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Luc Mathis a partagé ceciWorld Agri-Tech highlighted an exciting wave of technologies reshaping crop improvement: targeted recombination, editing the “dark genome,” fine-tuning gene expression, multiplexing complex traits, and engineering disease resistance and climate traits. The challenge now is also a business one: combining these technologies with advanced genetics and commercial germplasm — and bridging two very different cultures and timelines: fast-moving, VC-backed entrepreneurs and long-term, more conservative breeders. Add the importance of climate resilience, food security, healthy nutrition and impact — and the incredible people working across this ecosystem — and it makes agriculture a particularly purposeful place to innovate.Luc Mathis a partagé ceciAgtech doesn’t have an innovation problem. Increasingly, it has an adoption problem. That was one of the biggest takeaways from this year’s World Agri-Tech Innovation Summit in London. There was plenty of excitement around gene editing, biologicals and AI. But little shiny-new-object syndrome. Instead, conversations kept returning to the fundamentals: · Does the technology actually fit into existing farm systems? · Who pays for adoption when farmer margins are already squeezed? · Can regulation keep pace with innovation? · Are agribusinesses becoming more willing to source technology externally? · And are we investing enough in distribution, local validation and agronomic support to turn innovation into something farmers can actually use? The technology is increasingly there. The bigger challenge is building the regulatory, financial and commercial machinery to get it onto farms. Takeaways from World Agri-Tech 👇 https://lnkd.in/g9f_esuw #AgTech #Agriculture #Agrifood #Innovation #GeneEditing #Biologicals #FoodSecurity #WorldAgriTech World Agri-Tech Gary Scattergood Jane Byrne Rt Hon George Eustice Giacomo Bastianelli Peter Beetham Dominic Hall Lotte Westerhof Michael Lee Antony Yousefian Paimun (PJ) Amini Christine R Gould Jean-Francois Jeff Déchant Cian Duggan Tom Greene Alexandra (Ali) Morrow
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Luc Mathis a partagé ceciThe European Parliament’s adoption of the NGT regulation this week feels particularly meaningful to me. For the past 20 years, I have had the privilege of working in plant genome engineering and crop innovation — from Cellectis and Calyxt, through Meiogenix, and now Tweegene. Back in the mid-2000s, these technologies were still largely experimental. I was fortunate to be part of the early wave of pioneers working to bring genome engineering into agriculture. We engaged with many of the companies, scientists and policymakers shaping the field, including Sangamo, Sigma-Aldrich, Life Technologies, Pioneer, Monsanto and Bayer, while helping establish the scientific, regulatory and commercial foundations that would enable these technologies to reach the market. I still remember presenting these technologies to the European Commission and participating in discussions with seed industry leaders, regulators and policymakers across Europe. Over the years, I have been fortunate to witness important milestones, from the first USDA regulatory determinations for genome-edited crops to the commercialization of the first gene edited products in the United States. Today’s decision is an important step toward giving European researchers, breeders and entrepreneurs a framework that allows innovation to contribute to food security, sustainability and climate resilience. Finally, I would like to acknowledge and thank the many academic researchers, entrepreneurs, industry partners and colleagues across the sector who have helped build this field over the past two decades. Whether as collaborators, partners or friendly competitors, we collectively created the ecosystem that is now making it possible for these technologies to contribute to the future of agriculture. #NGT #PlantBreeding #GenomeEditing #AgTech #CropInnovation #Biotechnology #AgricultureLuc Mathis a partagé ceci🌿A landmark step for plant innovation in Europe. The European Parliament’s adoption of the NGT regulation on June 17, 2026 is a strong signal for the future of agricultural innovation in Europe, and we welcome it. At Tweegene, we are developing a new crop improvement platform that expands the genetic potential of plants through the induction of endogenous tandem duplications. This approach creates novel sources of genetic variation for breeding, using mutagenesis-based methods fully compatible with the European regulatory framework. As Europe moves toward a more innovation-friendly environment for plant breeding, we believe a diversity of technologies will be essential to address the challenges of food security, sustainability, and climate resilience. If you are active in crop innovation, we’d be delighted to connect and explore potential collaborations. Reach out at www.tweegene.com #AgTech #PlantBreeding #NGT #CropInnovation #GeneticInnovation #Agriculture #FoodSecurity #ClimateResilience
