Homo sapiens
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ABSTRACT:
PROVIDER: PRJNA474594 | ENA |
REPOSITORIES: ENA
Similar Datasets
Project description:The Mec1/ATR kinase coordinates multiple cellular responses to replication stress. In addition to its canonical role in activating the checkpoint kinase Rad53, Mec1 also plays checkpoint-independent roles in genome maintenance that are not well understood. Here we employed a combined genetic-phosphoproteomic approach to manipulate Mec1 activation and globally monitor Mec1 signaling, allowing us to delineate distinct checkpoint-independent modes of Mec1 action. Using cells in which endogenous Mec1 activators were genetically ablated, we found that expression of “free” Mec1 Activation Domains (MADs) can robustly activate Mec1 and rescue the severe DNA replication and growth defects of these cells back to wild-type levels. However, unlike the activation mediated by endogenous activator-proteins, “free” MADs are unable to stimulate Mec1-mediated suppression of gross chromosomal rearrangements (GCRs), revealing that Mec1’s role in genome maintenance is separable from a previously unappreciated pro-replicative function. Both Mec1’s functions in promoting replication and suppressing GCRs are independent of the downstream checkpoint kinases. Additionally, Mec1-dependent GCR suppression seems to require localized Mec1 action at DNA lesions, which correlates with the phosphorylation of activator-proximal substrates involved in homologous recombination-mediated DNA repair. These findings establish that Mec1 initiates checkpoint signaling, promotes DNA replication, and maintains genetic stability through distinct modes of action.
2019-01-14 | PXD009734 | Pride
Project description:It has been proposed that ATR kinase senses the completion of DNA replication to initiate the S/G2 transition. In contrast to this model, we show here that the TRESLIN-MTBP complex prevents a premature entry into G2 from early S-phase independently of ATR/CHK1 kinases. TRESLIN-MTBP acts transiently at pre-replication complexes (preRCs) to initiate origin firing and is released after the subsequent recruitment of CDC45. This dynamic behavior of TRESLIN-MTBP implements a monitoring system that checks the activation of replication forks and senses the rate of origin firing to prevent the entry into G2. This system detects the decline in the number of origins of replication that naturally occurs in very late S, which is the signature that cells use to determine the completion of DNA replication and permit the S/G2 transition. Our work introduces TRESLIN-MTBP as a key player in cell cycle control independent of canonical checkpoints.
2023-03-11 | PXD035353 | Pride
Project description:It has been proposed that ATR kinase senses the completion of DNA replication to initiate the S/G2 transition. In contrast to this model, we show here that the TRESLIN-MTBP complex prevents a premature entry into G2 from early S-phase independently of ATR/CHK1 kinases. TRESLIN-MTBP acts transiently at pre-replication complexes (preRCs) to initiate origin firing and is released after the subsequent recruitment of CDC45. This dynamic behavior of TRESLIN-MTBP implements a monitoring system that checks the activation of replication forks and senses the rate of origin firing to prevent the entry into G2. This system detects the decline in the number of origins of replication that naturally occurs in very late S, which is the signature that cells use to determine the completion of DNA replication and permit the S/G2 transition. Our work introduces TRESLIN-MTBP as a key player in cell cycle control independent of canonical checkpoints.
2022-08-06 | GSE210129 | GEO
Project description:During gamete formation, crossover recombination must occur on replicated DNA to ensure proper chromosome segregation in the first meiotic division. We identified a Mec1/ATR-dependent replication checkpoint in budding yeast that prevented the earliest stage of recombination, the programmed induction of DNA double-strand breaks (DSBs), when pre-meiotic DNA replication was delayed. The checkpoint suppressed DSBs through three complementary mechanisms: inhibition of Mer2 phosphorylation by Dbf4-dependent Cdc7 kinase, preclusion of chromosomal loading of Rec114 and Mre11, and lowered abundance of the Spo11 nuclease. Without this checkpoint, cells formed DSBs on partially replicated chromosomes. Importantly, such DSBs frequently failed to be repaired and impeded further DNA synthesis, leading to a rapid loss in cell viability. We conclude that a checkpoint-dependent constraint of DSB formation to duplicated DNA is critical not only for meiotic chromosome assortment, but also to protect genome integrity during gametogenesis. DSB factor association was measured in wild-type and checkpoint mutants strains under non-inducing or replication checkpoint inducing conditions. Additionally, DNA replication and helicase loading were measured in a replication and checkpoint deficient strain (cdc6-mn).
