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- W2142596193 abstract "Dna2 is a highly conserved helicase/nuclease that in yeast participates in Okazaki fragment processing, DNA repair, and telomere maintenance. Here, we investigated the biological function of human Dna2 (hDna2). Immunofluorescence and biochemical fractionation studies demonstrated that hDna2 was present in both the nucleus and the mitochondria. Analysis of mitochondrial hDna2 revealed that it colocalized with a subfraction of DNA-containing mitochondrial nucleoids in unperturbed cells. Upon the expression of disease-associated mutant forms of the mitochondrial Twinkle helicase which induce DNA replication pausing/stalling, hDna2 accumulated within nucleoids. RNA interference-mediated depletion of hDna2 led to a modest decrease in mitochondrial DNA replication intermediates and inefficient repair of damaged mitochondrial DNA. Importantly, hDna2 depletion also resulted in the appearance of aneuploid cells and the formation of internuclear chromatin bridges, indicating that nuclear hDna2 plays a role in genomic DNA stability. Together, our data indicate that hDna2 is similar to its yeast counterpart and is a new addition to the growing list of proteins that participate in both nuclear and mitochondrial DNA maintenance." @default.
- W2142596193 created "2016-06-24" @default.
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- W2142596193 date "2009-08-01" @default.
- W2142596193 modified "2023-10-18" @default.
- W2142596193 title "Human Dna2 Is a Nuclear and Mitochondrial DNA Maintenance Protein" @default.
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- W2142596193 doi "https://doi.org/10.1128/mcb.01834-08" @default.
- W2142596193 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2715806" @default.
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