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Rogers JM, Mimoso CA, Martin BJE, Martin AP, Aster JC, Adelman K, Blacklow SC. Notch induces transcription by stimulating release of paused RNA Polymerase II. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.06.13.598853. [PMID: 38915655 PMCID: PMC11195215 DOI: 10.1101/2024.06.13.598853] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/26/2024]
Abstract
Notch proteins undergo ligand-induced proteolysis to release a nuclear effector that influences a wide range of cellular processes by regulating transcription. Despite years of study, however, how Notch induces the transcription of its target genes remains unclear. Here, we comprehensively examined the response to human Notch1 across a time course of activation using high-resolution genomic assays of chromatin accessibility and nascent RNA production. Our data reveal that Notch induces target gene transcription primarily by releasing paused RNA polymerase II (RNAPII). Moreover, in contrast to prevailing models suggesting that Notch acts by promoting chromatin accessibility, we found that open chromatin was established at Notch-responsive regulatory elements prior to Notch signal induction, through SWI/SNF-mediated remodeling. Together, these studies show that the nuclear response to Notch signaling is dictated by the pre-existing chromatin state and RNAPII distribution at the time of signal activation.
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Affiliation(s)
- Julia M Rogers
- Department of Biological Chemistry and Molecular Pharmacology, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Claudia A Mimoso
- Department of Biological Chemistry and Molecular Pharmacology, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Benjamin JE Martin
- Department of Biological Chemistry and Molecular Pharmacology, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Alexandre P Martin
- Department of Biological Chemistry and Molecular Pharmacology, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Jon C Aster
- Department of Pathology, Brigham and Women’s Hospital, Boston, MA 02215, USA
- Ludwig Center at Harvard, Boston, MA 02115, USA
| | - Karen Adelman
- Department of Biological Chemistry and Molecular Pharmacology, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
- Ludwig Center at Harvard, Boston, MA 02115, USA
- The Eli and Edythe L. Broad Institute, Cambridge, MA 02142, USA
| | - Stephen C Blacklow
- Department of Biological Chemistry and Molecular Pharmacology, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
- The Eli and Edythe L. Broad Institute, Cambridge, MA 02142, USA
- Department of Cancer Biology, Dana Farber Cancer Institute, Boston, MA 02215, USA
- Lead contact
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2
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Tveriakhina L, Scanavachi G, Egan ED, Da Cunha Correia RB, Martin AP, Rogers JM, Yodh JS, Aster JC, Kirchhausen T, Blacklow SC. Temporal dynamics and stoichiometry in human Notch signaling from Notch synaptic complex formation to nuclear entry of the Notch intracellular domain. Dev Cell 2024; 59:1425-1438.e8. [PMID: 38574735 DOI: 10.1016/j.devcel.2024.03.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Revised: 01/10/2024] [Accepted: 03/11/2024] [Indexed: 04/06/2024]
Abstract
Mammalian Notch signaling occurs when the binding of Delta or Jagged to Notch stimulates the proteolytic release of the Notch intracellular domain (NICD), which enters the nucleus to control target gene expression. To determine the temporal dynamics of events associated with Notch signaling under native conditions, we fluorescently tagged Notch and Delta at their endogenous genomic loci and visualized them upon pairing of receiver (Notch) and sender (Delta) cells as a function of time after cell contact. At contact sites, Notch and Delta immediately accumulated at 1:1 stoichiometry in synapses, which resolved by 15-20 min after contact. Synapse formation preceded the entrance of the Notch extracellular domain into the sender cell and accumulation of NICD in the nucleus of the receiver cell, which approached a maximum after ∼45 min and was prevented by chemical and genetic inhibitors of signaling. These findings directly link Notch-Delta synapse dynamics to NICD production with spatiotemporal precision.
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Affiliation(s)
- Lena Tveriakhina
- Department of Biological Chemistry and Molecular Pharmacology, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Gustavo Scanavachi
- Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA; Program in Cellular and Molecular Medicine, Boston Children's Hospital, Boston, MA 02115, USA
| | - Emily D Egan
- Department of Biological Chemistry and Molecular Pharmacology, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Ricardo Bango Da Cunha Correia
- Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA; Program in Cellular and Molecular Medicine, Boston Children's Hospital, Boston, MA 02115, USA
| | - Alexandre P Martin
- Department of Biological Chemistry and Molecular Pharmacology, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Julia M Rogers
- Department of Biological Chemistry and Molecular Pharmacology, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Jeremy S Yodh
- Department of Physics, Harvard University, Cambridge, MA 02138, USA
| | - Jon C Aster
- Department of Pathology, Brigham and Women's Hospital, Boston, MA 02115, USA
| | - Tom Kirchhausen
- Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA; Program in Cellular and Molecular Medicine, Boston Children's Hospital, Boston, MA 02115, USA; Department of Pediatrics, Harvard Medical School, Boston, MA 02115, USA.
| | - Stephen C Blacklow
- Department of Biological Chemistry and Molecular Pharmacology, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA; Department of Cancer Biology, Dana Farber Cancer Institute, Boston, MA 02215, USA.
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3
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Niederhuber MJ, Leatham-Jensen M, McKay DJ. The SWI/SNF nucleosome remodeler constrains enhancer activity during Drosophila wing development. Genetics 2024; 226:iyad196. [PMID: 37949841 PMCID: PMC10847718 DOI: 10.1093/genetics/iyad196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Revised: 10/05/2023] [Accepted: 10/30/2023] [Indexed: 11/12/2023] Open
Abstract
Chromatin remodeling is central to the dynamic changes in gene expression that drive cell fate determination. During development, the sets of enhancers that are accessible for use change globally as cells transition between stages. While transcription factors and nucleosome remodelers are known to work together to control enhancer accessibility, it is unclear how the short stretches of DNA that they individually unmask yield the kilobase-sized accessible regions characteristic of active enhancers. Here, we performed a genetic screen to investigate the role of nucleosome remodelers in control of dynamic enhancer activity. We find that the Drosophila Switch/Sucrose Non-Fermenting complex, BAP, is required for repression of a temporally dynamic enhancer, brdisc. Contrary to expectations, we find that the BAP-specific subunit Osa is dispensable for mediating changes in chromatin accessibility between the early and late stages of wing development. Instead, we find that Osa is required to constrain the levels of brdisc activity when the enhancer is normally active. Genome-wide profiling reveals that Osa directly binds brdisc as well as thousands of other developmentally dynamic regulatory sites, including multiple genes encoding components and targets of the Notch signaling pathway. Transgenic reporter analyses demonstrate that Osa is required for activation and for constraint of different sets of target enhancers in the same cells. Moreover, Osa loss results in hyperactivation of the Notch ligand Delta and development of ectopic sensory structures patterned by Notch signaling early in development. Together, these findings indicate that proper constraint of enhancer activity is necessary for regulation of dose-dependent developmental events.
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Affiliation(s)
- Matthew J Niederhuber
- Curriculum in Genetics and Molecular Biology, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
- Department of Biology, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
- Department of Genetics, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
- Integrative Program for Biological and Genome Sciences, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Mary Leatham-Jensen
- Department of Biology, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
- Department of Genetics, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
- Integrative Program for Biological and Genome Sciences, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Daniel J McKay
- Department of Biology, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
- Department of Genetics, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
- Integrative Program for Biological and Genome Sciences, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
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4
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Tveriakhina L, Scanavachi G, Egan ED, Correia RBDC, Martin AP, Rogers JM, Yodh JS, Aster JC, Kirchhausen T, Blacklow SC. Temporal Dynamics and Stoichiometry in Notch Signaling - from Notch Synaptic Complex Formation to NICD Nuclear Entry. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.09.27.559780. [PMID: 37808809 PMCID: PMC10557745 DOI: 10.1101/2023.09.27.559780] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/10/2023]
Abstract
Mammalian Notch signaling occurs when binding of Delta or Jagged to Notch stimulates proteolytic release of the Notch intracellular domain (NICD), which enters the nucleus to regulate target gene expression. To determine the temporal dynamics of events associated with Notch signaling under native conditions, we fluorescently tagged Notch and Delta at their endogenous genomic loci and visualized them upon pairing of receiver (Notch) and sender (Delta) cells as a function of time after cell contact. At contact sites, Notch and Delta immediately accumulated at 1:1 stoichiometry in synapses, which resolved by 15-20 min after contact. Synapse formation preceded entrance of the Notch extracellular domain into the sender cell and accumulation of NICD in the nucleus of the receiver cell, which approached a maximum after ∼45 min and was prevented by chemical and genetic inhibitors of signaling. These findings directly link Notch-Delta synapse dynamics to NICD production with unprecedented spatiotemporal precision.
