Increased negative supercoiling of mtDNA in TOP1mt knockout mice and presence of topoisomerases IIα and IIβ in vertebrate mitochondria

Hongliang Zhang, Yong Wei Zhang, Takehiro Yasukawa, Ilaria Dalla Rosa, Salim Khiati, Yves Pommier

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Topoisomerases are critical for replication, DNA packing and repair, as well as for transcription by allowing changes in DNA topology. Cellular DNA is present both in nuclei and mitochondria, and mitochondrial topoisomerase I (Top1mt) is the only DNA topoisomerase specific for mitochondria in vertebrates. Here, we report in detail the generation of TOP1mt knockout mice, and demonstrate that mitochondrial DNA (mtDNA) displays increased negative supercoiling in TOP1mt knockout cells and murine tissues. This finding suggested imbalanced topoisomerase activity in the absence of Top1mt and the activity of other topoisomerases in mitochondria. Accordingly, we found that both Top2α and Top2β are present and active in mouse and human mitochondria. The presence of Top2α-DNA complexes in the mtDNA D-loop region, at the sites where both ends of 7S DNA are positioned, suggests a structural role for Top2 in addition to its classical topoisomerase activities.

Original languageEnglish
Pages (from-to)7259-7267
Number of pages9
JournalNucleic Acids Research
Volume42
Issue number11
DOIs
Publication statusPublished - Jan 1 2014

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Type II DNA Topoisomerase
Mitochondrial DNA
Knockout Mice
Vertebrates
Mitochondria
Type I DNA Topoisomerase
DNA
DNA Repair

All Science Journal Classification (ASJC) codes

  • Genetics

Cite this

Increased negative supercoiling of mtDNA in TOP1mt knockout mice and presence of topoisomerases IIα and IIβ in vertebrate mitochondria. / Zhang, Hongliang; Zhang, Yong Wei; Yasukawa, Takehiro; Dalla Rosa, Ilaria; Khiati, Salim; Pommier, Yves.

In: Nucleic Acids Research, Vol. 42, No. 11, 01.01.2014, p. 7259-7267.

Research output: Contribution to journalArticle

Zhang, Hongliang ; Zhang, Yong Wei ; Yasukawa, Takehiro ; Dalla Rosa, Ilaria ; Khiati, Salim ; Pommier, Yves. / Increased negative supercoiling of mtDNA in TOP1mt knockout mice and presence of topoisomerases IIα and IIβ in vertebrate mitochondria. In: Nucleic Acids Research. 2014 ; Vol. 42, No. 11. pp. 7259-7267.
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