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Mao M, Kuo YM, Yu AK, Labelle-Dumais C, Ou Y, Gould DB. TGFβ Signaling Dysregulation May Contribute to COL4A1-Related Glaucomatous Optic Nerve Damage. Invest Ophthalmol Vis Sci 2024; 65:15. [PMID: 38717426 PMCID: PMC11090142 DOI: 10.1167/iovs.65.5.15] [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: 02/20/2024] [Accepted: 04/22/2024] [Indexed: 05/15/2024] Open
Abstract
Purpose Mutations in the genes encoding type IV collagen alpha 1 (COL4A1) and alpha 2 (COL4A2) cause a multisystem disorder that includes ocular anterior segment dysgenesis (ASD) and glaucoma. We previously showed that transforming growth factor beta (TGFβ) signaling was elevated in developing anterior segments from Col4a1 mutant mice and that reducing TGFβ signaling ameliorated ASD, supporting a role for the TGFβ pathway in disease pathogenesis. Here, we tested whether altered TGFβ signaling also contributes to glaucoma-related phenotypes in Col4a1 mutant mice. Methods To test the role of TGFβ signaling in glaucoma-relevant phenotypes, we genetically reduced TGFβ signaling using mice with mutated Tgfbr2, which encodes the common receptor for all TGFβ ligands in Col4a1+/G1344D mice. We performed slit-lamp biomicroscopy and optical coherence tomography for qualitative and quantitative analyses of anterior and posterior ocular segments, histological analyses of ocular tissues and optic nerves, and intraocular pressure assessments using rebound tonometry. Results Col4a1+/G1344D mice showed defects of the ocular drainage structures, including iridocorneal adhesions, and phenotypes consistent with glaucomatous neurodegeneration, including thinning of the nerve fiber layer, retinal ganglion cell loss, optic nerve head excavation, and optic nerve degeneration. We found that reducing TGFβ receptor 2 (TGFBR2) was protective for ASD, ameliorated ocular drainage structure defects, and protected against glaucomatous neurodegeneration in Col4a1+/G1344D mice. Conclusions Our results suggest that elevated TGFβ signaling contributes to glaucomatous neurodegeneration in Col4a1 mutant mice.
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Affiliation(s)
- Mao Mao
- Department of Ophthalmology, University of California, San Francisco, San Francisco, California, United States
| | - Yien-Ming Kuo
- Department of Ophthalmology, University of California, San Francisco, San Francisco, California, United States
| | - Alfred K. Yu
- Department of Ophthalmology, University of California, San Francisco, San Francisco, California, United States
| | - Cassandre Labelle-Dumais
- Department of Ophthalmology, University of California, San Francisco, San Francisco, California, United States
| | - Yvonne Ou
- Department of Ophthalmology, University of California, San Francisco, San Francisco, California, United States
| | - Douglas B. Gould
- Department of Ophthalmology, University of California, San Francisco, San Francisco, California, United States
- Department of Anatomy, Institute for Human Genetics, Cardiovascular Research Institute, and Bakar Aging Research Institute, University of California, San Francisco, San Francisco, California, United States
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Zhu D, Li P, Wang L, He Y, Zhang HZ. Aberrant expression of COL4A1 in age-related cataract and its effect on cell proliferation, apoptosis and gene expression changes. Int J Ophthalmol 2023; 16:333-341. [PMID: 36935791 PMCID: PMC10009602 DOI: 10.18240/ijo.2023.03.01] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Accepted: 01/12/2023] [Indexed: 03/06/2023] Open
Abstract
AIM To evaluate the regulation of the aberrant expression of collagen type IV alpha 1 chain (COL4A1) in the development of age-related cataract (ARC). METHODS Quantitative reverse transcription-polymerase chain reaction (qRT-PCR) and Western blot analysis were employed to evaluate the expression of COL4A1 in ARC patients and healthy controls. The proliferation, apoptosis, cell cycle and epithelial-mesenchymal transition (EMT) of human lens epithelial cell (HLE-B3) were further analyzed under the condition of COL4A1 gene silence. Alteration of gene expression at mRNA level after knockdown COL4A1 were also evaluated by qRT-PCR on HLE-B3 cells. RESULTS The aberrant expression of COL4A1 was identified a clinically associated with the ARC. Silencing of COL4A1 promoted the apoptosis and inhibited the proliferation of HLE-B3 by blocking the cell cycle. Moreover, COL4A1 gene silence didn't affect the cytoskeleton of HLE-B3 but down-regulated the Collagen type IV Alpha 2 Chain (COL4A2), paired box 6 (PAX6), procollagen-lysine 2-oxoglutarate 5-dioxygenases 1 (PLOD1) and procollagen-lysine 2-oxoglutarate 5-dioxygenases 2 (PLOD2) expression levels in HLE-B3 cells. Silencing the COL4A1 gene induced EMT of the HLE-B3 cells by promoting the transforming growth factor beta (TGF-β) expression. CONCLUSION Silencing of COL4A1 induces S-phase arrest, also inhibits the proliferation and enhance HLE-B3 apoptosis and EMT, and down-regulates the expression of COL4A2, PAX6, PLOD1 and PLOD2. Thus, the expression alteration of COL4A1 may play a critical role in the pathogenesis of ARC.
