Research
Our research team develops and uses in vitro models that replicate the normal and pathological development of the human and murine spinal cord to explore the fundamental mechanisms governing its formation. We focus our efforts on the modes of action of signaling pathways involving FGFs, TGFβs, and BMPs, as well as the role of the HOX and PAX transcription factors.
Our work also aims to improve the understanding of associated pathologies, including infantile spinal muscular atrophy, rhabdomyosarcoma, spina bifida, and amyotrophic lateral sclerosis.
Axis 1: PAX3/7 and BMPs – Spatial Regulation of Cell Fates and Morphologies
The paralogous transcription factors PAX3 and PAX7 can function both as transcriptional activators and repressors. This functional duality is modulated along the dorsoventral axis of the embryonic spinal cord by the BMP signaling gradient, with each function determining specific cell fates and morphologies. We aim to decipher how this dual activity is integrated at the genomic level by analyzing the recruitment of PAX proteins and their partners, as well as the associated chromatin dynamics. In parallel, we are investigating how the gene networks regulated by PAX orchestrate their effects on cell fate, morphology, and the mechanical properties of the neuroepithelium. This research seeks to provide insights into how mutations affecting PAX or their regulatory networks lead to defects in neural tube closure and neurogenesis, underlying a major congenital condition: spina bifida.

Axis 2: Signaling Dynamics and Specification of Neuronal Diversity
We have demonstrated that FGF and TGFβ signaling pathways orchestrate the induction of HOX genes within their genomic clusters in human spinal progenitors. We are investigating whether these mechanisms involve temporal dynamics in signaling pathway activity. Additionally, we are evaluating the functional significance of these dynamics in generating cellular diversity, which underlies the formation of locomotor circuits.
To achieve this, we are using innovative organoid models in which HOX genes are sequentially induced in progenitors generating a neural tube. This tube exhibits HOX gene expression patterns organized into bands along the elongation axis, mimicking the organization observed in the embryonic spinal cord.
Axis 3: Cellular and Molecular Basis of Motor Neuron Disease
These in vitro models provide access to human tissues or cell types affected in various diseases. We use patient-derived induced pluripotent stem cells and in vitro embryogenesis models to study the foundations of motor neuron diseases—an heterogeneous group of incurable and often fatal disorders. Our focus is on infantile spinal muscular atrophies (SMAs), which, although caused by mutations in ubiquitously expressed genes, are associated with defects in the formation or survival of specific motor neuron populations, while others remain unaffected. Deciphering the basis of vulnerability or resilience in these distinct motor neuron subtypes could pave the way for novel therapeutic strategies. Building on these approaches, we are initiating a project on amyotrophic lateral sclerosis (ALS) in collaboration with Odil Porrua.
Axis 4: Hijacking Neurodevelopmental Signals in Rhabdomyosarcoma
The ectopic activation of developmental signaling pathways in pediatric cancers, including rhabdomyosarcoma, may explain their rapid progression without the accumulation of typical proto-oncogenic aberrations. In this project, we assess the potential of neuronal cells to give rise to neoplasms resembling rhabdomyosarcoma. In collaboration with M. Castets (CRCL) and E. Pasquier (CRCM), we investigate the role of neurodevelopmental signals in the emergence of this cancer and explore the possibility of targeting these signals to sensitize rhabdomyosarcoma cells to existing chemotherapy treatments.

Members
Team leaders
Stephane NEDELEC,
Chercheur,
RIBES/NEDELEC LAB+33 (0)1 57 27 81 93, room 555B
Vanessa RIBES,
Chercheur,
RIBES/NEDELEC LAB+33 (0)1 57 27 81 93, room 555B
Members
Kenza CHERIET,
Doctorante,
RIBES/NEDELEC LAB+33 (0)1 57 27 81 93, room 555B
Claire DUGAST,
Chercheur,
RIBES/NEDELEC LAB+33 (0)1 57 27 81 93, room 555B
Pascale GILARDI HEBENSTREIT,
Chercheur,
RIBES/NEDELEC LAB+33 (0)1 57 27 81 93, room 555B
Marine GRISON,
Ingénieure en biologie,
RIBES/NEDELEC LAB+33 (0)1 57 27 81 93, room 555B
Grace HENSTONE,
Doctorante,
RIBES/NEDELEC LAB+33 (0)1 57 27 81 93, room 555B
Theaud HEZEZ,
Doctorant,
RIBES/NEDELEC LAB+33 (0)1 57 27 81 93, room 555B
Helena MALEK,
Doctorante,
RIBES/NEDELEC LAB+33 (0)1 57 27 81 93, room 555B
Camil MIRDASS,
Doctorant,
RIBES/NEDELEC LAB+33 (0)1 57 27 81 93, room 555B
Robin RONDON,
Doctorant,
RIBES/NEDELEC LAB+33 (0)1 57 27 81 93, room 555B
To contact a member of the team by e-mail: name.surname@ijm.fr

Selected publication
Stem cell-derived models of spinal neurulation. Mirdass C, Catala M, Bocel M, Nedelec S, Ribes V. Emerg Top Life Sci. 2023 Dec 18;7(4):423-437. doi: 10.1042/ETLS20230087. PMID: 38087891 Review.
