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Wanrooij, Sjoerd; Miralles Fusté, Javier; Stewart, James B; Wanrooij, Paulina H; Samuelsson, Tore; Larsson, Nils-Göran; Gustafsson, Claes M; Falkenberg, Maria
EMBO reports, December 2012, Letnik: 13, Številka: 12Journal Article
The mechanisms of mitochondrial DNA replication have been hotly debated for a decade. The strand‐displacement model states that lagging‐strand DNA synthesis is initiated from the origin of light‐strand DNA replication (OriL), whereas the strand‐coupled model implies that OriL is dispensable. Mammalian mitochondria cannot be transfected and the requirements of OriL in vivo have therefore not been addressed. We here use in vivo saturation mutagenesis to demonstrate that OriL is essential for mtDNA maintenance in the mouse. Biochemical and bioinformatic analyses show that OriL is functionally conserved in vertebrates. Our findings strongly support the strand‐displacement model for mtDNA replication. Saturation mutagenesis in mice shows that an origin of light‐strand DNA replication (OriL) is essential for mitochondrial DNA (mtDNA) maintenance in vivo. OriL is further functionally conserved in vertebrates, which lends strong support to the strand displacement model for mtDNA replication.
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