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Zhang J, Jing M, Li P, Sun L, Pi X, Jiang N, Zhu KK, Li H, Li J, Wang M, Zhang J, Liu M, Mu H, Hu Y, Cui X. Knockout of DLIC1 leads to retinal cone degeneration via disturbing Rab8 transport in zebrafish. Biochim Biophys Acta Mol Basis Dis 2023; 1869:166645. [PMID: 36682603 DOI: 10.1016/j.bbadis.2023.166645] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Revised: 12/28/2022] [Accepted: 01/13/2023] [Indexed: 01/21/2023]
Abstract
Retinal photoreceptors execute phototransduction functions and require an efficient system for the transport of materials (e.g. proteins and lipids) from inner segments to outer segments. Cytoplasmic dynein 1 is a minus-end-directed microtubule motor and participates in cargo transport in the cytoplasm. However, the roles of dynein 1 motor in photoreceptor cargo transport and retinal development are still ambiguous. In our present study, the light intermediate chain protein DLIC1 (encoded by dync1li1), links activating adaptors to bind diverse cargos in the dynein 1 motor, was depleted using CRISPR-Cas9 technology in zebrafish. The dync1li1-/- zebrafish displayed progressive degeneration of retinal cone photoreceptors, especially blue cones. The retinal rods were not affected in dync1li1-/- zebrafish. Knockout of DLIC1 resulted in abnormal expression and localization of cone opsins in dync1li1-/- retinas. TUNEL staining suggested that apoptosis was induced after aberrant accumulation of cone opsins in photoreceptors of dync1li1-/- zebrafish. Instead of Rab11 transport, Rab8 transport was disturbed in dync1li1-/- retinas. Our data demonstrate that DLIC1 is required for function maintenance and survival of cone photoreceptors, and hint at an essential role of the cytoplasmic dynein 1 motor in photoreceptor cargo transport.
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Affiliation(s)
- Jing Zhang
- Joint National Laboratory for Antibody Drug Engineering, The First Affiliated Hospital, School of Medicine, Henan University, Kaifeng, China
| | - Min Jing
- Joint National Laboratory for Antibody Drug Engineering, The First Affiliated Hospital, School of Medicine, Henan University, Kaifeng, China
| | - Ping Li
- Joint National Laboratory for Antibody Drug Engineering, The First Affiliated Hospital, School of Medicine, Henan University, Kaifeng, China
| | - Luqian Sun
- Joint National Laboratory for Antibody Drug Engineering, The First Affiliated Hospital, School of Medicine, Henan University, Kaifeng, China
| | - Xiahui Pi
- Joint National Laboratory for Antibody Drug Engineering, The First Affiliated Hospital, School of Medicine, Henan University, Kaifeng, China
| | - Ning Jiang
- Joint National Laboratory for Antibody Drug Engineering, The First Affiliated Hospital, School of Medicine, Henan University, Kaifeng, China
| | - Ke-Ke Zhu
- Kaifeng Key Lab of Myopia and Cataract, Kaifeng Central Hospital, Kaifeng, China
| | - Hui Li
- Joint National Laboratory for Antibody Drug Engineering, The First Affiliated Hospital, School of Medicine, Henan University, Kaifeng, China
| | - Jing Li
- Joint National Laboratory for Antibody Drug Engineering, The First Affiliated Hospital, School of Medicine, Henan University, Kaifeng, China
| | - Mingli Wang
- Joint National Laboratory for Antibody Drug Engineering, The First Affiliated Hospital, School of Medicine, Henan University, Kaifeng, China
| | - Jun Zhang
- Joint National Laboratory for Antibody Drug Engineering, The First Affiliated Hospital, School of Medicine, Henan University, Kaifeng, China
| | - Mugen Liu
- College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, China
| | - Hongmei Mu
- Kaifeng Key Lab of Myopia and Cataract, Kaifeng Central Hospital, Kaifeng, China.
| | - Yanzhong Hu
- Joint National Laboratory for Antibody Drug Engineering, The First Affiliated Hospital, School of Medicine, Henan University, Kaifeng, China; Department of Ophthalmology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China.
| | - Xiukun Cui
- Joint National Laboratory for Antibody Drug Engineering, The First Affiliated Hospital, School of Medicine, Henan University, Kaifeng, China.