Self-organizing models of human trunk organogenesis recapitulate spinal cord and spine co-morphogenesis. Gribaudo S, Robert R, van Sambeek B, Mirdass C, Lyubimova A, Bouhali K, Ferent J, Morin X, van Oudenaarden A, Nedelec S. Nat Biotechnol. 2024 Aug;42(8):1243-1253. doi: 10.1038/s41587-023-01956-9. Epub 2023 Sep 14. PMID: 37709912
Single-cell transcriptomic analysis reveals diversity within mammalian spinal motor neurons. Liau ES, Jin S, Chen YC, Liu WS, Calon M, Nedelec S, Nie Q, Chen JA. Nat Commun. 2023 Jan 3;14(1):46. doi: 10.1038/s41467-022-35574-x. PMID: 36596814 Free PMC article.
Dynamic extrinsic pacing of the HOX clock in human axial progenitors controls motor neuron subtype specification. Mouilleau V, Vaslin C, Robert R, Gribaudo S, Nicolas N, Jarrige M, Terray A, Lesueur L, Mathis MW, Croft G, Daynac M, Rouiller-Fabre V, Wichterle H, Ribes V, Martinat C, Nedelec S. Development. 2021 Mar 29;148(6):dev194514. doi: 10.1242/dev.194514.
The PAX-FOXO1s trigger fast trans-differentiation of chick embryonic neural cells into alveolar rhabdomyosarcoma with tissue invasive properties limited by S phase entry inhibition. Gonzalez Curto G, Der Vartanian A, Frarma YE, Manceau L, Baldi L, Prisco S, Elarouci N, Causeret F, Korenkov D, Rigolet M, Aurade F, De Reynies A, Contremoulins V, Relaix F, Faklaris O, Briscoe J, Gilardi-Hebenstreit P, Ribes V. PLoS Genet. 2020 Nov 11;16(11):e1009164. doi: 10.1371/journal.pgen.1009164.
In vitro models of spinal motor circuit’s development in mammals: achievements and challenges. Nedelec S, Martinez-Arias A. Curr Opin Neurobiol. 2021 Feb;66:240-249. doi: 10.1016/j.conb.2020.12.002. Epub 2021 Mar 5. PMID: 33677159 Review.
Dullard-mediated Smad1/5/8 inhibition controls mouse cardiac neural crest cells condensation and outflow tract septation. Darrigrand JF, Valente M, Comai G, Martinez P, Petit M, Nishinakamura R, Osorio DS, Renault G, Marchiol C, Ribes V, Cadot B. Elife. 2020 Feb 27;9:e50325. doi: 10.7554/eLife.50325.
BMP4 patterns Smad activity and generates stereotyped cell fate organization in spinal organoids. Duval N, Vaslin C, Barata TC, Frarma Y, Contremoulins V, Baudin X, Nedelec S, Ribes VC. Development. 2019 Jul 25;146(14):dev175430. doi: 10.1242/dev.175430.
Pax3- and Pax7-mediated Dbx1 regulation orchestrates the patterning of intermediate spinal interneurons. Gard C, Gonzalez Curto G, Frarma YE, Chollet E, Duval N, Auzié V, Auradé F, Vigier L, Relaix F, Pierani A, Causeret F, Ribes V. Dev Biol. 2017 Dec 1;432(1):24-33. doi: 10.1016/j.ydbio.2017.06.014.