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5
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Rosales-Vega M, Reséndez-Pérez D, Zurita M, Vázquez M. TnaA, a trithorax group protein, modulates wingless expression in different regions of the Drosophila wing imaginal disc. Sci Rep 2023; 13:15162. [PMID: 37704704 PMCID: PMC10499800 DOI: 10.1038/s41598-023-42169-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Accepted: 09/06/2023] [Indexed: 09/15/2023] Open
Abstract
wingless expression is exquisitely regulated by different factors and enhancers in the imaginal wing discs of Drosophila melanogaster in four domains: the dorsal band, the dorso-ventral boundary, and the inner and outer ring domains. tonalli is a trithorax group gene that encodes a putative SUMO E3 ligase that binds to chromatin to regulate the expression of its targets, including the Hox genes. However, its role in modulating gene expression is barely known. Here, we show that TnaA modulates the wingless expression at two domains of the wing disc, the dorso-ventral boundary and the inner ring. At first, tonalli interacts genetically with Notch to form the wing margin. In the inner ring domain, TnaA modulates wingless transcription. When the dosage of TnaA increases in or near the inner ring since early larval stages, this domain expands with a rapid increase in wingless expression. TnaA occupies the wingless Inner Ring Enhancer at the wing disc, meanwhile it does not affect wingless expression directed by the Ventral Disc Enhancer in leg discs, suggesting that TnaA acts as a wingless enhancer-specific factor. We describe for the first time the presence of TnaA at the Inner Ring Enhancer as a specific regulator of wingless in the development of wing boundaries.
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Affiliation(s)
- Marco Rosales-Vega
- Departamento de Genética del Desarrollo y Fisiología Molecular, Instituto de Biotecnología, Universidad Nacional Autónoma de México, 62210, Cuernavaca, Morelos, Mexico
| | - Diana Reséndez-Pérez
- Departamento de Inmunología y Virología, Facultad de Ciencias Biológicas, Universidad Autónoma de Nuevo León, San Nicolás de los Garza, Nuevo León, Mexico
| | - Mario Zurita
- Departamento de Genética del Desarrollo y Fisiología Molecular, Instituto de Biotecnología, Universidad Nacional Autónoma de México, 62210, Cuernavaca, Morelos, Mexico
| | - Martha Vázquez
- Departamento de Genética del Desarrollo y Fisiología Molecular, Instituto de Biotecnología, Universidad Nacional Autónoma de México, 62210, Cuernavaca, Morelos, Mexico.
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6
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Martin AP, Bradshaw GA, Eisert RJ, Egan ED, Tveriakhina L, Rogers JM, Dates AN, Scanavachi G, Aster JC, Kirchhausen T, Kalocsay M, Blacklow SC. A spatiotemporal Notch interaction map from plasma membrane to nucleus. Sci Signal 2023; 16:eadg6474. [PMID: 37527352 PMCID: PMC10560377 DOI: 10.1126/scisignal.adg6474] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Accepted: 07/07/2023] [Indexed: 08/03/2023]
Abstract
Notch signaling relies on ligand-induced proteolysis of the transmembrane receptor Notch to liberate a nuclear effector that drives cell fate decisions. Upon ligand binding, sequential cleavage of Notch by the transmembrane protease ADAM10 and the intracellular protease γ-secretase releases the Notch intracellular domain (NICD), which translocates to the nucleus and forms a complex that induces target gene transcription. To map the location and timing of the individual steps required for the proteolysis and movement of Notch from the plasma membrane to the nucleus, we used proximity labeling with quantitative, multiplexed mass spectrometry to monitor the interaction partners of endogenous NOTCH2 after ligand stimulation in the presence of a γ-secretase inhibitor and as a function of time after inhibitor removal. Our studies showed that γ-secretase-mediated cleavage of NOTCH2 occurred in an intracellular compartment and that formation of nuclear complexes and recruitment of chromatin-modifying enzymes occurred within 45 min of inhibitor washout. These findings provide a detailed spatiotemporal map tracking the path of Notch from the plasma membrane to the nucleus and identify signaling events that are potential targets for modulating Notch activity.
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Affiliation(s)
- Alexandre P. Martin
- Department of Biological Chemistry and Molecular Pharmacology, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Gary A. Bradshaw
- Department of Systems Biology, Laboratory of Systems Pharmacology, Harvard Medical School, Boston, MA 02115, USA
| | - Robyn J. Eisert
- Department of Biological Chemistry and Molecular Pharmacology, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Emily D. Egan
- Department of Biological Chemistry and Molecular Pharmacology, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Lena Tveriakhina
- Department of Biological Chemistry and Molecular Pharmacology, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Julia M. Rogers
- Department of Biological Chemistry and Molecular Pharmacology, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Andrew N. Dates
- Department of Biological Chemistry and Molecular Pharmacology, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
| | - Gustavo Scanavachi
- Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA
- Program in Cellular and Molecular Medicine, Boston Children’s Hospital, Boston, MA 02115, USA; Department of Pediatrics, Harvard Medical School, Boston, MA 02115, USA
| | - Jon C. Aster
- Department of Pathology, Brigham and Women’s Hospital, Boston, MA 02115, USA
| | - Tom Kirchhausen
- Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA
- Program in Cellular and Molecular Medicine, Boston Children’s Hospital, Boston, MA 02115, USA; Department of Pediatrics, Harvard Medical School, Boston, MA 02115, USA
| | - Marian Kalocsay
- Department of Experimental Radiation Oncology, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Stephen C. Blacklow
- Department of Biological Chemistry and Molecular Pharmacology, Blavatnik Institute, Harvard Medical School, Boston, MA 02115, USA
- Department of Cancer Biology, Dana Farber Cancer Institute, Boston, MA 02215, USA
- Lead contact
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7
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Carty SA, Murga-Zamalloa CA, Wilcox RA. SOHO State of the Art Updates and Next Questions | New Pathways and New Targets in PTCL: Staying on Target. CLINICAL LYMPHOMA, MYELOMA & LEUKEMIA 2023; 23:561-574. [PMID: 37142534 PMCID: PMC10565700 DOI: 10.1016/j.clml.2023.04.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2023] [Revised: 04/05/2023] [Accepted: 04/16/2023] [Indexed: 05/06/2023]
Abstract
While the peripheral T-cell lymphomas (PTCL) remain a therapeutic challenge, and increasingly account for a disproportionate number of lymphoma-related deaths, improved understanding of disease pathogenesis and classification, and the development of novel therapeutic agents over the past decade, all provide reasons for a more optimistic outlook in the next. Despite their genetic and molecular heterogeneity, many PTCL are dependent upon signaling input provided by antigen, costimulatory, and cytokine receptors. While gain-of-function alterations effecting these pathways are recurrently observed in many PTCL, more often than not, signaling remains ligand-and tumor microenvironment (TME)-dependent. Consequently, the TME and its constituents are increasingly recognized as "on target". Utilizing a "3 signal" model, we will review new-and old-therapeutic targets that are relevant for the more common nodal PTCL subtypes.
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Affiliation(s)
- Shannon A Carty
- Department of Internal Medicine, Division of Hematology and Oncology, University of Michigan, Ann Arbor, MI
| | | | - Ryan A Wilcox
- Department of Internal Medicine, Division of Hematology and Oncology, University of Michigan, Ann Arbor, MI.
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8
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da Silva FJ, Carvalho de Azevedo J, Ralph ACL, Pinheiro JDJV, Freitas VM, Calcagno DQ. Salivary glands adenoid cystic carcinoma: a molecular profile update and potential implications. Front Oncol 2023; 13:1191218. [PMID: 37476370 PMCID: PMC10354556 DOI: 10.3389/fonc.2023.1191218] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Accepted: 06/01/2023] [Indexed: 07/22/2023] Open
Abstract
Adenoid cystic carcinoma (ACC) is an aggressive tumor with a high propensity for distant metastasis and perineural invasion. This tumor is more commonly found in regions of the head and neck, mainly the salivary glands. In general, the primary treatment modality for ACC is surgical resection and, in some cases, postoperative radiotherapy. However, no effective systemic treatment is available for patients with advanced disease. Furthermore, this tumor type is characterized by recurrent molecular alterations, especially rearrangements involving the MYB, MYBL1, and NFIB genes. In addition, they also reported copy number alterations (CNAs) that impact genes. One of them is C-KIT, mutations that affect signaling pathways such as NOTCH, PI3KCA, and PTEN, as well as alterations in chromatin remodeling genes. The identification of new molecular targets enables the development of specific therapies. Despite ongoing investigations into immunotherapy, tyrosine kinase inhibitors, and anti-angiogenics, no systemic therapy is approved by the FDA for ACC. In this review, we report the genetic and cytogenetic findings on head and neck ACC, highlighting possible targets for therapeutic interventions.