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Luc Mathis a partagé ceciGreat to see this work from our Leiden co-founders and collaborators published in Nature Communications. It highlights the strong foundational science behind Tweegene. Opening the door to a different way of engineering genomes: controlling gene expression instead of disrupting genes.Luc Mathis a partagé ceciWe’re excited to share that our collaborators and co-founders from Leiden University have just published a new paper in Nature Communications. In this study, the team uncovers how TONSL suppresses polymerase-theta–dependent tandem duplications through chromatin-guided DNA repair — providing new insights into how cells maintain genome stability. These fundamental discoveries are part of the scientific foundation behind the technologies we are developing at Tweegene. Congratulations to our Leiden partners and co-founders on this important publication. Read the paper here: https://lnkd.in/ei78BXeN We look forward to continuing translating cutting-edge genome biology into transformative technologies. #Biotech #Genomics #DNARepair #GenomeStability Lejon Kralemann Marcel Tijsterman Luc Mathis Thibault D.TONSL suppresses polymerase theta-dependent tandem duplications through chromatin-guided repair - Nature CommunicationsTONSL suppresses polymerase theta-dependent tandem duplications through chromatin-guided repair - Nature Communications
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Luc Mathis a partagé ceci🚀 Launching Tweegene Tweegene is a new venture developing a novel approach to crop improvement based on targeted duplication of endogenous genes, enabling physiological increases in gene expression to enhance valuable agronomic traits. The company builds on the research of Prof. Marcel Tijsterman at Leiden University Medical Center and is supported by Agrilife Studio. We are currently finalizing the company setup, licensing agreements and seed financing, and we look forward to starting collaborations with partners across the crop innovation ecosystem. 🌿 Tweegene will present at the Innovator Pitch during CROP Innovation & Business 2026. If you will be attending, let’s meet to discuss the technology and potential R&D partnerships. Learn more: www.tweegene.com Feel free to reach out if you would like to explore collaborations. #AgTech #PlantBreeding #CropInnovation #Genetics #CropIB Thibault D. Antoine Coutant Priscilla Rozé-PagèsLuc Mathis a partagé ceci🚀 New Frontiers in Agri-Innovation: Meet the Innovators Startups at the forefront of agri‑tech will present their technologies, services, and products during the Innovator Pitch program at the upcoming CROP Innovation & Business conference. 💡 As we explore new frontiers in crop innovation, these startups will showcase ideas that push the boundaries of what’s possible in agriculture. We are proud to share the list of this year’s selected Innovators. 🌿 Aardaia (NL) - Padraic Flood 🌿 AquaBoostNano (Serbia) - Milan Župunski 🌿 BetterSeeds (Israel) - Tal Sherman 🌿 Carapace Biopolymers (NL) - Marouschka Blahetek 🌿 FluidLab d.o.o. (Slovenia) - Tilen Kranjc 🌿 Plan Z, Biotech Solutions (Slovenia) - Klemen Zupancic, PhD 🌿 Soilytix (Germany) - Julien Winkel 🌿 Tweegene (France) - Luc Mathis 🌿 Verdia Diagnostics (US) - Zach Hetzler Join us as these outstanding innovators take the stage at the CropIB 2026 Innovator Pitch Program. Don’t miss your chance to experience their breakthroughs firsthand — secure your ticket today! 🎟️ www.cropib.com The Innovator Pitch Program is supported by biotope by VIB, CEPLAS - Cluster of Excellence on Plant Sciences and StartLife. Leon Mur ¦ Shivam Sharma ¦ Francesco Stagni ¦ Samuel Rapolu ¦ Bernadette Sztojka ¦ Eswar Narayanan ¦ Nikita Sajeev, PhD ¦ Anne Helfer
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Luc Mathis a partagé ceciExcited to join AgriLife Studio as Venture Partner to co-found biotech startups in the AgriFood space. Bringing Bus Dev, Board and CEO experience from Cellectis (BD in Healthcare, bioproduction & Agtech), Calyxt (AgTech, Nasdaq), Micropep (Biocontrol), Global Bioenergies (cosmetics, L’oreal), Meiogenix (AgTech, €21M+ Series A, Bayer & Cornell partnerships). Looking forward to building the next generation of impactful AgriFood ventures! https://lnkd.in/ePPPRcRZLuc Mathis a partagé ceci🎉 Welcome Luc Mathis, Venture Partner at Agrilife Studio! A seasoned biotech entrepreneur, Luc joins AgriLife Studio to co-found high-impact startups in the AgriFood space. With a scientific background from the Institut Pasteur and Caltech, he contributed to the growth of Cellectis co-founded Calyxt in Minneapolis (listed on Nasdaq), led Meiogenix (partnerships with Bayer, Cornell, €21M+ Series A raised from international investors), and supported several deeptech companies including Global Bioenergies and SYMFLOR. 🌱 Luc brings a rare blend of scientific insight, business development expertise, and international network to help build the next generation of breakthrough AgriFood biotech ventures.
