Mécanismes de régulation des gènes par les facteurs de transcription
Nous explorons les mécanismes de régulation de la transcription qui régissent la régulation du génome à l'interface des facteurs de transcription, des protéines de la chromatine et de la machinerie de transcription, en encadrant les résultats dans les processus de développement.
La régulation des gènes est au cœur du destin cellulaire et dépend fortement de l’activité des facteurs de transcription. On sait peu de choses sur la façon dont les complexes de régulation de la transcription s’assemblent, comment ils négocient la chromatine et ce qui sous-tend leur spécificité fonctionnelle et leur diversité. Nos projets visent à explorer les mécanismes de régulation de la transcription pour, à terme, mieux comprendre la régulation du génome. Nous nous concentrons sur les facteurs de transcription Hox, une famille de facteurs de transcription à homéodomaine ayant des fonctions clés dans le développement, l’évolution et les processus physio-pathologiques.
Les travaux de l’équipe ont contribué à clarifier le paradoxe de la spécificité de Hox, en identifiant les séquences protéiques intrinsèques de Hox responsables de la spécificité, et en découvrant de nouveaux modes d’interactions avec les cofacteurs de spécificité de la classe PBC. Nous avons également identifié des liens physiques et fonctionnels avec les protéines de la chromatine, notamment les protéines du complexe PcG et Mediator, ainsi que des liens avec le facteur de pause de la transcription M1BP, reliant l’activité des protéines Hox à la modification de la chromatine et à l’activité de la machinerie basale de transcription.
Plus récemment, nous avons découvert une nouvelle facette de la fonction des protéines Hox, où les protéines Hox agissent de manière non spécifique aux paralogues, une propriété qui correspond mieux aux propriétés biochimiques Hox partagées. Nos directions de recherche actuelles visent à étudier au niveau physiologique comment les fonctions spécifiques et non spécifiques de Hox sont liées les unes aux autres, en explorant les fonctions des protéines Hox dans deux tissus, le corps gras larvaire et le développement musculaire adulte. Les travaux visent également à découvrir les principes moléculaires des fonctions génériques de Hox, qui n’ont jusqu’à présent pas été étudiés.
Publications
M1BP is an essential transcriptional activator of oxidative metabolism during Drosophila development
Hox Proteins in the Regulation of Muscle Development
HoxB genes regulate neuronal delamination in the trunk neural tube by controlling the expression of Lzts1
The Generic Facet of Hox Protein Function
Hox functional diversity: Novel insights from flexible motif folding and plastic protein interaction
Hox proteins mediate developmental and environmental control of autophagy
M1BP is an essential transcriptional activator of oxidative metabolism during Drosophila development
Hox Proteins in the Regulation of Muscle Development
HoxB genes regulate neuronal delamination in the trunk neural tube by controlling the expression of Lzts1
Human ZKSCAN3 and Drosophila M1BP are functionally homologous transcription factors in autophagy regulation
Cooperation of axial and sex specific information controls Drosophila female genitalia growth by regulating the Decapentaplegic pathway
PLZF limits enhancer activity during hematopoietic progenitor aging
The Generic Facet of Hox Protein Function
Fattening the perspective of Hox protein specificity through SLiMming
Post-translational modifications of HOX proteins, an underestimated issue
Regulation of the positive transcriptional effect of PLZF through a non-canonical EZH2 activity
The Hox proteins Ubx and AbdA collaborate with the transcription pausing factor M1BP to regulate gene transcription
Hox functional diversity: Novel insights from flexible motif folding and plastic protein interaction
Hox Service Warranty Extends to Adult Bone Repair.
Guidelines for the use and interpretation of assays for monitoring autophagy (3rd edition).
A survey of conservation of sea spider and Drosophila Hox protein activities.
Cellular and molecular insights into Hox protein action.
A flexible extension of the Drosophila ultrabithorax homeodomain defines a novel Hox/PBC interaction mode.
Autophagy : Moving Benchside Promises to Patient Bedsides.
Plasticity versus specificity in RTK signalling modalities for distinct biological outcomes in motor neurons
Drosophila Hox transcription factors access the RNA Polymerase II machinery through direct homeodomain binding to a conserved motif of Mediator subunit Med19
Hox genes : a fertile interplay of concepts and methods.
