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Barua D, Płecha M, Muszewska A. A minimal Fanconi Anemia complex in early diverging fungi. Sci Rep 2024; 14:9922. [PMID: 38688950 PMCID: PMC11061109 DOI: 10.1038/s41598-024-60318-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2024] [Accepted: 04/22/2024] [Indexed: 05/02/2024] Open
Abstract
Fanconi Anemia (FA) pathway resolves DNA interstrand cross links (ICL). The FA pathway was initially recognized in vertebrates, but was later confirmed in other animals and speculated in fungi. FA proteins FANCM, FANCL and FANCJ are present in Saccharomyces cerevisiae but, their mechanism of interaction to resolve ICL is still unclear. Unlike Dikarya, early diverging fungi (EDF) possess more traits shared with animals. We traced the evolutionary history of the FA pathway across Opisthokonta. We scanned complete proteomes for FA-related homologs to establish their taxonomic distribution and analyzed their phylogenetic trees. We checked transcription profiles of FA genes to test if they respond to environmental conditions and their genomic localizations for potential co-localization. We identified fungal homologs of the activation and ID complexes, 5 out of 8 core proteins, all of the endonucleases, and deubiquitination proteins. All fungi lack FANCC, FANCF and FANCG proteins responsible for post-replication repair and chromosome stability in animals. The observed taxonomic distribution can be attributed to a gradual degradation of the FA pathway from EDF to Dikarya. One of the key differences is that EDF have the ID complex recruiting endonucleases to the site of ICL. Moreover, 21 out of 32 identified FA genes are upregulated in response to different growth conditions. Several FA genes are co-localized in fungal genomes which also could facilitate co-expression. Our results indicate that a minimal FA pathway might still be functional in Mucoromycota with a gradual loss of components in Dikarya ancestors.
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Affiliation(s)
- Drishtee Barua
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5A, 02-106, Warsaw, Poland
| | - Magdalena Płecha
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5A, 02-106, Warsaw, Poland
| | - Anna Muszewska
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5A, 02-106, Warsaw, Poland.
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Berrada S, Martínez-Balsalobre E, Larcher L, Azzoni V, Vasquez N, Da Costa M, Abel S, Audoly G, Lee L, Montersino C, Castellano R, Combes S, Gelot C, Ceccaldi R, Guervilly JH, Soulier J, Lachaud C. A clickable melphalan for monitoring DNA interstrand crosslink accumulation and detecting ICL repair defects in Fanconi anemia patient cells. Nucleic Acids Res 2023; 51:7988-8004. [PMID: 37395445 PMCID: PMC10450163 DOI: 10.1093/nar/gkad559] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2022] [Revised: 06/14/2023] [Accepted: 06/21/2023] [Indexed: 07/04/2023] Open
Abstract
Fanconi anemia (FA) is a genetic disorder associated with developmental defects, bone marrow failure and cancer. The FA pathway is crucial for the repair of DNA interstrand crosslinks (ICLs). In this study, we have developed and characterized a new tool to investigate ICL repair: a clickable version of the crosslinking agent melphalan which we name click-melphalan. Our results demonstrate that click-melphalan is as effective as its unmodified counterpart in generating ICLs and associated toxicity. The lesions induced by click-melphalan can be detected in cells by post-labelling with a fluorescent reporter and quantified using flow cytometry. Since click-melphalan induces both ICLs and monoadducts, we generated click-mono-melphalan, which only induces monoadducts, in order to distinguish between the two types of DNA repair. By using both molecules, we show that FANCD2 knock-out cells are deficient in removing click-melphalan-induced lesions. We also found that these cells display a delay in repairing click-mono-melphalan-induced monoadducts. Our data further revealed that the presence of unrepaired ICLs inhibits monoadduct repair. Finally, our study demonstrates that these clickable molecules can differentiate intrinsic DNA repair deficiencies in primary FA patient cells from those in primary xeroderma pigmentosum patient cells. As such, these molecules may have potential for developing diagnostic tests.
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Affiliation(s)
- Sara Berrada
- Aix-Marseille Univ, INSERM, CNRS, Institut Paoli-Calmettes, CRCM, Marseille, France
| | | | - Lise Larcher
- University Paris Cité, Institut de Recherche Saint-Louis, INSERM U944, and CNRS UMR7212, Paris, France
- Laboratoire de biologie médicale de référence (LBMR) “Aplastic anemia”, Service d’Hématologie biologique, Hôpital Saint-Louis, Assistance Publique Hôpitaux de Paris, Paris, France
| | - Violette Azzoni
- Aix-Marseille Univ, INSERM, CNRS, Institut Paoli-Calmettes, CRCM, Marseille, France
| | - Nadia Vasquez
- University Paris Cité, Institut de Recherche Saint-Louis, INSERM U944, and CNRS UMR7212, Paris, France
- Laboratoire de biologie médicale de référence (LBMR) “Aplastic anemia”, Service d’Hématologie biologique, Hôpital Saint-Louis, Assistance Publique Hôpitaux de Paris, Paris, France
| | - Mélanie Da Costa
- University Paris Cité, Institut de Recherche Saint-Louis, INSERM U944, and CNRS UMR7212, Paris, France
- Laboratoire de biologie médicale de référence (LBMR) “Aplastic anemia”, Service d’Hématologie biologique, Hôpital Saint-Louis, Assistance Publique Hôpitaux de Paris, Paris, France
| | - Sébastien Abel
- Aix-Marseille Univ, INSERM, CNRS, Institut Paoli-Calmettes, CRCM, Marseille, France
| | - Gilles Audoly
- Aix-Marseille Univ, INSERM, CNRS, Institut Paoli-Calmettes, CRCM, Marseille, France
| | - Lara Lee
