year-old male presenting with profound visual impairment from congenital hereditary endothelial dystrophy. His best corrected post-operative visual acuity was 6/24. Case two was a 3-year-old male with vision loss due to a corneal leucoma following treated herpes simplex keratitis. Post-operatively, his best corrected visual acuity improved to 6/12. Corneal graft tissue remained clear at more than 3 years of follow-up. Although amblyopia was a notable co-morbidity, corneal transplantation significantly improved their vision. Corneal banking services are advocated for in resource-limited settings where the magnitude of corneal blindness is greatest.
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Affiliation(s)
- E D Nkanga
- Paediatric Ophthalmology and Strabismus Unit, Department of Ophthalmology, University of Calabar, Calabar, Cross River State, Nigeria
| | - Ui E Umana
- Department of Ophthalmology, Marion Eye Centre, Marion, Illinois, USA
| | - A A Ibanga
- Department of Ophthalmology, University of Calabar, Calabar, Cross River State, Nigeria
| | - E D Nkanga
- Department of Pediatrics, All Saints University of Medicine, Common Wealth of Dominica, Rivers State, Nigeria
| | - E I Ezeh
- Department of Ophthalmology, University of Calabar, Calabar, Cross River State, Nigeria
| | - E U Ani
- Department of Ophthalmology, The Ophthalmic Specialists, Port Harcourt, Rivers State, Nigeria
| | - D G Nkanga
- Department of Ophthalmology, University of Calabar, Calabar, Cross River State, Nigeria
| | - B A Etim
- Department of Ophthalmology, University of Calabar, Calabar, Cross River State, Nigeria
| | - S I Akpan
- Department of Ophthalmology, University of Uyo Teaching Hospital, Uyo, Akwa Ibom State, Nigeria
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Tsedilina TR, Sharova E, Iakovets V, Skorodumova LO. Systematic review of SLC4A11, ZEB1, LOXHD1, and AGBL1 variants in the development of Fuchs' endothelial corneal dystrophy. Front Med (Lausanne) 2023; 10:1153122. [PMID: 37441688 PMCID: PMC10333596 DOI: 10.3389/fmed.2023.1153122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2023] [Accepted: 03/30/2023] [Indexed: 07/15/2023] Open
Abstract
Introduction The pathogenic role of variants in TCF4 and COL8A2 in causing Fuchs' endothelial corneal dystrophy (FECD) is not controversial and has been confirmed by numerous studies. The causal role of other genes, SLC4A11, ZEB1, LOXHD1, and AGBL1, which have been reported to be associated with FECD, is more complicated and less obvious. We performed a systematic review of the variants in the above-mentioned genes in FECD cases, taking into account the currently available population frequency information, transcriptomic data, and the results of functional studies to assess their pathogenicity. Methods Search for articles published in 2005-2022 was performed manually between July 2022 and February 2023. We searched for original research articles in peer-reviewed journals, written in English. Variants in the genes of interest identified in patients with FECD were extracted for the analysis. We classified each presented variant by pathogenicity status according to the ACMG criteria implemented in the Varsome tool. Diagnosis, segregation data, presence of affected relatives, functional analysis results, and gene expression in the corneal endothelium were taken into account. Data on the expression of genes of interest in the corneal endothelium were extracted from articles in which transcriptome analysis was performed. The identification of at least one variant in a gene classified as pathogenic or significantly associated with FECD was required to confirm the causal role of the gene in FECD. Results The analysis included 34 articles with 102 unique ZEB1 variants, 20 articles with 64 SLC4A11 variants, six articles with 26 LOXHD1 variants, and five articles with four AGBL1 variants. Pathogenic status was confirmed for seven SLC4A11 variants found in FECD. No variants in ZEB1, LOXHD1, and AGBL1 genes were classified as pathogenic for FECD. According to the transcriptome data, AGBL1 and LOXHD1 were not expressed in the corneal endothelium. Functional evidence for the association of LOXHD1, and AGBL1 with FECD was conflicting. Conclusion Our analysis confirmed the causal role of SLC4A11 variants in the development of FECD. The causal role of ZEB1, LOXHD1, and AGBL1 variants in FECD has not been confirmed. Further evidence from familial cases and functional analysis is needed to confirm their causal roles in FECD.
