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Miranda A, Cucchiarini A, Esnault C, Andrau JC, Oliveira PA, Mergny JL, Cruz C. G-quadruplex forming motifs in the promoter region of the B-MYB proto-oncogene. Int J Biol Macromol 2024; 270:132244. [PMID: 38729459 DOI: 10.1016/j.ijbiomac.2024.132244] [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: 01/26/2024] [Revised: 04/10/2024] [Accepted: 05/07/2024] [Indexed: 05/12/2024]
Abstract
To combat cancer, a comprehensive understanding of the molecular mechanisms and behaviors involved in carcinogenesis is crucial, as tumorigenesis is a complex process influenced by various genetic events and disease hallmarks. The B-MYB gene encodes a transcription factor involved in cell cycle regulation, survival, and differentiation in normal cells. B-MYB can be transformed into an oncogene through mutations, and abnormal expression of B-MYB has been identified in various cancers, including lung cancer, and is associated with poor prognosis. Targeting this oncogene is a promising approach for anti-cancer drug design. B-MYB has been deemed undruggable in previous reports, necessitating the search for novel therapeutic options. In this study, we found that the B-MYB gene promoter contains several G/C rich motifs compatible with G-quadruplex (G4) formation. We investigated and validated the existence of G4 structures in the promoter region of B-MYB, first in vitro using a combination of bioinformatics, biophysical, and biochemical methods, then in cell with the recently developed G4access method.
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Affiliation(s)
- André Miranda
- CICS-UBI - Health Sciences Research Centre, University of Beira Interior, Covilhã, Portugal; Centre for Research and Technology of Agro-Environmental and Biological Sciences (CITAB), Inov4Agro, University of Trás-os-Montes and Alto Douro (UTAD), Quinta de Prados, 5000-801 Vila Real, Portugal
| | - Anne Cucchiarini
- Laboratoire d'Optique et Biosciences, École Polytechnique, CNRS, INSERM, Institut Polytechnique de Paris, 91120 Palaiseau, France
| | - Cyril Esnault
- Institut de Génétique Moléculaire de Montpellier, University of Montpellier, CNRS-UMR, 5535 Montpellier, France
| | - Jean-Christophe Andrau
- Institut de Génétique Moléculaire de Montpellier, University of Montpellier, CNRS-UMR, 5535 Montpellier, France
| | - Paula A Oliveira
- Centre for Research and Technology of Agro-Environmental and Biological Sciences (CITAB), Inov4Agro, University of Trás-os-Montes and Alto Douro (UTAD), Quinta de Prados, 5000-801 Vila Real, Portugal
| | - Jean-Louis Mergny
- Laboratoire d'Optique et Biosciences, École Polytechnique, CNRS, INSERM, Institut Polytechnique de Paris, 91120 Palaiseau, France.
| | - Carla Cruz
- CICS-UBI - Health Sciences Research Centre, University of Beira Interior, Covilhã, Portugal; Departamento de Química, Universidade da Beira Interior, Rua Marquês de Ávila e Bolama, 6201-001 Covilhã, Portugal.
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2
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Farhadova S, Ghousein A, Charon F, Surcis C, Gomez-Velazques M, Roidor C, Di Michele F, Borensztein M, De Sario A, Esnault C, Noordermeer D, Moindrot B, Feil R. The long non-coding RNA Meg3 mediates imprinted gene expression during stem cell differentiation. Nucleic Acids Res 2024:gkae247. [PMID: 38613389 DOI: 10.1093/nar/gkae247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Revised: 03/02/2024] [Accepted: 04/03/2024] [Indexed: 04/14/2024] Open
Abstract
The imprinted Dlk1-Dio3 domain comprises the developmental genes Dlk1 and Rtl1, which are silenced on the maternal chromosome in different cell types. On this parental chromosome, the domain's imprinting control region activates a polycistron that produces the lncRNA Meg3 and many miRNAs (Mirg) and C/D-box snoRNAs (Rian). Although Meg3 lncRNA is nuclear and associates with the maternal chromosome, it is unknown whether it controls gene repression in cis. We created mouse embryonic stem cells (mESCs) that carry an ectopic poly(A) signal, reducing RNA levels along the polycistron, and generated Rian-/- mESCs as well. Upon ESC differentiation, we found that Meg3 lncRNA (but not Rian) is required for Dlk1 repression on the maternal chromosome. Biallelic Meg3 expression acquired through CRISPR-mediated demethylation of the paternal Meg3 promoter led to biallelic Dlk1 repression, and to loss of Rtl1 expression. lncRNA expression also correlated with DNA hypomethylation and CTCF binding at the 5'-side of Meg3. Using Capture Hi-C, we found that this creates a Topologically Associating Domain (TAD) organization that brings Meg3 close to Dlk1 on the maternal chromosome. The requirement of Meg3 for gene repression and TAD structure may explain how aberrant MEG3 expression at the human DLK1-DIO3 locus associates with imprinting disorders.
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Affiliation(s)
- Sabina Farhadova
- Institute of Molecular Genetics of Montpellier (IGMM), Centre National de Recherche Scientifique (CNRS), 34090 Montpellier, France
- University of Montpellier, 34090 Montpellier, France
- Genetic Resources Research Institute, Azerbaijan National Academy of Sciences (ANAS), AZ1106 Baku, Azerbaijan
| | - Amani Ghousein
- Institute of Molecular Genetics of Montpellier (IGMM), Centre National de Recherche Scientifique (CNRS), 34090 Montpellier, France
- University of Montpellier, 34090 Montpellier, France
| | - François Charon
- Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC), 91190 Gif-sur-Yvette, France
| | - Caroline Surcis
- Institute of Molecular Genetics of Montpellier (IGMM), Centre National de Recherche Scientifique (CNRS), 34090 Montpellier, France
| | - Melisa Gomez-Velazques
- Institute of Molecular Genetics of Montpellier (IGMM), Centre National de Recherche Scientifique (CNRS), 34090 Montpellier, France
- University of Montpellier, 34090 Montpellier, France
| | - Clara Roidor
- Institute of Molecular Genetics of Montpellier (IGMM), Centre National de Recherche Scientifique (CNRS), 34090 Montpellier, France
- University of Montpellier, 34090 Montpellier, France
| | - Flavio Di Michele
- Institute of Molecular Genetics of Montpellier (IGMM), Centre National de Recherche Scientifique (CNRS), 34090 Montpellier, France
- University of Montpellier, 34090 Montpellier, France
| | - Maud Borensztein
- Institute of Molecular Genetics of Montpellier (IGMM), Centre National de Recherche Scientifique (CNRS), 34090 Montpellier, France
- University of Montpellier, 34090 Montpellier, France
| | - Albertina De Sario
- University of Montpellier, 34090 Montpellier, France
- PhyMedExp, Institut National de la Santé et de la Recherche Médicale (INSERM), CNRS, 34295 Montpellier, France
| | - Cyril Esnault
- Institute of Molecular Genetics of Montpellier (IGMM), Centre National de Recherche Scientifique (CNRS), 34090 Montpellier, France
- University of Montpellier, 34090 Montpellier, France
| | - Daan Noordermeer
- Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC), 91190 Gif-sur-Yvette, France
| | - Benoit Moindrot
- Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC), 91190 Gif-sur-Yvette, France
| | - Robert Feil
- Institute of Molecular Genetics of Montpellier (IGMM), Centre National de Recherche Scientifique (CNRS), 34090 Montpellier, France
- University of Montpellier, 34090 Montpellier, France
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3
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Ghesquières H, Cherblanc F, Belot A, Micon S, Bouabdallah KK, Esnault C, Fornecker LM, Thokagevistk K, Bonjour M, Bijou F, Haioun C, Morineau N, Ysebaert L, Damaj G, Tessoulin B, Guidez S, Morschhauser F, Thiéblemont C, Chauchet A, Gressin R, Jardin F, Fruchart C, Labouré G, Fouillet L, Lionne-Huyghe P, Bonnet A, Lebras L, Amorim S, Leyronnas C, Olivier G, Guieze R, Houot R, Launay V, Drénou B, Fitoussi O, Detourmignies L, Abraham J, Soussain C, Lachenal F, Pica GM, Fogarty P, Cony-Makhoul P, Bernier A, Le Guyader-Peyrou S, Monnereau A, Boissard F, Rossi C, Camus V. Challenges for quality and utilization of real-world data for diffuse large B-cell lymphoma in REALYSA, a LYSA cohort. Blood Adv 2024; 8:296-308. [PMID: 37874913 PMCID: PMC10824688 DOI: 10.1182/bloodadvances.2023010798] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Revised: 09/05/2023] [Accepted: 10/01/2023] [Indexed: 10/26/2023] Open
Abstract
ABSTRACT Real-world data (RWD) are essential to complement clinical trial (CT) data, but major challenges remain, such as data quality. REal world dAta in LYmphoma and Survival in Adults (REALYSA) is a prospective noninterventional multicentric cohort started in 2018 that included patients newly diagnosed with lymphoma in France. Herein is a proof-of-concept analysis on patients with first-line diffuse large B-cell lymphoma (DLBCL) to (1) evaluate the capacity of the cohort to provide robust data through a multistep validation process; (2) assess the consistency of the results; and (3) conduct an exploratory transportability assessment of 2 recent phase 3 CTs (POLARIX and SENIOR). The analysis population comprised 645 patients with DLBCL included before 31 March 2021 who received immunochemotherapy and for whom 3589 queries were generated, resulting in high data completeness (<4% missing data). Median age was 66 years, with mostly advanced-stage disease and high international prognostic index (IPI) score. Treatments were mostly rituximab, cyclophosphamide, doxorubicin hydrochloride, vincristine, and prednisone (R-CHOP 75%) and reduced dose R-CHOP (13%). Estimated 1-year event-free survival (EFS) and overall survival rates were 77.9% and 90.0%, respectively (median follow-up, 9.9 months). Regarding transportability, when applying the CT's main inclusion criteria (age, performance status, and IPI), outcomes seemed comparable between patients in REALYSA and standard arms of POLARIX (1-year progression-free survival 79.8% vs 79.8%) and SENIOR (1-year EFS, 64.5% vs 60.0%). With its rigorous data validation process, REALYSA provides high-quality RWD, thus constituting a platform for numerous scientific purposes. The REALYSA study was registered at www.clinicaltrials.gov as #NCT03869619.
