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Young TL, Whisenhunt KN, Jin J, LaMartina SM, Martin SM, Souma T, Limviphuvadh V, Suri F, Souzeau E, Zhang X, Dan Y, Anagnos E, Carmona S, Jody NM, Stangel N, Higuchi EC, Huang SJ, Siggs OM, Simões MJ, Lawson BM, Martin JS, Elahi E, Narooie-Nejad M, Motlagh BF, Quaggin SE, Potter HD, Silva ED, Craig JE, Egas C, Maroofian R, Maurer-Stroh S, Bradfield YS, Tompson SW. SVEP1 as a Genetic Modifier of TEK-Related Primary Congenital Glaucoma. Invest Ophthalmol Vis Sci 2021; 61:6. [PMID: 33027505 PMCID: PMC7545080 DOI: 10.1167/iovs.61.12.6] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Purpose Affecting children by age 3, primary congenital glaucoma (PCG) can cause debilitating vision loss by the developmental impairment of aqueous drainage resulting in high intraocular pressure (IOP), globe enlargement, and optic neuropathy. TEK haploinsufficiency accounts for 5% of PCG in diverse populations, with low penetrance explained by variable dysgenesis of Schlemm's canal (SC) in mice. We report eight families with TEK-related PCG, and provide evidence for SVEP1 as a disease modifier in family 8 with a higher penetrance and severity. Methods Exome sequencing identified coding/splice site variants with an allele frequency less than 0.0001 (gnomAD). TEK variant effects were assayed in construct-transfected HEK293 cells via detection of autophosphorylated (active) TEK protein. An enucleated eye from an affected member of family 8 was examined via histology. SVEP1 expression in developing outflow tissues was detected by immunofluorescent staining of 7-day mouse anterior segments. SVEP1 stimulation of TEK expression in human umbilical vascular endothelial cells (HUVECs) was measured by TaqMan quantitative PCR. Results Heterozygous TEK loss-of-function alleles were identified in eight PCG families, with parent–child disease transmission observed in two pedigrees. Family 8 exhibited greater disease penetrance and severity, histology revealed absence of SC in one eye, and SVEP1:p.R997C was identified in four of the five affected individuals. During SC development, SVEP1 is secreted by surrounding tissues. SVEP1:p.R997C abrogates stimulation of TEK expression by HUVECs. Conclusions We provide further evidence for PCG caused by TEK haploinsufficiency, affirm autosomal dominant inheritance in two pedigrees, and propose SVEP1 as a modifier of TEK expression during SC development, affecting disease penetrance and severity.
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Affiliation(s)
- Terri L Young
- Department of Ophthalmology and Visual Sciences, University of Wisconsin-Madison, Madison, Wisconsin, United States
| | - Kristina N Whisenhunt
- Department of Ophthalmology and Visual Sciences, University of Wisconsin-Madison, Madison, Wisconsin, United States
| | - Jing Jin
- Feinberg Cardiovascular Research Institute and Division of Nephrology/Hypertension, Northwestern University Feinberg School of Medicine, Chicago, Illinois, United States
| | - Sarah M LaMartina
- Department of Ophthalmology and Visual Sciences, University of Wisconsin-Madison, Madison, Wisconsin, United States
| | - Sean M Martin
- Department of Ophthalmology and Visual Sciences, University of Wisconsin-Madison, Madison, Wisconsin, United States
| | - Tomokazu Souma
- Feinberg Cardiovascular Research Institute and Division of Nephrology/Hypertension, Northwestern University Feinberg School of Medicine, Chicago, Illinois, United States
| | - Vachiranee Limviphuvadh
- Bioinformatics Institute (BII), Agency for Science Technology and Research (A*STAR), Singapore.,Innovations in Food & Chemical Safety Programme (IFCS), A*STAR, Singapore
| | - Fatemeh Suri
- Ophthalmic Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Emmanuelle Souzeau
- Department of Ophthalmology, Flinders University, Flinders Medical Centre, Adelaide, South Australia, Australia
| | - Xue Zhang
- Feinberg Cardiovascular Research Institute and Division of Nephrology/Hypertension, Northwestern University Feinberg School of Medicine, Chicago, Illinois, United States
| | - Yongwook Dan
- Feinberg Cardiovascular Research Institute and Division of Nephrology/Hypertension, Northwestern University Feinberg School of Medicine, Chicago, Illinois, United States
| | - Evie Anagnos
- Feinberg Cardiovascular Research Institute and Division of Nephrology/Hypertension, Northwestern University Feinberg School of Medicine, Chicago, Illinois, United States
| | - Susana Carmona
- Biocant, Transfer Technology Association, Cantanhede, Portugal.,Faculty of Medicine, University of Coimbra, Coimbra, Portugal
| | - Nicole M Jody
- Department of Ophthalmology and Visual Sciences, University of Wisconsin-Madison, Madison, Wisconsin, United States
| | - Nickie Stangel
- Department of Ophthalmology and Visual Sciences, University of Wisconsin-Madison, Madison, Wisconsin, United States
| | - Emily C Higuchi
- Department of Ophthalmology and Visual Sciences, University of Wisconsin-Madison, Madison, Wisconsin, United States
| | - Samuel J Huang
- Department of Ophthalmology and Visual Sciences, University of Wisconsin-Madison, Madison, Wisconsin, United States
| | - Owen M Siggs
- Department of Ophthalmology, Flinders University, Flinders Medical Centre, Adelaide, South Australia, Australia
| | | | - Brendan M Lawson
- Department of Ophthalmology and Visual Sciences, University of Wisconsin-Madison, Madison, Wisconsin, United States
| | - Jacob S Martin
- Department of Ophthalmology and Visual Sciences, University of Wisconsin-Madison, Madison, Wisconsin, United States
| | - Elahe Elahi
- School of Biology, University College of Science, University of Tehran, Tehran, Iran
| | - Mehrnaz Narooie-Nejad
- Genetics of Non-communicable Disease Research Center, Zahedan University of Medical Science, Zahedan, Iran
| | | | - Susan E Quaggin
- Feinberg Cardiovascular Research Institute and Division of Nephrology/Hypertension, Northwestern University Feinberg School of Medicine, Chicago, Illinois, United States
| | - Heather D Potter
- Department of Ophthalmology and Visual Sciences, University of Wisconsin-Madison, Madison, Wisconsin, United States
| | - Eduardo D Silva
- Faculty of Medicine, Institute for Biomedical Imaging and Life Sciences, University of Coimbra, Coimbra, Portugal
| | - Jamie E Craig
- Department of Ophthalmology, Flinders University, Flinders Medical Centre, Adelaide, South Australia, Australia
| | - Conceição Egas
- Biocant, Transfer Technology Association, Cantanhede, Portugal.,Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal
| | - Reza Maroofian
- Genetics Research Center, Molecular and Clinical Sciences Institute, St George's, University of London, Cranmer Terrace, London, United Kingdom
| | - Sebastian Maurer-Stroh
- Bioinformatics Institute (BII), Agency for Science Technology and Research (A*STAR), Singapore.,Innovations in Food & Chemical Safety Programme (IFCS), A*STAR, Singapore.,Department of Biological Sciences, National University of Singapore (NUS), Singapore
| | - Yasmin S Bradfield
- Department of Ophthalmology and Visual Sciences, University of Wisconsin-Madison, Madison, Wisconsin, United States
| | - Stuart W Tompson
- Department of Ophthalmology and Visual Sciences, University of Wisconsin-Madison, Madison, Wisconsin, United States
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