Hox proteins mediate developmental and environmental control of autophagy
TAFA4, a Chemokine-like Protein, Modulates Injury-Induced Mechanical and Chemical Pain Hypersensitivity in Mice.
Distinct genetic requirements for BX-C mediated specification of abdominal denticles.
Deregulation of the Protocadherin Gene FAT1 Alters Muscle Shapes: Implications for the Pathogenesis of Facioscapulohumeral Dystrophy.
The emerging role of acetylation in the regulation of autophagy.
Antagonism Versus Cooperativity with TALE Cofactors at the Base of the Functional Diversification of Hox Protein Function.
Distinct molecular strategies for Hox-mediated limb suppression in Drosophila: from cooperativity to dispensability/antagonism in TALE partnership.
The MYST-containing protein Chameau is required for proper sensory organ specification during Drosophila thorax morphogenesis.
Hox proteins display a common and ancestral ability to diversify their interaction mode with the PBC class cofactors.
Insights into Hox protein function from a large scale combinatorial analysis of protein domains.
Characterisation of genome-wide PLZF/RARA target genes.
Pool-specific regulation of motor neuron survival by neurotrophic support.
Stable, conditional, and muscle-fiber-specific expression of electroporated transgenes in chick limb muscle cells
Selection of distinct Hox-Extradenticle interaction modes fine-tunes Hox protein activity.
Visualization of protein interactions in living Drosophila embryos by the bimolecular fluorescence complementation assay.
Control of DNA replication: a new facet of Hox proteins?
Reiterative use of signalling pathways controls multiple cellular events during Drosophila posterior spiracle organogenesis.
Regulation of Hox activity: insights from protein motifs.
The timing of emergence of muscle progenitors is controlled by an FGF/ERK/SNAIL1 pathway
The PRC1 Polycomb group complex interacts with PLZF/RARA to mediate leukemic transformation
Classification of sequence signatures: a guide to Hox protein function.
Telomeric trans-silencing in Drosophila melanogaster: tissue specificity, development and functional interactions between non-homologous telomeres
Reptin and Pontin function antagonistically with PcG and TrxG complexes to mediate Hox gene control.
A unique Extradenticle recruitment mode in the Drosophila Hox protein Ultrabithorax.
A molecular clock operates during chick autopod proximal-distal outgrowth
Liprin-alpha has LAR-independent functions in R7 photoreceptor axon targeting.
Chameau HAT and DRpd3 HDAC function as antagonistic cofactors of JNK/AP-1-dependent transcription during Drosophila metamorphosis.
Getting a molecular grasp on Hox contextual activity.
Control of the segmentation process by graded MAPK/ERK activation in the chick embryo
Hox-controlled reorganisation of intrasegmental patterning cues underlies Drosophila posterior spiracle organogenesis.
Ectopic Myf5 or MyoD prevents the neuronal differentiation program in addition to inducing skeletal muscle differentiation, in the chick neural tube
Tgfbeta signaling acts on a Hox response element to confer specificity and diversity to Hox protein function.
The hexapeptide and linker regions of the AbdA Hox protein regulate its activating and repressive functions.
Hox genes and apoptosis, from architecture to sculpture.
Reptin and pontin antagonistically regulate heart growth in zebrafish embryos.
A green fluorescent protein reporter genetic screen that identifies modifiers of Hox gene function in the Drosophila embryo.
The MYST domain acetyltransferase Chameau functions in epigenetic mechanisms of transcriptional repression.
Direct imaging of human SWI/SNF-remodeled mono- and polynucleosomes by atomic force microscopy employing carbon nanotube tips
Cell-autonomous and -nonautonomous functions of LAR in R7 photoreceptor axon targeting.
Reconstitution of a functional core polycomb repressive complex.
A Drosophila Polycomb group complex includes Zeste and dTAFII proteins
DWnt4 and wingless elicit similar cellular responses during imaginal development.
Purification and characterization of mSin3A-containing Brg1 and hBrm chromatin remodeling complexes.
