Cited by 449Mitochondrial Function and PathologyGlaucoma and retinal disordersRetinal Development and Disorders

Opa1 deficiency in a mouse model of autosomal dominant optic atrophy impairs mitochondrial morphology, optic nerve structure and visual function

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Davies, Vanessa J., Hollins, Andrew J., Piechota, Malgorzata J., Yip, Wanfen, Davies, Jennifer R., White, Kathryn E., Nicols, Phillip P., Boulton, Michael E. +1 more·2007·Human Molecular Genetics

Abstract

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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Crossref · 10.1093/hmg/ddm079

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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
Venue
Human Molecular Genetics
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
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
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › 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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