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Luc Mathis a partagé ceciGreat stuff 🙏 #agbiotech #geneediting
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Luc Mathis a partagé ceciUnique opportunity in #AgTech & #geneediting: Research Scientist, Delivery and Plant Transformation
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Luc Mathis a republié ceciLuc Mathis a republié ceciMeiogenix Hires Ricardo Garcia de Alba as CEO to Lead the Company through its Next Phase of Growth. https://lnkd.in/gDAU8-piMeiogenix Hires Ricardo Garcia de Alba as CEO to Lead the Company through its Next Phase of GrowthMeiogenix Hires Ricardo Garcia de Alba as CEO to Lead the Company through its Next Phase of GrowthMeiogenix
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Luc Mathis a partagé ceciThrilled to be invited at the round table about the future of food at the BPI today ! There are so many facets, from our relationship with emotions, how the microbiome is such a big regulator of health & mood, technical & scientific aspects, the complexity of the AgriFood value chain, and global sustainability / safety / climate impact. Looking forward to sharing experiences on this amazing topic !Luc Mathis a partagé ceci📣 Rejoignez-nous pour Les Look Up du Hub : Cuisiner l'avenir, nos assiettes en 2030 🍳 Participez à notre événement interactif dédié à l'innovation dans l'industrie culinaire. Découvrez comment les startups et les entreprises transforment le secteur avec des idées et des technologies novatrices. 📅 Date : 13 juin à 18h15 📍 Lieu : Bpifrance - Le Hub - 6-8 boulevard Haussmann - 75009 Paris 🔗 Inscription : https://lnkd.in/efRQasXs #Innovation #Culinaire #Startup #Evenement #LookUpDuHub Raphael Haumont Simon Ferniot Luc Mathis Dr. Catherine Renard, HDR
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Luc Mathis a réagi à ceciThis world first in skincare makes me very proud of what we do at AFYREN ! Our innovations are not often visible in the consumer space, so let’s highlight this one with our partner ESSE !Luc Mathis a réagi à ceciA world first in skincare!🌍 Until now, the propionic acid used in industry came mostly from petroleum. Today, thanks to AFYREN, it's 100% natural, #biobased and COSMOS-certified. Our partner Esse Skincare is launching Esse Barrier Rescue, the world's first skincare product formulated with our natural propionic acid, available worldwide to skincare professionals and consumers. The cream combines propionic acid and ceramides to soothe very dry, reactive skin while supporting its microbiome. 🏭 Our ingredient is produced through natural fermentation at our AFYREN NEOXY biorefinery, using a circular, low-carbon process. Performance, naturalness and defossilization now go hand in hand. And this is just the beginning. 🚀 #Greentech #Biotech #Innovation #EsseBarrierRescue
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Luc Mathis a aimé ceciLuc Mathis a aimé ceci𝐂𝐡𝐢𝐦𝐢𝐞 𝐛𝐢𝐨𝐬𝐨𝐮𝐫𝐜𝐞́𝐞, 𝐩𝐡𝐨𝐭𝐨𝐜𝐚𝐭𝐚𝐥𝐲𝐬𝐞 𝐞𝐭 𝐝𝐞́𝐜𝐚𝐫𝐛𝐨𝐧𝐚𝐭𝐢𝐨𝐧 : Ayakem 𝐫𝐞𝐩𝐞𝐧𝐬𝐞 𝐥𝐚 𝐯𝐚𝐥𝐨𝐫𝐢𝐬𝐚𝐭𝐢𝐨𝐧 𝐝𝐞 𝐥𝐚 𝐥𝐢𝐠𝐧𝐢𝐧𝐞. 🏆 Lauréate du Concours i-Lab 2026, Ayakem développe une technologie de photocatalyse capable de transformer la lignine, coproduit de l’industrie papetière, en polyols biosourcés à haut rendement. 🎯 À la clé : des molécules pouvant entrer dans la fabrication de polyuréthanes et contribuer à réduire la dépendance de l’industrie aux ressources pétrochimiques. Née à l’ISCR-Institut des Sciences Chimiques de Rennes sous les tutelles de l’Université de Rennes, du CNRS, de l’Ecole nationale supérieure de Chimie de Rennes et de l’INSA Rennes - Institut National des Sciences Appliquées de Rennes, Ayakem s’appuie sur l’expertise de Jean-François Soulé, de 4elements et de Chimie ParisTech - PSL, avec le soutien de l’ADEME et de Bpifrance. Aujourd’hui dirigée par Cédric Boisart et Olivier Fléchon, la startup poursuit le développement de sa technologie avec l’ambition de proposer des solutions biosourcées et performantes pour les industries de la construction et de la mobilité. 