Cited by 45Mitochondrial Function and PathologyDNA Repair MechanismsCardiac Ischemia and Reperfusion

Overexpression of twinkle-helicase protects cardiomyocytes from genotoxic stress caused by reactive oxygen species

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Pohjoismäki, Jaakko L. O., Williams, Siôn L., Boettger, Thomas, Goffart, Steffi, Kim, Johnny, Suomalainen, Anu, Moraes, Carlos T., Braun, Thomas·2013·Proceedings of the National Academy of Sciences

Abstract

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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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)
Venue
Proceedings of the National Academy of Sciences
Published
2013-11-11
Volume
110
Issue
48
Pages
19408-19413
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
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
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

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