Role of 53BP1 in End Protection and DNA synthesis at DNA breaks
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA752898 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR15370002.fastq.gz | Fastqsanger.gz | |||
| SRR15370003.fastq.gz | Fastqsanger.gz | |||
| SRR15370004.fastq.gz | Fastqsanger.gz | |||
| SRR15370005.fastq.gz | Fastqsanger.gz | |||
| SRR15370006.fastq.gz | Fastqsanger.gz |
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Project description:Double-strand break (DSB) repair choice is greatly influenced by the initial processing of DNA ends. 53BP1 limits the formation of recombinogenic single strand DNA (ssDNA) in BRCA1-deficient cells leading to defects in homologous recombination (HR). However, the exact mechanisms by which 53BP1 inhibits DSB resection remain unclear. Previous studies have identified two potential pathways: protection against exonucleases presumably through the Shieldin (SHLD) complex binding to ssDNA, and localized DNA synthesis through the (CTC1-STN1-TEN1) CST and DNA polymerase alpha (Polα) to counteract resection. We present evidence here that 53BP1-mediated exonuclease protection plays a more significant role than CST/Polα synthesis in countering hyper-resection at DSBs in G1 phase. Using a combinatorial approach of END-seq, SAR-seq, and RPA ChIP-seq, we directly assessed the extent of resection, DNA synthesis, and ssDNA, respectively, at AsiSI-induced DSBs. We show that in the presence of 53BP1, Polα-dependent DNA synthesis reduces the fraction of resected DSBs and the resection lengths. However, in the absence of 53BP1, Polα activity is sustained on ssDNA yet does not substantially counter resection. In contrast, Exo1 nuclease activity is essential for hyperresection in the absence of 53BP1. Thus, 53BP1 inhibits resection mainly through end-protection rather than by promoting fill-in.
2021-09-10 | GSE181669 | GEO
Project description:Double-strand break (DSB) repair choice is greatly influenced by the initial processing of DNA ends. 53BP1 limits the formation of recombinogenic single strand DNA (ssDNA) in BRCA1-deficient cells leading to defects in homologous recombination (HR). However, the exact mechanisms by which 53BP1 inhibits DSB resection remain unclear. Previous studies have identified two potential pathways: protection against exonucleases presumably through the Shieldin (SHLD) complex binding to ssDNA, and localized DNA synthesis through the (CTC1-STN1-TEN1) CST and DNA polymerase alpha (Polα) to counteract resection. We present evidence here that 53BP1-mediated exonuclease protection plays a more significant role than CST/Polα synthesis in countering hyper-resection at DSBs in G1 phase. Using a combinatorial approach of END-seq, SAR-seq, and RPA ChIP-seq, we directly assessed the extent of resection, DNA synthesis, and ssDNA, respectively, at AsiSI-induced DSBs. We show that in the presence of 53BP1, Polα-dependent DNA synthesis reduces the fraction of resected DSBs and the resection lengths. However, in the absence of 53BP1, Polα activity is sustained on ssDNA yet does not substantially counter resection. In contrast, Exo1 nuclease activity is essential for hyperresection in the absence of 53BP1. Thus, 53BP1 inhibits resection mainly through end-protection rather than by promoting fill-in.
2021-09-10 | GSE181668 | GEO
Project description:Double-strand break (DSB) repair choice is greatly influenced by the initial processing of DNA ends. 53BP1 limits the formation of recombinogenic single strand DNA (ssDNA) in BRCA1-deficient cells leading to defects in homologous recombination (HR). However, the exact mechanisms by which 53BP1 inhibits DSB resection remain unclear. Previous studies have identified two potential pathways: protection against exonucleases presumably through the Shieldin (SHLD) complex binding to ssDNA, and localized DNA synthesis through the (CTC1-STN1-TEN1) CST and DNA polymerase alpha (Polα) to counteract resection. We present evidence here that 53BP1-mediated exonuclease protection plays a more significant role than CST/Polα synthesis in countering hyper-resection at DSBs in G1 phase. Using a combinatorial approach of END-seq, SAR-seq, and RPA ChIP-seq, we directly assessed the extent of resection, DNA synthesis, and ssDNA, respectively, at AsiSI-induced DSBs. We show that in the presence of 53BP1, Polα-dependent DNA synthesis reduces the fraction of resected DSBs and the resection lengths. However, in the absence of 53BP1, Polα activity is sustained on ssDNA yet does not substantially counter resection. In contrast, Exo1 nuclease activity is essential for hyperresection in the absence of 53BP1. Thus, 53BP1 inhibits resection mainly through end-protection rather than by promoting fill-in.