- Aix-Marseille Univ, INSERM, CNRS, Institut Paoli-Calmettes, CRCM, Marseille, France
| | - Camille Montersino
- Aix-Marseille Univ, INSERM, CNRS, Institut Paoli-Calmettes, CRCM, Marseille, France
| | - Rémy Castellano
- Aix-Marseille Univ, INSERM, CNRS, Institut Paoli-Calmettes, CRCM, Marseille, France
| | - Sébastien Combes
- Aix-Marseille Univ, INSERM, CNRS, Institut Paoli-Calmettes, CRCM, Marseille, France
| | - Camille Gelot
- Inserm U830, PSL Research University, Institut Curie, Paris, France
| | - Raphaël Ceccaldi
- Inserm U830, PSL Research University, Institut Curie, Paris, France
| | | | - Jean Soulier
- University Paris Cité, Institut de Recherche Saint-Louis, INSERM U944, and CNRS UMR7212, Paris, France
- Laboratoire de biologie médicale de référence (LBMR) “Aplastic anemia”, Service d’Hématologie biologique, Hôpital Saint-Louis, Assistance Publique Hôpitaux de Paris, Paris, France
| | - Christophe Lachaud
- Aix-Marseille Univ, INSERM, CNRS, Institut Paoli-Calmettes, CRCM, Marseille, France
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Ashraf W, Ahmad T, Reynoird N, Hamiche A, Mély Y, Bronner C, Mousli M. Natural and Synthetic Anticancer Epidrugs Targeting the Epigenetic Integrator UHRF1. Molecules 2023; 28:5997. [PMID: 37630248 PMCID: PMC10459542 DOI: 10.3390/molecules28165997] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2023] [Revised: 08/06/2023] [Accepted: 08/08/2023] [Indexed: 08/27/2023] Open
Abstract
Cancer is one of the leading causes of death worldwide, and its incidence and mortality are increasing each year. Improved therapeutic strategies against cancer have progressed, but remain insufficient to invert this trend. Along with several other risk factors, abnormal genetic and epigenetic regulations play a critical role in the initiation of cellular transformation, as well as tumorigenesis. The epigenetic regulator UHRF1 (ubiquitin-like, containing PHD and RING finger domains 1) is a multidomain protein with oncogenic abilities overexpressed in most cancers. Through the coordination of its multiple domains and other epigenetic key players, UHRF1 regulates DNA methylation and histone modifications. This well-coordinated dialogue leads to the silencing of tumor-suppressor genes (TSGs) and facilitates tumor cells' resistance toward anticancer drugs, ultimately promoting apoptosis escape and uncontrolled proliferation. Several studies have shown that the downregulation of UHRF1 with natural compounds in tumor cells induces the reactivation of various TSGs, inhibits cell growth, and promotes apoptosis. In this review, we discuss the underlying mechanisms and the potential of various natural and synthetic compounds that can inhibit/minimize UHRF1's oncogenic activities and/or its expression.
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Affiliation(s)
- Waseem Ashraf
- Department of Pharmacology, Faculty of Pharmacy, Bahauddin Zakariya University, Multan 60800, Pakistan;
| | - Tanveer Ahmad
- Institut Pour L’avancée des Biosciences, Centre de Recherche UGA, INSERM U1209, CNRS 5309, Université Grenoble Alpes, 38058 Grenoble, France; (T.A.); (N.R.)
| | - Nicolas Reynoird
- Institut Pour L’avancée des Biosciences, Centre de Recherche UGA, INSERM U1209, CNRS 5309, Université Grenoble Alpes, 38058 Grenoble, France; (T.A.); (N.R.)
| | - Ali Hamiche
- Department of Functional Genomics, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), INSERM U1258, CNRS UMR 7104, Université de Strasbourg, Equipe Labellisée Ligue Contre le Cancer, 67401 Illkirch, France;
| | - Yves Mély
- Laboratoire de Bioimagerie et Pathologies, UMR 7021 CNRS, Faculté de Pharmacie, Université de Strasbourg, 67401 Illkirch, France;
| | - Christian Bronner
- Department of Functional Genomics, Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), INSERM U1258, CNRS UMR 7104, Université de Strasbourg, Equipe Labellisée Ligue Contre le Cancer, 67401 Illkirch, France;
| | - Marc Mousli
- Laboratoire de Bioimagerie et Pathologies, UMR 7021 CNRS, Faculté de Pharmacie, Université de Strasbourg, 67401 Illkirch, France;
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Wang X, Sarver AL, Han Q, Seiler CL, Xie C, Lu H, Forster CL, Tretyakova NY, Hallstrom TC. UHRF2 regulates cell cycle, epigenetics and gene expression to control the timing of retinal progenitor and ganglion cell differentiation. Development 2022; 149:274710. [PMID: 35285483 PMCID: PMC8984156 DOI: 10.1242/dev.195644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2020] [Accepted: 01/28/2022] [Indexed: 11/20/2022]
Abstract
Ubiquitin-like, containing PHD and RING finger domains 2 (UHRF2) regulates cell cycle and binds 5-hydroxymethylcytosine (5hmC) to promote completion of DNA demethylation. Uhrf2-/- mice are without gross phenotypic defects; however, the cell cycle and epigenetic regulatory functions of Uhrf2 during retinal tissue development are unclear. Retinal progenitor cells (RPCs) produce all retinal neurons and Müller glia in a predictable sequence controlled by the complex interplay between extrinsic signaling, cell cycle, epigenetic changes and cell-specific transcription factor activation. In this study, we find that UHRF2 accumulates in RPCs, and its conditional deletion from mouse RPCs reduced 5hmC, altered gene expressions and disrupted retinal cell proliferation and differentiation. Retinal ganglion cells were overproduced in Uhrf2-deficient retinae at the expense of VSX2+ RPCs. Most other cell types were transiently delayed in differentiation. Expression of each member of the Tet3/Uhrf2/Tdg active demethylation pathway was reduced in Uhrf2-deficient retinae, consistent with locally reduced 5hmC in their gene bodies. This study highlights a novel role of UHRF2 in controlling the transition from RPCs to differentiated cell by regulating cell cycle, epigenetic and gene expression decisions.