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Affiliation(s)
- Fernanda Jardim da Silva
- Núcleo de Pesquisas em Oncologia, Programa de Pós-Graduação em Oncologia e Ciências Médicas, Universidade Federal do Pará, Belém, Brazil
| | - Juscelino Carvalho de Azevedo
- Núcleo de Pesquisas em Oncologia, Programa de Pós-Graduação em Oncologia e Ciências Médicas, Universidade Federal do Pará, Belém, Brazil
- Hospital Universitário João de Barros Barreto, Programa de Residência Multiprofissional em Saúde (Oncologia), Universidade Federal do Pará, Belém, Brazil
| | - Ana Carolina Lima Ralph
- Faculdade de Farmácia, Faculdade Estácio, Carapicuíba, Brazil
- Instituto de Ciências da Saúde, Programa de Pós-Graduação em Odontologia, Universidade Federal do Pará, Belém, Brazil
| | - João de Jesus Viana Pinheiro
- Laboratório de Microambiente Tumoral, Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo, Brazil
| | - Vanessa Morais Freitas
- Instituto de Ciências da Saúde, Programa de Pós-Graduação em Odontologia, Universidade Federal do Pará, Belém, Brazil
| | - Danielle Queiroz Calcagno
- Núcleo de Pesquisas em Oncologia, Programa de Pós-Graduação em Oncologia e Ciências Médicas, Universidade Federal do Pará, Belém, Brazil
- Hospital Universitário João de Barros Barreto, Programa de Residência Multiprofissional em Saúde (Oncologia), Universidade Federal do Pará, Belém, Brazil
- Laboratório de Microambiente Tumoral, Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo, Brazil
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9
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Li Z, Zhao J, Tang Y. Advances in the role of SWI/SNF complexes in tumours. J Cell Mol Med 2023; 27:1023-1031. [PMID: 36883311 PMCID: PMC10098296 DOI: 10.1111/jcmm.17709] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Revised: 02/17/2023] [Accepted: 02/22/2023] [Indexed: 03/09/2023] Open
Abstract
Cancer development is a complex process involving both genetic and epigenetic changes. The SWI/SNF (switch/sucrose non-fermentable) chromatin remodelling complex, one of the most studied ATP-dependent complexes, plays an important role in coordinating chromatin structural stability, gene expression and post-translational modifications. The SWI/SNF complex can be classified into BAF, PBAF and GBAF according to their constituent subunits. Cancer genome sequencing studies have shown a high incidence of mutations in genes encoding subunits of the SWI/SNF chromatin remodelling complex, with abnormalities in one or more of these genes present in nearly 25% of all cancers, which indicating that stabilizing normal expression of genes encoding subunits in the SWI/SNF complex may prevent tumorigenesis. In this paper, we will review the relationship between the SWI/SNF complex and some clinical tumours and its mechanism of action. The aim is to provide a theoretical basis to guide the diagnosis and treatment of tumours caused by mutations or inactivation of one or more genes encoding subunits of the SWI/SNF complex in the clinical setting.
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Affiliation(s)
- Ziwei Li
- Chongqing Health Center for Women and Children, Women and Children's Hospital of Chongqing Medical University, Chongqing, China
| | - Jiumei Zhao
- Chongqing Nanchuan District People's Hospital, Chongqing, China
| | - Yu Tang
- The Third Affiliated Hospital of Kunming Medical University, Yunnan Cancer Hospital, Kunming, China.,Department of Genetics, Zunyi Medical University, Guizhou, China
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Li C, Wang T, Gu J, Qi S, Li J, Chen L, Wu H, Shi L, Song C, Li H, Zhu L, Lu Y, Zhou Q. SMARCC2 mediates the regulation of DKK1 by the transcription factor EGR1 through chromatin remodeling to reduce the proliferative capacity of glioblastoma. Cell Death Dis 2022; 13:990. [PMID: 36418306 PMCID: PMC9684443 DOI: 10.1038/s41419-022-05439-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2022] [Revised: 10/25/2022] [Accepted: 11/14/2022] [Indexed: 11/25/2022]
Abstract
Switch/sucrose-nonfermenting (SWI/SNF) complexes play a key role in chromatin remodeling. Recent studies have found that SMARCC2, as the core subunit of the fundamental module of the complex, plays a key role in its early assembly. In this study, we found a unique function of SMARCC2 in inhibiting the progression of glioblastoma by targeting the DKK1 signaling axis. Low expression of SMARCC2 is found in malignant glioblastoma (GBM) compared with low-grade gliomas. SMARCC2 knockout promoted the proliferation of glioblastoma cells, while its overexpression showed the opposite effect. Mechanistically, SMARCC2 negatively regulates transcription by dynamically regulating the chromatin structure and closing the promoter region of the target gene DKK1, which can be bound by the transcription factor EGR1. DKK1 knockdown significantly reduced the proliferation of glioblastoma cell lines by inhibiting the PI3K-AKT pathway. We also studied the functions of the SWIRM and SANT domains of SMARCC2 and found that the SWIRM domain plays a more important role in the complete chromatin remodeling function of SMARCC2. In addition, in vivo studies confirmed that overexpression of SMARCC2 could significantly inhibit the size of intracranial gliomas in situ in nude mice. Overall, this study shows that SMARCC2, as a tumor suppressor, inhibits the proliferation of glioblastoma by targeting the transcription of the oncogene DKK1 through chromatin remodeling, indicating that SMARCC2 is a potentially attractive therapeutic target in glioblastoma.
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Affiliation(s)
- Chiyang Li
- grid.284723.80000 0000 8877 7471Department of Neurosurgery, Southern Medical University, Guangzhou, China
| | - Tong Wang
- grid.284723.80000 0000 8877 7471Department of Neurosurgery, Southern Medical University, Guangzhou, China
| | - Junwei Gu
- grid.284723.80000 0000 8877 7471Department of Neurosurgery, Southern Medical University, Guangzhou, China
| | - Songtao Qi
- grid.284723.80000 0000 8877 7471Department of Neurosurgery, Southern Medical University, Guangzhou, China ,grid.284723.80000 0000 8877 7471Nanfang Neurology Research Institution, Nanfang Hospital, Southern Medical University, Guangzhou, China ,Nanfang Glioma Center, Guangzhou, China
| | - Junjie Li
- grid.284723.80000 0000 8877 7471Department of Neurosurgery, Southern Medical University, Guangzhou, China
| | - Lei Chen
- grid.284723.80000 0000 8877 7471Department of Neurosurgery, Southern Medical University, Guangzhou, China
| | - Hang Wu
- grid.284723.80000 0000 8877 7471Department of Hematology, Nanfang Hospital, Southern Medical University, 510000 Guangzhou, Guangdong P.R. China
| | - Linyong Shi
- grid.284723.80000 0000 8877 7471Department of Neurosurgery, Southern Medical University, Guangzhou, China
| | - Chong Song
- grid.284723.80000 0000 8877 7471Department of Neurosurgery, Southern Medical University, Guangzhou, China
| | - Hong Li
- grid.284723.80000 0000 8877 7471Department of Neurosurgery, Southern Medical University, Guangzhou, China
| | - Liwen Zhu
- grid.284723.80000 0000 8877 7471Department of Neurosurgery, Southern Medical University, Guangzhou, China
| | - Yuntao Lu
- grid.284723.80000 0000 8877 7471Department of Neurosurgery, Southern Medical University, Guangzhou, China ,grid.284723.80000 0000 8877 7471Nanfang Neurology Research Institution, Nanfang Hospital, Southern Medical University, Guangzhou, China ,Nanfang Glioma Center, Guangzhou, China
| | - Qiang Zhou
- grid.284723.80000 0000 8877 7471Department of Neurosurgery, Southern Medical University, Guangzhou, China ,grid.284723.80000 0000 8877 7471Nanfang Neurology Research Institution, Nanfang Hospital, Southern Medical University, Guangzhou, China ,Nanfang Glioma Center, Guangzhou, China
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11
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Gao X, Wang C, Abdelrahman S, Kady N, Murga-Zamalloa C, Gann P, Sverdlov M, Wolfe A, Polk A, Brown N, Bailey NG, Inamdar K, Casavilca S, Montes J, Barrionuevo C, Taxa L, Reneau J, Siebel CW, Maillard I, Wilcox RA. Notch Signaling Promotes Mature T-Cell Lymphomagenesis. Cancer Res 2022; 82:3763-3773. [PMID: 36006995 PMCID: PMC9588752 DOI: 10.1158/0008-5472.can-22-1215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Revised: 06/15/2022] [Accepted: 08/22/2022] [Indexed: 01/26/2023]
Abstract
Peripheral T-cell lymphomas (PTCL) are agressive lymphomas that develop from mature T cells. The most common PTCLs are genetically, molecularly, and clinically diverse and are generally associated with dismal outcomes. While Notch signaling plays a critically important role in both the development of immature T cells and their malignant transformation, its role in PTCL is poorly understood, despite the increasingly appreciated function of Notch in regulating the proliferation and differentiation of mature T cells. Here, we demonstrate that Notch receptors and their Delta-like family ligands (DLL1/DLL4) play a pathogenic role in PTCL. Notch1 activation was observed in common PTCL subtypes, including PTCL-not otherwise specified (NOS). In a large cohort of PTCL-NOS biopsies, Notch1 activation was significantly associated with surrogate markers of proliferation. Complementary genetically engineered mouse models and spontaneous PTCL models were used to functionally examine the role of Notch signaling, and Notch1/Notch2 blockade and pan-Notch blockade using dominant-negative MAML significantly impaired the proliferation of malignant T cells and PTCL progression in these models. Treatment with DLL1/DLL4 blocking antibodies established that Notch signaling is ligand-dependent. Together, these findings reveal a role for ligand-dependent Notch signaling in driving peripheral T-cell lymphomagenesis. SIGNIFICANCE This work demonstrates that ligand-dependent Notch activation promotes the growth and proliferation of mature T-cell lymphomas, providing new therapeutic strategies for this group of aggressive lymphomas.
