Asymmetric inheritance of spindle microtubule-organizing centres preserves replicative lifespan

The differential distribution of the microtubule-organizing centres (MTOCs) that orchestrate spindle formation during cell division is a fascinating phenomenon originally described in Saccharomyces cerevisiae and later found to be conserved during stem cell divisions in organisms ranging from Drosop...

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Published inNature cell biology Vol. 21; no. 8; pp. 952 - 965
Main Authors Manzano-López, Javier, Matellán, Laura, Álvarez-Llamas, Alejandra, Blanco-Mira, José Carlos, Monje-Casas, Fernando
Format Journal Article
LanguageEnglish
Published London Nature Publishing Group UK 01.08.2019
Nature Publishing Group
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Summary:The differential distribution of the microtubule-organizing centres (MTOCs) that orchestrate spindle formation during cell division is a fascinating phenomenon originally described in Saccharomyces cerevisiae and later found to be conserved during stem cell divisions in organisms ranging from Drosophila to humans. Whether predetermined MTOC inheritance patterns fulfil any biological function is however unknown. Using a genetically designed S. cerevisiae strain that displays a constitutively inverted MTOC fate, we demonstrate that the asymmetric segregation of these structures is critical to ensure normal levels of the Sir2 sirtuin and correct localization of the mitochondrial inheritance regulator Mfb1, and therefore to properly distribute functional mitochondria and protein aggregates between the mother and daughter cells. Consequently, interfering with this process severely accelerates cellular ageing. Yeast cells segregate the old spindle pole body into the bud. Manzano-López et al. report that inverted segregation accelerates ageing due to aberrant partition of protein aggregates and damaged mitochondria.
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ISSN:1465-7392
1476-4679
1476-4679
DOI:10.1038/s41556-019-0364-8