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Affiliation(s)
- Dan Zhu
- Department of Optometry, Xi'an Medical University, Xi'an 710021, Shaanxi Province, China
| | - Peng Li
- Department of Ophthalmology, Xijing 986 Hospital Department, Fourth Military Medical University, Xi'an 710054, Shaanxi Province, China
| | - Li Wang
- Department of Optometry, Xi'an Medical University, Xi'an 710021, Shaanxi Province, China
| | - Yuan He
- Department of Optometry, Xi'an Medical University, Xi'an 710021, Shaanxi Province, China
- Department of Ophthalmology, The Second Affiliated Hospital of Xi'an Medical University, Xi'an 710038, Shaanxi Province, China
| | - Hui-Zi Zhang
- Department of Optometry, Xi'an Medical University, Xi'an 710021, Shaanxi Province, China
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Yoon B, Yeung P, Santistevan N, Bluhm LE, Kawasaki K, Kueper J, Dubielzig R, VanOudenhove J, Cotney J, Liao EC, Grinblat Y. Zebrafish models of alx-linked frontonasal dysplasia reveal a role for Alx1 and Alx3 in the anterior segment and vasculature of the developing eye. Biol Open 2022; 11:bio059189. [PMID: 35142342 PMCID: PMC9167625 DOI: 10.1242/bio.059189] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2022] [Accepted: 01/28/2022] [Indexed: 11/18/2022] Open
Abstract
The cellular and genetic mechanisms that coordinate formation of facial sensory structures with surrounding skeletal and soft tissue elements remain poorly understood. Alx1, a homeobox transcription factor, is a key regulator of midfacial morphogenesis. ALX1 mutations in humans are linked to severe congenital anomalies of the facial skeleton (frontonasal dysplasia, FND) with malformation or absence of eyes and orbital contents (micro- and anophthalmia). Zebrafish with loss-of-function alx1 mutations develop with craniofacial and ocular defects of variable penetrance, likely due to compensatory upregulation in expression of a paralogous gene, alx3. Here we show that zebrafish alx1;alx3 mutants develop with highly penetrant cranial and ocular defects that resemble human ALX1-linked FND. alx1 and alx3 are expressed in anterior cranial neural crest (aCNC), which gives rise to the anterior neurocranium (ANC), anterior segment structures of the eye and vascular pericytes. Consistent with a functional requirement for alx genes in aCNC, alx1; alx3 mutants develop with nearly absent ANC and grossly aberrant hyaloid vasculature and ocular anterior segment, but normal retina. In vivo lineage labeling identified a requirement for alx1 and alx3 during aCNC migration, and transcriptomic analysis suggested oxidative stress response as a key target mechanism of this function. Oxidative stress is a hallmark of fetal alcohol toxicity, and we found increased penetrance of facial and ocular malformations in alx1 mutants exposed to ethanol, consistent with a protective role for alx1 against ethanol toxicity. Collectively, these data demonstrate a conserved role for zebrafish alx genes in controlling ocular and facial development, and a novel role in protecting these key midfacial structures from ethanol toxicity during embryogenesis. These data also reveal novel roles for alx genes in ocular anterior segment formation and vascular development and suggest that retinal deficits in alx mutants may be secondary to aberrant ocular vascularization and anterior segment defects. This study establishes robust zebrafish models for interrogating conserved genetic mechanisms that coordinate facial and ocular development, and for exploring gene--environment interactions relevant to fetal alcohol syndrome.
