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Opa1 deficiency in a mouse model of autosomal dominant optic atrophy impairs mitochondrial morphology, optic nerve structure and visual function
Open accessAbstract
OPA1 is a ubiquitously expressed, nuclear dynamin-related GTPase, targeted to the inner mitochondrial membrane, which plays a role in mitochondrial fusion. Mutations in the OPA1 gene on chromosome 3q28-qter are associated with autosomal dominant optic atrophy (ADOA), the most common inherited optic neuropathy, in which retinal ganglion cells (RGCs) are lost and visual acuity is impaired from an early age. We have generated a novel ENU-induced mutant mouse carrying a protein-truncating nonsense mutation in opa1 in order to explore the pathophysiology of ADOA. The heterozygous mutation, B6; C3-Opa1(Q285STOP), located in exon 8 immediately before the central dynamin-GTPase, leads to approximately 50% reduction in opa1 protein in retina and all tissues on western analysis. The homozygous mutation is embryonic lethal by 13.5 days post coitum, demonstrating the importance of Opa1 during early development. Fibroblasts taken from adult heterozygous mutant mice show an apparent alteration in morphology, with an increase in mitochondrial fission and fragmentation. Heterozygous mutants show a slow onset of degeneration in the optic nerve electron microscopy. Furthermore, they demonstrate a functional reduction in visual function on testing with the optokinetic drum and the circadian running wheel. These findings indicate that the opa1 GTPase contains crucial information required for the survival of RGCs and that Opa1 is essential for early embryonic survival. The Opa1 +/- mice described here provide a means to directly investigate the cellular pathophysiology of OPA1 ADOA.
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“The full knockout mice of either Mfn1, Mfn2, or OPA1 result in embryonic lethality of mice, demonstrating the biological importance of mitochondrial fusion in early development [60, 178].”
From The connection between the dynamic remodeling of the mitochondrial network and the regulation of muscle mass (2021) · cites this paper as [178]
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“These proteins include pro-fusion GTPases: mitofusin (Mfn) 1 and 2; and pro-fission GTPases: dynamin related protein 1 (Drp1) and Fis 1 (17,23).”
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Self-citationOPA1 requires mitofusin 1 to promote mitochondrial fusion
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Metadata
- Authors
- Davies, V. J., Hollins, A. J., Piechota, M. J., Yip, W., Davies, J. R., White, K. E., Nicols, P. P., Boulton, M. E., & Votruba, M.
- Affiliations
- Cardiff University (GB)
- Newcastle University (GB)
- The University of Texas Medical Branch at Galveston (US)
- University Hospital of Wales (GB)
- Corresponding author
- Votruba, Marcela
- ORCID
- Venue
- Human Molecular Genetics
- Publisher
- Oxford University Press (OUP)
- Published
- 2007-04-11
- Volume
- 16
- Issue
- 11
- Pages
- 1307-1318
- ISSN
- 0964-6906 (ISSN-L)
- 1460-2083
- OpenAlex
- W2161437961
- Cited by
- 449
- References
- 53
- Citations by year
- 2026: 7 · 2025: 18 · 2024: 20 · 2023: 25 · 2022: 16 · 2021: 40 · 2020: 34 · 2019: 20 · 2018: 17 · 2017: 27 · 2016: 21 · 2015: 31 · 2014: 17 · 2013: 17 · 2012: 34
- FWCI
- 10.49
- Type
- journal article
- Language
- en
- Open access
- green
- doi.org
- Locations
- Human Molecular Genetics (publishedVersion)
- PubMed (publishedVersion)
- Explore Bristol Research (submittedVersion)
- Newcastle University ePrints (Newcastle Univesity)
- Funders
- University of North Texas
- Cardiff University
- Medical Research Council (G108523)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
- Health Sciences › Medicine › Ophthalmology › Glaucoma and retinal disorders
- Health Sciences › Medicine › Ophthalmology › Retinal Development and Disorders
- Keywords
- OPA1, autosomal dominant optic atrophy, mitochondrial fusion, mitochondrial fission, mitochondrial morphology, retinal ganglion cells, optic nerve degeneration, visual function, embryonic lethality, dynamin-related GTPase, inherited optic neuropathy
- MeSH terms
- Animals, Base Sequence, Cells, Cultured, Male, Mice, Inbred C3H, Mitochondria, Molecular Sequence Data, Optic Nerve, Vision, Ocular, Amino Acid Substitution, GTP Phosphohydrolases, Optic Atrophy, Autosomal Dominant, Mice
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