DNA Repair最新文献

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Mediator complex in transcription regulation and DNA repair: Relevance for human diseases 转录调节和 DNA 修复中的中介复合物:与人类疾病的相关性
IF 3 3区 生物学
DNA Repair Pub Date : 2024-06-24 DOI: 10.1016/j.dnarep.2024.103714
Christelle A. Maalouf, Adriana Alberti, Julie Soutourina
{"title":"Mediator complex in transcription regulation and DNA repair: Relevance for human diseases","authors":"Christelle A. Maalouf,&nbsp;Adriana Alberti,&nbsp;Julie Soutourina","doi":"10.1016/j.dnarep.2024.103714","DOIUrl":"10.1016/j.dnarep.2024.103714","url":null,"abstract":"<div><p>The Mediator complex is an essential coregulator of RNA polymerase II transcription. More recent developments suggest Mediator functions as a link between transcription regulation, genome organisation and DNA repair mechanisms including nucleotide excision repair, base excision repair, and homologous recombination. Dysfunctions of these processes are frequently associated with human pathologies, and growing evidence shows Mediator involvement in cancers, neurological, metabolic and infectious diseases. The detailed deciphering of molecular mechanisms of Mediator functions, using interdisciplinary approaches in different biological models and considering all functions of this complex, will contribute to our understanding of relevant human diseases.</p></div>","PeriodicalId":300,"journal":{"name":"DNA Repair","volume":"141 ","pages":"Article 103714"},"PeriodicalIF":3.0,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1568786424000909/pdfft?md5=a393c22f2a7612e5fa75d83817ca742a&pid=1-s2.0-S1568786424000909-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141473879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
PARticular MARks: Histone ADP-ribosylation and the DNA damage response PARticular MARks:组蛋白 ADP- 核糖基化和 DNA 损伤反应
IF 3 3区 生物学
DNA Repair Pub Date : 2024-06-22 DOI: 10.1016/j.dnarep.2024.103711
Cem Özdemir , Laura R. Purkey , Anthony Sanchez , Kyle M. Miller
{"title":"PARticular MARks: Histone ADP-ribosylation and the DNA damage response","authors":"Cem Özdemir ,&nbsp;Laura R. Purkey ,&nbsp;Anthony Sanchez ,&nbsp;Kyle M. Miller","doi":"10.1016/j.dnarep.2024.103711","DOIUrl":"10.1016/j.dnarep.2024.103711","url":null,"abstract":"<div><p>Cellular and molecular responses to DNA damage are highly orchestrated and dynamic, acting to preserve the maintenance and integrity of the genome. Histone proteins bind DNA and organize the genome into chromatin. Post-translational modifications of histones have been shown to play an essential role in orchestrating the chromatin response to DNA damage by regulating the DNA damage response pathway. Among the histone modifications that contribute to this intricate network, histone ADP-ribosylation (ADPr) is emerging as a pivotal component of chromatin-based DNA damage response (DDR) pathways. In this review, we survey how histone ADPr is regulated to promote the DDR and how it impacts chromatin and other histone marks. Recent advancements have revealed histone ADPr effects on chromatin structure and the regulation of DNA repair factor recruitment to DNA lesions. Additionally, we highlight advancements in technology that have enabled the identification and functional validation of histone ADPr in cells and in response to DNA damage. Given the involvement of DNA damage and epigenetic regulation in human diseases including cancer, these findings have clinical implications for histone ADPr, which are also discussed. Overall, this review covers the involvement of histone ADPr in the DDR and highlights potential future investigations aimed at identifying mechanisms governed by histone ADPr that participate in the DDR, human diseases, and their treatments.</p></div>","PeriodicalId":300,"journal":{"name":"DNA Repair","volume":"140 ","pages":"Article 103711"},"PeriodicalIF":3.0,"publicationDate":"2024-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141461380","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Replication initiation sites and zones in the mammalian genome: Where are they located and how are they defined? 哺乳动物基因组中的复制起始位点和区域:它们位于何处,如何定义?