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Affiliation(s)
- Baul Yoon
- Departments of Integrative Biology and Neuroscience, University of Wisconsin, Madison, WI 53706, USA
- Genetics Ph.D. Training Program, University of Wisconsin, Madison, WI 53706, USA
| | - Pan Yeung
- Center for Regenerative Medicine, Department of Surgery, Massachusetts General Hospital, Harvard Medical School, and Shriners Hospital for Children, Boston, 02114, USA
| | - Nicholas Santistevan
- Departments of Integrative Biology and Neuroscience, University of Wisconsin, Madison, WI 53706, USA
- Genetics Ph.D. Training Program, University of Wisconsin, Madison, WI 53706, USA
| | - Lauren E. Bluhm
- Departments of Integrative Biology and Neuroscience, University of Wisconsin, Madison, WI 53706, USA
| | - Kenta Kawasaki
- Center for Regenerative Medicine, Department of Surgery, Massachusetts General Hospital, Harvard Medical School, and Shriners Hospital for Children, Boston, 02114, USA
| | - Janina Kueper
- Center for Regenerative Medicine, Department of Surgery, Massachusetts General Hospital, Harvard Medical School, and Shriners Hospital for Children, Boston, 02114, USA
- Institute of Human Genetics, University of Bonn, Venusberg-Campus 1, 53127 Bonn, Germany
| | - Richard Dubielzig
- Comparative Ocular Pathology Laboratory of Wisconsin (COPLOW), University of Wisconsin, Madison, WI 53706, USA
| | - Jennifer VanOudenhove
- University of Connecticut School of Medicine, Department of Genetics and Genome Sciences, Farmington, CT 06030, USA
| | - Justin Cotney
- University of Connecticut School of Medicine, Department of Genetics and Genome Sciences, Farmington, CT 06030, USA
| | - Eric C. Liao
- Center for Regenerative Medicine, Department of Surgery, Massachusetts General Hospital, Harvard Medical School, and Shriners Hospital for Children, Boston, 02114, USA
| | - Yevgenya Grinblat
- Departments of Integrative Biology and Neuroscience, University of Wisconsin, Madison, WI 53706, USA
- Genetics Ph.D. Training Program, University of Wisconsin, Madison, WI 53706, USA
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Balikov DA, Jacobson A, Prasov L. Glaucoma Syndromes: Insights into Glaucoma Genetics and Pathogenesis from Monogenic Syndromic Disorders. Genes (Basel) 2021; 12:genes12091403. [PMID: 34573386 PMCID: PMC8471311 DOI: 10.3390/genes12091403] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Revised: 09/02/2021] [Accepted: 09/08/2021] [Indexed: 11/21/2022] Open
Abstract
Monogenic syndromic disorders frequently feature ocular manifestations, one of which is glaucoma. In many cases, glaucoma in children may go undetected, especially in those that have other severe systemic conditions that affect other parts of the eye and the body. Similarly, glaucoma may be the first presenting sign of a systemic syndrome. Awareness of syndromes associated with glaucoma is thus critical both for medical geneticists and ophthalmologists. In this review, we highlight six categories of disorders that feature glaucoma and other ocular or systemic manifestations: anterior segment dysgenesis syndromes, aniridia, metabolic disorders, collagen/vascular disorders, immunogenetic disorders, and nanophthalmos. The genetics, ocular and systemic features, and current and future treatment strategies are discussed. Findings from rare diseases also uncover important genes and pathways that may be involved in more common forms of glaucoma, and potential novel therapeutic strategies to target these pathways.
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Affiliation(s)
- Daniel A. Balikov
- Department of Ophthalmology and Visual Sciences, University of Michigan, Ann Arbor, MI 48105, USA; (D.A.B.); (A.J.)
| | - Adam Jacobson
- Department of Ophthalmology and Visual Sciences, University of Michigan, Ann Arbor, MI 48105, USA; (D.A.B.); (A.J.)
| | - Lev Prasov
- Department of Ophthalmology and Visual Sciences, University of Michigan, Ann Arbor, MI 48105, USA; (D.A.B.); (A.J.)