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Affiliation(s)
- Xin Gao
- Department of Internal Medicine, Division of Hematology and Oncology, University of Michigan, Ann Arbor, MI
| | - Chenguang Wang
- Department of Internal Medicine, Division of Hematology and Oncology, University of Michigan, Ann Arbor, MI
| | - Suhaib Abdelrahman
- Department of Internal Medicine, Division of Hematology and Oncology, University of Michigan, Ann Arbor, MI
| | - Nermin Kady
- Department of Internal Medicine, Division of Hematology and Oncology, University of Michigan, Ann Arbor, MI
| | | | - Peter Gann
- Department of Pathology, University of Illinois Chicago, Chicago, IL
| | - Maria Sverdlov
- Department of Pathology, University of Illinois Chicago, Chicago, IL
| | - Ashley Wolfe
- Department of Internal Medicine, Division of Hematology and Oncology, University of Michigan, Ann Arbor, MI
| | - Avery Polk
- Department of Internal Medicine, Division of Hematology and Oncology, University of Michigan, Ann Arbor, MI
| | - Noah Brown
- Department of Pathology, University of Michigan, Ann Arbor, MI
| | | | - Kedar Inamdar
- Department of Pathology, Henry Ford Hospital, Detroit, MI
| | - Sandro Casavilca
- Department of Pathology, Instituto Nacional de Enfermedades Neoplasicas (INEN), Lima, Peru
| | - Jaime Montes
- Department of Pathology, Instituto Nacional de Enfermedades Neoplasicas (INEN), Lima, Peru
| | - Carlos Barrionuevo
- Department of Pathology, Instituto Nacional de Enfermedades Neoplasicas (INEN), Lima, Peru
| | - Luis Taxa
- Department of Pathology, Instituto Nacional de Enfermedades Neoplasicas (INEN), Lima, Peru
| | - John Reneau
- Department of Medicine, Division of Hematology, The Ohio State University Comprehensive Cancer Center, Columbus, OH
| | | | - Ivan Maillard
- Department of Medicine, Division of Hematology/Oncology, University of Pennsylvania, Philadelphia, PA
| | - Ryan A. Wilcox
- Department of Internal Medicine, Division of Hematology and Oncology, University of Michigan, Ann Arbor, MI
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12
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Reske JJ, Wilson MR, Armistead B, Harkins S, Perez C, Hrit J, Adams M, Rothbart SB, Missmer SA, Fazleabas AT, Chandler RL. ARID1A-dependent maintenance of H3.3 is required for repressive CHD4-ZMYND8 chromatin interactions at super-enhancers. BMC Biol 2022; 20:209. [PMID: 36153585 PMCID: PMC9509632 DOI: 10.1186/s12915-022-01407-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Accepted: 09/12/2022] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND SWI/SNF (BAF) chromatin remodeling complexes regulate lineage-specific enhancer activity by promoting accessibility for diverse DNA-binding factors and chromatin regulators. Additionally, they are known to modulate the function of the epigenome through regulation of histone post-translational modifications and nucleosome composition, although the way SWI/SNF complexes govern the epigenome remains poorly understood. Here, we investigate the function of ARID1A, a subunit of certain mammalian SWI/SNF chromatin remodeling complexes associated with malignancies and benign diseases originating from the uterine endometrium. RESULTS Through genome-wide analysis of human endometriotic epithelial cells, we show that more than half of ARID1A binding sites are marked by the variant histone H3.3, including active regulatory elements such as super-enhancers. ARID1A knockdown leads to H3.3 depletion and gain of canonical H3.1/3.2 at ARID1A-bound active regulatory elements, and a concomitant redistribution of H3.3 toward genic elements. ARID1A interactions with the repressive chromatin remodeler CHD4 (NuRD) are associated with H3.3, and ARID1A is required for CHD4 recruitment to H3.3. ZMYND8 interacts with CHD4 to suppress a subset of ARID1A, CHD4, and ZMYND8 co-bound, H3.3+ H4K16ac+ super-enhancers near genes governing extracellular matrix, motility, adhesion, and epithelial-to-mesenchymal transition. Moreover, these gene expression alterations are observed in human endometriomas. CONCLUSIONS These studies demonstrate that ARID1A-containing BAF complexes are required for maintenance of the histone variant H3.3 at active regulatory elements, such as super-enhancers, and this function is required for the physiologically relevant activities of alternative chromatin remodelers.
