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Mitochondrial oxidative phosphorylation compensation may preserve vision in patients with OPA1-linked autosomal dominant optic atrophy
Citation
Van Bergen, NJ and Crowston, JG and Kearns, LS and Staffieri, SE and Hewitt, A and Cohn, AC and Mackey, DA and Trounce, IA, Mitochondrial oxidative phosphorylation compensation may preserve vision in patients with OPA1-linked autosomal dominant optic atrophy, PL o S One, 6, (6) Article e21347. ISSN 1932-6203 (2011) [Refereed Article]
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Copyright Statement
Licensed under Creative Commons Attribution 2.5 Generic (CC BY 2.5) http://creativecommons.org/licenses/by/2.5/
DOI: doi:10.1371/journal.pone.0021347
Abstract
Autosomal Dominant Optic Atrophy (ADOA) is the most common inherited optic atrophy where vision impairment results from specific loss of retinal ganglion cells of the optic nerve. Around 60% of ADOA cases are linked to mutations in the OPA1 gene. OPA1 is a fission-fusion protein involved in mitochondrial inner membrane remodelling. ADOA presents with marked variation in clinical phenotype and varying degrees of vision loss, even among siblings carrying identical mutations in OPA1. To determine whether the degree of vision loss is associated with the level of mitochondrial impairment, we examined mitochondrial function in lymphoblast cell lines obtained from six large Australian OPA1-linked ADOA pedigrees. Comparing patients with severe vision loss (visual acuity [VA]<6/36) and patients with relatively preserved vision (VA>6/9) a clear defect in mitochondrial ATP synthesis and reduced respiration rates were observed in patients with poor vision. In addition, oxidative phosphorylation (OXPHOS) enzymology in ADOA patients with normal vision revealed increased complex II+III activity and levels of complex IV protein. These data suggest that OPA1 deficiency impairs OXPHOS efficiency, but compensation through increases in the distal complexes of the respiratory chain may preserve mitochondrial ATP production in patients who maintain normal vision. Identification of genetic variants that enable this response may provide novel therapeutic insights into OXPHOS compensation for preventing vision loss in optic neuropathies.
Item Details
| Item Type: | Refereed Article |
|---|---|
| Research Division: | Medical and Health Sciences |
| Research Group: | Ophthalmology and Optometry |
| Research Field: | Ophthalmology |
| Objective Division: | Health |
| Objective Group: | Clinical Health (Organs, Diseases and Abnormal Conditions) |
| Objective Field: | Hearing, Vision, Speech and Their Disorders |
| Author: | Hewitt, A (Professor Alex Hewitt) |
| Author: | Mackey, DA (Professor David Mackey) |
| ID Code: | 95382 |
| Year Published: | 2011 |
| Web of Science® Times Cited: | 27 |
| Deposited By: | Medicine |
| Deposited On: | 2014-09-30 |
| Last Modified: | 2017-11-07 |
| Downloads: | 363 View Download Statistics |
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