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Affiliation(s)
- Tatiana Romanovna Tsedilina
- Laboratory of Human Molecular Genetics, Lopukhin Federal Research and Clinical Center of Physical-Chemical Medicine of Federal Medical Biological Agency, Moscow, Russia
| | - Elena Sharova
- Laboratory of Human Molecular Genetics, Lopukhin Federal Research and Clinical Center of Physical-Chemical Medicine of Federal Medical Biological Agency, Moscow, Russia
| | - Valeriia Iakovets
- Laboratory of Human Molecular Genetics, Lopukhin Federal Research and Clinical Center of Physical-Chemical Medicine of Federal Medical Biological Agency, Moscow, Russia
- I.M. Sechenov First Moscow State Medical University, Moscow, Russia
| | - Liubov Olegovna Skorodumova
- Laboratory of Human Molecular Genetics, Lopukhin Federal Research and Clinical Center of Physical-Chemical Medicine of Federal Medical Biological Agency, Moscow, Russia
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Serpen JY, Presley W, Beil A, Armenti ST, Johnson K, Mian SI, Innis JW, Prasov L. A Novel 13q12 Microdeletion Associated with Familial Syndromic Corneal Opacification. Genes (Basel) 2023; 14:1034. [PMID: 37239394 PMCID: PMC10218699 DOI: 10.3390/genes14051034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Revised: 04/21/2023] [Accepted: 04/23/2023] [Indexed: 05/28/2023] Open
Abstract
Progressive corneal opacification can result from multiple etiologies, including corneal dystrophies or systemic and genetic diseases. We describe a novel syndrome featuring progressive epithelial and anterior stromal opacification in a brother and sister and their mildly affected father, with all three family members having sensorineural hearing loss and two also with tracheomalacia/laryngomalacia. All carried a 1.2 Mb deletion at chromosome 13q12.11, with no other noteworthy co-segregating variants identified on clinical exome or chromosomal microarray. RNAseq analysis from an affected corneal epithelial sample from the proband's brother revealed downregulation of XPO4, IFT88, ZDHHC20, LATS2, SAP18, and EEF1AKMT1 within the microdeletion interval, with no notable effect on the expression of nearby genes. Pathway analysis showed upregulation of collagen metabolism and extracellular matrix (ECM) formation/maintenance, with no significantly down-regulated pathways. Analysis of overlapping deletions/variants demonstrated that deleterious variants in XPO4 were found in patients with laryngomalacia and sensorineural hearing loss, with the latter phenotype also being a feature of variants in the partially overlapping DFNB1 locus, yet none of these had reported corneal phenotypes. Together, these data define a novel microdeletion-associated syndromic progressive corneal opacification and suggest that a combination of genes within the microdeletion may contribute to ECM dysregulation leading to pathogenesis.
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Affiliation(s)
- Jasmine Y. Serpen
- Department of Ophthalmology and Visual Sciences, Kellogg Eye Center, University of Michigan, Ann Arbor, MI 48105, USA
- Case Western Reserve University School of Medicine, Cleveland, OH 44106, USA
| | - William Presley
- Department of Human Genetics, University of Michigan, Ann Arbor, MI 48109, USA
| | - Adelyn Beil
- Department of Pediatrics, University of Michigan, Ann Arbor, MI 48109, USA
| | - Stephen T. Armenti
- Department of Ophthalmology and Visual Sciences, Kellogg Eye Center, University of Michigan, Ann Arbor, MI 48105, USA
- Department of Ophthalmology, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Kayla Johnson
- Department of Ophthalmology and Visual Sciences, Kellogg Eye Center, University of Michigan, Ann Arbor, MI 48105, USA
- Case Western Reserve University School of Medicine, Cleveland, OH 44106, USA
| | - Shahzad I. Mian
- Department of Ophthalmology and Visual Sciences, Kellogg Eye Center, University of Michigan, Ann Arbor, MI 48105, USA
| | - Jeffrey W. Innis
- Department of Human Genetics, University of Michigan, Ann Arbor, MI 48109, USA
- Department of Pediatrics, University of Michigan, Ann Arbor, MI 48109, USA
| | - Lev Prasov
- Department of Ophthalmology and Visual Sciences, Kellogg Eye Center, University of Michigan, Ann Arbor, MI 48105, USA
- Department of Human Genetics, University of Michigan, Ann Arbor, MI 48109, USA
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