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Affiliation(s)
- Hervé Ghesquières
- Department of Hematology, Hopital Lyon Sud, Claude Bernard Lyon 1 University, Pierre Benite, France
| | - Fanny Cherblanc
- Lymphoma Academic Research Organisation, Hopital Lyon Sud, Pierre Benite, France
| | - Aurélien Belot
- Lymphoma Academic Research Organisation, Hopital Lyon Sud, Pierre Benite, France
| | | | - Krimo K. Bouabdallah
- Hematology and Cell Therapy Department, University Hospital of Bordeaux, Bordeaux, France
| | | | - Luc-Matthieu Fornecker
- Institut de Cancérologie Strasbourg Europe (ICANS) and University of Strasbourg, Strasbourg, France
| | | | - Maxime Bonjour
- Lymphoma Academic Research Organisation, Hopital Lyon Sud, Pierre Benite, France
| | - Fontanet Bijou
- Department of Hematology, Institut Bergonie, Bordeaux, France
| | - Corinne Haioun
- Lymphoid Malignancies Unit, Assistante Publique Hôpitaux de Paris APHP, Hopital Henri Mondor, Creteil, France
| | - Nadine Morineau
- Department of Hematology, Centre Hospitalier Départemental Vendée, La Roche-sur-Yon, France
| | - Loïc Ysebaert
- Institut universitaire du cancer de Toulouse Oncopole, Toulouse, France
| | - Gandhi Damaj
- Hematology Institute of Basse Normandie, Centre Hospitalier Universitaire de Caen, Caen, France
| | - Benoit Tessoulin
- Department of Hematology, Centre Hospitalier Universitaire de Nantes, Nantes, France
| | - Stéphanie Guidez
- Department of Hematology, Centre Hospitalier Universitaire de Poitiers, Poitiers, France
| | - Franck Morschhauser
- Department of Hematology, Universite de Lille, Centre Hospitalier Universitaire de Lille, Groupe de Recherche sur les formes Injectables et les Technologies Associées, Lille, France
| | - Catherine Thiéblemont
- Université Paris Cité, Assistante Publique Hôpitaux de Paris, Hôpital Saint-Louis, Service d’Hémato-Oncologie, Paris, France
| | - Adrien Chauchet
- Department of Hematology, Centre Hospitalier Universitaire de Besançon, Besançon, France
| | - Rémy Gressin
- Department of Hematology, Centre Hospitalier Universitaire de Grenoble, Institute for Advanced Biosciences, INSERM U1209/CNRS UMR 5309/Grenoble Alpes University, Grenoble, France
| | - Fabrice Jardin
- Department of Clinical Hematology, INSERM U1245 Unit, Centre Henri Becquerel, Rouen, France
| | | | - Gaëlle Labouré
- Deparment of Hematology, Centre Hospitalier de Libourne, Libourne, France
| | - Ludovic Fouillet
- Department of Hematology, Centre Hospitalier Universitaire de Saint Etienne, Saint Etienne, France
| | | | - Antoine Bonnet
- Department of Hematology, Centre Hospitalier de Bretagne Atlantique, Vannes, France
| | - Laure Lebras
- Department of Hematology, Leon Berard Cancer Center, Lyon, France
| | - Sandy Amorim
- Department of Hematology, Hopital Saint Vincent de Paul, Lille, France
| | - Cécile Leyronnas
- Department of Hematology, Groupe Hospitalier Mutualiste de Grenoble, Grenoble, France
| | - Gaelle Olivier
- Department of Hematology, Centre Hospitalier de Niort, Niort, France
| | - Romain Guieze
- Department of Hematology, Centre Hospitalier Universitaire de Clermont Ferrand, Clermont Ferrand, France
| | - Roch Houot
- Department of Hematology, Centre Hospitalier Universitaire de Rennes, Rennes, France
| | - Vincent Launay
- Department of Hematology, Centre Hospitalier de Saint Brieuc, Saint Brieuc, France
| | - Bernard Drénou
- Department Hematology, Groupe Hospitalier Mulhouse Sud Alsace, Mulhouse, France
| | - Olivier Fitoussi
- Department of Hematology, Polyclinique Bordeaux Nord Aquitaine, Bordeaux, France
| | | | - Julie Abraham
- Department of Hematology, Centre Hospitalier Universitaire de Limoges, Limoges, France
| | - Carole Soussain
- Department of Hematology, Institut Curie, Saint-Cloud, France
| | - Florence Lachenal
- Department of Hematology, Centre Hospitalier Pierre Oudot, Bourgoin-Jallieu, France
| | - Gian Matteo Pica
- Department of Hematology, Centre Hospitalier Metropole Savoie, Chambery, France
| | - Patrick Fogarty
- Lymphoma Academic Research Organisation, Hopital Lyon Sud, Pierre Benite, France
| | - Pascale Cony-Makhoul
- Lymphoma Academic Research Organisation, Hopital Lyon Sud, Pierre Benite, France
| | - Adeline Bernier
- Lymphoma Academic Research Organisation, Hopital Lyon Sud, Pierre Benite, France
| | - Sandra Le Guyader-Peyrou
- Registre des Hémopathies Malignes de la Gironde, Institut Bergonié, University of Bordeaux, Inserm, Team EPICENE, Bordeaux, France
| | - Alain Monnereau
- Registre des Hémopathies Malignes de la Gironde, Institut Bergonié, University of Bordeaux, Inserm, Team EPICENE, Bordeaux, France
| | | | - Cédric Rossi
- Department of Hematology, Centre Hospitalier Universitaire de Dijon Bourgogne, Dijon, France
| | - Vincent Camus
- Department of Clinical Hematology, INSERM U1245 Unit, Centre Henri Becquerel, Rouen, France
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Yahia Y, Pigeot A, El Aabidine AZ, Shah N, Karasu N, Forné I, Krebs S, Blum H, Esnault C, Sexton T, Imhof A, Eick D, Andrau J. RNA polymerase II CTD is dispensable for transcription and required for termination in human cells. EMBO Rep 2023; 24:e56150. [PMID: 37424514 PMCID: PMC10481650 DOI: 10.15252/embr.202256150] [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: 09/19/2022] [Revised: 06/21/2023] [Accepted: 06/27/2023] [Indexed: 07/11/2023] Open
Abstract
The largest subunit of RNA polymerase (Pol) II harbors an evolutionarily conserved C-terminal domain (CTD), composed of heptapeptide repeats, central to the transcriptional process. Here, we analyze the transcriptional phenotypes of a CTD-Δ5 mutant that carries a large CTD truncation in human cells. Our data show that this mutant can transcribe genes in living cells but displays a pervasive phenotype with impaired termination, similar to but more severe than previously characterized mutations of CTD tyrosine residues. The CTD-Δ5 mutant does not interact with the Mediator and Integrator complexes involved in the activation of transcription and processing of RNAs. Examination of long-distance interactions and CTCF-binding patterns in CTD-Δ5 mutant cells reveals no changes in TAD domains or borders. Our data demonstrate that the CTD is largely dispensable for the act of transcription in living cells. We propose a model in which CTD-depleted Pol II has a lower entry rate onto DNA but becomes pervasive once engaged in transcription, resulting in a defect in termination.
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Affiliation(s)
- Yousra Yahia
- Institut de Génétique Moléculaire de Montpellier (IGMM), CNRS‐UMR5535MontpellierFrance
| | - Alexia Pigeot
- Institut de Génétique Moléculaire de Montpellier (IGMM), CNRS‐UMR5535MontpellierFrance
| | - Amal Zine El Aabidine
- Institut de Génétique Moléculaire de Montpellier (IGMM), CNRS‐UMR5535MontpellierFrance
| | - Nilay Shah
- Department of Molecular Epigenetics, Helmholtz Center MunichCenter of Integrated Protein Science MunichMunichGermany
- Present address:
Neuberg Center for Genomic MedicineNeuberg Supratech Reference LaboratoryGujaratIndia
| | - Nezih Karasu
- Institut de Génétique Moléculaire de Montpellier (IGMM), CNRS‐UMR5535MontpellierFrance
- Institute of Genetics and Molecular and Cellular Biology (IGBMC)IllkirchFrance
| | | | - Stefan Krebs
- Laboratory for Functional Genome Analysis, Gene CenterLudwig‐Maximilians‐UniversitätMunichGermany
| | - Helmut Blum
- Laboratory for Functional Genome Analysis, Gene CenterLudwig‐Maximilians‐UniversitätMunichGermany
| | - Cyril Esnault
- Institut de Génétique Moléculaire de Montpellier (IGMM), CNRS‐UMR5535MontpellierFrance
| | - Tom Sexton
- Institute of Genetics and Molecular and Cellular Biology (IGBMC)IllkirchFrance
| | - Axel Imhof
- Biomedical Center Munich, ZFPMartinsriedGermany
| | - Dirk Eick
- Department of Molecular Epigenetics, Helmholtz Center MunichCenter of Integrated Protein Science MunichMunichGermany
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Esnault C, Magat T, Zine El Aabidine A, Garcia-Oliver E, Cucchiarini A, Bouchouika S, Lleres D, Goerke L, Luo Y, Verga D, Lacroix L, Feil R, Spicuglia S, Mergny JL, Andrau JC. G4access identifies G-quadruplexes and their associations with open chromatin and imprinting control regions. Nat Genet 2023; 55:1359-1369. [PMID: 37400615 DOI: 10.1038/s41588-023-01437-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Accepted: 05/31/2023] [Indexed: 07/05/2023]
Abstract
Metazoan promoters are enriched in secondary DNA structure-forming motifs, such as G-quadruplexes (G4s). Here we describe 'G4access', an approach to isolate and sequence G4s associated with open chromatin via nuclease digestion. G4access is antibody- and crosslinking-independent and enriches for computationally predicted G4s (pG4s), most of which are confirmed in vitro. Using G4access in human and mouse cells, we identify cell-type-specific G4 enrichment correlated with nucleosome exclusion and promoter transcription. G4access allows measurement of variations in G4 repertoire usage following G4 ligand treatment, HDAC and G4 helicases inhibitors. Applying G4access to cells from reciprocal hybrid mouse crosses suggests a role for G4s in the control of active imprinting regions. Consistently, we also observed that G4access peaks are unmethylated, while methylation at pG4s correlates with nucleosome repositioning on DNA. Overall, our study provides a new tool for studying G4s in cellular dynamics and highlights their association with open chromatin, transcription and their antagonism to DNA methylation.
