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Fu M, Duan S, Zhang X, Wang J, Wang S, Chi ZL. A Novel Heterozygous TGFBI c.1613C>A Pathogenic Variant is Associated With Lattice Corneal Dystrophy in a Chinese Family. Am J Ophthalmol 2023; 256:138-145. [PMID: 37567434 DOI: 10.1016/j.ajo.2023.08.005] [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: 02/15/2023] [Revised: 08/02/2023] [Accepted: 08/03/2023] [Indexed: 08/13/2023]
Abstract
PURPOSE To investigate the gene mutations and relationship of clinical manifestation in a Chinese family with familial lattice corneal dystrophy (LCD). DESIGN Single-family case-control study. METHODS A family with familial LCD was recruited for this study. A total of 10 affected and 13 healthy family members participated in this research. Clinical features were examined by slit-lamp examination and anterior segment optical coherence tomography (AS-OCT). Peripheral blood samples were collected from each participant, and genomic DNA was extracted. Whole-exome sequencing (WES) analysis was performed, and the pathogenic variants of LCD were identified using bioinformatics tools and confirmed by Sanger sequencing. RESULTS Slit-lamp examination revealed diffuse grayish-white punctate, linear, and "lattice-like" opacities in the corneal epithelium and superficial corneal stroma. AS-OCT revealed an irregularly shaped cornea. The corneal epithelium and anterior corneal stroma showed high-reflective deposits and bulges. The clinical appearance of the patients fit the pattern and features of autosomal dominant inheritance of LCD type I (LCD I). A novel pathogenic variant of exon 12 in TGFBI was found by WES analysis, in which cytosine at position 1613 was substituted by adenine (c.1613C>A), and the amino acid was changed from threonine to lysine (p.T538K). Mutated genes and proteins were predicted to be deleterious. CONCLUSION A novel heterozygous pathogenic variant (c.1613C>A) of TGFBI was identified in the Chinese family with LCD I.
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Affiliation(s)
- Mengjun Fu
- From the State Key Laboratory of Ophthalmology (M.F., X.Z., Z-L.C.), Optometry and Visual Science, Eye Hospital, Wenzhou Medical University, Wenzhou, China; National Clinical Research Center for Ocular Diseases (M.F., X.Z., Z-L.C.), Eye Hospital, Wenzhou Medical University, Wenzhou, China; Weifang Eye Institute (M.F., J.W., S.W.), National Key Clinical Specialty, Weifang Eye Hospital, Zhengda Guangming Eye Group, Weifang, China
| | - Shan Duan
- Laboratory of Molecular Medicine (S.D.), Institute of Maternal and Child Medicine, Shenzhen Maternity and Child Healthcare Hospital, Southern Medical University, Shenzhen, China
| | - Xiaobo Zhang
- From the State Key Laboratory of Ophthalmology (M.F., X.Z., Z-L.C.), Optometry and Visual Science, Eye Hospital, Wenzhou Medical University, Wenzhou, China; National Clinical Research Center for Ocular Diseases (M.F., X.Z., Z-L.C.), Eye Hospital, Wenzhou Medical University, Wenzhou, China
| | - Jiahao Wang
- Weifang Eye Institute (M.F., J.W., S.W.), National Key Clinical Specialty, Weifang Eye Hospital, Zhengda Guangming Eye Group, Weifang, China
| | - Sheng Wang
- Weifang Eye Institute (M.F., J.W., S.W.), National Key Clinical Specialty, Weifang Eye Hospital, Zhengda Guangming Eye Group, Weifang, China
| | - Zai-Long Chi
- From the State Key Laboratory of Ophthalmology (M.F., X.Z., Z-L.C.), Optometry and Visual Science, Eye Hospital, Wenzhou Medical University, Wenzhou, China; National Clinical Research Center for Ocular Diseases (M.F., X.Z., Z-L.C.), Eye Hospital, Wenzhou Medical University, Wenzhou, China.
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Han J, Zhang M, Lin HY, Huang FY, Lin YY, Tan GH, Zheng ZY. Impaired Autophagic Degradation of Transforming Growth Factor-β-Induced Protein by Macrophages in Lattice Corneal Dystrophy. Invest Ophthalmol Vis Sci 2019; 60:978-989. [PMID: 30884524 DOI: 10.1167/iovs.18-25838] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Purpose Lattice corneal dystrophy (LCD) is related to the denaturation of transforming growth factor-β-induced protein (TGFBIp). Autophagic degradation of the denatured proteins by macrophages is one pathway to remove the denatured proteins. Thus, we investigated the role of autophagy in the degradation of mutant (MU) TGFBIp in macrophages. Methods Corneas from participants were observed by slit-lamp photography and subjected to histopathologic and genetic analysis. Wild-type (WT) and MU TGFBIp were recombined and expressed. Macrophages from MU participants were isolated and cocultured with the recombinant TGFBIp. Colocalization of the two molecules was observed by immunofluorescent microscopy. Enzyme-linked immunosorbent assay, Western blotting, and flow cytometry were used to detect changes in molecule expression related to the phenotype and autophagy process. Results Fourteen members from a family of 25 were identified as LCD sufferers. Significant TGFBIp aggregates and macrophage infiltration were found only in the corneas of LCD sufferers. Marker accumulation of TGFBIp was found in macrophages exposed to MU TGFBIp even at 5 hours after MU TGFBIp was withdrawn. High expressions of CD68 and CD36 were found in macrophages exposed to WT TGFBIp, but not to MU TGFBIp. Impaired autophagic flux due to defective autophagosome fusion to lysosomes was found in macrophages exposed to MU TGFBIp. Blockage of the autophagic process suppressed the expression of CD68 and CD36 in macrophages exposed to WT TGFBIp to levels similar to those found in macrophages exposed to MU TGFBIp. Conclusions Our results suggested that reversion of the defective autophagic process in macrophages may be a therapeutic strategy for patients with LCD.
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Affiliation(s)
- Ji Han
- Hainan Provincial Key Laboratory of Tropical Medicine, Hainan Medical College, Haikou, China.,Department of Ophthalmology, The First Affiliated Hospital of Hainan Medical College, Haikou, China
| | - Ming Zhang
- Hainan Provincial Key Laboratory of Tropical Medicine, Hainan Medical College, Haikou, China
| | - Hai-Yan Lin
- Hainan Provincial Key Laboratory of Tropical Medicine, Hainan Medical College, Haikou, China
| | - Feng-Ying Huang
- Hainan Provincial Key Laboratory of Tropical Medicine, Hainan Medical College, Haikou, China
| | - Ying-Ying Lin
- Hainan Provincial Key Laboratory of Tropical Medicine, Hainan Medical College, Haikou, China
| | - Guang-Hong Tan
- Hainan Provincial Key Laboratory of Tropical Medicine, Hainan Medical College, Haikou, China
| | - Zhen-You Zheng
- Hainan Provincial Key Laboratory of Tropical Medicine, Hainan Medical College, Haikou, China.,Department of Ophthalmology, The First Affiliated Hospital of Hainan Medical College, Haikou, China
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