- Department of Human Genetics, University of Michigan, Ann Arbor, MI 48109, USA
- Correspondence:
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Fukunaga Y, Ogawa T, Suzuki H, Okada Y, Nakazawa T, Yamaguchi Y. Anterior segment dysmorphogenesis of the eye and glaucoma in MG-W gerbils. J Toxicol Pathol 2021; 34:245-249. [PMID: 34290480 PMCID: PMC8280303 DOI: 10.1293/tox.2020-0090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Accepted: 03/31/2021] [Indexed: 11/19/2022] Open
Abstract
Unilaterally swollen eyes were histopathologically characterized in four MG-W gerbils. The primary lesions resided in the anterior segment of the eye where neural crest cells play a critical role in embryonic development. They included indistinct filtration angle, unformed canal of Schlemm, hypoplastic iris, and ciliary body. The findings noted in the retina, optic nerve, optic tract, and lateral geniculate nucleus were consistent with the lesions induced following the persistent elevation of intraocular pressure as a result of insufficient drainage of aqueous humor. Thus, the present cases observed in the eyes of MG-W gerbils exemplified the anterior segment dysmorphogenesis associated with inadequate neural crest migration or differentiation, leading to subsequent glaucoma.
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Affiliation(s)
- Yachiyo Fukunaga
- Tsukuba Research Institute, BoZo Research Center Inc., 8 Okubo, Tsukuba, Ibaraki 300-2611, Japan
| | - Tatsuya Ogawa
- Gotemba Research Institute, BoZo Research Center Inc., 1284 Kamado, Gotemba Shizuoka, 412-0039, Japan
| | - Hodaka Suzuki
- College of Agriculture, Ibaraki University, 3-21-1 Ami-machi Chuo, Inashiki-gun, Ibaraki 300-0393, Japan
| | - Yumiko Okada
- National Institute of Health Sciences, 1-18-1 Kamiyoga, Setagaya-ku, Tokyo 158-8501, Japan
| | - Tomomi Nakazawa
- Tsukuba Research Institute, BoZo Research Center Inc., 8 Okubo, Tsukuba, Ibaraki 300-2611, Japan
| | - Yuko Yamaguchi
- Gotemba Research Institute, BoZo Research Center Inc., 1284 Kamado, Gotemba Shizuoka, 412-0039, Japan
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Revealing hidden genetic diagnoses in the ocular anterior segment disorders. Genet Med 2020; 22:1623-1632. [PMID: 32499604 PMCID: PMC7521990 DOI: 10.1038/s41436-020-0854-x] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Revised: 05/19/2020] [Accepted: 05/20/2020] [Indexed: 12/27/2022] Open
Abstract
Purpose Ocular anterior segment disorders (ASDs) are clinically and genetically heterogeneous, and genetic diagnosis often remains elusive. In this study, we demonstrate the value of a combined analysis protocol using phenotypic, genomic, and pedigree structure data to achieve a genetic conclusion. Methods We utilized a combination of chromosome microarray, exome sequencing, and genome sequencing with structural variant and trio analysis to investigate a cohort of 41 predominantly sporadic cases. Results We identified likely causative variants in 54% (22/41) of cases, including 51% (19/37) of sporadic cases and 75% (3/4) of cases initially referred as familial ASD. Two-thirds of sporadic cases were found to have heterozygous variants, which in most cases were de novo. Approximately one-third (7/22) of genetic diagnoses were found in rarely reported or recently identified ASD genes including PXDN, GJA8, COL4A1, ITPR1, CPAMD8, as well as the new phenotypic association of Axenfeld–Rieger anomaly with a homozygous ADAMTS17 variant. The remainder of the variants were in key ASD genes including FOXC1, PITX2, CYP1B1, FOXE3, and PAX6. Conclusions We demonstrate the benefit of detailed phenotypic, genomic, variant, and segregation analysis to uncover some of the previously “hidden” heritable answers in several rarely reported and newly identified ocular ASD-related disease genes.