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Affiliation(s)
- Cyril Esnault
- Institut de Génétique Moléculaire de Montpellier, University of Montpellier, CNRS-UMR 5535, Montpellier, France
| | - Talha Magat
- Institut de Génétique Moléculaire de Montpellier, University of Montpellier, CNRS-UMR 5535, Montpellier, France
| | - Amal Zine El Aabidine
- Institut de Génétique Moléculaire de Montpellier, University of Montpellier, CNRS-UMR 5535, Montpellier, France
| | - Encar Garcia-Oliver
- Institut de Génétique Moléculaire de Montpellier, University of Montpellier, CNRS-UMR 5535, Montpellier, France
| | - Anne Cucchiarini
- Laboratoire d'Optique et Biosciences, Ecole Polytechnique, CNRS, Inserm, Institut Polytechnique de Paris, Palaiseau, France
| | - Soumya Bouchouika
- Institut de Génétique Moléculaire de Montpellier, University of Montpellier, CNRS-UMR 5535, Montpellier, France
| | - David Lleres
- Institut de Génétique Moléculaire de Montpellier, University of Montpellier, CNRS-UMR 5535, Montpellier, France
| | - Lutz Goerke
- Institut de Génétique Moléculaire de Montpellier, University of Montpellier, CNRS-UMR 5535, Montpellier, France
| | - Yu Luo
- Laboratoire d'Optique et Biosciences, Ecole Polytechnique, CNRS, Inserm, Institut Polytechnique de Paris, Palaiseau, France
- Université Paris-Saclay, Institut Curie, Orsay, France
| | - Daniela Verga
- Université Paris-Saclay, Institut Curie, Orsay, France
| | - Laurent Lacroix
- Institut de Biologie de l'École Normale Supérieure, ENS, CNRS UMR8197, Inserm U1024, Paris, France
| | - Robert Feil
- Institut de Génétique Moléculaire de Montpellier, University of Montpellier, CNRS-UMR 5535, Montpellier, France
| | - Salvatore Spicuglia
- Aix-Marseille University, INSERM, TAGC, UMR 1090, Marseille, France
- Equipe Labellisée Ligue Contre le Cancer, Marseille, France
| | - Jean-Louis Mergny
- Laboratoire d'Optique et Biosciences, Ecole Polytechnique, CNRS, Inserm, Institut Polytechnique de Paris, Palaiseau, France
| | - Jean-Christophe Andrau
- Institut de Génétique Moléculaire de Montpellier, University of Montpellier, CNRS-UMR 5535, Montpellier, France.
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Esnault C, Rollot M, Guilmin P, Zucker JD. Qluster: An easy-to-implement generic workflow for robust clustering of health data. Front Artif Intell 2023; 5:1055294. [PMID: 36814808 PMCID: PMC9939832 DOI: 10.3389/frai.2022.1055294] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Accepted: 12/22/2022] [Indexed: 02/08/2023] Open
Abstract
The exploration of heath data by clustering algorithms allows to better describe the populations of interest by seeking the sub-profiles that compose it. This therefore reinforces medical knowledge, whether it is about a disease or a targeted population in real life. Nevertheless, contrary to the so-called conventional biostatistical methods where numerous guidelines exist, the standardization of data science approaches in clinical research remains a little discussed subject. This results in a significant variability in the execution of data science projects, whether in terms of algorithms used, reliability and credibility of the designed approach. Taking the path of parsimonious and judicious choice of both algorithms and implementations at each stage, this article proposes Qluster, a practical workflow for performing clustering tasks. Indeed, this workflow makes a compromise between (1) genericity of applications (e.g. usable on small or big data, on continuous, categorical or mixed variables, on database of high-dimensionality or not), (2) ease of implementation (need for few packages, few algorithms, few parameters, ...), and (3) robustness (e.g. use of proven algorithms and robust packages, evaluation of the stability of clusters, management of noise and multicollinearity). This workflow can be easily automated and/or routinely applied on a wide range of clustering projects. It can be useful both for data scientists with little experience in the field to make data clustering easier and more robust, and for more experienced data scientists who are looking for a straightforward and reliable solution to routinely perform preliminary data mining. A synthesis of the literature on data clustering as well as the scientific rationale supporting the proposed workflow is also provided. Finally, a detailed application of the workflow on a concrete use case is provided, along with a practical discussion for data scientists. An implementation on the Dataiku platform is available upon request to the authors.
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Affiliation(s)
- Cyril Esnault
- Quinten, Paris, France,*Correspondence: Cyril Esnault ✉
| | | | | | - Jean-Daniel Zucker
- Sorbonne University, IRD, UMMISCO, Bondy, France,Sorbonne University, INSERM, NUTRIOMICS, Paris, France
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7
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Durand M, Mouchard A, Esnault C, Samimi M, Kervarrec T, Touzé A. 250 EZH2, a potential therapeutic target in Merkel cell carcinoma. J Invest Dermatol 2021. [DOI: 10.1016/j.jid.2021.08.256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Esnault C, Leblond V, Martin C, Desgranges A, Houben R, Schrama D, Guyétant S, Samimi M, Touzé A, Kervarrec T. 254 Adcitmer®, a new CD56-targeting MMAE-conjugated antibody is a potential therapeutic approach in Merkel cell carcinoma. J Invest Dermatol 2021. [DOI: 10.1016/j.jid.2021.08.260] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Esnault C, Leblond V, Martin C, Desgranges A, Baltus CB, Aubrey N, Lakhrif Z, Lajoie L, Lantier L, Clémenceau B, Sarma B, Schrama J, Houben R, Schrama D, Hesbacher S, Gouilleux-Gruart V, Feng Y, Dimitrov D, Guyétant S, Berthon P, Viaud-Massuard MC, Samimi M, Touzé A, Kervarrec T. Adcitmer ® , a new CD56-targeting monomethyl auristatin E-conjugated antibody, is a potential therapeutic approach in Merkel cell carcinoma. Br J Dermatol 2021; 186:295-306. [PMID: 34582565 DOI: 10.1111/bjd.20770] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/28/2021] [Indexed: 01/08/2023]
Abstract
BACKGROUND Merkel cell carcinoma (MCC) is an aggressive skin cancer, whose tumour cells often express CD56. While immune checkpoint inhibitors constitute a major advance for treating patients with MCC with advanced disease, new therapeutic options are still urgently required. OBJECTIVES To produce and evaluate the therapeutic performance of a new antibody-drug conjugate (Adcitmer® ) targeting CD56 in preclinical models of MCC. METHODS CD56 expression was evaluated in a MCC cohort (immunohistochemistry on a tissue microarray of 90 tumour samples) and MCC cell lines. Interaction of an unconjugated CD56-targeting antibody with CD56+ MCC cell lines was investigated by immunohistochemistry and imaging flow cytometry. Adcitmer® product was generated by the bioconjugation of CD56-targeting antibody to a cytotoxic drug (monomethyl auristatin E) using the McSAF Inside® bioconjugation process. The chemical properties and homogeneity of Adcitmer® were characterized by hydrophobic interaction chromatography. Adcitmer® cytotoxicity was evaluated in vitro and in an MCC xenograft mice model. RESULTS Similar to previous reports, CD56 was expressed by 66% of MCC tumours in our cohort, confirming its relevance as a therapeutic target. Specific binding and internalization of the unconjugated CD56-targeting antibody was validated in MCC cell lines. The high homogeneity of the newly generated Adcitmer® was confirmed by hydrophobic interaction chromatography. The CD56-mediated cytotoxicity of Adcitmer® was demonstrated in vitro in MCC cell lines. Moreover, Adcitmer® significantly reduced tumour growth in a MCC mouse model. CONCLUSIONS Our study suggests that Adcitmer® should be further assessed as a therapeutic option in patients with MCC, as an alternative therapy or combined with immune checkpoint inhibitors.
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Affiliation(s)
- C Esnault
- Team 'Biologie des Infections à Polyomavirus', ISP UMR 1282, INRAE, Université de Tours, Tours, 37200, France.,Department of Dermatology, Venereology and Allergology, University Hospital Würzburg, Würzburg, 97080, Germany
| | - V Leblond
- Team 'Biologie des Infections à Polyomavirus', ISP UMR 1282, INRAE, Université de Tours, Tours, 37200, France
| | | | | | | | - N Aubrey
- Team BIOMAP, ISP UMR 1282, INRAE, Université de Tours, Tours, 37200, France
| | - Z Lakhrif
- Team BIOMAP, ISP UMR 1282, INRAE, Université de Tours, Tours, 37200, France
| | - L Lajoie
- Team FRAME, GICC EA7501, Université de Tours, Tours, 37200, France.,Plateforme Scientifique et Technique, Analyse des Systèmes Biologiques Département des Cytométries, Université de Tours, Tours, 37200, France
| | - L Lantier
- Team BIOMAP, ISP UMR 1282, INRAE, Université de Tours, Tours, 37200, France
| | - B Clémenceau
- CRCINA, INSERM, CNRS, Université d'Angers, Université de Nantes, Nantes, France.,LabEx IGO 'Immunotherapy, Graft, Oncology', Nantes, France.,CHU de Nantes, Hôtel Dieu, Nantes, F-44000, France
| | - B Sarma
- Department of Dermatology, Venereology and Allergology, University Hospital Würzburg, Würzburg, 97080, Germany
| | - J Schrama
- Department of Dermatology, Venereology and Allergology, University Hospital Würzburg, Würzburg, 97080, Germany
| | - R Houben
- Department of Dermatology, Venereology and Allergology, University Hospital Würzburg, Würzburg, 97080, Germany
| | - D Schrama
- Department of Dermatology, Venereology and Allergology, University Hospital Würzburg, Würzburg, 97080, Germany
| | - S Hesbacher
- Department of Dermatology, Venereology and Allergology, University Hospital Würzburg, Würzburg, 97080, Germany
| | | | - Y Feng
- Tumor Angiogenesis Unit, Mouse Cancer Genetics Program, NCI at Frederick, Frederick, MD, 21702, USA
| | - D Dimitrov
- Protein Interactions Section, Cancer and Inflammation Program, Center for Cancer Research, National Cancer Institute, Frederick, MD, USA
| | - S Guyétant
- Team 'Biologie des Infections à Polyomavirus', ISP UMR 1282, INRAE, Université de Tours, Tours, 37200, France.,Department of Pathology, Université de Tours, CHU de Tours, Chambray-les-Tours, 37170, France
| | - P Berthon
- Team 'Biologie des Infections à Polyomavirus', ISP UMR 1282, INRAE, Université de Tours, Tours, 37200, France
| | - M C Viaud-Massuard
- McSAF, Tours, 37200, France.,Team IMT, GICC EA7501, Université de Tours, Tours, 37200, France
| | - M Samimi
- Team 'Biologie des Infections à Polyomavirus', ISP UMR 1282, INRAE, Université de Tours, Tours, 37200, France.,Department of Dermatology, Université de Tours, CHU de Tours, Chambray-les-Tours, 37170, France
| | - A Touzé
- Team 'Biologie des Infections à Polyomavirus', ISP UMR 1282, INRAE, Université de Tours, Tours, 37200, France
| | - T Kervarrec
- Team 'Biologie des Infections à Polyomavirus', ISP UMR 1282, INRAE, Université de Tours, Tours, 37200, France.,Department of Dermatology, Venereology and Allergology, University Hospital Würzburg, Würzburg, 97080, Germany.,Department of Pathology, Université de Tours, CHU de Tours, Chambray-les-Tours, 37170, France
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10
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Gourvennec J, Guibon R, Berry F, Durand M, Esnault C, Thanguturi S, Guyetant S, Kervarrec T, Fromont G. Le CaSR, un potentiel marqueur diagnostique dans le carcinome à cellules de Merkel. Ann Pathol 2021. [DOI: 10.1016/j.annpat.2021.07.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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11
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Guardiola C, Bachiller-Perea D, Prieto-Pena J, Jiménez-Ramos MC, García López J, Esnault C, Fleta C, Quirion D, Gómez F. Microdosimetry in low energy proton beam at therapeutic-equivalent fluence rate with silicon 3D-cylindrical microdetectors. Phys Med Biol 2021; 66. [PMID: 33853055 DOI: 10.1088/1361-6560/abf811] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [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: 09/30/2020] [Accepted: 04/14/2021] [Indexed: 11/11/2022]
Abstract
In this work we show the first microdosimetry measurements on a low energy proton beam with therapeutic-equivalent fluence rates by using the second generation of 3D-cylindrical microdetectors. The sensors belong to an improved version of a novel silicon-based 3D-microdetector design with electrodes etched inside silicon, which were manufactured at the National Microelectronics Centre (IMB-CNM, CSIC) in Spain. A new microtechnology has been employed using quasi-toroid electrodes of 25μm diameter and a depth of 20μm within the silicon bulk, resulting in a well-defined cylindrical radiation sensitive volume. These detectors were tested at the 18 MeV proton beamline of the cyclotron at the National Accelerator Centre (CNA, Spain). They were assembled into an in-house low-noise readout electronics to assess their performance at a therapeutic-equivalent fluence rate. Microdosimetry spectra of lineal energy were recorded at several proton energies starting from 18 MeV by adding 50μm thick tungsten foils gradually at the exit-window of the cyclotron external beamline, which corresponds to different depths along the Bragg curve. The experimentalyF¯values in silicon cover from (5.7 ± 0.9) to (8.5 ± 0.4) keV μm-1in the entrance to (27.4 ± 2.3) keV μm-1in the distal edge. Pulse height energy spectra were crosschecked with Monte Carlo simulations and an excellent agreement was obtained. This work demonstrates the capability of the second generation 3D-microdetectors to assess accurate microdosimetric distributions at fluence rates as high as those used in clinical centers in proton therapy.