2021-09-10 | GSE181667 | GEO
Project description:Role of 53BP1 in End Protection and DNA synthesis at DNA breaks [END-seq]
| PRJNA752903 | ENA
Project description:Role of 53BP1 in End Protection and DNA synthesis at DNA breaks [SAR-seq]
| PRJNA752901 | ENA
Project description:Role of 53BP1 in End Protection and DNA synthesis at DNA breaks [ChIP-seq]
| PRJNA752902 | ENA
Project description:Double-strand break (DSB) repair choice is greatly influenced by the initial processing of DNA ends. 53BP1 limits the formation of recombinogenic single-strand DNA (ssDNA) in BRCA1-deficient cells, leading to defects in homologous recombination (HR). However, the exact mechanisms by which 53BP1 inhibits DSB resection remain unclear. Previous studies have identified two potential pathways: protection against DNA2/EXO1 exonucleases presumably through the Shieldin (SHLD) complex binding to ssDNA, and localized DNA synthesis through the CTC1-STN1-TEN1 (CST) and DNA polymerase α (Polα) to counteract resection. Using a combinatorial approach of END-seq, SAR-seq, and RPA ChIP-seq, we directly assessed the extent of resection, DNA synthesis, and ssDNA, respectively, at restriction enzyme-induced DSBs. We show that, in the presence of 53BP1, Polα-dependent DNA synthesis reduces the fraction of resected DSBs and the resection lengths in G0/G1, supporting a previous model that fill-in synthesis can limit the extent of resection. However, in the absence of 53BP1, Polα activity is sustained on ssDNA yet does not substantially counter resection. In contrast, EXO1 nuclease activity is essential for hyperresection in the absence of 53BP1. Thus, Polα-mediated fill-in partially limits resection in the presence of 53BP1 but cannot counter extensive hyperresection due to the loss of 53BP1 exonuclease blockade. These data provide the first nucleotide mapping of DNA synthesis at resected DSBs and provide insight into the relationship between fill-in polymerases and resection exonucleases.
| S-EPMC8494207 | biostudies-literature
Project description:This SuperSeries is composed of the SubSeries listed below.
2021-09-10 | GSE181670 | GEO
Project description:53BP1 regulates DNA end-joining in lymphocytes, diversifying immune antigen receptors. This involves nucleosome-bound 53BP1 at DNA double-stranded breaks (DSBs) recruiting RIF1 and shieldin, a poorly understood DNA-binding complex. The 53BP1-RIF1-shieldin axis is pathological in BRCA1-mutated cancers, blocking homologous recombination (HR) and driving illegitimate non-homologous end-joining (NHEJ). However, how this axis regulates DNA end-joining and HR suppression remains unresolved. We investigated shieldin and its interplay with CST, a complex recently implicated in 53BP1-dependent activities. Immunophenotypically, mice lacking shieldin or CST are equivalent, with class-switch recombination co-reliant on both complexes. DNA damage-responsive signalling promotes shieldin-CST interaction, demonstrating shieldin as a DSB-specific CST adaptor. Furthermore, DNA polymerase ζ functions downstream of shieldin, establishing DNA fill-in synthesis as the physiological function of shieldin-CST. Lastly, 53BP1 suppresses HR and promotes NHEJ in BRCA1-deficient cells independently of shieldin. These findings showcase the resilience of the 53BP1 pathway, achieved through the collaboration of chromatin-bound 53BP1 complexes and DNA end-processing effector proteins.
2024-08-27 | PXD045534 | Pride
Project description:DNA double-strand breaks (DSBs) represent a threat to the genome because they can lead to loss of genetic information and chromosome rearrangements. The DNA repair protein p53 binding protein 1 (53BP1) protects the genome by limiting nucleolytic processing of DSBs by a mechanism that requires its phosphorylation, but whether it does so directly is not known. Here we identify Rapl-interacting factor 1 (Rif1) as an Ataxia-Telangiectasia Mutated (ATM) phosphorylation-dependent interactor of 53BP1, and show that absence of Rif1 results in 5M-bM-^@M-^Y-3M-bM-^@M-^Y DNA end resection in mice. Consistent with enhanced DNA resection, Rif1 deficiency impairs DNA repair in the G1 and S phases of the cell cycle, interferes with class switch recombination (CSR) in B lymphocytes, and leads to accumulation of chromosome DSBs. Study of Rif1 DNA-end protection activity against resection via analysis of single-stranded DNA binding protein RPA and Rad51 accumulation at sites of AID-induced DNA damage by ChIP-seq. All samples shown in Fig. 4 are included (controls and test samples, 7 samples in total).
2013-03-01 | E-GEOD-42298 | biostudies-arrayexpress