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7
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Novel PXDN biallelic variants in patients with microphthalmia and anterior segment dysgenesis. J Hum Genet 2020; 65:487-491. [PMID: 32015378 DOI: 10.1038/s10038-020-0726-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2019] [Revised: 01/08/2020] [Accepted: 01/11/2020] [Indexed: 02/06/2023]
Abstract
Microphthalmia, anophthalmia, and anterior segment dysgenesis are severe ocular developmental defects. There is a wide genetic heterogeneity leading to these ocular malformations. By using whole genome, exome and targeted sequencing in patients with ocular developmental anomalies, six biallelic pathogenic variants (including five novel variants) were identified in the PXDN gene in four families with microphthalmia and anterior segment dysgenesis. Only 11 different mutations (11 families) have been described in this gene to date. The phenotype of these patients is variable in severity, ranging from cataract and developmental glaucoma to complex microphthalmia. Interestingly, two unrelated patients of our series presented with an ocular phenotype including aniridia and microspherophakia. However, despite various phenotypic presentations and types of mutations, no genotype-phenotype correlation could be made. Thus, this work improves our knowledge of the recessive phenotype associated with biallelic variants in this gene and highlights the importance of screening PXDN in patients with anterior segment dysgenesis with or without microphthalmia.
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8
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Basement membrane collagens and disease mechanisms. Essays Biochem 2019; 63:297-312. [PMID: 31387942 PMCID: PMC6744580 DOI: 10.1042/ebc20180071] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2019] [Revised: 07/09/2019] [Accepted: 07/22/2019] [Indexed: 12/28/2022]
Abstract
Basement membranes (BMs) are specialised extracellular matrix (ECM) structures and collagens are a key component required for BM function. While collagen IV is the major BM collagen, collagens VI, VII, XV, XVII and XVIII are also present. Mutations in these collagens cause rare multi-systemic diseases but these collagens have also been associated with major common diseases including stroke. Developing treatments for these conditions will require a collective effort to increase our fundamental understanding of the biology of these collagens and the mechanisms by which mutations therein cause disease. Novel insights into pathomolecular disease mechanisms and cellular responses to these mutations has been exploited to develop proof-of-concept treatment strategies in animal models. Combined, these studies have also highlighted the complexity of the disease mechanisms and the need to obtain a more complete understanding of these mechanisms. The identification of pathomolecular mechanisms of collagen mutations shared between different disorders represent an attractive prospect for treatments that may be effective across phenotypically distinct disorders.
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9
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Liu C, Li L, Ge M, Gu L, Wang M, Zhang K, Su Y, Zhang Y, Liu C, Lan M, Yu Y, Wang T, Li Q, Zhao Y, Yu Z, Li N, Meng Q. Overexpression of miR-29 Leads to Myopathy that Resemble Pathology of Ullrich Congenital Muscular Dystrophy. Cells 2019; 8:cells8050459. [PMID: 31096686 PMCID: PMC6562860 DOI: 10.3390/cells8050459] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2019] [Revised: 05/11/2019] [Accepted: 05/13/2019] [Indexed: 12/17/2022] Open
Abstract
Ullrich congenital muscular dystrophy (UCMD) bring heavy burden to patients’ families and society. Because the incidence of this disease is very low, studies in patients are extremely limited. Animal models of this disease are indispensable. UCMD belongs to extracellular matrix-related diseases. However, the disease models constructed by knocking out some pathogenic genes of human, such as the Col6a1, Col6a2, or Col6a3 gene, of mice could not mimic UCMD. The purpose of this study is to construct a mouse model which can resemble the pathology of UCMD. miR-29 is closely related to extracellular matrix deposition of tissues and organs. To address this issue, we developed a mouse model for overexpression miR-29 using Tet-on system. In the muscle-specific miR-29ab1 cluster transgenic mice model, we found that mice exhibited dyskinesia, dyspnea, and spinal anomaly. The skeletal muscle was damaged and regenerated. At the same time, we clarify the molecular mechanism of the role of miR-29 in this process. Different from human, Col4a1 and Col4a2, target genes of miR-29, are the key pathogenic genes associating with these phenotypes. This mouse model simulates the human clinical and pathological characteristics of UCMD patients and is helpful for the subsequent research and treatment of UCMD.
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Affiliation(s)
- Chuncheng Liu
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Biological Science, China Agricultural University, Beijing 100193, China.
- The State Key Laboratory for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing 100193, China.
- The Institute of Bioengineering and Technology, Inner Mongolia University of Science and Technology, Baotou 014010, China.
| | - Lei Li
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Biological Science, China Agricultural University, Beijing 100193, China.