IF 3 3区 生物学
DNA Repair Pub Date : 2024-06-22 DOI: 10.1016/j.dnarep.2024.103713
Xiaoxuan Zhu , Masato T. Kanemaki
{"title":"Replication initiation sites and zones in the mammalian genome: Where are they located and how are they defined?","authors":"Xiaoxuan Zhu ,&nbsp;Masato T. Kanemaki","doi":"10.1016/j.dnarep.2024.103713","DOIUrl":"10.1016/j.dnarep.2024.103713","url":null,"abstract":"<div><p>Eukaryotic DNA replication is a tightly controlled process that occurs in two main steps, i.e., licensing and firing, which take place in the G1 and S phases of the cell cycle, respectively. In <em>Saccharomyces cerevisiae</em>, the budding yeast, replication origins contain consensus sequences that are recognized and bound by the licensing factor Orc1–6, which then recruits the replicative Mcm2–7 helicase. By contrast, mammalian initiation sites lack such consensus sequences, and the mammalian ORC does not exhibit sequence specificity. Studies performed over the past decades have identified replication initiation sites in the mammalian genome using sequencing-based assays, raising the question of whether replication initiation occurs at confined sites or in broad zones across the genome. Although recent reports have shown that the licensed MCMs in mammalian cells are broadly distributed, suggesting that ORC-dependent licensing may not determine the initiation sites/zones, they are predominantly located upstream of actively transcribed genes. This review compares the mechanism of replication initiation in yeast and mammalian cells, summarizes the sequencing-based technologies used for the identification of initiation sites/zones, and proposes a possible mechanism of initiation-site/zone selection in mammalian cells. Future directions and challenges in this field are also discussed.</p></div>","PeriodicalId":300,"journal":{"name":"DNA Repair","volume":"141 ","pages":"Article 103713"},"PeriodicalIF":3.0,"publicationDate":"2024-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141499976","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Methylation and hydroxymethylation of cytosine alter activity and fidelity of translesion DNA polymerases 胞嘧啶的甲基化和羟甲基化改变了转座子 DNA 聚合酶的活性和保真度。
IF 3 3区 生物学
DNA Repair Pub Date : 2024-06-19 DOI: 10.1016/j.dnarep.2024.103712
Evgeniy S. Shilkin , Daria V. Petrova , Anna A. Novikova , Elizaveta O. Boldinova , Dmitry O. Zharkov , Alena V. Makarova
{"title":"Methylation and hydroxymethylation of cytosine alter activity and fidelity of translesion DNA polymerases","authors":"Evgeniy S. Shilkin ,&nbsp;Daria V. Petrova ,&nbsp;Anna A. Novikova ,&nbsp;Elizaveta O. Boldinova ,&nbsp;Dmitry O. Zharkov ,&nbsp;Alena V. Makarova","doi":"10.1016/j.dnarep.2024.103712","DOIUrl":"10.1016/j.dnarep.2024.103712","url":null,"abstract":"<div><p>Epigenetic cytosine methylation covers most of genomic CpG dinucleotides in human cells. In addition to common deamination-mediated mutagenesis at CpG sites, an alternative deamination-independent pathway associated with DNA polymerase activity was previously described. This mutagenesis is characterized by the T<u>C</u>G→T<u>T</u>G mutational signature and is believed to arise from dAMP misincorporation opposite 5-methylcytosine (mC) or its oxidized derivative 5-hydroxymethylcytosine (hmC) by B-family replicative DNA polymerases with disrupted proofreading 3→5′-exonuclease activity. In addition to being less stable and pro-mutagenic themselves, cytosine modifications also increase the risk of adjacent nucleotides damage, including the formation of 8-oxo-2'-deoxyguanosine (8-oxoG), a well-known mutagenic lesion. The effect of cytosine methylation on error-prone DNA polymerases lacking proofreading activity and involved in repair and DNA translesion synthesis remains unexplored. Here we analyze the efficiency and fidelity of translesion Y-family polymerases (Pol κ, Pol η, Pol ι and REV1) and primase-polymerase PrimPol opposite mC and hmC as well as opposite 8-oxoG adjacent to mC in the TCG context. We demonstrate that epigenetic cytosine modifications suppress Pol ι and REV1 activities and lead to increasing dAMP misincorporation by PrimPol, Pol κ and Pol ι <em>in vitro</em>. Cytosine methylation also increases misincorporation of dAMP opposite the adjacent 8-oxoG by PrimPol, decreases the TLS activity of Pol η opposite the lesion but increases dCMP incorporation opposite 8-oxoG by REV1. Altogether, these data suggest that methylation and hydroxymethylation of cytosine alter activity and fidelity of translesion DNA polymerases.