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Affiliation(s)
- Jake J. Reske
- grid.17088.360000 0001 2150 1785Department of Obstetrics, Gynecology and Reproductive Biology, College of Human Medicine, Michigan State University, Grand Rapids, MI 49503 USA
| | - Mike R. Wilson
- grid.17088.360000 0001 2150 1785Department of Obstetrics, Gynecology and Reproductive Biology, College of Human Medicine, Michigan State University, Grand Rapids, MI 49503 USA
| | - Brooke Armistead
- grid.17088.360000 0001 2150 1785Department of Obstetrics, Gynecology and Reproductive Biology, College of Human Medicine, Michigan State University, Grand Rapids, MI 49503 USA
| | - Shannon Harkins
- grid.17088.360000 0001 2150 1785Department of Obstetrics, Gynecology and Reproductive Biology, College of Human Medicine, Michigan State University, Grand Rapids, MI 49503 USA
| | - Cristina Perez
- grid.17088.360000 0001 2150 1785Department of Obstetrics, Gynecology and Reproductive Biology, College of Human Medicine, Michigan State University, Grand Rapids, MI 49503 USA
| | - Joel Hrit
- grid.251017.00000 0004 0406 2057Department of Epigenetics, Van Andel Research Institute, Grand Rapids, MI 49503 USA
| | - Marie Adams
- grid.251017.00000 0004 0406 2057Genomics Core Facility, Van Andel Research Institute, Grand Rapids, MI 49503 USA
| | - Scott B. Rothbart
- grid.251017.00000 0004 0406 2057Department of Epigenetics, Van Andel Research Institute, Grand Rapids, MI 49503 USA
| | - Stacey A. Missmer
- grid.17088.360000 0001 2150 1785Department of Obstetrics, Gynecology and Reproductive Biology, College of Human Medicine, Michigan State University, Grand Rapids, MI 49503 USA ,grid.416230.20000 0004 0406 3236Department of Women’s Health, Spectrum Health System, Grand Rapids, MI 49341 USA
| | - Asgerally T. Fazleabas
- grid.17088.360000 0001 2150 1785Department of Obstetrics, Gynecology and Reproductive Biology, College of Human Medicine, Michigan State University, Grand Rapids, MI 49503 USA ,grid.416230.20000 0004 0406 3236Department of Women’s Health, Spectrum Health System, Grand Rapids, MI 49341 USA
| | - Ronald L. Chandler
- grid.17088.360000 0001 2150 1785Department of Obstetrics, Gynecology and Reproductive Biology, College of Human Medicine, Michigan State University, Grand Rapids, MI 49503 USA ,grid.251017.00000 0004 0406 2057Department of Epigenetics, Van Andel Research Institute, Grand Rapids, MI 49503 USA ,grid.416230.20000 0004 0406 3236Department of Women’s Health, Spectrum Health System, Grand Rapids, MI 49341 USA
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13
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Jiang H, Bian W, Sui Y, Li H, Zhao H, Wang W, Li X. FBXO42 facilitates Notch signaling activation and global chromatin relaxation by promoting K63-linked polyubiquitination of RBPJ. SCIENCE ADVANCES 2022; 8:eabq4831. [PMID: 36129980 PMCID: PMC9491713 DOI: 10.1126/sciadv.abq4831] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Accepted: 08/04/2022] [Indexed: 05/28/2023]
Abstract
Dysregulation of the Notch-RBPJ (recombination signal-binding protein of immunoglobulin kappa J region) signaling pathway has been found associated with various human diseases including cancers; however, precisely how this key signaling pathway is fine-tuned via its interactors and modifications is still largely unknown. In this study, using a proteomic approach, we identified F-box only protein 42 (FBXO42) as a previously unidentified RBPJ interactor. FBXO42 promotes RBPJ polyubiquitination on lysine-175 via lysine-63 linkage, which enhances the association of RBPJ with chromatin remodeling complexes and induces a global chromatin relaxation. Genetically depleting FBXO42 or pharmacologically targeting its E3 ligase activity attenuates the Notch signaling-related leukemia development in vivo. Together, our findings not only revealed FBXO42 as a critical regulator of the Notch pathway by modulating RBPJ-dependent global chromatin landscape changes but also provided insights into the therapeutic intervention of the Notch pathway for leukemia treatment.
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Affiliation(s)
- Hua Jiang
- Fudan University, Shanghai 310018, China
- Key Laboratory of Structural Biology of Zhejiang Province, School of Life Sciences, Westlake University, Hangzhou 310024, Zhejiang, China
- Westlake Laboratory of Life Sciences and Biomedicine, Hangzhou 310024, Zhejiang, China
| | - Weixiang Bian
- Fudan University, Shanghai 310018, China
- Key Laboratory of Structural Biology of Zhejiang Province, School of Life Sciences, Westlake University, Hangzhou 310024, Zhejiang, China
- Westlake Laboratory of Life Sciences and Biomedicine, Hangzhou 310024, Zhejiang, China
| | - Yue Sui
- Fudan University, Shanghai 310018, China
- Key Laboratory of Structural Biology of Zhejiang Province, School of Life Sciences, Westlake University, Hangzhou 310024, Zhejiang, China
- Westlake Laboratory of Life Sciences and Biomedicine, Hangzhou 310024, Zhejiang, China
| | - Huanle Li
- Key Laboratory of Structural Biology of Zhejiang Province, School of Life Sciences, Westlake University, Hangzhou 310024, Zhejiang, China
- Westlake Laboratory of Life Sciences and Biomedicine, Hangzhou 310024, Zhejiang, China
| | - Han Zhao
- Key Laboratory of Structural Biology of Zhejiang Province, School of Life Sciences, Westlake University, Hangzhou 310024, Zhejiang, China
- Westlake Laboratory of Life Sciences and Biomedicine, Hangzhou 310024, Zhejiang, China
| | - Wenqi Wang
- Department of Developmental and Cell Biology, University of California, Irvine, Irvine, CA 92697, USA
| | - Xu Li
- Fudan University, Shanghai 310018, China
- Key Laboratory of Structural Biology of Zhejiang Province, School of Life Sciences, Westlake University, Hangzhou 310024, Zhejiang, China
- Westlake Laboratory of Life Sciences and Biomedicine, Hangzhou 310024, Zhejiang, China
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14
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Jones CA, Tansey WP, Weissmiller AM. Emerging Themes in Mechanisms of Tumorigenesis by SWI/SNF Subunit Mutation. Epigenet Insights 2022; 15:25168657221115656. [PMID: 35911061 PMCID: PMC9329810 DOI: 10.1177/25168657221115656] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Accepted: 07/06/2022] [Indexed: 11/16/2022] Open
Abstract
The SWI/SNF chromatin remodeling complex uses the energy of ATP hydrolysis to alter contacts between DNA and nucleosomes, allowing regions of the genome to become accessible for biological processes such as transcription. The SWI/SNF chromatin remodeler is also one of the most frequently altered protein complexes in cancer, with upwards of 20% of all cancers carrying mutations in a SWI/SNF subunit. Intense studies over the last decade have probed the molecular events associated with SWI/SNF dysfunction in cancer and common themes are beginning to emerge in how tumor-associated SWI/SNF mutations promote malignancy. In this review, we summarize current understanding of SWI/SNF complexes, their alterations in cancer, and what is known about the impact of these mutations on tumor-relevant transcriptional events. We discuss how enhancer dysregulation is a common theme in SWI/SNF mutant cancers and describe how resultant alterations in enhancer and super-enhancer activity conspire to block development and differentiation while promoting stemness and self-renewal. We also identify a second emerging theme in which SWI/SNF perturbations intersect with potent oncoprotein transcription factors AP-1 and MYC to drive malignant transcriptional programs.
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Affiliation(s)
- Cheyenne A Jones
- Department of Biology, Middle Tennessee State University, Murfreesboro, TN, USA
| | - William P Tansey
- Department of Cell and Developmental Biology, Vanderbilt University School of Medicine, Nashville, TN, USA.,Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - April M Weissmiller
- Department of Biology, Middle Tennessee State University, Murfreesboro, TN, USA
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15
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Friedrich T, Ferrante F, Pioger L, Nist A, Stiewe T, Andrau JC, Bartkuhn M, Giaimo BD, Borggrefe T. Notch-dependent and -independent functions of transcription factor RBPJ. Nucleic Acids Res 2022; 50:7925-7937. [PMID: 35848919 PMCID: PMC9371899 DOI: 10.1093/nar/gkac601] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Revised: 05/27/2022] [Accepted: 07/05/2022] [Indexed: 11/14/2022] Open
Abstract
Signal transduction pathways often involve transcription factors that promote activation of defined target gene sets. The transcription factor RBPJ is the central player in Notch signaling and either forms an activator complex with the Notch intracellular domain (NICD) or a repressor complex with corepressors like KYOT2/FHL1. The balance between these two antagonizing RBPJ-complexes depends on the activation state of the Notch receptor regulated by cell-to-cell interaction, ligand binding and proteolytic cleavage events. Here, we depleted RBPJ in mature T-cells lacking active Notch signaling and performed RNA-Seq, ChIP-Seq and ATAC-seq analyses. RBPJ depletion leads to upregulation of many Notch target genes. Ectopic expression of NICD1 activates several Notch target genes and enhances RBPJ occupancy. Based on gene expression changes and RBPJ occupancy we define four different clusters, either RBPJ- and/or Notch-regulated genes. Importantly, we identify early (Hes1 and Hey1) and late Notch-responsive genes (IL2ra). Similarly, to RBPJ depletion, interfering with transcriptional repression by squelching with cofactor KYOT2/FHL1, leads to upregulation of Notch target genes. Taken together, RBPJ is not only an essential part of the Notch co-activator complex but also functions as a repressor in a Notch-independent manner.