- The State Key Laboratory for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing 100193, China.
| | - Mengxu Ge
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Biological Science, China Agricultural University, Beijing 100193, China.
- The State Key Laboratory for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing 100193, China.
| | - Lijie Gu
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Biological Science, China Agricultural University, Beijing 100193, China.
- The State Key Laboratory for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing 100193, China.
| | - Meng Wang
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Biological Science, China Agricultural University, Beijing 100193, China.
- The State Key Laboratory for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing 100193, China.
| | - Kuo Zhang
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Biological Science, China Agricultural University, Beijing 100193, China.
- The State Key Laboratory for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing 100193, China.
| | - Yang Su
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Biological Science, China Agricultural University, Beijing 100193, China.
- The State Key Laboratory for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing 100193, China.
| | - Yuying Zhang
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Biological Science, China Agricultural University, Beijing 100193, China.
- The State Key Laboratory for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing 100193, China.
| | - Chang Liu
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Biological Science, China Agricultural University, Beijing 100193, China.
- The State Key Laboratory for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing 100193, China.
| | - Miaomiao Lan
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Biological Science, China Agricultural University, Beijing 100193, China.
- The State Key Laboratory for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing 100193, China.
| | - Yingying Yu
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Biological Science, China Agricultural University, Beijing 100193, China.
- The State Key Laboratory for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing 100193, China.
| | - Tongtong Wang
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Biological Science, China Agricultural University, Beijing 100193, China.
- The State Key Laboratory for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing 100193, China.
| | - Qiuyan Li
- The State Key Laboratory for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing 100193, China.
| | - Yaofeng Zhao
- The State Key Laboratory for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing 100193, China.
| | - Zhengquan Yu
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Biological Science, China Agricultural University, Beijing 100193, China.
- The State Key Laboratory for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing 100193, China.
| | - Ning Li
- The State Key Laboratory for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing 100193, China.
| | - Qingyong Meng
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Biological Science, China Agricultural University, Beijing 100193, China.
- The State Key Laboratory for Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing 100193, China.
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Labelle-Dumais C, Schuitema V, Hayashi G, Hoff K, Gong W, Dao DQ, Ullian EM, Oishi P, Margeta M, Gould DB. COL4A1 Mutations Cause Neuromuscular Disease with Tissue-Specific Mechanistic Heterogeneity. Am J Hum Genet 2019; 104:847-860. [PMID: 31051113 DOI: 10.1016/j.ajhg.2019.03.007] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2018] [Accepted: 03/05/2019] [Indexed: 01/18/2023] Open
Abstract
Collagen type IV alpha 1 and alpha 2 chains form heterotrimers ([α1(IV)]2α2(IV)) that represent a fundamental basement membrane constituent. Dominant COL4A1 and COL4A2 mutations cause a multisystem disorder that is marked by clinical heterogeneity and variable expressivity and that is generally characterized by the presence of cerebrovascular disease with ocular, renal, and muscular involvement. Despite the fact that muscle pathology is reported in up to one-third of individuals with COL4A1 and COL4A2 mutations and in animal models with mutations in COL4A1 and COL4A2 orthologs, the pathophysiological mechanisms underlying COL4A1-related myopathy are unknown. In general, mutations are thought to impair [α1(IV)]2α2(IV) secretion. Whether pathogenesis results from intracellular retention, extracellular deficiency, or the presence of mutant proteins in basement membranes represents an important gap in knowledge and a major obstacle for developing targeted interventions. We report that Col4a1 mutant mice develop progressive neuromuscular pathology that models human disease. We demonstrate that independent muscular, neural, and vascular insults contribute to neuromyopathy and that there is mechanistic heterogeneity among tissues. Importantly, we provide evidence of a COL4A1 functional subdomain with disproportionate significance for tissue-specific pathology and demonstrate that a potential therapeutic strategy aimed at promoting [α1(IV)]2α2(IV) secretion can ameliorate or exacerbate myopathy in a mutation-dependent manner. These data have important translational implications for prediction of clinical outcomes based on genotype, development of mechanism-based interventions, and genetic stratification for clinical trials. Collectively, our data underscore the importance of the [α1(IV)]2α2(IV) network as a multifunctional signaling platform and show that allelic and tissue-specific mechanistic heterogeneities contribute to the variable expressivity of COL4A1 and COL4A2 mutations.