</p></div>","PeriodicalId":300,"journal":{"name":"DNA Repair","volume":"141 ","pages":"Article 103712"},"PeriodicalIF":3.0,"publicationDate":"2024-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141499950","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
KBM-mediated interactions with KU80 promote cellular resistance to DNA replication stress in CHO cells KBM 介导的与 KU80 的相互作用促进 CHO 细胞对 DNA 复制压力的抵抗力
IF 3.8 3区 生物学
DNA Repair Pub Date : 2024-06-10 DOI: 10.1016/j.dnarep.2024.103710
Sophie E. Wells, Keith W. Caldecott
{"title":"KBM-mediated interactions with KU80 promote cellular resistance to DNA replication stress in CHO cells","authors":"Sophie E. Wells,&nbsp;Keith W. Caldecott","doi":"10.1016/j.dnarep.2024.103710","DOIUrl":"10.1016/j.dnarep.2024.103710","url":null,"abstract":"<div><p>The KU heterodimer (KU70/80) is rapidly recruited to DNA double-strand breaks (DSBs) to regulate their processing and repair. Previous work has revealed that the amino-terminal von Willebrand-like (vWA-like) domain in KU80 harbours a conserved hydrophobic pocket that interacts with a short peptide motif known as the Ku-binding motif (KBM). The KBM is present in a variety of DNA repair proteins such as APLF, CYREN, and Werner protein (WRN). Here, to investigate the importance of KBM-mediated protein-protein interactions for KU80 function, we employed KU80-deficient Chinese Hamster Ovary (Xrs-6) cells transfected with RFP-tagged wild-type human KU80 or KU80 harbouring a mutant vWA-like domain (KU80<sup>L68R</sup>). Surprisingly, while mutant RFP-KU80<sup>L68R</sup> largely or entirely restored NHEJ efficiency and radiation resistance in KU80-deficient <em>Xrs-6</em> cells, it failed to restore cellular resistance to DNA replication stress induced by camptothecin (CPT) or hydroxyurea (HU). Moreover, KU80-deficient Xrs-6 cells expressing RFP-KU80<sup>L68R</sup> accumulated pan-nuclear γH2AX in an S/G2-phase-dependent manner following treatment with CPT or HU, suggesting that the binding of KU80 to one or more KBM-containing proteins is required for the processing and/or repair of DNA ends that arise during DNA replication stress. Consistent with this idea, depletion of WRN helicase/exonuclease recapitulated the CPT-induced γH2AX phenotype, and did so epistatically with mutation of the KU80 vWA-like domain. These data identify a role for the KBM-binding by KU80 in the response and resistance of CHO cells to arrested and/or collapsed DNA replication forks, and implicate the KBM-mediated interaction of KU80 with WRN as a critical effector of this role.</p></div>","PeriodicalId":300,"journal":{"name":"DNA Repair","volume":"140 ","pages":"Article 103710"},"PeriodicalIF":3.8,"publicationDate":"2024-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1568786424000867/pdfft?md5=c5d3c451037ee3da2b1171cdc1021890&pid=1-s2.0-S1568786424000867-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141396725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
New facets in the chromatin-based regulation of genome maintenance 基于染色质的基因组维护调控的新面貌
IF 3.8 3区 生物学
DNA Repair Pub Date : 2024-06-10 DOI: 10.1016/j.dnarep.2024.103702
Juliette Dabin , Giulia Giacomini , Eliane Petit , Sophie E. Polo
