Real-time assessment of mitochondrial DNA heteroplasmy dynamics at the single-cell level.

Autor:	Roussou R; Faculty of Biology, Ludwig-Maximilians-Universität München, 82152, Planegg-Martinsried, Germany.; Graduate School Life Science Munich, 82152, Planegg-Martinsried, Germany., Metzler D; Faculty of Biology, Ludwig-Maximilians-Universität München, 82152, Planegg-Martinsried, Germany., Padovani F; Institute of Functional Epigenetics, Molecular Targets and Therapeutics Center, Helmholtz Zentrum München, 85764, Neuherberg, Germany., Thoma F; Faculty of Biology, Ludwig-Maximilians-Universität München, 82152, Planegg-Martinsried, Germany.; Graduate School Life Science Munich, 82152, Planegg-Martinsried, Germany., Schwarz R; Faculty of Biology, Ludwig-Maximilians-Universität München, 82152, Planegg-Martinsried, Germany., Shraiman B; Kavli Institute for Theoretical Physics, University of California, 93106, Santa Barbara, CA, USA., Schmoller KM; Institute of Functional Epigenetics, Molecular Targets and Therapeutics Center, Helmholtz Zentrum München, 85764, Neuherberg, Germany., Osman C; Faculty of Biology, Ludwig-Maximilians-Universität München, 82152, Planegg-Martinsried, Germany. osman@bio.lmu.de.
Jazyk:	angličtina
Zdroj:	The EMBO journal [EMBO J] 2024 Aug 05. Date of Electronic Publication: 2024 Aug 05.
DOI:	10.1038/s44318-024-00183-5
Abstrakt:	Mitochondrial DNA (mtDNA) is present in multiple copies within cells and is required for mitochondrial ATP generation. Even within individual cells, mtDNA copies can differ in their sequence, a state known as heteroplasmy. The principles underlying dynamic changes in the degree of heteroplasmy remain incompletely understood, due to the inability to monitor this phenomenon in real time. Here, we employ mtDNA-based fluorescent markers, microfluidics, and automated cell tracking, to follow mtDNA variants in live heteroplasmic yeast populations at the single-cell level. This approach, in combination with direct mtDNA tracking and data-driven mathematical modeling reveals asymmetric partitioning of mtDNA copies during cell division, as well as limited mitochondrial fusion and fission frequencies, as critical driving forces for mtDNA variant segregation. Given that our approach also facilitates assessment of segregation between intact and mutant mtDNA, we anticipate that it will be instrumental in elucidating the mechanisms underlying the purifying selection of mtDNA. (© 2024. The Author(s).)
Databáze:	MEDLINE
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