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Affiliation(s)
- Xiaohong Wang
- Department of Pediatrics, Division of Blood and Marrow Transplantation, 420 Delaware Street S.E., University of Minnesota, Minneapolis, MN 55455, USA
| | - Aaron L Sarver
- Institute for Health Informatics, Masonic Cancer Center, University of Minnesota, Minneapolis, MN 55455, USA
| | - Qiyuan Han
- Department of Medicinal Chemistry, University of Minnesota, Minneapolis, MN 55455, USA
| | - Christopher L Seiler
- Department of Medicinal Chemistry, University of Minnesota, Minneapolis, MN 55455, USA
| | - Chencheng Xie
- Department of Pediatrics, Division of Blood and Marrow Transplantation, 420 Delaware Street S.E., University of Minnesota, Minneapolis, MN 55455, USA
| | - Huarui Lu
- Department of Pediatrics, Division of Blood and Marrow Transplantation, 420 Delaware Street S.E., University of Minnesota, Minneapolis, MN 55455, USA
| | - Colleen L Forster
- BioNet, Academic Health Center, University of Minnesota, Minneapolis, MN 55455, USA
| | - Natalia Y Tretyakova
- Department of Medicinal Chemistry, University of Minnesota, Minneapolis, MN 55455, USA
| | - Timothy C Hallstrom
- Department of Pediatrics, Division of Blood and Marrow Transplantation, 420 Delaware Street S.E., University of Minnesota, Minneapolis, MN 55455, USA
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Khan NH, Chen HJ, Fan Y, Surfaraz M, Ahammad MD, Qin YZ, Shahid M, Virk R, Jiang E, Wu DD, Ji XY. Biology of PEST‐Containing Nuclear Protein: A Potential Molecular Target for Cancer Research. Front Oncol 2022; 12:784597. [PMID: 35186732 PMCID: PMC8855108 DOI: 10.3389/fonc.2022.784597] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Accepted: 01/06/2022] [Indexed: 11/24/2022] Open
Abstract
PEST-containing nuclear protein (PCNP), a novel nuclear protein, is involved in vital cellular processes like cell proliferation and mediates tumorigenesis. PCNP is a short-living, small nuclear protein of only 178 amino acids with two remarkable PEST sequences that are rich in proline (P), glutamic acid (E), serine (S), and threonine (T). The current understanding of PCNP reveals that PCNP has the ability to interact with cell cycle regulatory proteins; tumor suppressors (p53 and pRB), and promoters (cyclin E and cyclin D) to determine the fate of tissues to facilitate the process of either apoptosis or cell proliferation. In many preclinical studies, it has been evaluated that PCNP expression has associations with the development and progression of various cancers like neuroblastoma, lung adenocarcinoma, and ovarian cancer. Based on these depicted novel roles of PCNP in cell cycleregulation and of PCNP in tumorigenesis, it is logical to consider PCNP as a potential molecular target for cancer research. The aim of the current communication is to present an update on PCNP research and discussion on the potential role of PCNP in cancer development with challenges and opportunities perspectives. Considering the available evidence as a baseline for our statement, we anticipate that in the future, new research insights will strengthen the aim to develop PCNP-based diagnostic and therapeutic approaches that will move the PCNP from the laboratory to the cancer clinic.
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Affiliation(s)
- Nazeer Hussain Khan
- Henan International Joint Laboratory for Nuclear Protein Regulation, School of Basic Medical Sciences, Henan University, Kaifeng, China
- School of Life Sciences, Henan University, Kaifeng, China
| | - Hao-Jie Chen
- Henan International Joint Laboratory for Nuclear Protein Regulation, School of Basic Medical Sciences, Henan University, Kaifeng, China
| | - Yuanyuan Fan
- School of Life Sciences, Henan University, Kaifeng, China
| | | | - MD.Faysal Ahammad
- Key Laboratory of Natural Medicine and Immune Engineering, School of Medicine, Henan University, Kaifeng, China
| | - Yang-Zhe Qin
- Henan International Joint Laboratory for Nuclear Protein Regulation, School of Basic Medical Sciences, Henan University, Kaifeng, China
| | - Muhammad Shahid
- Department of Biological Sciences and Biotechnology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, Bangi, Malaysia
| | - Razia Virk
- Department of Bio-Sciences, University Wah, Rawalpindi, Pakistan
| | - Enshe Jiang
- Henan International Joint Laboratory for Nuclear Protein Regulation, School of Basic Medical Sciences, Henan University, Kaifeng, China
- Institute of Nursing and Health, Henan University, Kaifeng, China
- *Correspondence: Enshe Jiang, ; Dong-Dong Wu, ; Xin-Ying Ji,
| | - Dong-Dong Wu
- Henan International Joint Laboratory for Nuclear Protein Regulation, School of Basic Medical Sciences, Henan University, Kaifeng, China
- School of Stomatology, Henan University, Kaifeng, China
- *Correspondence: Enshe Jiang, ; Dong-Dong Wu, ; Xin-Ying Ji,
| | - Xin-Ying Ji
- Henan International Joint Laboratory for Nuclear Protein Regulation, School of Basic Medical Sciences, Henan University, Kaifeng, China
- Kaifeng Key Laboratory of Infection and Biological Safety, Henan University College of Medicine, Kaifeng, China
- *Correspondence: Enshe Jiang, ; Dong-Dong Wu, ; Xin-Ying Ji,
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Hu CM, Peng J, Lv L, Wang XH, Huo JR, Liu DL. MiR-196a promotes the proliferation and migration of esophageal cancer via the UHRF2/TET2 axis. Mol Cell Biochem 2022; 477:537-547. [PMID: 34826027 DOI: 10.1007/s11010-021-04301-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2021] [Accepted: 11/08/2021] [Indexed: 12/19/2022]
Abstract
The aim of this study was to investigate the functions and molecular mechanism of miR-196a in esophageal cancer (EC). miR-196a as well as UHRF2 and TET2 mRNA and protein levels in EC tissues and cells were detected using quantitative real-time PCR or western blot, respectively. Cell proliferation was evaluated via MTT assay. Transwell assays were used to detect cell migration. In addition, the targeted relationship between miR-196a and UHRF2 was assessed through a dual luciferase reporter assay. Enzyme-linked immunosorbent assay was performed to detect the levels of the cytosine intermediates 5-methylcytosine (5mC) and 5-hydroxymethylcytosine (5hmC). We found increased miR-196a expression in EC tissues and cells but decreased UHRF2 and TET2 expression. Next, functional experiments showed that knockdown of miR-196a or UHRF2 overexpression suppress EC cell proliferation and migration. miR-196a negatively regulates TET2 expression by directly targeting UHRF2. UHRF2 overexpression decreased 5mC levels but increased 5hmC levels. Furthermore, TET2 downregulation reversed the functions of miR-196a inhibition on EC cell proliferation and migration. Collectively, our study suggested that miR-196a was closely related to the progression of EC possibly by regulating the UHRF2/TET2 axis. Thus, miR-196a represents a potential new EC therapeutic target.