{"title":"New facets in the chromatin-based regulation of genome maintenance","authors":"Juliette Dabin ,&nbsp;Giulia Giacomini ,&nbsp;Eliane Petit ,&nbsp;Sophie E. Polo","doi":"10.1016/j.dnarep.2024.103702","DOIUrl":"https://doi.org/10.1016/j.dnarep.2024.103702","url":null,"abstract":"<div><p>The maintenance of genome integrity by DNA damage response machineries is key to protect cells against pathological development. In cell nuclei, these genome maintenance machineries operate in the context of chromatin, where the DNA wraps around histone proteins. Here, we review recent findings illustrating how the chromatin substrate modulates genome maintenance mechanisms, focusing on the regulatory role of histone variants and post-translational modifications. In particular, we discuss how the pre-existing chromatin landscape impacts DNA damage formation and guides DNA repair pathway choice, and how DNA damage-induced chromatin alterations control DNA damage signaling and repair, and DNA damage segregation through cell divisions. We also highlight that pathological alterations of histone proteins may trigger genome instability by impairing chromosome segregation and DNA repair, thus defining new oncogenic mechanisms and opening up therapeutic options.</p></div>","PeriodicalId":300,"journal":{"name":"DNA Repair","volume":"140 ","pages":"Article 103702"},"PeriodicalIF":3.8,"publicationDate":"2024-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1568786424000788/pdfft?md5=3063801fb46259f44aab835191c0f580&pid=1-s2.0-S1568786424000788-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141325941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Suppressors of Blm-deficiency identify three novel proteins that facilitate DNA repair in Ustilago maydis Blm缺陷抑制因子发现了三种促进Ustilago maydis DNA修复的新型蛋白质
IF 3.8 3区 生物学
DNA Repair Pub Date : 2024-06-08 DOI: 10.1016/j.dnarep.2024.103709
Natalija Azanjac , Mira Milisavljevic , Stefan Stanovcic, Milorad Kojic
{"title":"Suppressors of Blm-deficiency identify three novel proteins that facilitate DNA repair in Ustilago maydis","authors":"Natalija Azanjac ,&nbsp;Mira Milisavljevic ,&nbsp;Stefan Stanovcic,&nbsp;Milorad Kojic","doi":"10.1016/j.dnarep.2024.103709","DOIUrl":"https://doi.org/10.1016/j.dnarep.2024.103709","url":null,"abstract":"<div><p>To identify new molecular components of the Brh2-governed homologous recombination (HR)-network in the highly radiation-resistant fungus <em>Ustilago maydis</em>, we undertook a genetic screen for suppressors of <em>blm-</em><sup><em>KR</em></sup> hydroxyurea (HU)-sensitivity. Twenty DNA-damage sensitive mutants were obtained, three of which showing slow-growth phenotypes. Focusing on the “normally” growing candidates we identified five mutations, two in previously well-defined genes (<em>Rec2</em> and <em>Rad51</em>) and the remaining three in completely uncharacterized genes (named <em>Rec3, Bls9</em> and <em>Zdr1</em>). A common feature among these novel factors is their prominent role in DNA repair. Rec3 contains the P-loop NTPase domain which is most similar to that found in <em>U. maydis</em> Rec2 protein, and like Rec2, Rec3 plays critical roles in induced allelic recombination, is crucial for completion of meiosis, and with regard to DNA repair Δ<em>rec3</em> and Δ<em>rec2</em> are epistatic to one another. Importantly, overexpression of Brh2 in Δ<em>rec3</em> can effectively restore DNA-damage resistance, indicating a close functional connection between Brh2 and Rec3. The Bls9 does not seem to have any convincing domains that would give a clue as to its function. Nevertheless, we present evidence that, besides being involved in DNA-repair, Bls9 is also necessary for HR between chromosome homologs. Moreover, Δ<em>bls9</em> showed epistasis with Δ<em>brh2</em> with respect to killing by DNA-damaging agents. Both, Rec3 and Bls9, play an important role in protecting the genome from mutations. Zdr1 is Cys2-His2 zinc finger (C2H2-ZF) protein, whose loss does not cause a detectable change in HR. Also, the functions of both <em>Bls9</em> and <em>Zdr1</em> genes are dispensable in meiosis and sporulation. However, Zdr1 appears to have overlapping activities with Blm and Mus81 in protecting the organism from methyl methanesulfonate- and diepoxybutane-induced DNA-damage. Finally, while deletion of <em>Rec3</em> and <em>Zdr1</em> can suppress HU-sensitivity of <em>blm-</em><sup><em>KR</em></sup><em>,</em> Δ<em>gen1,</em> and Δ<em>mus81</em> mutants, interestingly loss of Bls9 does not rescue HU-sensitivity of Δ<em>gen1.