Browse
Submit Data
Databases
API
Help

Dataset Information

0 Views

0 Connections

0 Citations

0 Reanalyses

0 Downloads

Omics score: 0

The mitochondrial single-stranded DNA binding protein directs RNA primer formation for mtDNA replication

ABSTRACT: Single-stranded DNA (ssDNA) binding proteins protect regions of ssDNA formed during processes such as DNA replication and repair. We here devise a genetic screen and identify the mitochondrial ssDNA-binding protein (mtSSB) as a key regulator of mtDNA levels. In mitochondria, RNA synthesis from the light-strand promoter (LSP) is required for transcription as well as for generating the primers for initiation of mtDNA synthesis. We find that mtSSB is essential for mtDNA replication initiation, as transcription is strongly upregulated from the LSP in an mtSSB knockout mouse model, but cannot support the switch to replication. Using deep sequencing as well as biochemical reconstitution experiments, we find that mtSSB is also necessary to restrict transcription initiation and primer formation to specific promoters and origins of replication both in vitro and in vivo. Pathological mutations in human mtSSB cannot efficiently support primer maturation and origin specific initiation of mtDNA replication in vitro.

INSTRUMENT(S): Orbitrap Fusion Lumos

ORGANISM(S): Mus Musculus (mouse)

TISSUE(S): Heart

SUBMITTER: Ilian Atanassov

LAB HEAD: Nils-Göran Larsson

PROVIDER: PXD021799 | Pride | 2021-05-19

REPOSITORIES: Pride

ACCESS DATA

Json Xml

Dataset's files

Source:

			Action	DRS
	190306_LU1_TC_Min_Mito_1_Fract1.raw	Raw
	190306_LU1_TC_Min_Mito_1_Fract10.raw	Raw
	190306_LU1_TC_Min_Mito_1_Fract11.raw	Raw
	190306_LU1_TC_Min_Mito_1_Fract2.raw	Raw
	190306_LU1_TC_Min_Mito_1_Fract3.raw	Raw

Items per page:

1 - 5 of 37

Similar Datasets

The mitochondrial single-stranded DNA binding protein directs RNA primer formation for mtDNA replication

Project description:Single-stranded DNA (ssDNA) binding proteins protect regions of ssDNA formed during processes such as DNA replication and repair. We here devise a genetic screen and identify the mitochondrial ssDNA-binding protein (mtSSB) as a key regulator of mtDNA levels. In mitochondria, RNA synthesis from the light-strand promoter (LSP) is required for transcription as well as for generating the primers for initiation of mtDNA synthesis. We find that mtSSB is essential for mtDNA replication initiation, as transcription is strongly upregulated from the LSP in a mtSSB knockout mouse model, but cannot support the switch to replication. Using deep sequencing as well as biochemical reconstitution experiments, we find that mtSSB is also necessary to restrict transcription initiation and primer formation to specific promoters and origins of replication both in vitro and in vivo. Pathological mutations in human mtSSB cannot efficiently support primer maturation and origin specific initiation of mtDNA replication in vitro.

2022-08-29 | GSE159481 | GEO

The mitochondrial single-stranded DNA binding protein directs RNA primer formation for mtDNA replication [sRNA]

Project description:Single-stranded DNA (ssDNA) binding proteins protect regions of ssDNA formed during processes such as DNA replication and repair. We here devise a genetic screen and identify the mitochondrial ssDNA-binding protein (mtSSB) as a key regulator of mtDNA levels. In mitochondria, RNA synthesis from the light-strand promoter (LSP) is required for transcription as well as for generating the primers for initiation of mtDNA synthesis. We find that mtSSB is essential for mtDNA replication initiation, as transcription is strongly upregulated from the LSP in an mtSSB knockout mouse model, but cannot support the switch to replication. Using deep sequencing as well as biochemical reconstitution experiments, we find that mtSSB is also necessary to restrict transcription initiation and primer formation to specific promoters and origins of replication both in vitro and in vivo. Pathological mutations in human mtSSB cannot efficiently support primer maturation and origin specific initiation of mtDNA replication in vitro.

2021-07-06 | GSE159570 | GEO

The mitochondrial single-stranded DNA binding protein directs RNA primer formation for mtDNA replication [TruSeq]

Project description:Single-stranded DNA (ssDNA) binding proteins protect regions of ssDNA formed during processes such as DNA replication and repair. We here devise a genetic screen and identify the mitochondrial ssDNA-binding protein (mtSSB) as a key regulator of mtDNA levels. In mitochondria, RNA synthesis from the light-strand promoter (LSP) is required for transcription as well as for generating the primers for initiation of mtDNA synthesis. We find that mtSSB is essential for mtDNA replication initiation, as transcription is strongly upregulated from the LSP in an mtSSB knockout mouse model, but cannot support the switch to replication. Using deep sequencing as well as biochemical reconstitution experiments, we find that mtSSB is also necessary to restrict transcription initiation and primer formation to specific promoters and origins of replication both in vitro and in vivo. Pathological mutations in human mtSSB cannot efficiently support primer maturation and origin specific initiation of mtDNA replication in vitro.