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Affiliation(s)
- Chang-Mei Hu
- Department of Gastroenterology, Second Xiangya Hospital, Central South University, No. 139, Mid RenMin Rd., Changsha, 410011, Hunan Province, People's Republic of China.
| | - Jie Peng
- Department of Haematology, Xiangya Hospital, Central South University, Changsha, 410078, Hunan Province, People's Republic of China
| | - Liang Lv
- Department of Gastroenterology, Second Xiangya Hospital, Central South University, No. 139, Mid RenMin Rd., Changsha, 410011, Hunan Province, People's Republic of China
| | - Xue-Hong Wang
- Department of Gastroenterology, Second Xiangya Hospital, Central South University, No. 139, Mid RenMin Rd., Changsha, 410011, Hunan Province, People's Republic of China
| | - Ji-Rong Huo
- Department of Gastroenterology, Second Xiangya Hospital, Central South University, No. 139, Mid RenMin Rd., Changsha, 410011, Hunan Province, People's Republic of China
| | - De-Liang Liu
- Department of Gastroenterology, Second Xiangya Hospital, Central South University, No. 139, Mid RenMin Rd., Changsha, 410011, Hunan Province, People's Republic of China
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UNOKI M, SASAKI H. The UHRF protein family in epigenetics, development, and carcinogenesis. Proc Jpn Acad Ser B Phys Biol Sci 2022; 98:401-415. [PMID: 36216533 PMCID: PMC9614205 DOI: 10.2183/pjab.98.021] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Accepted: 06/14/2022] [Indexed: 05/31/2023]
Abstract
The UHRF protein family consists of multidomain regulatory proteins that sense modification status of DNA and/or proteins and catalyze the ubiquitylation of target proteins. Through their functional domains, they interact with other molecules and serve as a hub for regulatory networks of several important biological processes, including maintenance of DNA methylation and DNA damage repair. The UHRF family is conserved in vertebrates and plants but is missing from fungi and many nonvertebrate animals. Mammals commonly have UHRF1 and UHRF2, but, despite their high structural similarity, the two paralogues appear to have distinct functions. Furthermore, UHRF1 and UHRF2 show different expression patterns and different outcomes in gene knockout experiments. In this review, we summarize the current knowledge on the molecular function of the UHRF family in various biological pathways and discuss their roles in epigenetics, development, gametogenesis, and carcinogenesis, with a focus on the mammalian UHRF proteins.
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Affiliation(s)
- Motoko UNOKI
- Division of Epigenomics and Development, Medical Institute of Bioregulation, Kyushu University, Fukuoka, Japan
- Department of Human Genetics, School of International Health, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Hiroyuki SASAKI
- Division of Epigenomics and Development, Medical Institute of Bioregulation, Kyushu University, Fukuoka, Japan
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Katsuki Y, Abe M, Park SY, Wu W, Yabe H, Yabe M, van Attikum H, Nakada S, Ohta T, Seidman MM, Kim Y, Takata M. RNF168 E3 ligase participates in ubiquitin signaling and recruitment of SLX4 during DNA crosslink repair. Cell Rep 2021; 37:109879. [PMID: 34706224 DOI: 10.1016/j.celrep.2021.109879] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2020] [Revised: 03/24/2021] [Accepted: 10/01/2021] [Indexed: 12/11/2022] Open
Abstract
SLX4/FANCP is a key Fanconi anemia (FA) protein and a DNA repair scaffold for incision around a DNA interstrand crosslink (ICL) by its partner XPF nuclease. The tandem UBZ4 ubiquitin-binding domains of SLX4 are critical for the recruitment of SLX4 to damage sites, likely by binding to K63-linked polyubiquitin chains. However, the identity of the ubiquitin E3 ligase that mediates SLX4 recruitment remains unknown. Using small interfering RNA (siRNA) screening with a GFP-tagged N-terminal half of SLX4 (termed SLX4-N), we identify the RNF168 E3 ligase as a critical factor for mitomycin C (MMC)-induced SLX4 foci formation. RNF168 and GFP-SLX4-N colocalize in MMC-induced ubiquitin foci. Accumulation of SLX4-N at psoralen-laser ICL tracks or of endogenous SLX4 at Digoxigenin-psoralen/UVA ICL is dependent on RNF168. Finally, we find that RNF168 is epistatic with SLX4 in promoting MMC tolerance. We conclude that RNF168 is a critical component of the signal transduction that recruits SLX4 to ICL damage.