</em></p></div>","PeriodicalId":300,"journal":{"name":"DNA Repair","volume":"140 ","pages":"Article 103709"},"PeriodicalIF":3.8,"publicationDate":"2024-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141303175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
FANCM branchpoint translocase: Master of traverse, reverse and adverse DNA repair FANCM 支点易位酶:横向、反向和逆向 DNA 修复的主控器
IF 3.8 3区 生物学
DNA Repair Pub Date : 2024-06-04 DOI: 10.1016/j.dnarep.2024.103701
Lara Abbouche , Rohan Bythell-Douglas , Andrew J. Deans
{"title":"FANCM branchpoint translocase: Master of traverse, reverse and adverse DNA repair","authors":"Lara Abbouche ,&nbsp;Rohan Bythell-Douglas ,&nbsp;Andrew J. Deans","doi":"10.1016/j.dnarep.2024.103701","DOIUrl":"https://doi.org/10.1016/j.dnarep.2024.103701","url":null,"abstract":"<div><p>FANCM is a multifunctional DNA repair enzyme that acts as a sensor and coordinator of replication stress responses, especially interstrand crosslink (ICL) repair mediated by the Fanconi anaemia (FA) pathway. Its specialised ability to bind and remodel branched DNA structures enables diverse genome maintenance activities. Through ATP-powered “branchpoint translocation”, FANCM can promote fork reversal, facilitate replication traverse of ICLs, resolve deleterious R-loop structures, and restrain recombination. These remodelling functions also support a role as sensor of perturbed replication, eliciting checkpoint signalling and recruitment of downstream repair factors like the Fanconi anaemia FANCI:FANCD2 complex. Accordingly, FANCM deficiency causes chromosome fragility and cancer susceptibility. Other recent advances link FANCM to roles in gene editing efficiency and meiotic recombination, along with emerging synthetic lethal relationships, and targeting opportunities in ALT-positive cancers. Here we review key properties of FANCM's biochemical activities, with a particular focus on branchpoint translocation as a distinguishing characteristic.</p></div>","PeriodicalId":300,"journal":{"name":"DNA Repair","volume":"140 ","pages":"Article 103701"},"PeriodicalIF":3.8,"publicationDate":"2024-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141325940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Oncometabolite 2-hydroxyglutarate suppresses basal protein levels of DNA polymerase beta that enhances alkylating agent and PARG inhibition induced cytotoxicity 肿瘤代谢物 2-hydroxyglutarate 可抑制 DNA 聚合酶 beta 的基础蛋白水平,从而增强烷化剂和 PARG 抑制剂诱导的细胞毒性
IF 3.8 3区 生物学
DNA Repair Pub Date : 2024-06-04 DOI: 10.1016/j.dnarep.2024.103700
Kate M. Saville , Rasha Q. Al-Rahahleh , Aisha H. Siddiqui , Morgan E. Andrews , Wynand P. Roos , Christopher A. Koczor , Joel F. Andrews , Faisal Hayat , Marie E. Migaud , Robert W. Sobol
{"title":"Oncometabolite 2-hydroxyglutarate suppresses basal protein levels of DNA polymerase beta that enhances alkylating agent and PARG inhibition induced cytotoxicity","authors":"Kate M. Saville ,&nbsp;Rasha Q. Al-Rahahleh ,&nbsp;Aisha H. Siddiqui ,&nbsp;Morgan E. Andrews ,&nbsp;Wynand P. Roos ,&nbsp;Christopher A. Koczor ,&nbsp;Joel F. Andrews ,&nbsp;Faisal Hayat ,&nbsp;Marie E. Migaud ,&nbsp;Robert W. Sobol","doi":"10.1016/j.dnarep.2024.103700","DOIUrl":"10.1016/j.dnarep.2024.103700","url":null,"abstract":"<div><p>Mutations in isocitrate dehydrogenase isoform 1 (<em>IDH1</em>) are primarily found in secondary glioblastoma (GBM) and low-grade glioma but are rare in primary GBM. The standard treatment for GBM includes radiation combined with temozolomide, an alkylating agent. Fortunately, <em>IDH1</em> mutant