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Affiliation(s)
- C Guardiola
- Université Paris-Saclay, CNRS/IN2P3, IJCLab, F-91405 Orsay, France.,Université de Paris, IJCLab, F-91405 Orsay France
| | - D Bachiller-Perea
- Université Paris-Saclay, CNRS/IN2P3, IJCLab, F-91405 Orsay, France.,Université de Paris, IJCLab, F-91405 Orsay France
| | - J Prieto-Pena
- Departamento de Física de Partículas, Universidad de Santiago de Compostela, E-15782, Spain
| | | | - J García López
- Centro Nacional de Aceleradores, E-41092 Sevilla, Spain.,Departamento de Física Atómica, Molecular y Nuclear, University of Sevilla, E-41080, Sevilla, Spain
| | - C Esnault
- Université Paris-Saclay, CNRS/IN2P3, IJCLab, F-91405 Orsay, France.,Université de Paris, IJCLab, F-91405 Orsay France
| | - C Fleta
- Centro Nacional de Microelectrónica (IMB-CNM, CSIC), Bellaterra, E-08193, Spain
| | - D Quirion
- Centro Nacional de Microelectrónica (IMB-CNM, CSIC), Bellaterra, E-08193, Spain
| | - F Gómez
- Departamento de Física de Partículas, Universidad de Santiago de Compostela, E-15782, Spain
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12
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Esnault C, Gadonna ML, Queyrel M, Templier A, Zucker JD. Q-Finder: An Algorithm for Credible Subgroup Discovery in Clinical Data Analysis - An Application to the International Diabetes Management Practice Study. Front Artif Intell 2020; 3:559927. [PMID: 33733209 PMCID: PMC7861304 DOI: 10.3389/frai.2020.559927] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [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: 05/07/2020] [Accepted: 09/22/2020] [Indexed: 11/13/2022] Open
Abstract
Addressing the heterogeneity of both the outcome of a disease and the treatment response to an intervention is a mandatory pathway for regulatory approval of medicines. In randomized clinical trials (RCTs), confirmatory subgroup analyses focus on the assessment of drugs in predefined subgroups, while exploratory ones allow a posteriori the identification of subsets of patients who respond differently. Within the latter area, subgroup discovery (SD) data mining approach is widely used-particularly in precision medicine-to evaluate treatment effect across different groups of patients from various data sources (be it from clinical trials or real-world data). However, both the limited consideration by standard SD algorithms of recommended criteria to define credible subgroups and the lack of statistical power of the findings after correcting for multiple testing hinder the generation of hypothesis and their acceptance by healthcare authorities and practitioners. In this paper, we present the Q-Finder algorithm that aims to generate statistically credible subgroups to answer clinical questions, such as finding drivers of natural disease progression or treatment response. It combines an exhaustive search with a cascade of filters based on metrics assessing key credibility criteria, including relative risk reduction assessment, adjustment on confounding factors, individual feature's contribution to the subgroup's effect, interaction tests for assessing between-subgroup treatment effect interactions and tests adjustment (multiple testing). This allows Q-Finder to directly target and assess subgroups on recommended credibility criteria. The top-k credible subgroups are then selected, while accounting for subgroups' diversity and, possibly, clinical relevance. Those subgroups are tested on independent data to assess their consistency across databases, while preserving statistical power by limiting the number of tests. To illustrate this algorithm, we applied it on the database of the International Diabetes Management Practice Study (IDMPS) to better understand the drivers of improved glycemic control and rate of episodes of hypoglycemia in type 2 diabetics patients. We compared Q-Finder with state-of-the-art approaches from both Subgroup Identification and Knowledge Discovery in Databases literature. The results demonstrate its ability to identify and support a short list of highly credible and diverse data-driven subgroups for both prognostic and predictive tasks.
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Affiliation(s)
| | | | - Maxence Queyrel
- Quinten France, Paris, France
- Sorbonne University, IRD, UMMISCO, Bondy, France
| | | | - Jean-Daniel Zucker
- Sorbonne University, IRD, UMMISCO, Bondy, France
- Sorbonne University, INSERM, NUTRIOMICS, Paris, France
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13
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Durand M, Esnault C, Schrama D, Houben R, Samimi M, Kervarrec T, Touzé A. EZH2, une cible thérapeutique potentielle dans le carcinome à cellules de Merkel. Ann Dermatol Venereol 2020. [DOI: 10.1016/j.annder.2020.08.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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14
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Esnault C, Leblond V, Aubrey N, Houben R, Schrama D, Desgranges A, Guyétant S, Samimi M, Kervarrec T, Touzé A. Une nouvelle approche thérapeutique ciblant le CD56 dans le carcinome à cellules de Merkel. Ann Dermatol Venereol 2020. [DOI: 10.1016/j.annder.2020.08.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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15
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Zhou FL, Watada H, Tajima Y, Berthelot M, Kang D, Esnault C, Shuto Y, Maegawa H, Koya D. Identification of subgroups of patients with type 2 diabetes with differences in renal function preservation, comparing patients receiving sodium-glucose co-transporter-2 inhibitors with those receiving dipeptidyl peptidase-4 inhibitors, using a supervised machine-learning algorithm (PROFILE study): A retrospective analysis of a Japanese commercial medical database. Diabetes Obes Metab 2019; 21:1925-1934. [PMID: 31050099 PMCID: PMC6771907 DOI: 10.1111/dom.13753] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [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: 01/27/2019] [Revised: 04/17/2019] [Accepted: 04/30/2019] [Indexed: 12/25/2022]
Abstract
AIMS To investigate the effects of sodium-glucose co-transporter-2 (SGLT2) inhibitors vs. dipeptidyl peptidase-4 (DPP-4) inhibitors on renal function preservation (RFP) using real-world data of patients with type 2 diabetes in Japan, and to identify which subgroups of patients obtained greater RFP benefits with SGLT2 inhibitors vs. DPP-4 inhibitors. METHODS We retrospectively analysed claims data recorded in the Medical Data Vision database in Japan of patients with type 2 diabetes (aged ≥18 years) prescribed any SGLT2 inhibitor or any DPP-4 inhibitor between May 2014 and September 2016 (identification period), in whom estimated glomerular filtration rate (eGFR) was measured at least twice (baseline, up to 6 months before the index date; follow-up, 9 to 15 months after the index date) with continuous treatment until the follow-up eGFR. The endpoint was the percentage of patients with RFP, defined as no change or an increase in eGFR from baseline to follow-up. A proprietary supervised learning algorithm (Q-Finder; Quinten, Paris, France) was used to identify the profiles of patients with an additional RFP benefit of SGLT2 inhibitors vs. DPP-4 inhibitors. RESULTS Data were available for 990 patients prescribed SGLT2 inhibitors and 4257 prescribed DPP-4 inhibitors. The proportion of patients with RFP was significantly greater in the SGLT2 inhibitor group (odds ratio 1.27; P = 0.01). The Q-Finder algorithm identified four clinically relevant subgroups showing superior RFP with SGLT2 inhibitors (P < 0.1): no hyperlipidaemia and eGFR ≥79 mL/min/1.73 m2 ; eGFR ≥79 mL/min/1.73 m2 and diabetes duration ≤1.2 years; eGFR ≥75 mL/min/1.73 m2 and use of antithrombotic agents; and haemoglobin ≤13.4 g/dL and LDL cholesterol ≥95.1 mg/dL. In each profile, glycaemic control was similar in the two groups. CONCLUSION SGLT2 inhibitors were associated with more favourable RFP vs. DPP-4 inhibitors in patients with certain profiles in real-world settings in Japan.