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Affiliation(s)
- Yoko Katsuki
- Laboratory of DNA Damage Signaling, Department of Late Effects Studies, Radiation Biology Center, Graduate School of Biostudies, Kyoto University, Kyoto, Japan.
| | - Masako Abe
- The Core Facility, Radiation Biology Center, Graduate School of Biostudies, Kyoto University, Kyoto, Japan
| | - Seon Young Park
- Department of Biological Sciences, Sookmyung Women's University, Seoul, Republic of Korea
| | - Wenwen Wu
- Department of Translational Oncology, St. Marianna University Graduate School of Medicine, Kawasaki, Japan
| | - Hiromasa Yabe
- Department of Innovative Medical Science, Tokai University School of Medicine, Isehara, Japan
| | - Miharu Yabe
- Department of Innovative Medical Science, Tokai University School of Medicine, Isehara, Japan
| | - Haico van Attikum
- Department of Human Genetics, Leiden University Medical Center, Leiden, the Netherlands
| | - Shinichiro Nakada
- Department of Bioregulation and Cellular Response, Graduate School of Medicine, Osaka University, Osaka, Japan; Institute for Advanced Co-Creation Studies, Osaka University, Osaka, Japan
| | - Tomohiko Ohta
- Department of Translational Oncology, St. Marianna University Graduate School of Medicine, Kawasaki, Japan
| | - Michael M Seidman
- Laboratory of Molecular Biology and Immunology, National Institute on Aging, National Institutes of Health, Baltimore, MD, USA
| | - Yonghwan Kim
- Department of Biological Sciences, Sookmyung Women's University, Seoul, Republic of Korea
| | - Minoru Takata
- Laboratory of DNA Damage Signaling, Department of Late Effects Studies, Radiation Biology Center, Graduate School of Biostudies, Kyoto University, Kyoto, Japan.
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Mancini M, Magnani E, Macchi F, Bonapace IM. The multi-functionality of UHRF1: epigenome maintenance and preservation of genome integrity. Nucleic Acids Res 2021; 49:6053-6068. [PMID: 33939809 PMCID: PMC8216287 DOI: 10.1093/nar/gkab293] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2020] [Revised: 04/02/2021] [Accepted: 04/12/2021] [Indexed: 12/23/2022] Open
Abstract
During S phase, the cooperation between the macromolecular complexes regulating DNA synthesis, epigenetic information maintenance and DNA repair is advantageous for cells, as they can rapidly detect DNA damage and initiate the DNA damage response (DDR). UHRF1 is a fundamental epigenetic regulator; its ability to coordinate DNA methylation and histone code is unique across proteomes of different species. Recently, UHRF1’s role in DNA damage repair has been explored and recognized to be as important as its role in maintaining the epigenome. UHRF1 is a sensor for interstrand crosslinks and a determinant for the switch towards homologous recombination in the repair of double-strand breaks; its loss results in enhanced sensitivity to DNA damage. These functions are finely regulated by specific post-translational modifications and are mediated by the SRA domain, which binds to damaged DNA, and the RING domain. Here, we review recent studies on the role of UHRF1 in DDR focusing on how it recognizes DNA damage and cooperates with other proteins in its repair. We then discuss how UHRF1’s epigenetic abilities in reading and writing histone modifications, or its interactions with ncRNAs, could interlace with its role in DDR.
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Affiliation(s)
- Monica Mancini
- Department of Biotechnology and Life Sciences, University of Insubria, Busto Arsizio, VA 21052, Italy
| | - Elena Magnani
- Program in Biology, New York University Abu Dhabi, Abu Dhabi, PO Box 129188, United Arab Emirates
| | - Filippo Macchi
- Program in Biology, New York University Abu Dhabi, Abu Dhabi, PO Box 129188, United Arab Emirates
| | - Ian Marc Bonapace
- Department of Biotechnology and Life Sciences, University of Insubria, Busto Arsizio, VA 21052, Italy
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Li Q, Dudás K, Tick G, Haracska L. Coordinated Cut and Bypass: Replication of Interstrand Crosslink-Containing DNA. Front Cell Dev Biol 2021; 9:699966. [PMID: 34262911 PMCID: PMC8275186 DOI: 10.3389/fcell.2021.699966] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2021] [Accepted: 06/07/2021] [Indexed: 12/28/2022] Open
Abstract
DNA interstrand crosslinks (ICLs) are covalently bound DNA lesions, which are commonly induced by chemotherapeutic drugs, such as cisplatin and mitomycin C or endogenous byproducts of metabolic processes. This type of DNA lesion can block ongoing RNA transcription and DNA replication and thus cause genome instability and cancer. Several cellular defense mechanism, such as the Fanconi anemia pathway have developed to ensure accurate repair and DNA replication when ICLs are present. Various structure-specific nucleases and translesion synthesis (TLS) polymerases have come into focus in relation to ICL bypass. Current models propose that a structure-specific nuclease incision is needed to unhook the ICL from the replication fork, followed by the activity of a low-fidelity TLS polymerase enabling replication through the unhooked ICL adduct. This review focuses on how, in parallel with the Fanconi anemia pathway, PCNA interactions and ICL-induced PCNA ubiquitylation regulate the recruitment, substrate specificity, activity, and coordinated action of certain nucleases and TLS polymerases in the execution of stalled replication fork rescue via ICL bypass.