Combinatorial analysis of developmental cues efficiently converts human pluripotent stem cells into multiple neuronal subtypes. Maury Y, Côme J, Piskorowski RA, Salah-Mohellibi N, Chevaleyre V, Peschanski M, Martinat C, Nedelec S. Nat Biotechnol. 2015 Jan;33(1):89-96. doi: 10.1038/nbt.3049. Epub 2014 Nov 10. PMID: 25383599
All publications since 2017
Publications
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tional%20studies.%20Here%20we%20describe%20a%20scalable%2C%20automated%20approach%20to%20systematically%20test%20the%20combinatorial%20actions%20of%20small%20molecules%20for%20the%20targeted%20differentiation%20of%20hPSCs.%20Applied%20to%20the%20generation%20of%20neuronal%20subtypes%2C%20this%20analysis%20revealed%20an%20unappreciated%20role%20for%20canonical%20Wnt%20signaling%20in%20specifying%20motor%20neuron%20diversity%20from%20hPSCs%20and%20allowed%20us%20to%20define%20rapid%20%2814%20days%29%2C%20efficient%20procedures%20to%20generate%20spinal%20and%20cranial%20motor%20neurons%20as%20well%20as%20spinal%20interneurons%20and%20sensory%20neurons.%20Our%20systematic%20approach%20to%20improving%20hPSC-targeted%20differentiation%20should%20facilitate%20disease%20modeling%20studies%20and%20drug%20screening%20assays.%22%2C%22date%22%3A%222015-01%22%2C%22language%22%3A%22eng%22%2C%22DOI%22%3A%2210.1038%5C%2Fnbt.3049%22%2C%22ISSN%22%3A%221546-1696%22%2C%22url%22%3A%22%22%2C%22collections%22%3A%5B%22MIYUW3RH%22%5D%2C%22dateModified%22%3A%222025-02-11T10%3A55%3A47Z%22%7D%7D%5D%7D
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Theses
- Maeliss Calon: “Study of the Molecular and Cellular Bases of Motor Neuron Vulnerability in Distal Spinal Muscular Atrophy of the Lower Limbs”, defended on September 26, 2024.
- Rémi Robert: “Study of the Mechanisms Controlling HOX Gene Expression and Implications for the In Vitro Generation of Human Tissues”, defended on September 22, 2023.
- Line Manceau: “Study of the Molecular and Cellular Mechanisms Through Which the Paralogous Transcription Factors PAX3-FOXO1 and PAX7-FOXO1 Exert Their Oncogenic Activity”, defended on September 24, 2021.
- Célia Vaslin: “Study of the Cellular Signaling Mechanisms Controlling Neuronal Diversification in the Spinal Cord”, defended on March 26, 2021.
- Vincent Mouilleau: “Study of the Mechanisms of Human Spinal Cord Development Through the Establishment of In Vitro Models Derived from Human Pluripotent Stem Cells”, defended on November 26, 2019.
Collaborations
- Nicolas Borghi (IJM)
- Valérie Doye (IJM)
- Alexandre Baffet (Institut Curie, France)
- Nadia Bahi-Buisson (Institut Imagine, France)
- Bertrand Bénazéraf (Centre de Biologie Intégrative, CBI, France)
- Jésus Lacal (University of Salamanca, Spain)
- Marie Castets (Centre de Recherche en Cancérologie de Lyon, CRCL, Lyon)
- Valérie Dupé (Institut Génétique & Développement de Rennes, IGDR, Rennes)
- Fiona Francis (Institut du Fer à Moulin, IFM, France)
- Eddy Pasquier (Centre de Recherche en Cancérologie de Marseille, CRCM, Marseille)
- Alessandra Pierani (Institut Imagine, France)
- Benoit Sorre (Institut Curie, France)
Grants - funding
- INSERM
- Ligue Nationale Contre le Cancer
- Agence Nationale de la Recherche
- AFM – Téléthon
- Fondation pour la Recherche Médicale
- L’association WonderAugustine
- Financement “Emergence en recherche” (Université Paris Cité)
News
Job
Post-doctoral positions
We are looking for postdoctoral candidates interested in working on transcriptional regulation of cell fate decisions, with expertise in iPSC culture or bioinformatics. Applicants should email to stephane.nedelec@ijm.fr with their CV, motivation letter and contact details for 2-3 referees.
Master students
We are currently looking for a Master 2 student, with interest in regulation of chromatin states during neural development (stephane.nedelec@ijm.fr) or cancer emergence (vanessa.ribes@ijm.fr). Students with a background in mathematics or computational science are encouraged to apply. Applicants should send us a CV and motivation letter.
Phd program
1 Phd position is open for the project “Modelling OPCs diversity of the hindbrain and their lineage derail during DMG oncogenesis using brain organoids” : – Apply before March 14th