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Affiliation(s)
- Fang L. Zhou
- Real World Evidence Generation, SanofiBridgewaterNew Jersey
| | - Hirotaka Watada
- Department of Metabolism and Endocrinology, Juntendo University Graduate School of MedicineTokyoJapan
| | | | | | - Dian Kang
- Data Science Consulting, QuintenParisFrance
| | | | | | - Hiroshi Maegawa
- Department of Medicine, Shiga University of Medical ScienceOtsuJapan
| | - Daisuke Koya
- Department of Diabetology and Endocrinology, Kanazawa Medical UniversityUchinadaJapan
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16
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Esnault C, Génin M, Ekhtiari S, Civet A. Estimer l’efficacité d’un traitement en vie réelle (VR) à partir d’une étude clinique randomisée (RCT) : une approche utilisant le suréchantillonnage. Rev Epidemiol Sante Publique 2019. [DOI: 10.1016/j.respe.2019.04.030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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17
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Shah N, Maqbool MA, Yahia Y, El Aabidine AZ, Esnault C, Forné I, Decker TM, Martin D, Schüller R, Krebs S, Blum H, Imhof A, Eick D, Andrau JC. Tyrosine-1 of RNA Polymerase II CTD Controls Global Termination of Gene Transcription in Mammals. Mol Cell 2018; 69:48-61.e6. [PMID: 29304333 DOI: 10.1016/j.molcel.2017.12.009] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [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: 04/28/2017] [Revised: 10/30/2017] [Accepted: 12/11/2017] [Indexed: 12/20/2022]
Abstract
The carboxy-terminal domain (CTD) of RNA polymerase (Pol) II is composed of a repetition of YSPTSPS heptads and functions as a loading platform for protein complexes that regulate transcription, splicing, and maturation of RNAs. Here, we studied mammalian CTD mutants to analyze the function of tyrosine1 residues in the transcription cycle. Mutation of 3/4 of the tyrosine residues (YFFF mutant) resulted in a massive read-through transcription phenotype in the antisense direction of promoters as well as in the 3' direction several hundred kilobases downstream of genes. The YFFF mutant shows reduced Pol II at promoter-proximal pause sites, a loss of interaction with the Mediator and Integrator complexes, and impaired recruitment of these complexes to chromatin. Consistent with these observations, Pol II loading at enhancers and maturation of snRNAs are altered in the YFFF context genome-wide. We conclude that tyrosine1 residues of the CTD control termination of transcription by Pol II.
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Affiliation(s)
- Nilay Shah
- Department of Molecular Epigenetics, Helmholtz Center Munich and Center for Integrated Protein Science Munich (CIPSM), Marchioninistrasse 25, 81377 Munich, Germany
| | - Muhammad Ahmad Maqbool
- Institut de Génétique Moléculaire de Montpellier (IGMM), Univ Montpellier, CNRS, Montpellier, France
| | - Yousra Yahia
- Institut de Génétique Moléculaire de Montpellier (IGMM), Univ Montpellier, CNRS, Montpellier, France
| | - Amal Zine El Aabidine
- Institut de Génétique Moléculaire de Montpellier (IGMM), Univ Montpellier, CNRS, Montpellier, France
| | - Cyril Esnault
- Institut de Génétique Moléculaire de Montpellier (IGMM), Univ Montpellier, CNRS, Montpellier, France
| | - Ignasi Forné
- Biomedical Center Munich, ZFP, Großhaderner Strasse 9, 82152 Planegg-Martinsried, Germany
| | - Tim-Michael Decker
- Department of Molecular Epigenetics, Helmholtz Center Munich and Center for Integrated Protein Science Munich (CIPSM), Marchioninistrasse 25, 81377 Munich, Germany
| | - David Martin
- Institut de Génétique Moléculaire de Montpellier (IGMM), Univ Montpellier, CNRS, Montpellier, France
| | - Roland Schüller
- Department of Molecular Epigenetics, Helmholtz Center Munich and Center for Integrated Protein Science Munich (CIPSM), Marchioninistrasse 25, 81377 Munich, Germany
| | - Stefan Krebs
- Laboratory for Functional Genome Analysis, Gene Center, Ludwig-Maximilians-Universität, Munich, Germany
| | - Helmut Blum
- Laboratory for Functional Genome Analysis, Gene Center, Ludwig-Maximilians-Universität, Munich, Germany
| | - Axel Imhof
- Biomedical Center Munich, ZFP, Großhaderner Strasse 9, 82152 Planegg-Martinsried, Germany
| | - Dirk Eick
- Department of Molecular Epigenetics, Helmholtz Center Munich and Center for Integrated Protein Science Munich (CIPSM), Marchioninistrasse 25, 81377 Munich, Germany.
| | - Jean-Christophe Andrau
- Institut de Génétique Moléculaire de Montpellier (IGMM), Univ Montpellier, CNRS, Montpellier, France.
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18
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Esnault C, Gualdrini F, Horswell S, Kelly G, Stewart A, East P, Matthews N, Treisman R. ERK-Induced Activation of TCF Family of SRF Cofactors Initiates a Chromatin Modification Cascade Associated with Transcription. Mol Cell 2017; 65:1081-1095.e5. [PMID: 28286024 PMCID: PMC5364370 DOI: 10.1016/j.molcel.2017.02.005] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [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: 05/19/2016] [Revised: 12/19/2016] [Accepted: 02/06/2017] [Indexed: 12/20/2022]
Abstract
We investigated the relationship among ERK signaling, histone modifications, and transcription factor activity, focusing on the ERK-regulated ternary complex factor family of SRF partner proteins. In MEFs, activation of ERK by TPA stimulation induced a common pattern of H3K9acS10ph, H4K16ac, H3K27ac, H3K9acK14ac, and H3K4me3 at hundreds of transcription start site (TSS) regions and remote regulatory sites. The magnitude of the increase in histone modification correlated well with changes in transcription. H3K9acS10ph preceded the other modifications. Most induced changes were TCF dependent, but TCF-independent TSSs exhibited the same hierarchy, indicating that it reflects gene activation per se. Studies with TCF Elk-1 mutants showed that TCF-dependent ERK-induced histone modifications required Elk-1 to be phosphorylated and competent to activate transcription. Analysis of direct TCF-SRF target genes and chromatin modifiers confirmed this and showed that H3S10ph required only Elk-1 phosphorylation. Induction of histone modifications following ERK stimulation is thus directed by transcription factor activation and transcription.
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Affiliation(s)
- Cyril Esnault
- Signalling and Transcription Group, Francis Crick Institute, 1 Midland Road, London NW1 1AT, UK
| | - Francesco Gualdrini
- Signalling and Transcription Group, Francis Crick Institute, 1 Midland Road, London NW1 1AT, UK
| | - Stuart Horswell
- Bioinformatics and Biostatistics STP, Francis Crick Institute, 1 Midland Road, London NW1 1AT, UK
| | - Gavin Kelly
- Bioinformatics and Biostatistics STP, Francis Crick Institute, 1 Midland Road, London NW1 1AT, UK
| | - Aengus Stewart
- Bioinformatics and Biostatistics STP, Francis Crick Institute, 1 Midland Road, London NW1 1AT, UK
| | - Phil East
- Bioinformatics and Biostatistics STP, Francis Crick Institute, 1 Midland Road, London NW1 1AT, UK
| | - Nik Matthews
- Advanced Sequencing STP, Francis Crick Institute, 1 Midland Road, London NW1 1AT, UK
| | - Richard Treisman
- Signalling and Transcription Group, Francis Crick Institute, 1 Midland Road, London NW1 1AT, UK.
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19
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Gualdrini F, Esnault C, Horswell S, Stewart A, Matthews N, Treisman R. SRF Co-factors Control the Balance between Cell Proliferation and Contractility. Mol Cell 2016; 64:1048-1061. [PMID: 27867007 PMCID: PMC5179500 DOI: 10.1016/j.molcel.2016.10.016] [Citation(s) in RCA: 104] [Impact Index Per Article: 13.0] [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: 08/15/2016] [Revised: 09/26/2016] [Accepted: 10/11/2016] [Indexed: 12/20/2022]
Abstract
The ERK-regulated ternary complex factors (TCFs) act with the transcription factor serum response factor (SRF) to activate mitogen-induced transcription. However, the extent of their involvement in the immediate-early transcriptional response, and their wider functional significance, has remained unclear. We show that, in MEFs, TCF inactivation significantly inhibits over 60% of TPA-inducible gene transcription and impairs cell proliferation. Using integrated SRF ChIP-seq and Hi-C data, we identified over 700 TCF-dependent SRF direct target genes involved in signaling, transcription, and proliferation. These also include a significant number of cytoskeletal gene targets for the Rho-regulated myocardin-related transcription factor (MRTF) SRF cofactor family. The TCFs act as general antagonists of MRTF-dependent SRF target gene expression, competing directly with the MRTFs for access to SRF. As a result, TCF-deficient MEFs exhibit hypercontractile and pro-invasive behavior. Thus, competition between TCFs and MRTFs for SRF determines the balance between antagonistic proliferative and contractile programs of gene expression.
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Affiliation(s)
- Francesco Gualdrini
- Signalling and Transcription Group, Francis Crick Institute, 1 Midland Rd, London NW1 1AT, UK
| | - Cyril Esnault
- Signalling and Transcription Group, Francis Crick Institute, 1 Midland Rd, London NW1 1AT, UK
| | - Stuart Horswell
- Bioinformatics and Biostatistics STP, Francis Crick Institute, 1 Midland Rd, London NW1 1AT, UK
| | - Aengus Stewart
- Bioinformatics and Biostatistics STP, Francis Crick Institute, 1 Midland Rd, London NW1 1AT, UK
| | - Nik Matthews
- Advanced Sequencing STP, Francis Crick Institute, 1 Midland Rd, London NW1 1AT, UK
| | - Richard Treisman
- Signalling and Transcription Group, Francis Crick Institute, 1 Midland Rd, London NW1 1AT, UK.
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20
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Wiese KE, Haikala HM, von Eyss B, Wolf E, Esnault C, Rosenwald A, Treisman R, Klefström J, Eilers M. Repression of SRF target genes is critical for Myc-dependent apoptosis of epithelial cells. EMBO J 2015; 34:1554-71. [PMID: 25896507 PMCID: PMC4474530 DOI: 10.15252/embj.201490467] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [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: 11/05/2014] [Revised: 03/28/2015] [Accepted: 03/30/2015] [Indexed: 12/22/2022] Open
Abstract
Oncogenic levels of Myc expression sensitize cells to multiple apoptotic stimuli, and this protects long-lived organisms from cancer development. How cells discriminate physiological from supraphysiological levels of Myc is largely unknown. Here, we show that induction of apoptosis by Myc in breast epithelial cells requires association of Myc with Miz1. Gene expression and ChIP-Sequencing experiments show that high levels of Myc invade target sites that lack consensus E-boxes in a complex with Miz1 and repress transcription. Myc/Miz1-repressed genes encode proteins involved in cell adhesion and migration and include several integrins. Promoters of repressed genes are enriched for binding sites of the serum-response factor (SRF). Restoring SRF activity antagonizes Myc repression of SRF target genes, attenuates Myc-induced apoptosis, and reverts a Myc-dependent decrease in Akt phosphorylation and activity, a well-characterized suppressor of Myc-induced apoptosis. We propose that high levels of Myc engage Miz1 in repressive DNA binding complexes and suppress an SRF-dependent transcriptional program that supports survival of epithelial cells.