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Affiliation(s)
- Tobias Friedrich
- Institute of Biochemistry, Justus-Liebig-University Giessen, Friedrichstrasse 24, 35392 Giessen, Germany.,Biomedical Informatics and Systems Medicine, Justus-Liebig-University Giessen, Aulweg 128, 35392 Giessen, Germany
| | - Francesca Ferrante
- Institute of Biochemistry, Justus-Liebig-University Giessen, Friedrichstrasse 24, 35392 Giessen, Germany
| | - Léo Pioger
- Institut de Génétique Moléculaire de Montpellier, University of Montpellier, CNRS-UMR 5535, 1919 Route de Mende, 34293 cedex 5, Montpellier, France
| | - Andrea Nist
- Genomics Core Facility, Institute of Molecular Oncology, Member of the German Center for Lung Research (DZL), Philipps-University, Hans-Meerwein-Str. 3, 35043 Marburg, Germany
| | - Thorsten Stiewe
- Genomics Core Facility, Institute of Molecular Oncology, Member of the German Center for Lung Research (DZL), Philipps-University, Hans-Meerwein-Str. 3, 35043 Marburg, Germany
| | - Jean-Christophe Andrau
- Institut de Génétique Moléculaire de Montpellier, University of Montpellier, CNRS-UMR 5535, 1919 Route de Mende, 34293 cedex 5, Montpellier, France
| | - Marek Bartkuhn
- Biomedical Informatics and Systems Medicine, Justus-Liebig-University Giessen, Aulweg 128, 35392 Giessen, Germany.,Institute for Lung Health, Aulweg 132, 35392 Giessen, Germany
| | - Benedetto Daniele Giaimo
- Institute of Biochemistry, Justus-Liebig-University Giessen, Friedrichstrasse 24, 35392 Giessen, Germany
| | - Tilman Borggrefe
- Institute of Biochemistry, Justus-Liebig-University Giessen, Friedrichstrasse 24, 35392 Giessen, Germany
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16
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Notch signaling pathway: architecture, disease, and therapeutics. Signal Transduct Target Ther 2022; 7:95. [PMID: 35332121 PMCID: PMC8948217 DOI: 10.1038/s41392-022-00934-y] [Citation(s) in RCA: 319] [Impact Index Per Article: 159.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Revised: 02/16/2022] [Accepted: 02/16/2022] [Indexed: 02/07/2023] Open
Abstract
The NOTCH gene was identified approximately 110 years ago. Classical studies have revealed that NOTCH signaling is an evolutionarily conserved pathway. NOTCH receptors undergo three cleavages and translocate into the nucleus to regulate the transcription of target genes. NOTCH signaling deeply participates in the development and homeostasis of multiple tissues and organs, the aberration of which results in cancerous and noncancerous diseases. However, recent studies indicate that the outcomes of NOTCH signaling are changeable and highly dependent on context. In terms of cancers, NOTCH signaling can both promote and inhibit tumor development in various types of cancer. The overall performance of NOTCH-targeted therapies in clinical trials has failed to meet expectations. Additionally, NOTCH mutation has been proposed as a predictive biomarker for immune checkpoint blockade therapy in many cancers. Collectively, the NOTCH pathway needs to be integrally assessed with new perspectives to inspire discoveries and applications. In this review, we focus on both classical and the latest findings related to NOTCH signaling to illustrate the history, architecture, regulatory mechanisms, contributions to physiological development, related diseases, and therapeutic applications of the NOTCH pathway. The contributions of NOTCH signaling to the tumor immune microenvironment and cancer immunotherapy are also highlighted. We hope this review will help not only beginners but also experts to systematically and thoroughly understand the NOTCH signaling pathway.
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17
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Moldovan GE, Miele L, Fazleabas AT. Notch signaling in reproduction. Trends Endocrinol Metab 2021; 32:1044-1057. [PMID: 34479767 PMCID: PMC8585702 DOI: 10.1016/j.tem.2021.08.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Revised: 07/27/2021] [Accepted: 08/06/2021] [Indexed: 12/22/2022]
Abstract
The Notch signaling pathway is conserved among mammalian species and controls proliferation, differentiation, and cell death in many organs throughout the body including the reproductive tract. Notch signaling plays critical roles in the development and function of both the male and female reproductive systems. Specifically, within the female reproductive tract, Notch signaling is hormone regulated and mediates key reproductive events important for ovarian and uterine function. In this review, we highlight the tissues that express Notch receptors, ligands, and downstream effectors and distinguish how these molecules regulate reproductive function in male and female mice, non-human primates, and humans. Finally, we describe some of the aberrations in Notch signaling in female reproductive pathologies and identify opportunities for future investigation.
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Affiliation(s)
- Genna E Moldovan
- Department of Obstetrics, Gynecology, and Reproductive Biology, Michigan State University, Grand Rapids, MI 49503, USA
| | - Lucio Miele
- Department of Genetics, Louisiana State University Health Sciences Center and Stanley S. Scott Cancer Center, New Orleans, LA 70112, USA
| | - Asgerally T Fazleabas
- Department of Obstetrics, Gynecology, and Reproductive Biology, Michigan State University, Grand Rapids, MI 49503, USA.
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18
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Tilly BC, Chalkley GE, van der Knaap JA, Moshkin YM, Kan TW, Dekkers DH, Demmers JA, Verrijzer CP. In vivo analysis reveals that ATP-hydrolysis couples remodeling to SWI/SNF release from chromatin. eLife 2021; 10:69424. [PMID: 34313222 PMCID: PMC8352592 DOI: 10.7554/elife.69424] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Accepted: 07/26/2021] [Indexed: 12/23/2022] Open
Abstract
ATP-dependent chromatin remodelers control the accessibility of genomic DNA through nucleosome mobilization. However, the dynamics of genome exploration by remodelers, and the role of ATP hydrolysis in this process remain unclear. We used live-cell imaging of Drosophila polytene nuclei to monitor Brahma (BRM) remodeler interactions with its chromosomal targets. In parallel, we measured local chromatin condensation and its effect on BRM association. Surprisingly, only a small portion of BRM is bound to chromatin at any given time. BRM binds decondensed chromatin but is excluded from condensed chromatin, limiting its genomic search space. BRM-chromatin interactions are highly dynamic, whereas histone-exchange is limited and much slower. Intriguingly, loss of ATP hydrolysis enhanced chromatin retention and clustering of BRM, which was associated with reduced histone turnover. Thus, ATP hydrolysis couples nucleosome remodeling to remodeler release, driving a continuous transient probing of the genome.
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Affiliation(s)
- Ben C Tilly
- Department of Biochemistry, Rotterdam, Netherlands
| | | | | | | | | | - Dick Hw Dekkers
- Department of Biochemistry, Rotterdam, Netherlands.,Proteomics Center, Erasmus University Medical Center, Rotterdam, Netherlands
| | - Jeroen Aa Demmers
- Department of Biochemistry, Rotterdam, Netherlands.,Proteomics Center, Erasmus University Medical Center, Rotterdam, Netherlands
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19
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Li C, Fei C, Li J, Wu H, Chen L, Roshani R, Li H, Shi L, Song C, Gu J, Lu Y, Zhou Q. SMARCC2 combined with c‑Myc inhibits the migration and invasion of glioma cells via modulation of the Wnt/β‑catenin signaling pathway. Mol Med Rep 2021; 24:551. [PMID: 34080022 PMCID: PMC8185515 DOI: 10.3892/mmr.2021.12190] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Accepted: 03/19/2021] [Indexed: 11/18/2022] Open
Abstract
Glioma is the most common type of central nervous system tumor. SWItch/sucrose non-fermentable (SWI/SNF) is a tumor suppressor that serves an important role in epithelial-mesenchymal transition (EMT). The present study aimed to identify key molecules involved in the EMT process. SWI/SNF related, matrix associated, actin dependent regulator of chromatin subfamily c member 2 (SMARCC2) is mutated in and its expression is low in multiple types of cancer. SMARCC2 is the core subunit of the chromatin-remodeling complex, SWI/SNF. Relative mRNA SMARCC2 expression levels in human glioma tissue were analyzed via reverse transcription-quantitative PCR, whereas the protein expression levels were determined via immunohistochemistry staining. SMARCC2 expression was knocked down in glioma cells using small interfering RNA (si) and overexpressed by infection with adenovirus vectors carrying SMARCC2 cDNA. Wound healing and Transwell assays were performed to assess cell migration and invasion, respectively. Subsequently, immunofluorescence and western blotting were performed to analyze the expression levels of the oncogene c-Myc, which is associated with SMARCC2. SMARCC2 combines with C-MYC to downregulate its expression. Consistent with the results of the bioinformatics analysis, which revealed that the upregulated expression levels of SMARCC2 were associated with a more favorable prognosis in patients with glioma, the mRNA and protein expression levels of SMARCC2 were significantly upregulated in low-grade glioma tissues compared with high-grade glioma tissues. The results of the wound healing assay demonstrated that cell migration was significantly increased in the siSMARCC2-1/3 groups compared with the negative control (NC) group. By contrast, the migratory ability of cells was significantly reduced following transduction with adenovirus overexpressing SMARCC2, which upregulated the expression of SMARCC2, compared with the lentiviral vector-non-specific control (LVS-NC) group. The Transwell assay results further showed that SMARCC2 overexpression significantly inhibited the migratory and invasive abilities of U87MG and LN229 cells compared with the LVS-NC group. Co-immunoprecipitation assays were subsequently conducted to validate the binding of SMARCC2 and c-Myc; the results demonstrated that the expression of c-Myc was downregulated in adenovirus-transfected cells compared with LVS-NC-transfected cells. The results of the western blotting experiments demonstrated that the expression levels of N-cadherin, vimentin, snail family transcriptional repressor 1 and β-catenin were notably downregulated, whereas the expression levels of T-cadherin were markedly upregulated in cell lines stably overexpressing SMARCC2 compared with the LVS-NC group. In conclusion, the results of the present study suggested that SMARCC2 may inhibit Wnt/β-catenin signaling by regulating c-Myc expression in glioma. SMARCC2 regulates the EMT status of the glioblastoma cell line by mediating the expression of the oncogene C-MYC to inhibit its migration and invasion ability. Thus, SMARCC2 may function as a tumor suppressor or oncogene by regulating associated oncogenes or tumor suppressor genes.