👏 Félicitations à toute l’équipe Ayakem pour cette belle reconnaissance ! 𝑆𝑢𝑟 𝑙𝑎 𝑝ℎ𝑜𝑡𝑜 : 𝐶𝑒́𝑑𝑟𝑖𝑐 𝐵𝑜𝑖𝑠𝑎𝑟𝑡, 𝑂𝑙𝑖𝑣𝑖𝑒𝑟 𝐹𝑙𝑒́𝑐ℎ𝑜𝑛, 𝐹𝑟𝑎𝑛𝑐𝑘 𝑇𝑒𝑠𝑡𝑜𝑛 𝑒𝑡 𝐶𝑒́𝑑𝑟𝑖𝑐 𝐶𝑎𝑏𝑟𝑎𝑙 #ILab #Deeptech #Innovation #Chimie #Photocatalyse #Biosourcé #Décarbonation #Recherche Auriane MATHIEU | Cédric CABRAL ALMADA, PhD | Benjamin TRINEL | Patrice Morel | Baptiste Clair | Franck T. | Cyrille Chapon | Tara DUONG | Alis David | Muriel Hissler | Marc Fourmigue | Boris Le Guennic | Pauline Allouche
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Luc Mathis a aimé ceciThank you AgFunder for this exclusive feature, and to Jennifer Marston for capturing our work so accurately, once again!Luc Mathis a aimé ceci🦺 🍓 AgFunder portfolio company news: Plantik Biosciences is teaming up with Hudson River Biotechnology to develop heat-tolerant crop traits—with the ambition to deliver a validated strawberry trait that any strawberry breeder can license. With extreme heat becoming a must-have consideration for flowering, fruit set, and yield quality worldwide, validation trials are already underway, starting with strawberries and leveraging Plantik’s prior heat-tolerance work in tomatoes 🍅 ... Ying Shao | Lotte Westerhof | #genomeediting #climateresilience #climate #deeptech #plantbreedingExclusive: Plantik and Hudson River Biotechnology team up to de-risk heat-tolerant strawberriesExclusive: Plantik and Hudson River Biotechnology team up to de-risk heat-tolerant strawberriesAgFunder
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Luc Mathis a réagi à ceciLuc Mathis a réagi à ceci14 years of World Agri-Tech London. And I’m still coming out of it pumped! 🚀🌱 Last week, we delivered another edition - and once again, it was packed with brilliant conversations, new connections, big ideas and plenty of debate about where agriculture and food are heading next. And judging by the posts I’ve been seeing across LinkedIn… I wasn’t the only one having a great time! 🙌 A big shout-out to the team who made it happen, with Craig, Milo and Waveney holding the reins on the partnership side while I’ve moved on to my new role. It’s fantastic to see the event continuing to go from strength to strength. And then there are the familiar faces. With some of you, we are now entering our sixth year of friendship - which is pretty special. Six years of conversations, collaborations, laughs, ideas and the occasional late-night debrief! 🤝 That, for me, is what makes these events so rewarding. It’s not just about the two days - it’s about the relationships and ideas that continue long after everyone has gone home. A huge thank you to everyone who joined us, contributed, connected and helped make this year’s event another memorable one. Now… let’s see what comes out of all those conversations. SAN FRANCISCO, WE'RE READY 🌍🌾 Brigid Jacqui Mark Patrice Thomas Elaine Marion Giulia Aidan CHRIS Limor Dylan Helene Dr. Alexander Romain Alexandre #WorldAgriTech #AgTech #Agriculture #FoodTech #Innovation
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Luc Mathis a réagi à ceciWe’ve been working on LX03™ behind the scenes for years. Today, I’m proud to share it with the world. This Christensenella minuta strain represents the kind of work we set out to do at Verb: find remarkable microbes, understand what makes them functionally distinct, and turn that science into something brands can use. LX03 brings a new mechanism to the biotics market, centered on the signals between the gut and liver. I’m proud of the team that brought it this far, and excited for what comes next!Luc Mathis a réagi à ceciMEET LX03!⚡️🧬🔬 Today, we’re launching our newest biotic solution, built around Christensenella minuta, a gut microbe closely associated with metabolic health. What makes LX03 different? It was selected for its ability to influence the signals between the gut and liver, connecting microbial activity to whole-body metabolic function. A new strain. A new way to think about metabolic health. A new frontier. → Watch the video below to meet LX03™ → And check out our new LX03™ webpage: https://lnkd.in/gdyGvczm #CMinuta #ChristensenellaMinuta #LX03 #MetabolicHealth #Probiotics
