Our long-term goal is to develop genetic approaches that could be used for the treatment of mitochondrial disorders associated with mitochondrial DNA (mtDNA) mutations. We propose to develop methods that improve oxidative phosphorylation function in cells harboring heteroplasmic mtDNA mutations (i.e. a mixture of wild-type and mutated mtDNA). Our approach is based on the mtDNA heteroplasmy shift concept, where, by genetic manipulation, the levels of the mutated genome are decreased in relation to the wild-type genome, thereby improving cellular health. In the previous funding period we showed that mitochondria-targeted restriction endonucleases are powerful tools to achieve mtDNA heteroplasmy shift. The present proposal will further expand this approach to any mtDNA mutation. To do so, we will take advantage of new developments in the field of designed nucleases. TAL-effector nucleases have emerged as highly flexible molecules that can recognize DNA regions based on a modular arrangement of their DNA binding domains. We have obtained preliminary data showing that this approach is feasible and propose to better characterize the system in vitro, ex vivo and in vivo.

Public Health Relevance

We propose to use mitochondrial-targeted designer nucleases to eliminate the mutated mitochondrial genome in cells harboring a mixture of mutated and wild-type mitochondrial DNA. This change would lead to a correction of biochemical defects with a potential curative outcome in certain patients.

Agency
National Institute of Health (NIH)
Institute
National Eye Institute (NEI)
Type
Research Project (R01)
Project #
5R01EY010804-20
Application #
8926991
Study Section
Therapeutic Approaches to Genetic Diseases Study Section (TAG)
Program Officer
Araj, Houmam H
Project Start
1994-12-01
Project End
2016-08-31
Budget Start
2015-09-01
Budget End
2016-08-31
Support Year
20
Fiscal Year
2015
Total Cost
Indirect Cost
Name
University of Miami School of Medicine
Department
Neurology
Type
Schools of Medicine
DUNS #
052780918
City
Coral Gables
State
FL
Country
United States
Zip Code
33146
Nissanka, Nadee; Moraes, Carlos T (2018) Mitochondrial DNA damage and reactive oxygen species in neurodegenerative disease. FEBS Lett 592:728-742
Pinto, Milena; Nissanka, Nadee; Moraes, Carlos T (2018) Lack of Parkin Anticipates the Phenotype and Affects Mitochondrial Morphology and mtDNA Levels in a Mouse Model of Parkinson's Disease. J Neurosci 38:1042-1053
Peralta, Susana; Goffart, Steffi; Williams, Sion L et al. (2018) ATAD3 controls mitochondrial cristae structure in mouse muscle, influencing mtDNA replication and cholesterol levels. J Cell Sci 131:
Garcia, Sofia; Nissanka, Nadee; Mareco, Edson A et al. (2018) Overexpression of PGC-1? in aging muscle enhances a subset of young-like molecular patterns. Aging Cell 17:
Arguello, Tania; Köhrer, Caroline; RajBhandary, Uttam L et al. (2018) Mitochondrial methionyl N-formylation affects steady-state levels of oxidative phosphorylation complexes and their organization into supercomplexes. J Biol Chem 293:15021-15032
Madsen, Pernille M; Pinto, Milena; Patel, Shreyans et al. (2017) Mitochondrial DNA Double-Strand Breaks in Oligodendrocytes Cause Demyelination, Axonal Injury, and CNS Inflammation. J Neurosci 37:10185-10199
Pinto, Milena; Pickrell, Alicia M; Wang, Xiao et al. (2017) Transient mitochondrial DNA double strand breaks in mice cause accelerated aging phenotypes in a ROS-dependent but p53/p21-independent manner. Cell Death Differ 24:288-299
Tengan, Celia H; Moraes, Carlos T (2017) NO control of mitochondrial function in normal and transformed cells. Biochim Biophys Acta Bioenerg 1858:573-581
Pinto, Milena; Nissanka, Nadee; Peralta, Susana et al. (2016) Pioglitazone ameliorates the phenotype of a novel Parkinson's disease mouse model by reducing neuroinflammation. Mol Neurodegener 11:25
Luo, Xueting; Ribeiro, Marcio; Bray, Eric R et al. (2016) Enhanced Transcriptional Activity and Mitochondrial Localization of STAT3 Co-induce Axon Regrowth in the Adult Central Nervous System. Cell Rep 15:398-410

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