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Affiliation(s)
- Chiyang Li
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong 510515, P.R. China
| | - Chengshuo Fei
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong 510515, P.R. China
| | - Junjie Li
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong 510515, P.R. China
| | - Hang Wu
- Department of Hematology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong 510515, P.R. China
| | - Lei Chen
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong 510515, P.R. China
| | - Ramzi Roshani
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong 510515, P.R. China
| | - Hong Li
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong 510515, P.R. China
| | - Linyong Shi
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong 510515, P.R. China
| | - Chong Song
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong 510515, P.R. China
| | - Junwei Gu
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong 510515, P.R. China
| | - Yuntao Lu
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong 510515, P.R. China
| | - Qiang Zhou
- Department of Neurosurgery, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong 510515, P.R. China
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20
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Bi-Lin KW, Seshachalam PV, Tuoc T, Stoykova A, Ghosh S, Singh MK. Critical role of the BAF chromatin remodeling complex during murine neural crest development. PLoS Genet 2021; 17:e1009446. [PMID: 33750945 PMCID: PMC8016319 DOI: 10.1371/journal.pgen.1009446] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Revised: 04/01/2021] [Accepted: 02/25/2021] [Indexed: 12/16/2022] Open
Abstract
The BAF complex plays an important role in the development of a wide range of tissues by modulating gene expression programs at the chromatin level. However, its role in neural crest development has remained unclear. To determine the role of the BAF complex, we deleted BAF155/BAF170, the core subunits required for the assembly, stability, and functions of the BAF complex in neural crest cells (NCCs). Neural crest-specific deletion of BAF155/BAF170 leads to embryonic lethality due to a wide range of developmental defects including craniofacial, pharyngeal arch artery, and OFT defects. RNAseq and transcription factor enrichment analysis revealed that the BAF complex modulates the expression of multiple signaling pathway genes including Hippo and Notch, essential for the migration, proliferation, and differentiation of the NCCs. Furthermore, we demonstrated that the BAF complex is essential for the Brg1-Yap-Tead-dependent transcription of target genes in NCCs. Together, our results demonstrate an important role of the BAF complex in modulating the gene regulatory network essential for neural crest development. Neural crest cells (NCCs) are a multipotent and migratory cell population that is induced at the neural plate border during neurulation and contributes to the formation of a wide range of tissues. Defects in the development, differentiation, or migration of NCCs lead to various birth defects including craniofacial and heart anomalies. Here, by genetically deleting BAF155/BAF170, the core subunits required for the assembly, stability, and functions of the BAF chromatin remodeling complex, we demonstrate that the BAF complex is essential for the proliferation, survival, and differentiation of the NCCs. Neural crest-specific deletion of BAF155/BAF170 leads to embryonic lethality due to a wide range of developmental defects including craniofacial and cardiovascular defects. By performing RNAseq and transcription factor enrichment analysis we show that the BAF complex modulates the expression of multiple signaling pathway genes including Hippo and Notch, essential for the development of the NCCs. Furthermore, the BAF complex component physically interacts with the Hippo signaling components in NCCs to regulate gene expression. We demonstrated that the BAF complex is essential for the Brg1-Yap-Tead-dependent transcription of target genes in NCCs. Together, our results demonstrate a critical role of the BAF complex in modulating the gene regulatory network essential for the proper development of neural crest and neural crest-derived tissues.
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Affiliation(s)
- Kathleen Wung Bi-Lin
- Program in Cardiovascular and Metabolic Disorders, Duke-NUS Medical School Singapore, Singapore
| | | | - Tran Tuoc
- Department of Human Genetics, Ruhr University of Bochum, Bochum, Germany
- Institute of Neuroanatomy, University Medical Center, Georg-August-University Goettingen, Goettingen, Germany
| | | | - Sujoy Ghosh
- Program in Cardiovascular and Metabolic Disorders, Duke-NUS Medical School Singapore, Singapore
| | - Manvendra K. Singh
- Program in Cardiovascular and Metabolic Disorders, Duke-NUS Medical School Singapore, Singapore
- National Heart Research Institute Singapore, National Heart Center Singapore, Singapore
- * E-mail:
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21
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Shidlovskii YV, Bylino OV, Shaposhnikov AV, Kachaev ZM, Lebedeva LA, Kolesnik VV, Amendola D, De Simone G, Formicola N, Schedl P, Digilio FA, Giordano E. Subunits of the PBAP Chromatin Remodeler Are Capable of Mediating Enhancer-Driven Transcription in Drosophila. Int J Mol Sci 2021; 22:ijms22062856. [PMID: 33799739 PMCID: PMC7999800 DOI: 10.3390/ijms22062856] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2021] [Revised: 03/03/2021] [Accepted: 03/08/2021] [Indexed: 12/11/2022] Open
Abstract
The chromatin remodeler SWI/SNF is an important participant in gene activation, functioning predominantly by opening the chromatin structure on promoters and enhancers. Here, we describe its novel mode of action in which SWI/SNF factors mediate the targeted action of an enhancer. We studied the functions of two signature subunits of PBAP subfamily, BAP170 and SAYP, in Drosophila. These subunits were stably tethered to a transgene reporter carrying the hsp70 core promoter. The tethered subunits mediate transcription of the reporter in a pattern that is generated by enhancers close to the insertion site in multiple loci throughout the genome. Both tethered SAYP and BAP170 recruit the whole PBAP complex to the reporter promoter. However, we found that BAP170-dependent transcription is more resistant to the depletion of other PBAP subunits, suggesting that BAP170 may play a more critical role in establishing enhancer-dependent transcription.
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Affiliation(s)
- Yulii V. Shidlovskii
- Department of Gene Expression Regulation in Development, Institute of Gene Biology, Russian Academy of Sciences, 119334 Moscow, Russia; (O.V.B.); (A.V.S.); (Z.M.K.); (L.A.L.); (V.V.K.); (P.S.)
- Center for Genetics and Life Science, Sirius University of Science and Technology, 354340 Sochi, Russia
- Department of Biology and General Genetics, Sechenov First Moscow State Medical University (Sechenov University), 119992 Moscow, Russia
- Correspondence: (Y.V.S.); (F.A.D.); (E.G.)
| | - Oleg V. Bylino
- Department of Gene Expression Regulation in Development, Institute of Gene Biology, Russian Academy of Sciences, 119334 Moscow, Russia; (O.V.B.); (A.V.S.); (Z.M.K.); (L.A.L.); (V.V.K.); (P.S.)
| | - Alexander V. Shaposhnikov
- Department of Gene Expression Regulation in Development, Institute of Gene Biology, Russian Academy of Sciences, 119334 Moscow, Russia; (O.V.B.); (A.V.S.); (Z.M.K.); (L.A.L.); (V.V.K.); (P.S.)
| | - Zaur M. Kachaev
- Department of Gene Expression Regulation in Development, Institute of Gene Biology, Russian Academy of Sciences, 119334 Moscow, Russia; (O.V.B.); (A.V.S.); (Z.M.K.); (L.A.L.); (V.V.K.); (P.S.)