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Affiliation(s)
- Katrin E Wiese
- Biocenter Theodor Boveri Institute University of Würzburg, Würzburg, Germany
| | - Heidi M Haikala
- Faculty of Medicine, Cancer Cell Circuitry Laboratory, Translational Cancer Biology Research Program and Institute of Biomedicine Biomedicum Helsinki University of Helsinki, Helsinki, Finland
| | - Björn von Eyss
- Biocenter Theodor Boveri Institute University of Würzburg, Würzburg, Germany
| | - Elmar Wolf
- Biocenter Theodor Boveri Institute University of Würzburg, Würzburg, Germany
| | - Cyril Esnault
- Cancer Research UK London Research Institute Lincoln's Inn Fields Laboratories Transcription Laboratory, London, UK
| | - Andreas Rosenwald
- Institute of Pathology University of Würzburg, Würzburg, Germany Comprehensive Cancer Center Mainfranken University of Würzburg, Würzburg, Germany
| | - Richard Treisman
- Cancer Research UK London Research Institute Lincoln's Inn Fields Laboratories Transcription Laboratory, London, UK
| | - Juha Klefström
- Faculty of Medicine, Cancer Cell Circuitry Laboratory, Translational Cancer Biology Research Program and Institute of Biomedicine Biomedicum Helsinki University of Helsinki, Helsinki, Finland
| | - Martin Eilers
- Biocenter Theodor Boveri Institute University of Würzburg, Würzburg, Germany Comprehensive Cancer Center Mainfranken University of Würzburg, Würzburg, Germany
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21
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Costello P, Sargent M, Maurice D, Esnault C, Foster K, Anjos-Afonso F, Treisman R. MRTF-SRF signaling is required for seeding of HSC/Ps in bone marrow during development. Blood 2015; 125:1244-55. [PMID: 25573994 PMCID: PMC4335080 DOI: 10.1182/blood-2014-08-595603] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [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: 08/19/2014] [Accepted: 12/30/2014] [Indexed: 12/18/2022] Open
Abstract
Chemokine signaling is important for the seeding of different sites by hematopoietic stem cells (HSCs) during development. Serum response factor (SRF) controls multiple genes governing adhesion and migration, mainly by recruiting members of the myocardin-related transcription factor (MRTF) family of G-actin-regulated cofactors. We used vav-iCre to inactivate MRTF-SRF signaling early during hematopoietic development. In both Srf- and Mrtf-deleted animals, hematopoiesis in fetal liver and spleen is intact but does not become established in fetal bone marrow. Srf-null HSC progenitor cells (HSC/Ps) fail to effectively engraft in transplantation experiments, exhibiting normal proximal signaling responses to SDF-1, but reduced adhesiveness, F-actin assembly, and reduced motility. Srf-null HSC/Ps fail to polarize in response to SDF-1 and cannot migrate through restrictive membrane pores to SDF-1 or Scf in vitro. Mrtf-null HSC/Ps were also defective in chemotactic responses to SDF-1. Srf-null HSC/Ps exhibit substantial deficits in cytoskeletal gene expression. MRTF-SRF signaling is thus critical for expression of genes required for the response to chemokine signaling during hematopoietic development.
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Affiliation(s)
| | | | | | | | - Katie Foster
- Haematopoietic Stem Cell Laboratory, Cancer Research UK, London Research Institute, Lincoln's Inn Fields Laboratories, London, United Kingdom
| | - Fernando Anjos-Afonso
- Haematopoietic Stem Cell Laboratory, Cancer Research UK, London Research Institute, Lincoln's Inn Fields Laboratories, London, United Kingdom
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22
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Esnault C, Stewart A, Gualdrini F, East P, Horswell S, Matthews N, Treisman R. Rho-actin signaling to the MRTF coactivators dominates the immediate transcriptional response to serum in fibroblasts. Genes Dev 2014; 28:943-58. [PMID: 24732378 PMCID: PMC4018493 DOI: 10.1101/gad.239327.114] [Citation(s) in RCA: 252] [Impact Index Per Article: 25.2] [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: 02/03/2014] [Accepted: 03/20/2014] [Indexed: 01/14/2023]
Abstract
The transcription factor SRF (serum response factor) recruits two families of coactivators, the MRTFs (myocardin-related transcription factors) and the TCFs (ternary complex factors), to couple gene transcription to growth factor signaling. Here we investigated the role of the SRF network in the immediate transcriptional response of fibroblasts to serum stimulation. SRF recruited its cofactors in a gene-specific manner, and virtually all MRTF binding was directed by SRF. Much of SRF DNA binding was serum-inducible, reflecting a requirement for MRTF-SRF complex formation in nucleosome displacement. We identified 960 serum-responsive SRF target genes, which were mostly MRTF-controlled, as assessed by MRTF chromatin immunoprecipitation (ChIP) combined with deep sequencing (ChIP-seq) and/or sensitivity to MRTF-linked signals. MRTF activation facilitates RNA polymerase II (Pol II) recruitment or promoter escape according to gene context. MRTF targets encode regulators of the cytoskeleton, transcription, and cell growth, underpinning the role of SRF in cytoskeletal dynamics and mechanosensing. Finally, we show that specific activation of either MRTFs or TCFs can reset the circadian clock.
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Affiliation(s)
| | | | | | - Phil East
- Bioinformatics and Biostatistics Group
| | | | - Nik Matthews
- Advanced Sequencing Facility, Cancer Research UK London Research Institute, London WC2A 3LY, United Kingdom
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23
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Gerber A, Esnault C, Aubert G, Treisman R, Pralong F, Schibler U. Blood-borne circadian signal stimulates daily oscillations in actin dynamics and SRF activity. Cell 2013; 152:492-503. [PMID: 23374345 DOI: 10.1016/j.cell.2012.12.027] [Citation(s) in RCA: 114] [Impact Index Per Article: 10.4] [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: 05/31/2012] [Revised: 10/08/2012] [Accepted: 12/06/2012] [Indexed: 12/14/2022]
Abstract
In peripheral tissues circadian gene expression can be driven either by local oscillators or by cyclic systemic cues controlled by the master clock in the brain's suprachiasmatic nucleus. In the latter case, systemic signals can activate immediate early transcription factors (IETFs) and thereby control rhythmic transcription. In order to identify IETFs induced by diurnal blood-borne signals, we developed an unbiased experimental strategy, dubbed Synthetic TAndem Repeat PROMoter (STAR-PROM) screening. This technique relies on the observation that most transcription factor binding sites exist at a relatively high frequency in random DNA sequences. Using STAR-PROM we identified serum response factor (SRF) as an IETF responding to oscillating signaling proteins present in human and rodent sera. Our data suggest that in mouse liver SRF is regulated via dramatic diurnal changes of actin dynamics, leading to the rhythmic translocation of the SRF coactivator Myocardin-related transcription factor-B (MRTF-B) into the nucleus.
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Affiliation(s)
- Alan Gerber
- Department of Molecular Biology, Sciences III, University of Geneva, and National Centre of Competence in Research Frontiers in Genetics, 1211 Geneva, Switzerland
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24
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Casner A, Alozy E, Brygoo S, Casanova M, Chauvel L, Chevalier JM, Chies T, Combis P, Courchignoux R, Darbon S, Debonnel C, Depierreux S, Duval A, Esnault C, Fuchs JE, Graillot H, Henry O, Huser G, Jadaud JP, Labaune C, Geille A, Gourrierec PL, Loiseau P, Lutz O, Meyer C, Michel DT, Miquel JL, Naudy M, Nicolaï P, Raffestin D, Renaudin P, Reverdin C, Romary PH, Rousseaux C, Thiell G, Tikhonchuk V, Ulmer JL, Villette B, Videau L, Wröbel R. Update on recent results of LIL experiments. ACTA ACUST UNITED AC 2010. [DOI: 10.1088/1742-6596/244/3/032042] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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25
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Kengne-Momo RP, Jeyachandran YL, Assaf A, Esnault C, Daniel P, Pilard JF, Durand MJ, Lagarde F, Dongo E, Thouand G. A simple method of surface functionalisation for immuno-specific immobilisation of proteins. Anal Bioanal Chem 2010; 398:1249-55. [PMID: 20683585 DOI: 10.1007/s00216-010-4032-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2010] [Revised: 07/07/2010] [Accepted: 07/13/2010] [Indexed: 11/25/2022]
Abstract
We present a new and advanced methodology, developed for surface functionalisation of gold and to study immobilisation of an immuno-specific system of proteins. A combination of electrochemical quartz crystal microbalance and Raman spectroscopy techniques allowed a complete understanding of the system starting from surface functionalisation and progressing to the functional structure analysis of immobilised proteins. A simple electrochemical procedure was formulated to prepare sulphonyl chloride terminated gold surfaces that form a strong sulphonamide bond with the receptor protein staphylococcal protein A (SpA). On the SpA grafted surfaces, the immobilisation of a human IgG and consecutive binding of an immuno-specific anti-human IgG was observed. The surface functional groups form a strong interaction with SpA without disturbing its functional properties. The native functional structure of SpA and also the IgGs was found to be retained in their immobilised state.
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Affiliation(s)
- R P Kengne-Momo
- Laboratoire PEC, UMR CNRS 6087, Université du Maine, A.O. Messiaen, 72085, Le Mans, France
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26
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Esnault C, Ghavi-Helm Y, Brun S, Soutourina J, Van Berkum N, Boschiero C, Holstege F, Werner M. Mediator-dependent recruitment of TFIIH modules in preinitiation complex. Mol Cell 2008; 31:337-46. [PMID: 18691966 DOI: 10.1016/j.molcel.2008.06.021] [Citation(s) in RCA: 120] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2007] [Revised: 02/10/2008] [Accepted: 06/01/2008] [Indexed: 11/18/2022]
Abstract
In vitro, without Mediator, the association of general transcription factors (GTF) and RNA polymerase II (Pol II) in preinitiation complexes (PIC) occurs in an orderly fashion. In this work, we explore the in vivo function of Mediator in GTF recruitment to PIC. A direct interaction between Med11 Mediator head subunit and Rad3 TFIIH subunit was identified. We explored the significance of this interaction and those of Med11 with head module subunits Med17 and Med22 and found that impairing these interactions could differentially affect the recruitment of TFIIH, TFIIE, and Pol II in the PIC. A med11 mutation that altered promoter occupancy by the TFIIK kinase module of TFIIH genome-wide also reduced Pol II CTD serine 5 phosphorylation. We conclude that the Mediator head module plays a critical role in TFIIH and TFIIE recruitment to the PIC. We identify steps in PIC formation that suggest a branched assembly pathway.