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Cui XK, Zhu KK, Zhou Z, Wan SM, Dong Y, Wang XC, Li J, Zhang J, Mu HM, Qin L, Hu YZ. A novel frameshift mutation in CX46 associated with hereditary dominant cataracts in a Chinese family. Int J Ophthalmol 2017; 10:684-690. [PMID: 28546921 DOI: 10.18240/ijo.2017.05.04] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2016] [Accepted: 02/23/2017] [Indexed: 12/20/2022] Open
Abstract
AIM To investigate the genetic mutations that are associated the hereditary autosomal dominant cataract in a Chinese family. METHODS A Chinese family consisting of 20 cataract patients (including 9 male and 11 female) and 2 unaffected individuals from 5 generations were diagnosed to be a typical autosomal dominant cataract pedigree. Genomic DNA samples were extracted from the peripheral blood cells of the participants in this pedigree. Exon sequence was used for genetic mutation screening. In silico analysis was used to study the structure characteristics of connexin 46 (CX46) mutant. Immunoblotting was conduceted for testing the expression of CX46. RESULTS To determine the involved genetic mutations, 11 well-known cataract-associated genes (cryaa, cryab, crybb1, crybb2, crygc, crygd, Gja3, Gja8, Hsf4, Mip and Pitx3) were chosen for genetic mutation test by using exon sequencing. A novel cytosine insertion at position 1195 of CX46 cDNA (c.1194_1195ins C) was found in the samples of 5 tested cataract patients but not in the unaffected 2 individuals nor in normal controls, which resulted in 30 amino acids more extension in CX46C-terminus (cx46fs400) compared with the wild-type CX46. In silico protein structure analysis indicated that the mutant showed distinctive hydrophobicity and protein secondary structure compared with the wild-type CX46. The immunoblot results revealed that CX46 protein, which expressed in the aging cataract lens tissues, was absence in the proband lens. In contrast, CX50, alpha A-crystallin and alphaB-crystallin expressed equally in both proband and aging cataract tissues. Those results revealed that the cx46fs400 mutation could impair CX46 protein expression. CONCLUSION The insertion of cytosine at position 1195 of CX46 cDNA is a novel mutation site that is associated with the autosomal dominant cataracts in this Chinese family. The C-terminal frameshift mutation is involved in regulating CX46 protein expression.
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Affiliation(s)
- Xiu-Kun Cui
- Henan International Union Laboratory of Antibody Medicine, Department of Cell biology and Genetics, Henan University School of Medicine, Kaifeng 475004, Henan Province, China
| | - Ke-Ke Zhu
- Kaifeng Key Lab of Cataract and Myopia, Institute of Eye Diseases, Kaifeng Centre Hospital, Kaifeng 475000, Henan Province, China
| | - Zheng Zhou
- Henan International Union Laboratory of Antibody Medicine, Department of Cell biology and Genetics, Henan University School of Medicine, Kaifeng 475004, Henan Province, China
| | - Si-Min Wan
- Henan International Union Laboratory of Antibody Medicine, Department of Cell biology and Genetics, Henan University School of Medicine, Kaifeng 475004, Henan Province, China
| | - Yi Dong
- Henan International Union Laboratory of Antibody Medicine, Department of Cell biology and Genetics, Henan University School of Medicine, Kaifeng 475004, Henan Province, China
| | - Xuan-Ce Wang
- Henan International Union Laboratory of Antibody Medicine, Department of Cell biology and Genetics, Henan University School of Medicine, Kaifeng 475004, Henan Province, China
| | - Jing Li
- Henan International Union Laboratory of Antibody Medicine, Department of Cell biology and Genetics, Henan University School of Medicine, Kaifeng 475004, Henan Province, China
| | - Jing Zhang
- Henan International Union Laboratory of Antibody Medicine, Department of Cell biology and Genetics, Henan University School of Medicine, Kaifeng 475004, Henan Province, China
| | - Hong-Mei Mu
- Kaifeng Key Lab of Cataract and Myopia, Institute of Eye Diseases, Kaifeng Centre Hospital, Kaifeng 475000, Henan Province, China
| | - Lei Qin
- Department of Cardiovascular Medicine, Kaifeng Centre Hospital, Kaifeng 475000, Henan Province, China
| | - Yan-Zhong Hu
- Henan International Union Laboratory of Antibody Medicine, Department of Cell biology and Genetics, Henan University School of Medicine, Kaifeng 475004, Henan Province, China
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