gliomas are sensitive to this treatment, resulting in a more favorable prognosis. However, it’s estimated that up to 75 % of <em>IDH1</em> mutant gliomas will progress to WHO grade IV over time and develop resistance to alkylating agents. Therefore, understanding the mechanism(s) by which <em>IDH1</em> mutant gliomas confer sensitivity to alkylating agents is crucial for developing targeted chemotherapeutic approaches. The base excision repair (BER) pathway is responsible for repairing most base damage induced by alkylating agents. Defects in this pathway can lead to hypersensitivity to these agents due to unresolved DNA damage. The coordinated assembly and disassembly of BER protein complexes are essential for cell survival and for maintaining genomic integrity following alkylating agent exposure. These complexes rely on poly-ADP-ribose formation, an NAD<sup>+</sup>-dependent post-translational modification synthesized by PARP1 and PARP2 during the BER process. At the lesion site, poly-ADP-ribose facilitates the recruitment of XRCC1. This scaffold protein helps assemble BER proteins like DNA polymerase beta (Polβ), a bifunctional DNA polymerase containing both DNA synthesis and 5′-deoxyribose-phosphate lyase (5’dRP lyase) activity. Here, we confirm that <em>IDH1</em> mutant glioma cells have defective NAD<sup>+</sup> metabolism, but still produce sufficient nuclear NAD<sup>+</sup> for robust PARP1 activation and BER complex formation in response to DNA damage. However, the overproduction of 2-hydroxyglutarate, an oncometabolite produced by the IDH1 R132H mutant protein, suppresses BER capacity by reducing Polβ protein levels. This defines a novel mechanism by which the <em>IDH1</em> mutation in gliomas confers cellular sensitivity to alkylating agents and to inhibitors of the poly-ADP-ribose glycohydrolase, PARG.</p></div>","PeriodicalId":300,"journal":{"name":"DNA Repair","volume":"140 ","pages":"Article 103700"},"PeriodicalIF":3.8,"publicationDate":"2024-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1568786424000764/pdfft?md5=fc195a6932bb7fa0a5e50e382cb46ee6&pid=1-s2.0-S1568786424000764-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141397015","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Broken strands, broken minds: Exploring the nexus of DNA damage and neurodegeneration 断裂的链,破碎的心:探索 DNA 损伤与神经变性之间的联系
IF 3.8 3区 生物学
DNA Repair Pub Date : 2024-06-03 DOI: 10.1016/j.dnarep.2024.103699
Ioanna Stavgiannoudaki , Evi Goulielmaki , George A. Garinis
{"title":"Broken strands, broken minds: Exploring the nexus of DNA damage and neurodegeneration","authors":"Ioanna Stavgiannoudaki ,&nbsp;Evi Goulielmaki ,&nbsp;George A. Garinis","doi":"10.1016/j.dnarep.2024.103699","DOIUrl":"10.1016/j.dnarep.2024.103699","url":null,"abstract":"<div><p>Neurodegenerative disorders are primarily characterized by neuron loss progressively leading to cognitive decline and the manifestation of incurable and debilitating conditions, such as Alzheimer's, Parkinson's, and Huntington's diseases. Loss of genome maintenance causally contributes to age-related neurodegeneration, as exemplified by the premature appearance of neurodegenerative features in a growing family of human syndromes and mice harbouring inborn defects in DNA repair. Here, we discuss the relevance of persistent DNA damage, key DNA repair mechanisms and compromised genome integrity in age-related neurodegeneration highlighting the significance of investigating these connections to pave the way for the development of rationalized intervention strategies aimed at delaying the onset of neurodegenerative disorders and promoting healthy aging.</p></div>","PeriodicalId":300,"journal":{"name":"DNA Repair","volume":"140 ","pages":"Article 103699"},"PeriodicalIF":3.8,"publicationDate":"2024-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141274326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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