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27
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Guglielmi B, Soutourina J, Esnault C, Werner M. TFIIS elongation factor and Mediator act in conjunction during transcription initiation in vivo. Proc Natl Acad Sci U S A 2007; 104:16062-7. [PMID: 17901206 PMCID: PMC2042162 DOI: 10.1073/pnas.0704534104] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The transcription initiation and elongation steps of protein-coding genes usually rely on unrelated protein complexes. However, the TFIIS elongation factor is implicated in both processes. We found that, in the absence of the Med31 Mediator subunit, yeast cells required the TFIIS polymerase II (Pol II)-binding domain but not its RNA cleavage stimulatory activity that is associated with its elongation function. We also found that the TFIIS Pol II-interacting domain was needed for the full recruitment of Pol II to several promoters in the absence of Med31. This work demonstrated that, in addition to its thoroughly characterized role in transcription elongation, TFIIS is implicated through its Pol II-binding domain in the formation or stabilization of the transcription initiation complex in vivo.
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Affiliation(s)
- Benjamin Guglielmi
- Commissariat à l'Energie Atomique, Institut de Biologie et Technologies de Saclay, Bâtiment 144, Commissariat à l'Energie Atomique/Saclay, Gif-sur-Yvette Cedex F-91191, France
| | - Julie Soutourina
- Commissariat à l'Energie Atomique, Institut de Biologie et Technologies de Saclay, Bâtiment 144, Commissariat à l'Energie Atomique/Saclay, Gif-sur-Yvette Cedex F-91191, France
| | - Cyril Esnault
- Commissariat à l'Energie Atomique, Institut de Biologie et Technologies de Saclay, Bâtiment 144, Commissariat à l'Energie Atomique/Saclay, Gif-sur-Yvette Cedex F-91191, France
| | - Michel Werner
- Commissariat à l'Energie Atomique, Institut de Biologie et Technologies de Saclay, Bâtiment 144, Commissariat à l'Energie Atomique/Saclay, Gif-sur-Yvette Cedex F-91191, France
- To whom correspondence should be addressed. E-mail:
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Flori L, Kumulungui B, Aucan C, Esnault C, Traoré AS, Fumoux F, Rihet P. Linkage and association between Plasmodium falciparum blood infection levels and chromosome 5q31-q33. Genes Immun 2003; 4:265-8. [PMID: 12761562 DOI: 10.1038/sj.gene.6363960] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
We have previously mapped a locus controlling Plasmodium falciparum blood infection levels (PFBI) to chromosome 5q31-q33. We genotyped 19 microsatellite markers on chromosome 5q31-q33 in a new sample of 44 pedigrees comprising 84 nuclear families and 292 individuals living in a P. falciparum endemic area. Using a nonparametric multipoint variance-component approach (by GENEHUNTER), we evidenced a peak of linkage close to D5S636 (P=0.0069), with a heritability of 0.46. Using a variance-component method for linkage-disequilibrium mapping of quantitative traits (by QTDT) and the Bonferroni correction for multiple testing, we further detected allelic association in the presence of linkage between blood infection levels and D5S487 (P=6 x 10(-5); P(c)=0.0011), which is located on the distal part of the peak. These results confirm the importance of chromosome 5q31-q33 in the genetic control of PFBI levels.
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Affiliation(s)
- L Flori
- Université de la Méditerranée, Marseille, France
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29
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Zhou CZ, Confalonieri F, Medina N, Zivanovic Y, Esnault C, Yang T, Jacquet M, Janin J, Duguet M, Perasso R, Li ZG. Fine organization of Bombyx mori fibroin heavy chain gene. Nucleic Acids Res 2000; 28:2413-9. [PMID: 10871375 PMCID: PMC102737 DOI: 10.1093/nar/28.12.2413] [Citation(s) in RCA: 417] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2000] [Revised: 05/02/2000] [Accepted: 05/02/2000] [Indexed: 11/13/2022] Open
Abstract
The complete sequence of the Bombyx mori fibroin gene has been determined by means of combining a shotgun sequencing strategy with physical map-based sequencing procedures. It consists of two exons (67 and 15 750 bp, respectively) and one intron (971 bp). The fibroin coding sequence presents a spectacular organization, with a highly repetitive and G-rich (approximately 45%) core flanked by non-repetitive 5' and 3' ends. This repetitive core is composed of alternate arrays of 12 repetitive and 11 amorphous domains. The sequences of the amorphous domains are evolutionarily conserved and the repetitive domains differ from each other in length by a variety of tandem repeats of subdomains of approximately 208 bp which are reminiscent of the repetitive nucleosome organization. A typical composition of a subdomain is a cluster of repetitive units, Ua, followed by a cluster of units, Ub, (with a Ua:Ub ratio of 2:1) flanked by conserved boundary elements at the 3' end. Moreover some repeats are also perfectly conserved at the peptide level indicating that the evolutionary pressure is not identical along the sequence. A tentative model for the constitution and evolution of this unusual gene is discussed.
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Affiliation(s)
- C Z Zhou
- Institut de Génétique et Microbiologie and Laboratoire de Biologie Cellulaire 4, Université Paris-Sud et CNRS, 91405 Orsay Cedex, France
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Abstract
Long interspersed elements (LINEs) are endogenous mobile genetic elements that have dispersed and accumulated in the genomes of higher eukaryotes via germline transposition, with up to 100,000 copies in mammalian genomes. In humans, LINEs are the major source of insertional mutagenesis, being involved in both germinal and somatic mutant phenotypes. Here we show that the human LINE retrotransposons, which transpose through the reverse transcription of their own transcript, can also mobilize transcribed DNA not associated with a LINE sequence by a process involving the diversion of the LINE enzymatic machinery by the corresponding mRNA transcripts. This results in the 'retroposition' of the transcribed gene and the formation of new copies that disclose features characteristic of the widespread and naturally occurring processed pseudogenes: loss of intron and promoter, acquisition of a poly(A) 3' end and presence of target-site duplications of varying length. We further show-by introducing deletions within either coding sequence of the human LINE-that both ORFs are necessary for the formation of the processed pseudogenes, and that retroviral-like elements are not able to produce similar structures in the same assay. Our results strengthen the unique versatility of LINEs as genome modellers.
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Affiliation(s)
- C Esnault
- Unité des Rétrovirus Endogènes et Eléments Rétroïdes des Eucaryotes Supérieurs, CNRS UMR 1573, Institut Gustave Roussy, Villejuif Cedex, France
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Abstract
We have determined the structure and organization of a 630-kb extrachromosomal element (amplisome) containing the dihydrofolate reductase-encoding gene (DHFR) in a methotrexate (MTX)-resistant human cell line, HeLa-Bu25-10B3. The size and copy number of amplisomes have previously been found to remain remarkably stable with or without selection. Both linear and open circular 630-kb amplisomes are present in these cells. We have been able to isolate the linear amplisomes after pulsed-field gel electrophoresis (PFGE), and transfect the amplisomes into MTX-sensitive recipient cells by electroporation, thus demonstrating that DNA as large as 630 kb can be transfected into mammalian cells. The NotI restriction site immediately upstream from DHFR on the circular amplisome is devoid of methylation, suggesting that it is transcriptionally active. Restriction mapping by PFGE reveals that there is only one copy of DHFR per amplisome and no repetitive structure is observed. The small size of the amplisomes, their stability and our ability to transfect large DNA molecules provide the necessary ingredients for the development of mammalian cloning vectors for large DNA fragments.
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Affiliation(s)
- C Esnault
- Department of Pharmacology, University of North Carolina at Chapel Hill 27599-7365
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32
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Mignotte B, Larcher JC, Zheng DQ, Esnault C, Coulaud D, Feunteun J. SV40 induced cellular immortalization: phenotypic changes associated with the loss of proliferative capacity in a conditionally immortalized cell line. Oncogene 1990; 5:1529-33. [PMID: 2174526] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Immortalization of rodent embryo fibroblasts by SV40 is dominantly maintained by the large T antigen. The aim of this work is to characterize some of the events associated with the loss of proliferative capacity in a rat cell line, called REtsAF, which is conditionally immortalized by the tsA58 allele of SV40 large T antigen. DNA replication is arrested less than 24 h after the shift to the restrictive temperature (39 degrees C). This arrest occurs without specificity relative to the cell cycle stage, which suggests that a function essential throughout the cell cycle is affected. A two-dimensional SDS polyacrylamide gel electrophoresis analysis of proteins shows that, although the global rate of protein synthesis is only slightly affected at 39 degrees C, the rate of accumulation of specific proteins is either increased or decreased. Finally we present biochemical and electron microscopy data showing that alterations of the mitochondria occur upon shift to 39 degrees C.
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Affiliation(s)
- B Mignotte
- Laboratoire d'Oncologie Moléculaire, Institut Gustave Roussy, Villejuif, France
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Lambert B, Segal-Bendirdjian E, Esnault C, Le Pecq JB, Roques BP, Jones B, Yeung AT. Recognition by the DNA repair system of DNA structural alterations induced by reversible drug-DNA interactions. Anticancer Drug Des 1990; 5:43-53. [PMID: 2180423] [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] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Ditercalinium (NSC 335153) was synthesized as a bifunctional DNA intercalator. It is made of two 7-H pyridocarbazole rings joined by a rigid bis-ethyl bispiperidine chain. It binds to DNA with high affinity and elicits anti-tumor activity on a variety of animal tumors. 1H n.m.r. studies of ditercalinium bis-intercalated into d(CpGpCpG)2 have shown that the intercalation process occurs from the large groove of the DNA helix while the two intercalated rings are separated by two base pairs. Because of the linking chain rigidity of ditercalinium, DNA conformation has to be altered to permit the intercalation of the two rings. DNA must be bent toward the minor groove. In E. coli, ditercalinium elicits a specific toxicity on polA strains which is suppressed by an additional uvrA mutation. In vitro, the purified UvrA and UvrB proteins bind to the DNA-ditercalinium complex in an ATP dependent manner. The UvrABC complex induces single-strand nicks, but only when ditercalinium is bound to negatively supercoiled DNA. The life-time of the UvrAB-DNA-ditercalinium complex is greater than 50 min when free ditercalinium concentration is maintained constant in the incubation medium. The cytotoxicity of ditercalinium in E. coli results from the induction of a futile and abortive DNA repair. The reversible ditercalinium-DNA complex mimics a bulky DNA lesion, yet the UvrABC endonuclease is unable to cope with a reversible lesion since it cannot eliminate the causative agent. The interaction of UvrA and UvrB proteins has also been studied with DNA and other DNA-binding drugs forming high-affinity complexes such as distamycin. The Uvr protein recognition process appears to be associated with specific DNA structural alterations. In eukaryotic cells, ditercalinium is concentrated in mitochondria. Mitochondrial DNA is rapidly and totally degraded. Mitochondrial DNA coded proteins being no longer synthesized, the respiratory chain is progressively inactivated. The stimulation of the glycolytic pathway allows the cells to continue growth for several generations. Dihydro-orotate dehydrogenase is located in the inner membrane of mitochondria and its activity is dependent on mitochondria energization. It becomes inactive after ditercalinium treatment. A drop of the pyrimidine pool is then observed. Complementation of treated cells with uridine decreases 10-fold the ditercalinium toxicity. The cellular delayed toxicity of ditercalinium results from the slow induction of a pyrimidineless state associated with the progressive inactivation of mitochondria. The results show that DNA structural alterations induced by reversible drug-DNA complexes can be recognized by DNA repair enzymes.(ABSTRACT TRUNCATED AT 400 WORDS)
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Affiliation(s)
- B Lambert
- Unité de Physicochimie Macromoléculaire, URA 158 CNRS, U140 INSERM, Institut Gustave Roussy, Villejuif, France
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Esnault C, Brown SC, Segal-Bendirdjian E, Coulaud D, Mishal Z, Roques BP, Le Pecq JB. Selective alteration of mitochondrial function by Ditercalinium (NSC 335153), a DNA bisintercalating agent. Biochem Pharmacol 1990; 39:109-22. [PMID: 2297352 DOI: 10.1016/0006-2952(90)90654-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The bifunctional intercalator Ditercalinium (NSC 335153) demonstrates an anti-tumoral cytotoxicity markedly different from other intercalating agents. A delayed toxicity is observed in eucaryotic cells, both in vitro and in vivo, at drug concentrations far below those required to observe immediate toxic effects. Fluorescence microscopy demonstrates that Ditercalinium and the mitochondrial-staining fluorophore DiOC2(5) are concentrated in the same cellular organelles of L1210 cells. Electron microscopy of Ditercalinium-treated cells reveals extensive and progressive swelling of mitochondria, with no other ultrastructural changes observed. Ditercalinium uptake and toxicity are in part related to mitochondrial membrane potential. However, drug accumulation itself does not immediately alter the mitochondrial membrane potential. Cellular ATP pool levels and the rate of respiration fall progressively after drug treatment. Nucleotide pools in DC3F cells, measured between drug treatment and death, show marked drops in pyrimidine levels while purine nucleotide levels decline more slowly. Addition of uridine or cytidine partially rescues Ditercalinium-treated cells, while toxicity is increased in the presence of 2-deoxyglucose. The combined evidence indicates that the toxicity of Ditercalinium to murine leukemia cells (L1210) and Chinese Hamster lung cells (DC3F) is due to disruption of mitochondrial function.
