Abstract
Defects in mitochondrial energetics result in several retinal diseases, providing unresolved clues to why some retinal neurons are specifically affected by mitochondrial dysfunction. The central mitochondrial pathway of energy generation—oxidative phosphorylation—presents unique challenges for unravelling the genetic and molecular mechanisms of neuronal susceptibility to energetic failure. This is due to the chimeric assembly of the constituent enzyme complexes from subunits encoded by both the mitochondrial (mt) DNA and nuclear genome. Stem cell modelling of mtDNA and nuclear gene-linked retinal disease hold great promise to advance this understanding, while at the same time providing new therapeutic insights. This unique genetics also has profound implications for stem cell biology. Recent discoveries place regulation of oxidative phosphorylation at the centre of cellular differentiation signalling. These evolving concepts are reviewed here, from oxidative phosphorylation and retinal disease consequences of energetic failure; to mitochondria in stem cells, differentiation, and epigenetic modulation of nuclear gene expression.
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Abbreviations
- ADOA:
-
Autosomal dominant optic atrophy
- AMD:
-
Age-related macular degeneration
- ATP:
-
Adenosine triphosphate
- CMT:
-
Charcot–Marie–Tooth
- CPEO:
-
Chronic progressive external ophthalmoplegia
- ESCs:
-
Embryonic stem cells
- GWAS:
-
Genome wide association studies
- iPSCs:
-
Induced pluripotent stem cells
- KSS:
-
Kearns–Sayre syndrome
- LHON:
-
Leber hereditary optic neuropathy
- MELAS:
-
Mitochondrial encephalopathy lactic acidosis and stroke-like episodes
- mtDNA:
-
Mitochondrial DNA
- NAD:
-
Nicotinamide adenine dinucleotide (oxidised)
- NADH:
-
Nicotinamide adenine dinucleotide (reduced)
- NARP:
-
Neurogenic atrophy and retinitis pigmentosa syndrome
- OXPHOS:
-
Oxidative phosphorylation
- POAG:
-
Primary open angle glaucoma
- RGCs:
-
Retinal ganglion cells
- RPE:
-
Retinal pigment epithelium
- TIM:
-
Translocase of the inner membrane
- TOM:
-
Translocase of the outer membrane
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Trounce, I.A. (2014). Mitochondria in Retinal Neurodegeneration and Stem Cell Models. In: PĂ©bay, A. (eds) Regenerative Biology of the Eye. Stem Cell Biology and Regenerative Medicine. Springer, New York, NY. https://doi.org/10.1007/978-1-4939-0787-8_2
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