2021-07-06 | GSE159569 | GEO

POLRMT regulates the switch between replication-primer formation and gene expression of mammalian mtDNA

Project description:Mitochondria are vital in providing cellular energy via their oxidative phosphorylation system, which requires the coordinated expression of genes encoded by both the nuclear and mitochondrial genomes (mtDNA). Transcription of the circular mammalian mtDNA depends on a single mitochondrial RNA polymerase (POLRMT). Although the transcription initiation process is well understood, it remains highly controversial if POLRMT also serves as the primase for initiation of mtDNA replication. In the nucleus, the RNA polymerases needed for gene expression have no such role. Conditional knockout of Polrmt in heart results in severe mitochondrial dysfunction causing dilated cardiomyopathy in young mice. We further studied the molecular consequences of different expression levels of POLRMT and found that POLRMT is essential for primer synthesis to initiate mtDNA replication in vivo. Furthermore, transcription initiation for primer formation has priority over gene expression. Surprisingly, mitochondrial transcription factor A (TFAM) exists in an mtDNA-free pool in the Polrmt knockout mice. TFAM levels remain unchanged despite strong mtDNA depletion and TFAM is thus protected from degradation of the AAA+ Lon protease in absence of POLRMT. Lastly, mitochondrial transcription elongation factor (TEFM) can compensate for a partial depletion of POLRMT in heterozygous Polrmt knockout mice, indicating a direct regulatory role for this factor in transcription. In conclusion, we present here the first in vivo evidence that POLRMT has a key regulatory role in replication of mammalian mtDNA and is part of a mechanism that provides a switch between RNA primer formation for mtDNA replication and mtDNA expression. Isolated heart mitochondria from three control mice (L/L) and three Polrmt knockout mice (L/L, cre), aged 3-4 weeks, were sequenced and analyzed for differential expression.

2016-08-05 | E-GEOD-83368 | biostudies-arrayexpress

POLRMT regulates the switch between replication-primer formation and gene expression of mammalian mtDNA

2016-08-05 | GSE83368 | GEO

TEFM regulates both transcription elongation and RNA processing in mitochondria

Project description:Regulation of replication and expression of mitochondrial DNA (mtDNA) is essential for cellular energy conversion via oxidative phosphorylation. The mitochondrial transcription elongation factor (TEFM) has been proposed to regulate the switch between transcription termination for replication primer formation and processive, near-genome length transcription for mtDNA gene expression. Here, we report that Tefm is essential for mouse embryogenesis and that levels of promoter-distal mitochondrial transcripts are drastically reduced in conditional Tefm-knockout hearts. In contrast, the promoter-proximal transcripts are much increased in Tefm knockouts, but they mostly terminate before the region where the switch from transcription to replication occurs, and consequently de novo mtDNA replication is profoundly reduced. Unexpectedly, deep sequencing of RNA from Tefm knockouts revealed accumulation of unprocessed transcripts in addition to defective transcription elongation. Furthermore, a proximity labelling (BioID) assay showed that TEFM interacts with multiple RNA processing factors. Our data demonstrate that TEFM acts as a general transcription elongation factor, necessary for both gene transcription and replication primer formation, and loss of TEFM affects RNA processing in mammalian mitochondria.

2019-04-25 | PXD013398 | Pride

Mammalian RNase H1 directs RNA primer formation for mtDNA replication initiation and is also necessary for precise termination of mtDNA replication

Project description:Mammalian RNase H1 directs RNA primer formation for mtDNA replication initiation and is also necessary for precise termination of mtDNA replication

| PRJNA821469 | ENA

Mammalian RNase H1 directs RNA primer formation for mtDNA replication initiation and is also necessary for precise termination of mtDNA replication

Project description:Mammalian RNase H1 directs RNA primer formation for mtDNA replication initiation and is also necessary for precise termination of mtDNA replication

| PRJNA818872 | ENA

Mammalian RNase H1 directs RNA primer formation for mtDNA replication initiation and is also necessary for precise termination of mtDNA replication

Project description:Mammalian RNase H1 directs RNA primer formation for mtDNA replication initiation and is also necessary for precise termination of mtDNA replication

| PRJNA818648 | ENA

Mammalian RNase H1 directs RNA primer formation for mtDNA replication initiation and is also necessary for precise termination of mtDNA replication [RNA-seq]

Project description:Mammalian RNase H1 directs RNA primer formation for mtDNA replication initiation and is also necessary for precise termination of mtDNA replication [RNA-seq]

| PRJNA818639 | ENA

OmicsDI is part of the ELIXIR infrastructure

OmicsDI is an Elixir interoperability service. Learn more ›

Tweets

OmicsDI Databases

PRIDE
PeptideAtlas
MassIVE
JPOST Repository
Physiome Model Repository

EGA
EVA
ENA
LINCS
PAXDB
Cell Collective

MetaboLights
Metabolomics Workbench
MetabolomeExpress
GNPS
BioModels
FAIRDOMHub

ArrayExpress
dbGaP
ExpressionAtlas
GEO
NODE

Information

Databases
Help
API
Contact us
Code on GitHub
Terms of use
Submit Data