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Affiliation(s)
- C Esnault
- Unite de Physiocochimie Macromoleculaire (CNRS UA158, INSERM U140) Institut Gustave Roussy, Villejuif, France
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35
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Markovits J, Pommier Y, Mattern MR, Esnault C, Roques BP, Le Pecq JB, Kohn KW. Effects of the bifunctional antitumor intercalator ditercalinium on DNA in mouse leukemia L1210 cells and DNA topoisomerase II. Cancer Res 1986; 46:5821-6. [PMID: 3019538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Ditercalinium, a 7H-pyridocarbazole dimer (bisintercalator) belongs to a new class of antineoplastic intercalating agents. To investigate its mechanism of cytotoxicity, the effects of ditercalinium on DNA were assessed using normal (L1210) and drug-resistant (L1210/PyDi1) mouse leukemia cells. Alkaline elution assays demonstrated that ditercalinium produced no DNA strand breaks, DNA-protein cross-links, or DNA-DNA cross-links, eliminating these effects as cytotoxic lesions. This result sets ditercalinium apart from other intercalating agents with respect to its interaction with DNA. Nucleoids (histone-depleted chromatin) from ditercalinium-treated L1210 cells were considerably more compact than those from untreated cells, as determined by sedimentation in neutral sucrose gradients. In contrast, nucleoids from ditercalinium-treated L1210/PyDi1 (resistant) cells were similar in compactness to those from control cells. Thus, ditercalinium altered chromatin structure in vivo. The effect of the bisintercalator on purified DNA topoisomerase II, an intracellular target of monointercalators, was measured in vitro. Ditercalinium (5 X 10(-7) M) completely inhibited both the formation of covalent complexes between this enzyme and simian virus 40 DNA and the enzyme-induced DNA cleavage. In addition, ditercalinium induced DNA catenation in the presence of topoisomerase II and adenosine triphosphate. Thus, the cytotoxicity of ditercalinium may derive from a mechanism that, although involving topoisomerase II, is manifested by condensation of DNA rather than by the induction of protein-associated DNA strand breaks.
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Esnault C, Roques BP, Jacquemin-Sablon A, Le Pecq JB. Effects of new antitumor bifunctional intercalators derived from 7H-pyridocarbazole on sensitive and resistant L 1210 cells. Cancer Res 1984; 44:4355-60. [PMID: 6467197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The antitumor properties of 7H-pyridocarbazole dimers, a new series of bifunctional intercalators, have recently been described (Pelaprat, D. Delbarre, A., Le Guen, I., Roques, B. P., and Le Pecq, J. B. J. Med. Chem., 23: 1336-1343, 1980; and Roques, B. P., Pelaprat, D., Le Guen, I., Porcher, G., Gosse, C., and Le Pecq, J. B. Biochem. Pharmacol., 28: 1811-1815, 1979). In order to study the mechanism of action of these compounds, an L1210 subline was made resistant to one dimer (NSC 335153; ditercalinium). Selection of resistant cells was based on an in vitro-in vivo procedure as follows. Ascitic cells were taken from a leukemic mouse and incubated in vitro with the dimer for 1 hr. They were then injected into mice. After the development of the ascites, L1210 cells were collected and the process was repeated 13 times, until establishment of the resistance. Cloned resistant cells have maintained their resistance for 18 months of in vitro culture. The effects of two dimers (NSC 335153 and NSC 335154) on cell viability, growth, colony formation, and cell cycle progression were investigated on parental and resistant L1210 cells. The cross-resistance of these two L1210 cell lines to several cytotoxic agents was estimated. Several observations indicate that the mechanism of action of these dimers might be different from that of monointercalating agents: (a) these drugs induce a delayed toxicity (growth arrest occurring five generations after drug exposure) in sensitive but not in resistant cells; (b) cells exposed to the dimers arrested almost randomly in all phases of the cell cycle, whereas the corresponding monomer provokes a block in the G2 + M phase. Resistant cells were cross-resistant to 7H-pyridocarbazole monomer, Adriamycin, and vincristine but not to 6H-pyridocarbazole monomer derivatives, actinomycin D, and methotrexate.
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Beloeil JC, Esnault C, Fétizon M, Henry R. Synthesis and pyrogenic effect of 3 alpha, 7 alpha-dihydroxy-5 beta-androstan-17-one and 3 alpha-hydroxy-5 beta-androstane-7, 17-dione. Steroids 1980; 35:281-93. [PMID: 7376222 DOI: 10.1016/0039-128x(80)90041-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
The first chemical synthesis of 3 alpha, 7 alpha-dihydroxy-5 beta-androstan-17-one and 3 alpha-hydroxy-5 beta-androstane-7, 17-dione is reported. In this method, the 17 beta-side chain of commercial chenodesoxycholic acid was degraded in 6 steps after selective protection of the hydroxyl groups: 3 alpha-OH by a tert-butyldimethylsilyl group and 7 alpha-OH by an acetoxy group. The capacity of 3 alpha, 7 alpha-dihydroxy-5 beta-androstan-17-one and 3 alpha-hydroxy-5 beta-androstane-7, 17-dione to release a pyrogen by human leukocytes was investigated by two independent methods: supernatants from leukocytes incubated with a steroid are injected to rabbits whose fever is measured, or tested by the Limulus Test (a pyrogen detection technique). The 7-keto substituted etiocholanolone still possessed pyrogenic activity, while the 7 alpha-hydroxyl substituted one did not.
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Clarke JR, Esnault C, Nicolle JC. Feulgen-DNA changes in the germ cells of the male vole (Microtus agrestis) during their development. Reprod Nutr Dev (1980) 1980; 20:183-90. [PMID: 6760273 DOI: 10.1051/rnd:19800112] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Consistent with changes in ploidy during germ cell maturation, the quantity of Feulgen DNA in round spermatids of voles is approximately a quarter of that in primary spermatocytes. The amount increases slightly in elongated spermatids, and then declines in spermatozoa from the testis, epididymis and vas deferens, below the level of round spermatids. Simultaneously nuclear area decreases so that in spermatozoa it is about one tenth that of primary spermatocytes. The rise in Feulgen DNA in elongated spermatids above the level found in round spermatids, and the decline in spermatozoa below this level, is probably caused by altered affinity of the desoxyribose for the leucofuchsin. This may be brought about by the complex physico-chemical changes occurring in chromatin and elsewhere in the nucleus and cell as they acquire their highly specialised final form.
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Amir D, Esnault C, Nicolle JC, Courot M. DNA and protein changes in the spermatozoa of bulls treated orally with ethylene dibromide. J Reprod Fertil 1977; 51:453-6. [PMID: 338893 DOI: 10.1530/jrf.0.0510453] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Oral treatment of bulls with ethylene dibromide caused a temporary reduction of the DNA and protein content and head area of epididymal and ejaculated spermatozoa.
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Amir D, Esnault C, Nicolle JC, Courot M. DNA and protein changes in the spermatozoa of bulls treated orally with ethlene dibromide. Reproduction 1977. [DOI: 10.1530/jrf.0.0510451] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Dupont H, Esnault C, Duluc AJ, Mayer G. [Relative concentration of deoxyribonucleic acid in the experimental deciduoma and the blastocyst of female rats: cytophotometric study]. Bull Assoc Anat (Nancy) 1975; 59:621-30. [PMID: 1222306] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Polyploidy level of experimentally induced deciduomata was determined by cytophotometric measures of DNA-Feulgen, with the "Ultramikrospektrophotometer UMSP Zeiss" by scanning. The antimesometrial tissue reached 32 n, 72 H after the uterine trauma, whereas the mesometrial part did not exceed a 4 n polyploidy level. With the same technics we studied the ovarian hormone, its action upon the blastocyst cellular cycle. In delayed blastocysts, synthesis was never found. OEstradiol removed the inhibition and DNA synthesis then starts again.
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Dupont H, Esnault C, Duluc AJ, Mayer G. [Development of polyploidy in experimental deciduoma in the female rat in unilateral pregnancy: cytophotometric study]. C R Acad Hebd Seances Acad Sci D 1974; 279:501-4. [PMID: 4216420] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Bouters R, Esnault C, Salisbury GW, Ortavant R. Discrepancies in analyses of deoxyribonucleic acid in rabbit spermatozoa, involving Feulgen staining (Feulgen-DNA) and ultraviolet light absorption (UV-DNA) measurements. J Reprod Fertil 1967; 14:355-63. [PMID: 4169245 DOI: 10.1530/jrf.0.0140355] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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