Dosage compensation of sex chromosomes through X-chromosome inactivation (XCI) is required for mice extra-embryonic tissue growth and embryo development. The species specificity in mechanisms and timi...

The flexibility of tethered molecules, such as those bound to biological membranes, is an important property that can influence molecular height, m...

Enseignement 2025-2026 : Qu’est-ce que l’information biologique (suite) ? Cours du 20 décembre 2025 : Introduction : approche computationelle du vivant Professeur : Thomas Lecuit Chaire Dynamiques du vivant Retrouvez les enregistrements audios et vidéos du cycle : https://www.college-de-france.fr/fr/agenda/cours/qu-est-ce-que-information-biologique Tous les enseignements du Pr Thomas Lecuit : https://www.college-de-france.fr/chaire/thomas-lecuit-dynamiques-du-vivant-chaire-statutaire https://www.youtube.com/playlist?list=PLOj9pZ2YNGZ84uMY6DhPnqpL1rq5qNAVJ Le Collège de France est une institution de recherche fondamentale dans tous les domaines de la connaissance et un lieu de diffusion du « savoir en train de se faire » ouvert à tous. Les cours, séminaires, colloques sont enregistrés puis mis à disposition du public sur le site internet du Collège de France. Découvrez toutes les ressources du Collège de France : https://www.college-de-france.fr Soutenir le Collège de France : https://www.fondation-cdf.fr/faire-un-don Suivez-nous sur : Threads : https://www.threads.net/@collegedefrance Bluesky : https://bsky.app/profile/college-de-france.fr Facebook : https://www.facebook.com/College.de.France Instagram : https://www.instagram.com/collegedefrance LinkedIn : https://fr.linkedin.com/company/coll%C3%A8gedefrance

Mediapart et « Libération » révèlent des images inédites du 25 mars 2023, filmées par les caméras-piétons des gendarmes. Elles montrent des consignes prohibées et dangereuses données par la hiérarchi…

Le Collège de France « ne prône, ni n’encourage, ni ne soutient aucune forme de militantisme », a affirmé l’établissement qui assure de sa « stricte neutralité (…) au regard des questions de nature po...

Spatial maps reveal dynamic epithelial-mesenchymal niches shaping pancreatic development and function.

Microfluidics involves the manipulation of flows at the microscale, typically requiring external power sources to generate pressure gradients. Alte...

Engineering organoids that faithfully replicate the intricate architecture and region-specific features of bodily organs and extraembryonic tissues remains a significant scientific challenge. Previously, we demonstrated that craniofacial skin organoids (cSkOs)—containing epidermis, dermis, and hair—could be generated by co-developing epidermal progenitors with cranial mesenchyme. Building on this approach, we precisely adjusted cellular composition and signaling environments to generate ventral skin organoids (vSkOs) with lateral plate mesoderm (LPM) progenitors, successfully recapitulating features of abdominal or groin skin. Modulating early BMP and FGF signaling redirected these vSkOs toward an extraembryonic fate, producing human amnion-like tissues, termed Amnioids. Like native human amnion, Amnioids rapidly expanded into large, avascular, hairless cysts, in sharp contrast to the primitive vasculature and abundant hair follicles of vSkOs. Single-cell RNA sequencing identified divergent molecular signatures and developmental trajectories, highlighting key roles for NOTCH, WNT, and YAP/Hippo signaling pathways. Functional studies further underscored mesenchymal-epithelial interactions and mechanical forces as critical regulators of epithelial expansion. Together, these models provide potent tools to investigate human development at the embryonic-extraembryonic interface, offering critical insights into congenital skin and amniotic disorders and opening new avenues for precision regenerative therapies. ### Competing Interest Statement K.R.K. and J.L. are inventors of a patent relating to the skin organoid technology discussed in this article (WO2017070506A1). A.P.L. and K.R.K. with Childrens Hospital Corporation have applied for a patents relating to Amnioid (PCT/US2024/033843 Priority Date 6.13.2023) and ventral skin technology. K.R.K. is a consultant to STEMCELL Technologies that has licensed the skin organoid technology. National Institute of Arthritis and Musculoskeletal and Skin Diseases, https://ror.org/006zn3t30, R01AR075018 National Institute on Deafness and Other Communication Disorders, https://ror.org/04mhx6838, R01DC017461 National Institutes of Health, R01HD113792 National Institutes of Health, R01HD085121 National Institutes of Health, R24HD000836