Prevention of mitochondrial genomic instability in yeast by the mitochondrial recombinase Mhr1 View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2019-12

AUTHORS

Feng Ling, Elliot Bradshaw, Minoru Yoshida

ABSTRACT

Mitochondrial (mt) DNA encodes factors essential for cellular respiration, therefore its level and integrity are crucial. ABF2 encodes a mitochondrial DNA-binding protein and its null mutation (Δabf2) induces mtDNA instability in Saccharomyces cerevisiae. Mhr1 is a mitochondrial recombinase that mediates the predominant form of mtDNA replication and acts in mtDNA segregation and the repair of mtDNA double-stranded breaks (DSBs). However, the involvement of Mhr1 in prevention of mtDNA deletion mutagenesis is unknown. In this study we used Δabf2 mhr1-1 double-mutant cells, which lose mitochondrial function in media containing fermentable carbon sources, to investigate whether Mhr1 is a suppressor of mtDNA deletion mutagenesis. We used a suppresivity assay and Southern blot analysis to reveal that the Δabf2 mutation causes mtDNA deletions rather than an mtDNA-lacking (ρ0) phenotype, and observed that mtDNA deletions are exacerbated by an additional mhr1-1 mutation. Loss of respiratory function due to mtDNA fragmentation occurred in ∆mhr1 and ∆abf2 mhr1-1 cells. However, exogenous introduction of Mhr1 into Δabf2 mhr1-1 cells significantly rescued respiratory growth, suggesting that Mhr1-driven homologous mtDNA recombination prevents mtDNA instability. More... »

PAGES

5433

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/s41598-019-41699-9

DOI

http://dx.doi.org/10.1038/s41598-019-41699-9

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1113161200

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/30931958


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53 schema:description Mitochondrial (mt) DNA encodes factors essential for cellular respiration, therefore its level and integrity are crucial. ABF2 encodes a mitochondrial DNA-binding protein and its null mutation (Δabf2) induces mtDNA instability in Saccharomyces cerevisiae. Mhr1 is a mitochondrial recombinase that mediates the predominant form of mtDNA replication and acts in mtDNA segregation and the repair of mtDNA double-stranded breaks (DSBs). However, the involvement of Mhr1 in prevention of mtDNA deletion mutagenesis is unknown. In this study we used Δabf2 mhr1-1 double-mutant cells, which lose mitochondrial function in media containing fermentable carbon sources, to investigate whether Mhr1 is a suppressor of mtDNA deletion mutagenesis. We used a suppresivity assay and Southern blot analysis to reveal that the Δabf2 mutation causes mtDNA deletions rather than an mtDNA-lacking (ρ<sup>0</sup>) phenotype, and observed that mtDNA deletions are exacerbated by an additional mhr1-1 mutation. Loss of respiratory function due to mtDNA fragmentation occurred in ∆mhr1 and ∆abf2 mhr1-1 cells. However, exogenous introduction of Mhr1 into Δabf2 mhr1-1 cells significantly rescued respiratory growth, suggesting that Mhr1-driven homologous mtDNA recombination prevents mtDNA instability.
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