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Affiliation(s)
- Qiuzhen Li
- HCEMM-BRC Mutagenesis and Carcinogenesis Research Group, Institute of Genetics, Biological Research Centre, Szeged, Hungary
| | - Kata Dudás
- HCEMM-BRC Mutagenesis and Carcinogenesis Research Group, Institute of Genetics, Biological Research Centre, Szeged, Hungary
| | - Gabriella Tick
- Mutagenesis and Carcinogenesis Research Group, Institute of Genetics, Biological Research Centre, Szeged, Hungary
| | - Lajos Haracska
- HCEMM-BRC Mutagenesis and Carcinogenesis Research Group, Institute of Genetics, Biological Research Centre, Szeged, Hungary
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11
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Sun J, Wu K, Chen S, Jiang S, Chen Y, Duan C. UHRF2 promotes Hepatocellular Carcinoma Progression by Upregulating ErbB3/Ras/Raf Signaling Pathway. Int J Med Sci 2021; 18:3097-3105. [PMID: 34400880 PMCID: PMC8364466 DOI: 10.7150/ijms.60030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/03/2021] [Accepted: 06/17/2021] [Indexed: 01/18/2023] Open
Abstract
Emerging evidence revealed that UHRF2 was implicated in a variety of human diseases, especially in cancer. However, the biological function, clinical significance and underly mechanisms of UHRF2 in hepatocellular carcinoma (HCC) is largely unknown. We analyzed the expression of UHRF2 in 371 HCC tissues and 50 para-cancerous tissues of TCGA database. We found that UHRF2 was significantly upregulated in HCC tissues, which was further confirmed in HCC cells and tissues by western blot. More importantly, the level of UHRF2 was correlated with pathological grade and clinical stage, and the patients with high level of UHRF2 had lower overall survival, disease-free survival and higher recurrence rate than those with low UHRF2 level. Univariate and multivariate Cox regression analysis revealed that high level of UHRF2 might be an independent prognostic factor for HCC patients. Functional investigations suggested that ectopic expression of UHRF2 could promote the proliferation, migration and invasion of HCC cell lines, whereas knock down of UHRF2 exhibited an opposite effect. Additionally, gene set enrichment analysis indicated that ERBB signaling pathway was upregulated in patients with high level of UHRF2. Pearson correlation analysis indicated that the expression of UHRF2 was positively correlated with ErbB3 and its downstream targets SOS1, Ras and Raf-1. Furthermore, we found that overexpression of UHRF2 could upregulate the expression of ErbB3, SOS1, Ras and Raf-1. Our findings suggested that UHRF2 might accelerate HCC progression by upregulating ErbB3/Ras/Raf signaling pathway and it might serve as a diagnostic marker and therapeutic target for HCC patients.
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Affiliation(s)
- Jingjie Sun
- Department of Cell Biology and Genetics, Chongqing Medical University, #1 Yixueyuan Road, Chongqing 400016, China
| | - Kejia Wu
- Department of Cell Biology and Genetics, Chongqing Medical University, #1 Yixueyuan Road, Chongqing 400016, China
| | - Siyuan Chen
- Department of Cell Biology and Genetics, Chongqing Medical University, #1 Yixueyuan Road, Chongqing 400016, China
| | - Shiming Jiang
- Department of Hepatobiliary Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing Medical University, Chongqing 400000, China
| | - Yong Chen
- Department of Hepatobiliary Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing Medical University, Chongqing 400000, China
| | - Changzhu Duan
- Department of Cell Biology and Genetics, Chongqing Medical University, #1 Yixueyuan Road, Chongqing 400016, China
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12
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Hanaki S, Habara M, Shimada M. UV-induced activation of ATR is mediated by UHRF2. Genes Cells 2021; 26:447-454. [PMID: 33848395 DOI: 10.1111/gtc.12851] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 04/09/2021] [Accepted: 04/09/2021] [Indexed: 11/27/2022]
Abstract
UHRF1 (Ubiquitin-like with PHD and ring finger domains 1) regulates DNA methylation and histone modifications and plays a key role in cell proliferation and the DNA damage response. However, the function of UHRF2, a paralog of UHRF1, in the DNA damage response remains largely unknown. Here, we show that UHRF2 is essential for maintaining cell viability after UV irradiation, as well as for the proliferation of cancer cells. UHRF2 was found to physically interact with ATR in a DNA damage-dependent manner through UHRF2's TTD domain. In addition, phosphorylation of threonine at position 1989, which is required for UV-induced activation of ATR, was impaired in cells depleted of UHRF2, suggesting that UHRF2 is essential in ATR activation. In conclusion, these results suggest a new regulatory mechanism of ATR activation mediated by UHRF2.
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Affiliation(s)
- Shunsuke Hanaki
- Department of Veterinary Biochemistry, Yamaguchi University, Yamaguchi City, Japan
| | - Makoto Habara
- Department of Veterinary Biochemistry, Yamaguchi University, Yamaguchi City, Japan
| | - Midori Shimada
- Department of Veterinary Biochemistry, Yamaguchi University, Yamaguchi City, Japan
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13
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Abstract
DNA is the source of genetic information, and preserving its integrity is essential in order to sustain life. The genome is continuously threatened by different types of DNA lesions, such as abasic sites, mismatches, interstrand crosslinks, or single-stranded and double-stranded breaks. As a consequence, cells have evolved specialized DNA damage response (DDR) mechanisms to sustain genome integrity. By orchestrating multilayer signaling cascades specific for the type of lesion that occurred, the DDR ensures that genetic information is preserved overtime. In the last decades, DNA repair mechanisms have been thoroughly investigated to untangle these complex networks of pathways and processes. As a result, key factors have been identified that control and coordinate DDR circuits in time and space. In the first part of this review, we describe the critical processes encompassing DNA damage sensing and resolution. In the second part, we illustrate the consequences of partial or complete failure of the DNA repair machinery. Lastly, we will report examples in which this knowledge has been instrumental to develop novel therapies based on genome editing technologies, such as CRISPR-Cas.