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Luc Mathis a aimé ceciLuc Mathis a aimé ceciAhead of its October 1 spinoff from Corteva Agriscience, incoming seed giant Vylor has announced #Xpedite™, a breakthrough proprietary system for producing non-GMO hybrid wheat scheduled to launch in late 2027. Multi-year trial results demonstrate a 10% average yield increase on identical acreage, rising to a 20% advantage in drought-stressed #environments while offering strong disease resilience. Developed via conventional breeding methods, the #technology functions across 100% of tested germplasm and requires no regulatory approvals or specialized farming machinery. The #commercial rollout will begin in North America with Hard Red Winter wheat in 2027, expanding to Soft Red Winter in 2029 and Hard Red Spring by 2030, with global licensing and branded distribution planned concurrently. Operating as a critical third pillar alongside corn and #soybeans, the platform is projected to generate $500 million in revenue by 2035 and reach $1 billion by 2040. Company leadership emphasized that doubling the annual rate of genetic gain will be vital for global #food security, addressing a crop that provides 20% of the world's daily caloric intake. Subscribe GrowinAgri Daily: https://lnkd.in/d-nueD_g Follow for Daily Updates on WhatsApp: https://lnkd.in/djr37x2A
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Luc Mathis a aimé ceciStronger together!Luc Mathis a aimé ceciStronger Together Against ToBRFV ENZA zaden and LVS are joining forces to tackle one of the biggest challenges facing tomato growers worldwide: Tomato Brown Rugose Fruit Virus (ToBRFV). We have a shared commitment to delivering sustainable solutions that strengthen food production and support the global tomato value chain. Together, we want to turn scientific innovation into practical solutions, helping growers stay ahead of emerging threats and securing tomato cultivation worldwide now and in future.
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Luc Mathis a aimé ceciPrès d’1 milliard d’euros investis dans la transition écologique au 1er semestre 2026 selon les chiffres du dernier baromètre des investissements Cleantech en France produit par #FranceInvest, GreenUnivers et EY. La dynamique d’investissement se maintient car les investisseurs ont intégré qu’il est question maintenant de souveraineté française et européenne, avec une prédilection pour les EnR et l’AgTech. Merci à #GreenUnivers et #EY pour leur participation à la production de ces données essentielles à la profession.Luc Mathis a aimé ceci📊 𝗕𝗮𝗿𝗼𝗺𝗲̀𝘁𝗿𝗲 𝗖𝗹𝗲𝗮𝗻𝘁𝗲𝗰𝗵 : 𝗹𝗲𝘀 𝗿𝗲́𝘀𝘂𝗹𝘁𝗮𝘁𝘀 𝗱𝘂 𝗽𝗿𝗲𝗺𝗶𝗲𝗿 𝘀𝗲𝗺𝗲𝘀𝘁𝗿𝗲 𝟮𝟬𝟮𝟲 𝘀𝗼𝗻𝘁 𝗱𝗶𝘀𝗽𝗼𝗻𝗶𝗯𝗹𝗲𝘀 France Invest a dévoilé ce matin son baromètre Cleantech du premier semestre 2026. 𝗔𝘃𝗲𝗰 𝟲𝟳 𝗹𝗲𝘃𝗲́𝗲𝘀 𝗱𝗲 𝗳𝗼𝗻𝗱𝘀 𝗿𝗲́𝗮𝗹𝗶𝘀𝗲́𝗲𝘀, 𝗽𝗼𝘂𝗿 𝘂𝗻 𝗺𝗼𝗻𝘁𝗮𝗻𝘁 𝗴𝗹𝗼𝗯𝗮𝗹 𝗱𝗲 𝟵𝟰𝟲 𝗠€. Cette restitution a permis de rendre compte de l'activité du capital-investissement en faveur des technologies propres et de mesurer l'engagement de nos membres dans le financement de la transition écologique. Merci à Sophie Pourquéry et Eric Marty, Co-présidents de la Commission Industrie & Transition écologique de France Invest, Patricia Laurent, Alexis Gazzo, Simon Ponroy, ainsi qu'à nos partenaires GREENUNIVERS, EY pour cette nouvelle édition. 👉 Retrouvez l'intégralité des résultats ici : https://lnkd.in/eZrU9Q3w
Expérience et formation
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Voir toute l’expérience de Luc
Découvrez son poste, son ancienneté et plus encore.