Notch signalling acts in postmitotic avian myogenic cells to control MyoD activation
Delta 1-activated notch inhibits muscle differentiation without affecting Myf5 and Pax3 expression in chick limb myogenesis
HPC3 is a new human polycomb orthologue that interacts and associates with RING1 and Bmi1 and has transcriptional repression properties
Paraxis is expressed in myoblasts during their migration and proliferation in the chick limb bud
dlarp, a new candidate Hox target in Drosophila whose orthologue in mouse is expressed at sites of epithelium/mesenchymal interactions
The Ste20 kinase misshapen regulates both photoreceptor axon targeting and dorsal closure, acting downstream of distinct signals
Dynamic expression of d-CdGAPr, a novel Drosophila melanogaster gene encoding a GTPase activating protein.
Distinct hox protein sequences determine specificity in different tissues.
pannier acts upstream of wingless to direct dorsal eye disc development in Drosophila
nessy, an evolutionary conserved gene controlled by Hox proteins during Drosophila embryogenesis
Antagonist activity of DWnt-4 and wingless in the Drosophila embryonic ventral ectoderm and in heterologous Xenopus assays.
SSX and the synovial-sarcoma-specific chimaeric protein SYT-SSX co-localize with the human Polycomb group complex.
Identification of the t(15;17) in AML FAB types other than M3: evaluation of the role of molecular screening for the PML/RARalpha rearrangement in newly diagnosed AML. The Medical Research Council (MRC) Adult Leukaemia Working Party
SUMO-1 modification of the acute promyelocytic leukaemia protein PML: implications for nuclear localisation
The human polycomb group complex associates with pericentromeric heterochromatin to form a novel nuclear domain
Wnt and TGFbeta signals subdivide the AbdA Hox domain during Drosophila mesoderm patterning.
RING1 is associated with the polycomb group protein complex and acts as a transcriptional repressor.
Drosophila Hox complex downstream targets and the function of homeotic genes.
Hox genes in evolution: protein surfaces and paralog groups.
The Drosophila teashirt homeotic protein is a DNA-binding protein and modulo, a HOM-C regulated modifier of variegation, is a likely candidate for being a direct target gene.
Inhibition of mitogen-induced DNA synthesis by bafilomycin A1 in Swiss 3T3 fibroblasts
wingless and DWnt4, 2 Drosophila Wnt genes, have related expression, regulation and function during the embryonic development.
Genetic and molecular analysis of terminal deletions of chromosome 3R of Drosophila melanogaster.
DWnt-4, a novel Drosophila Wnt gene acts downstream of homeotic complex genes in the visceral mesoderm.
The modifier of variegation modulo gene acts downstream of dorsoventral and HOM-C genes and is required for morphogenesis in Drosophila.
A quick method for immunoscreening recombinant bacterial colonies.
Cell lineage-specific expression of modulo, a dose-dependent modifier of variegation in Drosophila.
Homeotic control in Drosophila; the scabrous gene is an in vivo target of Ultrabithorax proteins.
Actualités
Réalisations et promotions récentes
Fais ton stage à l’IBDM !
Tu es à la recherche de ton stage de Master ? L’IBDM te semble être le bon endroit pour le faire ? Découvre nos offres dès maintenant.
En utilisant le muscle de vol de la drosophile, le groupe de Saurin et Graba identifie le facteur de transcription M1BP comme un nouveau régulateur majeur du métabolisme oxydatif mitochondrial.
Identification d’une fonction générique des protéines Hox dans le tube neural chez les vertébrés
L’équipe de Yacine Graba et Andrew Saurin vient d’identifier une fonction atypique des gènes HoxB au cours du développement de la moelle épinière.
How two recently discovered and oppositely acting transcriptional regulators control metabolism in the Drosophila larval fat body, with a special attention on metabolic paths linked to fat accumulation.
Les travaux porteront sur la manière dont les séquences de protéines de facteurs de transcription influencent la séparation de phase liquide-liquide (LLPS), la sous-compartimentation nucléaire et la régulation des gènes au cours du développement.
The project aims at uncovering the molecular and cellular bases for Ubx and AbdA distinct motif usage.
The M2 project will use state-of-the-art genomics profiling techniques, Drosophila genetics, imaging and molecular biology for studying the antagonistic transcriptional control and dysfunction of fat body lipid metabolism development.
The M2 project will use state-of-the-art genomics profiling techniques, Drosophila genetics, imaging and molecular biology for studying muscle development.