Overexpression of twinkle-helicase protects cardiomyocytes from genotoxic stress caused by reactive oxygen species
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Mitochondrial DNA (mtDNA) in adult human heart is characterized by complex molecular forms held together by junctional molecules of unknown biological significance. These junctions are not present in mouse hearts and emerge in humans during postnatal development, concomitant with increased demand for oxidative metabolism. To analyze the role of mtDNA organization during oxidative stress in cardiomyocytes, we used a mouse model, which recapitulates the complex mtDNA organization of human hearts by overexpression of the mitochondrial helicase, TWINKLE. Overexpression of TWINKLE rescued the oxidative damage induced replication stalling of mtDNA, reduced mtDNA point mutation load, and modified mtDNA rearrangements in heterozygous mitochondrial superoxide dismutase knockout hearts, as well as ameliorated cardiomyopathy in mice superoxide dismutase knockout in a p21-dependent manner. We conclude that mtDNA integrity influences cell survival and reason that tissue specific modes of mtDNA maintenance represent an adaptation to oxidative stress.
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Crossing the MnSOD+/− mouse with the systemic Twinkle overexpression mouse abolishes the MnSOD+/− phenotype.
“Crossing the MnSOD+/− mouse with the systemic Twinkle overexpression mouse abolishes the MnSOD+/− phenotype (Pohjoismaki et al., 2013).”
From Role of the mitochondrial DNA replication machinery in mitochondrial DNA mutagenesis, aging and age-related diseases (2017) · cites this paper as Pohjoismaki et al., 2013
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- Authors
- Pohjoismäki, J. L. O., Williams, S. L., Boettger, T., Goffart, S., Kim, J., Suomalainen, A., Moraes, C. T., & Braun, T.
- Affiliations
- University of Eastern Finland (FI)
- University of Miami (US)
- Max Planck Institute for Heart and Lung Research (DE)
- University of Helsinki (FI)
- ORCID
- Venue
- Proceedings of the National Academy of Sciences
- Publisher
- National Academy of Sciences
- Published
- 2013-11-11
- Volume
- 110
- Issue
- 48
- Pages
- 19408-19413
- ISSN
- 0027-8424 (ISSN-L)
- 1091-6490
- PMC
- PMC3845095
- OpenAlex
- W1993968187
- Cited by
- 45
- References
- 46
- Citations by year
- 2026: 2 · 2025: 3 · 2024: 2 · 2022: 4 · 2021: 3 · 2020: 2 · 2019: 2 · 2018: 6 · 2017: 4 · 2016: 9 · 2015: 6 · 2014: 2
- FWCI
- 2.54
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Proceedings of the National Academy of Sciences (publishedVersion)
- Europe PMC (PubMed Central) (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Max Planck Institute for Plasma Physics (submittedVersion)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
- Health Sciences › Medicine › Pathology and Forensic Medicine › Cardiac Ischemia and Reperfusion
- Keywords
- Twinkle helicase, mitochondrial DNA, cardiomyocytes, oxidative stress, reactive oxygen species, mtDNA point mutations, mtDNA rearrangements, p21, cardiomyopathy, mitochondrial DNA maintenance
- MeSH terms
- Superoxide Dismutase 2, Adaptation, Biological, Animals, Base Sequence, DNA Replication, DNA Helicases, DNA, Mitochondrial, Humans, Immunohistochemistry, Magnetic Resonance Imaging, Molecular Sequence Data, Superoxide Dismutase, Blotting, Western, Electrophoresis, Gel, Two-Dimensional, Reactive Oxygen Species, Mice, Knockout, Oxidative Stress, Gene Expression Profiling, Mitochondrial Proteins, Blotting, Southwestern, Myocytes, Cardiac, Mice, High-Throughput Nucleotide Sequencing
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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