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14
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Brannvoll A, Xue X, Kwon Y, Kompocholi S, Simonsen AKW, Viswalingam KS, Gonzalez L, Hickson ID, Oestergaard VH, Mankouri HW, Sung P, Lisby M. The ZGRF1 Helicase Promotes Recombinational Repair of Replication-Blocking DNA Damage in Human Cells. Cell Rep 2020; 32:107849. [PMID: 32640219 PMCID: PMC7473174 DOI: 10.1016/j.celrep.2020.107849] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Revised: 05/10/2020] [Accepted: 06/11/2020] [Indexed: 01/05/2023] Open
Abstract
Replication-blocking DNA lesions are particularly toxic to proliferating cells because they can lead to chromosome mis-segregation if not repaired prior to mitosis. In this study, we report that ZGRF1 null cells accumulate chromosome aberrations following replication perturbation and show sensitivity to two potent replication-blocking anticancer drugs: mitomycin C and camptothecin. Moreover, ZGRF1 null cells are defective in catalyzing DNA damage-induced sister chromatid exchange despite accumulating excessive FANCD2, RAD51, and γ-H2AX foci upon induction of interstrand DNA crosslinks. Consistent with a direct role in promoting recombinational DNA repair, we show that ZGRF1 is a 5'-to-3' helicase that catalyzes D-loop dissociation and Holliday junction branch migration. Moreover, ZGRF1 physically interacts with RAD51 and stimulates strand exchange catalyzed by RAD51-RAD54. On the basis of these data, we propose that ZGRF1 promotes repair of replication-blocking DNA lesions through stimulation of homologous recombination.
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Affiliation(s)
- André Brannvoll
- Department of Biology, University of Copenhagen, 2200 Copenhagen N, Denmark; Center for Chromosome Stability, Department of Cellular and Molecular Medicine, University of Copenhagen, 2200 Copenhagen N, Denmark
| | - Xiaoyu Xue
- Department of Chemistry and Biochemistry, Texas State University, San Marcos, TX 78666, USA
| | - Youngho Kwon
- Department of Biochemistry and Structural Biology, University of Texas Health Science Center at San Antonio, San Antonio, TX 78229, USA
| | | | | | | | - Leticia Gonzalez
- Department of Chemistry and Biochemistry, Texas State University, San Marcos, TX 78666, USA
| | - Ian D Hickson
- Center for Chromosome Stability, Department of Cellular and Molecular Medicine, University of Copenhagen, 2200 Copenhagen N, Denmark
| | - Vibe H Oestergaard
- Department of Biology, University of Copenhagen, 2200 Copenhagen N, Denmark
| | - Hocine W Mankouri
- Center for Chromosome Stability, Department of Cellular and Molecular Medicine, University of Copenhagen, 2200 Copenhagen N, Denmark
| | - Patrick Sung
- Department of Biochemistry and Structural Biology, University of Texas Health Science Center at San Antonio, San Antonio, TX 78229, USA
| | - Michael Lisby
- Department of Biology, University of Copenhagen, 2200 Copenhagen N, Denmark; Center for Chromosome Stability, Department of Cellular and Molecular Medicine, University of Copenhagen, 2200 Copenhagen N, Denmark.
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15
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Socha A, Yang D, Bulsiewicz A, Yaprianto K, Kupculak M, Liang CC, Hadjicharalambous A, Wu R, Gygi SP, Cohn MA. WRNIP1 Is Recruited to DNA Interstrand Crosslinks and Promotes Repair. Cell Rep 2020; 32:107850. [PMID: 32640220 PMCID: PMC7351111 DOI: 10.1016/j.celrep.2020.107850] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2019] [Revised: 01/15/2020] [Accepted: 06/11/2020] [Indexed: 12/22/2022] Open
Abstract
The Fanconi anemia (FA) pathway repairs DNA interstrand crosslinks (ICLs). Many FA proteins are recruited to ICLs in a timely fashion so that coordinated repair can occur. However, the mechanism of this process is poorly understood. Here, we report the purification of a FANCD2-containing protein complex with multiple subunits, including WRNIP1. Using live-cell imaging, we show that WRNIP1 is recruited to ICLs quickly after their appearance, promoting repair. The observed recruitment facilitates subsequent recruitment of the FANCD2/FANCI complex. Depletion of WRNIP1 sensitizes cells to ICL-forming drugs. We find that ubiquitination of WRNIP1 and the activity of its UBZ domain are required to facilitate recruitment of FANCD2/FANCI and promote repair. Altogether, we describe a mechanism by which WRNIP1 is recruited rapidly to ICLs, resulting in chromatin loading of the FANCD2/FANCI complex in an unusual process entailing ubiquitination of WRNIP1 and the activity of its integral UBZ domain. Multiple proteins are identified in a FANCD2 protein complex, including WRNIP1 WRNIP1 is recruited to DNA interstrand crosslinks and promotes DNA repair Recruitment of WRNIP1 facilitates loading of the FANCD2/FANCI complex onto DNA Ubiquitination of WRNIP1 and its UBZ domain are required for DNA repair
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Affiliation(s)
- Anna Socha
- Department of Biochemistry, University of Oxford, Oxford OX1 3QU, UK
| | - Di Yang
- Department of Biochemistry, University of Oxford, Oxford OX1 3QU, UK
| | - Alicja Bulsiewicz
- Department of Biochemistry, University of Oxford, Oxford OX1 3QU, UK
| | - Kelvin Yaprianto
- Department of Biochemistry, University of Oxford, Oxford OX1 3QU, UK
| | - Marian Kupculak
- Department of Biochemistry, University of Oxford, Oxford OX1 3QU, UK
| | - Chih-Chao Liang
- Department of Biochemistry, University of Oxford, Oxford OX1 3QU, UK
| | | | - Ronghu Wu
- Department of Cell Biology, Harvard Medical School, Boston, MA 01125, USA
| | - Steven P Gygi
- Department of Cell Biology, Harvard Medical School, Boston, MA 01125, USA
| | - Martin A Cohn
- Department of Biochemistry, University of Oxford, Oxford OX1 3QU, UK.
