title: An increase in mitochondrial DNA promotes nuclear DNA replication in yeast.
abstract: Coordination between cellular metabolism and DNA replication determines when cells initiate division. It has been assumed that metabolism only plays a permissive role in cell division. While blocking metabolism arrests cell division, it is not known whether an up-regulation of metabolic reactions accelerates cell cycle transitions. Here, we show that increasing the amount of mitochondrial DNA accelerates overall cell proliferation and promotes nuclear DNA replication, in a nutrient-dependent manner. The Sir2p NAD+-dependent de-acetylase antagonizes this mitochondrial role. We found that cells with increased mitochondrial DNA have reduced Sir2p levels bound at origins of DNA replication in the nucleus, accompanied with increased levels of K9, K14-acetylated histone H3 at those origins. Our results demonstrate an active role of mitochondrial processes in the control of cell division. They also suggest that cellular metabolism may impact on chromatin modifications to regulate the activity of origins of DNA replication.
authors.affiliation: Department of Biochemistry and Biophysics, Texas A&M University, College Station, Texas, United States of America.
authors.forename: Heidi M
authors.initials: HM
authors.lastname: Blank
authors.forename: Chonghua
authors.initials: C
authors.lastname: Li
authors.forename: John E
authors.initials: JE
authors.lastname: Mueller
authors.forename: Lydia M
authors.initials: LM
authors.lastname: Bogomolnaya
authors.forename: Mary
authors.initials: M
authors.lastname: Bryk
authors.forename: Michael
authors.initials: M
authors.lastname: Polymenis
mesh_terms: D001665:Binding Sites / Q000235:genetics; D002453:Cell Cycle; D002467:Cell Nucleus / Q000235:genetics / Q000378:metabolism; D049109:Cell Proliferation; D004261:DNA Replication; D004271:DNA, Fungal / Q000096:biosynthesis* / Q000235:genetics; D004272:DNA, Mitochondrial / Q000235:genetics / Q000378:metabolism*; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism; D005800:Genes, Fungal; D006655:Histone Deacetylases / Q000235:genetics / Q000378:metabolism; D008954:Models, Biological; D009154:Mutation; D018741:Replication Origin; D012441:Saccharomyces cerevisiae / Q000166:cytology / Q000235:genetics* / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000378:metabolism; D038281:Silent Information Regulator Proteins, Saccharomyces cerevisiae / Q000235:genetics / Q000378:metabolism; D056565:Sirtuin 2; D037761:Sirtuins / Q000235:genetics / Q000378:metabolism; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism
chemical_list: C072843:ABF2 protein, S cerevisiae; D004271:DNA, Fungal; D004272:DNA, Mitochondrial; D004268:DNA-Binding Proteins; D029701:Saccharomyces cerevisiae Proteins; D038281:Silent Information Regulator Proteins, Saccharomyces cerevisiae; D014157:Transcription Factors; C087778:SIR2 protein, S cerevisiae; D056565:Sirtuin 2; D037761:Sirtuins; D006655:Histone Deacetylases