Browse
Submit Data
Databases
API
Help

Dataset Information

0 Views

0 Connections

0 Citations

0 Reanalyses

0 Downloads

Omics score: 0

Repair of DNA double-strand breaks leaves heritable impairment to genome function

ABSTRACT: Upon DNA breakage, a genomic locus undergoes alterations in 3-D chromatin architecture to facilitate signaling and repair. While cells possess mechanisms to repair damaged DNA, it is unknown whether the surrounding chromatin is restored to its naïve state. We show that a single DNA double-strand break (DSB) within a topologically-associated domain (TAD) harboring conformation-sensitive genes causes lasting chromatin alterations, which persist after completion of DNA repair and feature structural changes, chromatin compaction and loss of local RNA species. Unexpectedly, these newly-acquired features of post-repair chromatin are transmitted to daughter cells and manifest as heritable impairments of gene expression. These findings uncover a hitherto concealed dimension of DNA breakage, which we term post-repair chromatin fatigue, and which confers heritable impairment of gene function beyond DNA repair.

ORGANISM(S): Homo sapiens

PROVIDER: GSE286480 | GEO | 2025/10/23

REPOSITORIES: GEO

ACCESS DATA

Json Xml

Dataset's files

Source:

			Action	DRS
		Other

Items per page:

1 - 1 of 1

Similar Datasets

Heritable Pattern of Oxidized DNA Base Repair Coincides with Pre-Targeting of Repair Complexes to Open Chromatin

Project description:Heritable Pattern of Oxidized DNA Base Repair Coincides with Pre-Targeting of Repair Complexes to Open Chromatin

| PRJNA596647 | ENA

Repair of DNA double-strand breaks leaves heritable impairment to genome function

Project description:Repair of DNA double-strand breaks leaves heritable impairment to genome function

| PRJNA1209569 | ENA

Transcription and FACT facilitate the restoration of replication-coupled chromatin assembly defects

Project description:Genome duplication occurs through the coordinated action of DNA replication and nucleosome assembly at replication forks. Defective nucleosome assembly causes DNA lesions by fork breakage that need to be repaired. In addition, it causes a loss of chromatin integrity. These chromatin alterations can be restored, even though the mechanisms are unknown. Here, we show that the process of chromatin restoration can deal with highly severe chromatin defects induced by the absence of the chaperones CAF1 and Rtt106 or a strong reduction in the pool of available histones, and that this process can be followed by analyzing the topoisomer distribution of the 2m plasmid. Using this assay, we demonstrate that chromatin restoration is slow and independent of checkpoint activation, whereas it requires the action of transcription and the FACT complex. Therefore, cells are able to “repair” not only DNA lesions but also chromatin alterations associated with defective nucleosome assembly.

2023-08-22 | GSE228861 | GEO

Transformation-induced stress at telomeres is counteracted through changes in the telomeric proteome including SAMHD1

Project description:Telomeres play crucial roles during tumorigenesis inducing cellular senescence upon telomere shortening and extensive chromosome instability during telomere crisis. However, it has not been investigated if and how cellular transformation and oncogenic stress alters telomeric chromatin composition and function. Here we transform human fibroblasts by consecutive transduction with vectors expressing hTERT, the SV40 early region and activated H-RasV12. Pairwise comparisons of the telomeric proteome during different stages of transformation reveals upregulation of proteins involved in chromatin remodeling, DNA repair and replication at chromosome ends. Depletion of several of these proteins induces telomere fragility indicating their roles in replication of telomeric DNA. Depletion of SAMHD1, which has reported roles in DNA resection and homology directed repair, leads to telomere breakage events in cells deprived of the shelterin component TRF1. Thus our analysis identifies factors, which accumulate at telomeres during cellular transformation to promote telomere replication and repair, resisting oncogene-borne telomere replication stress.

2018-07-13 | PXD010088 | Pride

Heritable changes in chromatin contacts linked to transgenerational obesity

Project description:Heritable changes in chromatin contacts linked to transgenerational obesity

| PRJNA905053 | ENA

Multigenerational cell tracking of DNA replication and heritable DNA damage

Project description:Multigenerational cell tracking of DNA replication and heritable DNA damage

| PRJNA1076892 | ENA

Heritable human Polycomb silencing is locus-dependent and requires H2AK119ub1 self-propagation

Project description:Heritable gene silencing is essential for the development of multicellular organisms. Polycomb repressive complexes 1 and 2 (PRC1 and 2) catalyze and recognize histone H2A lysine 119 mono-ubiquitination (H2AK119ub1) and histone H3 lysine 27 trimethylation (H3K27me3), respectively, to mediate heritable gene silencing, but the mechanism of inheritance is not fully understood. Using an inducible gene silencing strategy, we show that the epigenetic inheritance of Polycomb silencing in human cells is strongly dependent on local DNA sequences and chromatin environment. In addition, we find that inheritance is not strictly dependent on H3K27me3 recognition and can be partially achieved by H2AK119ub1 catalysis and recognition, independently of H3K27me3. These findings demonstrate that locus specific features and H2AK119ub1 play key roles in inheritance of Polycomb silencing in human cells.

2024-05-15 | GSE209986 | GEO

Replication forks proteomics reveals ATM-dependent rewiring of broken forks to promote restart

Project description:The fidelity of DNA replication is governed by a network of DNA repair mechanisms. Defects in replication fork protection can fuel genome instability in cancer, while also creating cancer-specific vulnerabilities. Here, we provide a comprehensive proteomic characterization of the replication fork response to topoisomerase 1 inhibition, a widely used mainstay chemotherapy. We reveal profound changes in the fork proteome and chromatin environment in response to seDSBs and topological stress, and classify fork repair factors according to their specificity for broken and stalled forks. These distinct fork responses also oppositely affect nucleosome occupancy and nuclear membrane interactions. ATM inhibition dramatically rewired the fork breakage response, revealing that ATM promotes HR-dependent fork restart by concomitantly promoting DNA-end resection and suppressing DSB associated protein ubiquitination and NHEJ. Together, this collection of damaged fork proteomes provides an ample resource to understand fork repair mechanisms and identify druggable targets and novel cancer vulnerabilities.

2021-01-15 | PXD018092 | Pride

Multigenerational cell tracking of DNA replication and heritable DNA damage (bulk)

Project description:Multigenerational cell tracking of DNA replication and heritable DNA damage (bulk)

| PRJNA1217850 | ENA

Multigenerational cell tracking of DNA replication and heritable DNA damage (scRNA)

Project description:Multigenerational cell tracking of DNA replication and heritable DNA damage (scRNA)

| PRJNA1217854 | ENA