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16
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Taylor SJ, Arends MJ, Langdon SP. Inhibitors of the Fanconi anaemia pathway as potential antitumour agents for ovarian cancer. Exploration of Targeted Anti-tumor Therapy 2020; 1:26-52. [PMID: 36046263 PMCID: PMC9400734 DOI: 10.37349/etat.2020.00003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2019] [Accepted: 12/18/2019] [Indexed: 11/30/2022] Open
Abstract
The Fanconi anaemia (FA) pathway is an important mechanism for cellular DNA damage repair, which functions to remove toxic DNA interstrand crosslinks. This is particularly relevant in the context of ovarian and other cancers which rely extensively on interstrand cross-link generating platinum chemotherapy as standard of care treatment. These cancers often respond well to initial treatment, but reoccur with resistant disease and upregulation of DNA damage repair pathways. The FA pathway is therefore of great interest as a target for therapies that aim to improve the efficacy of platinum chemotherapies, and reverse tumour resistance to these. In this review, we discuss recent advances in understanding the mechanism of interstrand cross-link repair by the FA pathway, and the potential of the component parts as targets for therapeutic agents. We then focus on the current state of play of inhibitor development, covering both the characterisation of broad spectrum inhibitors and high throughput screening approaches to identify novel small molecule inhibitors. We also consider synthetic lethality between the FA pathway and other DNA damage repair pathways as a therapeutic approach.
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Affiliation(s)
- Sarah J Taylor
- Cancer Research UK Edinburgh Centre and Edinburgh Pathology, Institute of Genetics and Molecular Medicine, University of Edinburgh, Crewe Road South, EH4 2XU Edinburgh, UK
| | - Mark J Arends
- Cancer Research UK Edinburgh Centre and Edinburgh Pathology, Institute of Genetics and Molecular Medicine, University of Edinburgh, Crewe Road South, EH4 2XU Edinburgh, UK
| | - Simon P Langdon
- Cancer Research UK Edinburgh Centre and Edinburgh Pathology, Institute of Genetics and Molecular Medicine, University of Edinburgh, Crewe Road South, EH4 2XU Edinburgh, UK
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17
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Abstract
Ubiquitination is a posttranslational modification characterized by the covalent attachment of ubiquitin molecules to protein substrates. The ubiquitination modification process is reversible, dynamic, and involved in the regulation of various biological processes, such as autophagy, inflammatory responses, and DNA damage responses. The forms of ubiquitin modification are very diverse, incorporating either a single ubiquitin molecule or a complicated ubiquitin polymer, and different types of ubiquitination usually elicit corresponding cellular responses. The development of research tools and strategies has afforded more detailed insight into atypical ubiquitin signaling pathways that were previously poorly understood. Here, an update on the understanding of atypical ubiquitin chain signaling pathways is provided and the recent development of representative research tools for ubiquitin systems is discussed. In addition, the future challenges in ubiquitin research are reflected on and summarized.
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Affiliation(s)
- Qiuling Huang
- Key Laboratory of Regenerative Biology of the Chinese Academy of Sciences and Guangdong Provincial Key Laboratory of Stem Cells and Regenerative Medicine, South China Institute for Stem Cell Biology and Regenerative Medicine, Hefei Institute of Stem Cell and Regenerative Medicine, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou, 510530, China
| | - Xiaofei Zhang
- Key Laboratory of Regenerative Biology of the Chinese Academy of Sciences and Guangdong Provincial Key Laboratory of Stem Cells and Regenerative Medicine, South China Institute for Stem Cell Biology and Regenerative Medicine, Hefei Institute of Stem Cell and Regenerative Medicine, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou, 510530, China.,Guangzhou Regenerative Medicine and Health Guangdong Laboratory, Guangzhou, 510530, China
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18
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Lopez-Martinez D, Kupculak M, Yang D, Yoshikawa Y, Liang CC, Wu R, Gygi SP, Cohn MA. Phosphorylation of FANCD2 Inhibits the FANCD2/FANCI Complex and Suppresses the Fanconi Anemia Pathway in the Absence of DNA Damage. Cell Rep 2019; 27:2990-3005.e5. [PMID: 31167143 PMCID: PMC6581795 DOI: 10.1016/j.celrep.2019.05.003] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Revised: 04/01/2019] [Accepted: 04/29/2019] [Indexed: 12/19/2022] Open
Abstract
Interstrand crosslinks (ICLs) of the DNA helix are a deleterious form of DNA damage. ICLs can be repaired by the Fanconi anemia pathway. At the center of the pathway is the FANCD2/FANCI complex, recruitment of which to DNA is a critical step for repair. After recruitment, monoubiquitination of both FANCD2 and FANCI leads to their retention on chromatin, ensuring subsequent repair. However, regulation of recruitment is poorly understood. Here, we report a cluster of phosphosites on FANCD2 whose phosphorylation by CK2 inhibits both FANCD2 recruitment to ICLs and its monoubiquitination in vitro and in vivo. We have found that phosphorylated FANCD2 possesses reduced DNA binding activity, explaining the previous observations. Thus, we describe a regulatory mechanism operating as a molecular switch, where in the absence of DNA damage, the FANCD2/FANCI complex is prevented from loading onto DNA, effectively suppressing the FA pathway.
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Affiliation(s)
| | - Marian Kupculak
- Department of Biochemistry, University of Oxford, Oxford OX1 3QU, UK
| | - Di Yang
- Department of Biochemistry, University of Oxford, Oxford OX1 3QU, UK
| | | | - Chih-Chao Liang
- Department of Biochemistry, University of Oxford, Oxford OX1 3QU, UK
| | - Ronghu Wu
- Department of Cell Biology, Harvard Medical School, Boston, MA 01125, USA
| | - Steven P Gygi
- Department of Cell Biology, Harvard Medical School, Boston, MA 01125, USA
| | - Martin A Cohn
- Department of Biochemistry, University of Oxford, Oxford OX1 3QU, UK.
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