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Jones FE, Murray LS, McNeilly S, Dean A, Aman A, Lu Y, Nikolova N, Malomgré R, Horsburgh K, Holmes WM, Kadler KE, Van Agtmael T. 4-Sodium phenyl butyric acid has both efficacy and counter-indicative effects in the treatment of Col4a1 disease. Hum Mol Genet 2019; 28:628-638. [PMID: 30351356 PMCID: PMC6360271 DOI: 10.1093/hmg/ddy369] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2018] [Accepted: 10/11/2018] [Indexed: 12/22/2022] Open
Abstract
Mutations in the collagen genes COL4A1 and COL4A2 cause Mendelian eye, kidney and cerebrovascular disease including intracerebral haemorrhage (ICH), and common collagen IV variants are a risk factor for sporadic ICH. COL4A1 and COL4A2 mutations cause endoplasmic reticulum (ER) stress and basement membrane (BM) defects, and recent data suggest an association of ER stress with ICH due to a COL4A2 mutation. However, the potential of ER stress as a therapeutic target for the multi-systemic COL4A1 pathologies remains unclear. We performed a preventative oral treatment of Col4a1 mutant mice with the chemical chaperone phenyl butyric acid (PBA), which reduced adult ICH. Importantly, treatment of adult mice with the established disease also reduced ICH. However, PBA treatment did not alter eye and kidney defects, establishing tissue-specific outcomes of targeting Col4a1-derived ER stress, and therefore this treatment may not be applicable for patients with eye and renal disease. While PBA treatment reduced ER stress and increased collagen IV incorporation into BMs, the persistence of defects in BM structure and reduced ability of the BM to withstand mechanical stress indicate that PBA may be counter-indicative for pathologies caused by matrix defects. These data establish that treatment for COL4A1 disease requires a multipronged treatment approach that restores both ER homeostasis and matrix defects. Alleviating ER stress is a valid therapeutic target for preventing and treating established adult ICH, but collagen IV patients will require stratification based on their clinical presentation and mechanism of their mutations.
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Affiliation(s)
- Frances E Jones
- Institute of Cardiovascular and Medical Sciences, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, UK
| | - Lydia S Murray
- Institute of Cardiovascular and Medical Sciences, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, UK
| | - Sarah McNeilly
- Institute of Cardiovascular and Medical Sciences, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, UK
| | - Afshan Dean
- Institute of Cardiovascular and Medical Sciences, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, UK
| | - Alisha Aman
- Institute of Cardiovascular and Medical Sciences, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, UK
| | - Yinhui Lu
- Wellcome Centre for Cell-Matrix Research, Faculty of Biology, Medicine & Health, University of Manchester, Manchester, UK
| | - Nija Nikolova
- Institute of Cardiovascular and Medical Sciences, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, UK
| | - Ruben Malomgré
- Institute of Cardiovascular and Medical Sciences, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, UK
| | - Karen Horsburgh
- Centre for Discovery Brain Sciences, Medical School, University of Edinburgh, Edinburgh, UK
| | - William M Holmes
- Institute of Neuroscience and Psychology, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, UK
| | - Karl E Kadler
- Wellcome Centre for Cell-Matrix Research, Faculty of Biology, Medicine & Health, University of Manchester, Manchester, UK
| | - Tom Van Agtmael
- Institute of Cardiovascular and Medical Sciences, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, UK
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Abstract
This article discusses the clinical appearance, differential diagnoses, and treatment considerations of corneal disease in the most common domesticated species of rodent: mouse, rat, chinchilla, and guinea pig. Many corneal diseases are related to inbred strains of either research or pet rodents. Diseases are complicated by husbandry and treatment-related challenges in this small, social species. This article is broken down by species, first discussing normal anatomy, then discussing commonly encountered diseases, and concluding with treatment considerations.
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Affiliation(s)
- Caroline Monk
- Ophthalmology, BluePearl Veterinary Partners, 1071 Howell Mill Road Northwest, Atlanta, GA 30318, USA.
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Phenotype–genotype correlations and emerging pathways in ocular anterior segment dysgenesis. Hum Genet 2018; 138:899-915. [DOI: 10.1007/s00439-018-1935-7] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2018] [Accepted: 09/10/2018] [Indexed: 12/11/2022]
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