- Center for Genetics and Life Science, Sirius University of Science and Technology, 354340 Sochi, Russia
| | - Lyubov A. Lebedeva
- Department of Gene Expression Regulation in Development, Institute of Gene Biology, Russian Academy of Sciences, 119334 Moscow, Russia; (O.V.B.); (A.V.S.); (Z.M.K.); (L.A.L.); (V.V.K.); (P.S.)
| | - Valeria V. Kolesnik
- Department of Gene Expression Regulation in Development, Institute of Gene Biology, Russian Academy of Sciences, 119334 Moscow, Russia; (O.V.B.); (A.V.S.); (Z.M.K.); (L.A.L.); (V.V.K.); (P.S.)
| | - Diego Amendola
- Department of Biology, Università di Napoli Federico II, 80138 Naples, Italy; (D.A.); (G.D.S.)
| | - Giovanna De Simone
- Department of Biology, Università di Napoli Federico II, 80138 Naples, Italy; (D.A.); (G.D.S.)
- Department of Sciences, Roma Tre University, 00154 Rome, Italy
| | - Nadia Formicola
- Institute of Research on Terrestrial Ecosystems (IRET) National Research Council (CNR), 05010 Porano, Italy;
- Institut de Biologie Valrose iBV UMR CNRS 7277, Université Côte d’Azur, 06108 Nice, France
| | - Paul Schedl
- Department of Gene Expression Regulation in Development, Institute of Gene Biology, Russian Academy of Sciences, 119334 Moscow, Russia; (O.V.B.); (A.V.S.); (Z.M.K.); (L.A.L.); (V.V.K.); (P.S.)
- Department of Molecular Biology, Princeton University, Princeton, NJ 08544-1014, USA
| | - Filomena Anna Digilio
- Institute of Research on Terrestrial Ecosystems (IRET) National Research Council (CNR), 05010 Porano, Italy;
- Correspondence: (Y.V.S.); (F.A.D.); (E.G.)
| | - Ennio Giordano
- Department of Biology, Università di Napoli Federico II, 80138 Naples, Italy; (D.A.); (G.D.S.)
- Correspondence: (Y.V.S.); (F.A.D.); (E.G.)
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Transcription Factor RBPJ as a Molecular Switch in Regulating the Notch Response. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2021; 1287:9-30. [PMID: 33034023 DOI: 10.1007/978-3-030-55031-8_2] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The Notch signal transduction cascade requires cell-to-cell contact and results in the proteolytic processing of the Notch receptor and subsequent assembly of a transcriptional coactivator complex containing the Notch intracellular domain (NICD) and transcription factor RBPJ. In the absence of a Notch signal, RBPJ remains at Notch target genes and dampens transcriptional output. Like in other signaling pathways, RBPJ is able to switch from activation to repression by associating with corepressor complexes containing several chromatin-modifying enzymes. Here, we focus on the recent advances concerning RBPJ-corepressor functions, especially in regard to chromatin regulation. We put this into the context of one of the best-studied model systems for Notch, blood cell development. Alterations in the RBPJ-corepressor functions can contribute to the development of leukemia, especially in the case of acute myeloid leukemia (AML). The versatile role of transcription factor RBPJ in regulating pivotal target genes like c-MYC and HES1 may contribute to the better understanding of the development of leukemia.
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Luo KL, Underwood RS, Greenwald I. Positive autoregulation of lag-1 in response to LIN-12 activation in cell fate decisions during C. elegans reproductive system development. Development 2020; 147:dev.193482. [PMID: 32839181 DOI: 10.1242/dev.193482] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Accepted: 08/11/2020] [Indexed: 12/11/2022]
Abstract
During animal development, ligand binding releases the intracellular domain of LIN-12/Notch by proteolytic cleavage to translocate to the nucleus, where it associates with the DNA-binding protein LAG-1/CSL to activate target gene transcription. We investigated the spatiotemporal regulation of LAG-1/CSL expression in Caenorhabditis elegans and observed that an increase in endogenous LAG-1 levels correlates with LIN-12/Notch activation in different cell contexts during reproductive system development. We show that this increase is via transcriptional upregulation by creating a synthetic endogenous operon, and identified an enhancer region that contains multiple LAG-1 binding sites (LBSs) embedded in a more extensively conserved high occupancy target (HOT) region. We show that these LBSs are necessary for upregulation in response to LIN-12/Notch activity, indicating that lag-1 engages in direct positive autoregulation. Deletion of the HOT region from endogenous lag-1 reduced LAG-1 levels and abrogated positive autoregulation, but did not cause hallmark cell fate transformations associated with loss of lin-12/Notch or lag-1 activity. Instead, later somatic reproductive system defects suggest that proper transcriptional regulation of lag-1 confers robustness to somatic reproductive system development.
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Affiliation(s)
- Katherine Leisan Luo
- Integrated Program in Cellular, Molecular and Biophysical Studies, Columbia University Vagelos College of Physicians and Surgeons, New York, NY 10032, USA
| | - Ryan S Underwood
- Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY 10032, USA
| | - Iva Greenwald
- Department of Biological Sciences, Columbia University, New York, NY 10027, USA
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24
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Boukhatmi H, Martins T, Pillidge Z, Kamenova T, Bray S. Notch Mediates Inter-tissue Communication to Promote Tumorigenesis. Curr Biol 2020; 30:1809-1820.e4. [DOI: 10.1016/j.cub.2020.02.088] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2019] [Revised: 02/03/2020] [Accepted: 02/27/2020] [Indexed: 12/19/2022]
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25
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Epigenetic Regulation of Notch Signaling During Drosophila Development. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2020; 1218:59-75. [PMID: 32060871 DOI: 10.1007/978-3-030-34436-8_4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Notch signaling exerts multiple important functions in various developmental processes, including cell differentiation and cell proliferation, while mis-regulation of this pathway results in a variety of complex diseases, such as cancer and developmental defects. The simplicity of the Notch pathway in Drosophila melanogaster, in combination with the availability of powerful genetics, makes this an attractive model for studying the fundamental mechanisms of how Notch signaling is regulated and how it functions in various cellular contexts. Recently, increasing evidence for epigenetic control of Notch signaling reveals the intimate link between epigenetic regulators and Notch signaling pathway. In this chapter, we summarize the research advances of Notch and CAF-1 in Drosophila development and the epigenetic regulation mechanisms of Notch signaling activity by CAF-1 as well as other epigenetic modification machineries, which enables Notch to orchestrate different biological inputs and outputs in specific cellular contexts.
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26
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Vujovic F, Hunter N, Farahani RM. Notch pathway: a bistable inducer of biological noise? Cell Commun Signal 2019; 17:133. [PMID: 31640734 PMCID: PMC6805690 DOI: 10.1186/s12964-019-0453-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Accepted: 10/04/2019] [Indexed: 12/11/2022] Open
Abstract
Notch signalling pathway is central to development of metazoans. The pathway codes a binary fate switch. Upon activation, downstream signals contribute to resolution of fate dichotomies such as proliferation/differentiation or sub-lineage differentiation outcome. There is, however, an interesting paradox in the Notch signalling pathway. Despite remarkable predictability of fate outcomes instructed by the Notch pathway, the associated transcriptome is versatile and plastic. This inconsistency suggests the presence of an interface that compiles input from the plastic transcriptome of the Notch pathway but communicates only a binary output in biological decisions. Herein, we address the interface that determines fate outcomes. We provide an alternative hypothesis for the Notch pathway as a biological master switch that operates by induction of genetic noise and bistability in order to facilitate resolution of dichotomous fate outcomes in development.
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Affiliation(s)
- Filip Vujovic
- IDR/Westmead Institute for Medical Research, Sydney, Australia
- Faculty of Medicine and Health, University of Sydney, Sydney, NSW 2145 Australia
| | - Neil Hunter
- IDR/Westmead Institute for Medical Research, Sydney, Australia
- Faculty of Medicine and Health, University of Sydney, Sydney, NSW 2145 Australia
| | - Ramin M. Farahani
- IDR/Westmead Institute for Medical Research, Sydney, Australia
- Faculty of Medicine and Health, University of Sydney, Sydney, NSW 2145 Australia
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