2013-09-20 | E-GEOD-46841 | biostudies-arrayexpress
Project description:We propose an integrated computational model for the network of cyclin-dependent kinases (Cdks) that controls the dynamics of the mammalian cell cycle. The model contains four Cdk modules regulated by reversible phosphorylation, Cdk inhibitors, and protein synthesis or degradation. Growth factors (GFs) trigger the transition from a quiescent, stable steady state to self-sustained oscillations in the Cdk network. These oscillations correspond to the repetitive, transient activation of cyclin D/Cdk4-6 in G(1), cyclin E/Cdk2 at the G(1)/S transition, cyclin A/Cdk2 in S and at the S/G(2) transition, and cyclin B/Cdk1 at the G(2)/M transition. The model accounts for the following major properties of the mammalian cell cycle: (i) repetitive cell cycling in the presence of suprathreshold amounts of GF; (ii) control of cell-cycle progression by the balance between antagonistic effects of the tumor suppressor retinoblastoma protein (pRB) and the transcription factor E2F; and (iii) existence of a restriction point in G(1), beyond which completion of the cell cycle becomes independent of GF. The model also accounts for endoreplication. Incorporating the DNA replication checkpoint mediated by kinases ATR and Chk1 slows down the dynamics of the cell cycle without altering its oscillatory nature and leads to better separation of the S and M phases. The model for the mammalian cell cycle shows how the regulatory structure of the Cdk network results in its temporal self-organization, leading to the repetitive, sequential activation of the four Cdk modules that brings about the orderly progression along cell-cycle phases.
2019-06-28 | BIOMD0000000730 | BioModels
Project description:Transient obstruction of DNA polymerase progression activates the ATR checkpoint kinase, which suppresses fork breakage, strand resection, and RPA accumulation. Herein, we use RPA ChIP-Seq to identify replication-problematic loci (RPLs) across the mammalian genome from ATR inhibition.
2018-10-04 | GSE100790 | GEO
Project description:Transient obstruction of DNA polymerase progression activates the ATR checkpoint kinase, which suppresses fork breakage, strand resection, and RPA accumulation. Herein, we use a developed DNA break-detection assay, BrITL, to identify replication-problematic loci that become processed into persistent double-strand breaks across the human genome from ATR inhibition.
2018-10-04 | GSE115623 | GEO
Project description:Transient obstruction of DNA polymerase progression activates the ATR checkpoint kinase, which suppresses fork breakage, strand resection, and RPA accumulation. Herein, we use a developed DNA break-detection assay, BrITL, to identify replication-problematic loci (RPLs) that become processed into persistent double-strand breaks across the mammalian genome from ATR inhibition.
2018-10-04 | GSE115624 | GEO
Project description:Jaiswal2017 - Cell cycle arrest
This model is described in the article:
ATM/Wip1 activities at
chromatin control Plk1 re-activation to determine G2 checkpoint
duration.
Jaiswal H, Benada J, Müllers E,
Akopyan K, Burdova K, Koolmeister T, Helleday T, Medema RH,
Macurek L, Lindqvist A.
EMBO J. 2017 Jul; 36(14):
2161-2176
Abstract:
After DNA damage, the cell cycle is arrested to avoid
propagation of mutations. Arrest in G2 phase is initiated by
ATM-/ATR-dependent signaling that inhibits mitosis-promoting
kinases such as Plk1. At the same time, Plk1 can counteract
ATR-dependent signaling and is required for eventual resumption
of the cell cycle. However, what determines when Plk1 activity
can resume remains unclear. Here, we use FRET-based reporters
to show that a global spread of ATM activity on chromatin and
phosphorylation of ATM targets including KAP1 control Plk1
re-activation. These phosphorylations are rapidly counteracted
by the chromatin-bound phosphatase Wip1, allowing cell cycle
restart despite persistent ATM activity present at DNA lesions.
Combining experimental data and mathematical modeling, we
propose a model for how the minimal duration of cell cycle
arrest is controlled. Our model shows how cell cycle restart
can occur before completion of DNA repair and suggests a
mechanism for checkpoint adaptation in human cells.
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2014-03-28 | BIOMD0000000641 | BioModels
Project description:DNA replication stress drives genomic instability, thus contributing to the rapid evolution of tumours. Sustained E2F-dependent transcription, which is actively maintained in a checkpoint-dependent manner, is required for replication stress tolerance and is a key mechanism preventing the generation of DNA damage under these conditions. However, the activation and regulation of the E2F response remains poorly understood. Here, we establish a role for SETD2-dependent H3K36 trimethylation in facilitating E2F target gene expression in S-phase and promoting efficient DNA replication under both normal and replication stress conditions in human cells. Loss of SETD2 results in reduced E2F1-binding to its target genes, causing expression defects in almost all E2F transcripts, including CDT1, CDC6, and MCM2-7. Further, we find that E2F target gene expression following hydroxyurea-induced replication fork stalling requires ATR-dependent H3K36 trimethylation. Accordingly, SETD2 loss results in reduced replication fork progression and increased levels of replication stress-induced DNA damage, indicative of reduced replication stress tolerance. Together, these findings establish a central role for SETD2-dependent H3K36me3 in the replication stress checkpoint, thereby ensuring genomic integrity.
2023-08-25 | GSE182775 | GEO