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Expériences de bénévolat
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President & Vice President
APS-Association Phobie Scolaire
- 9 ans
Droits civiques et action sociale
Development of a nation-wide parent association on school anxiety. Set up support groups to parents (online, by phone and meet-ups) in France, Belgium and Switzerland. Grew the association from less than a hundred members to support to over 13,000 families. Build a network of experts in France, Europe, Canada, USA. Communication & information campaigns: TV, radio, newspapers, web, LinkedIn
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Board member
French-American Chamber of Commerce MN
- 2 ans 4 mois
Sciences et technologie
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Board Member / Scientific Advisor
Association Francaise des Biotechnologies Vegetales
- 3 ans 4 mois
Sciences et technologie
Publications
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Stem cell growth becomes predominant while neural plate progenitor pool decreases during spinal cord elongation.
Developmental Biology
The antero-posterior dispersion of clonally related cells is a prominent feature of axis elongation in vertebrate embryos. Two major models have been proposed: (i) the intercalation of cells by convergent-extension and (ii) the sequential production of the forming axis by stem cells. The relative importance of both of these cell behaviors during the long period of elongation is poorly understood. Here, we use a combination of single cell lineage tracing in the mouse embryo, computer modeling…
The antero-posterior dispersion of clonally related cells is a prominent feature of axis elongation in vertebrate embryos. Two major models have been proposed: (i) the intercalation of cells by convergent-extension and (ii) the sequential production of the forming axis by stem cells. The relative importance of both of these cell behaviors during the long period of elongation is poorly understood. Here, we use a combination of single cell lineage tracing in the mouse embryo, computer modeling and confocal video-microscopy of GFP labeled cells in the chick embryo to address the mechanisms involved in the antero-posterior dispersion of clones. In the mouse embryo, clones appear as clusters of labeled cells separated by intervals of non-labeled cells. The distribution of intervals between clonally related clusters correlates with a statistical model of a stem cell mode of growth only in the posterior spinal cord. A direct comparison with published data in zebrafish suggests that elongation of the anterior spinal cord involves similar intercalation processes in different vertebrate species. Time-lapse analyses of GFP labeled cells in cultured chick embryos suggest a decrease in the size of the neural progenitor pool and indicate that the dispersion of clones involves ordered changes of neighborhood relationships. We propose that a pre-existing stem zone of growth becomes predominant to form the posterior half of the axis. This temporal change in tissue-level motion is discussed in terms of the clonal and genetic continuities during axis elongation.
Autres auteursVoir la publication -
Key role played by RhoA in the balance between planar and apico-basal cell divisions in the chick neuroepithelium.
Developmental Biology
The cell division axis determines the position of daughter cells and is therefore critical for cell fate. During vertebrate neurogenesis, most cell divisions take place within the plane of the neuroepithelium (Das, T., Payer, B., Cayouette, M., and Harris, W.A. (2003). In vivo time-lapse imaging of cell divisions during neurogenesis in the developing zebrafish retina. Neuron 37, 597–609. Haydar, T.F., Ang, E., Jr., and Rakic, P. (2003). Mitotic spindle rotation and mode of cell division in the…
The cell division axis determines the position of daughter cells and is therefore critical for cell fate. During vertebrate neurogenesis, most cell divisions take place within the plane of the neuroepithelium (Das, T., Payer, B., Cayouette, M., and Harris, W.A. (2003). In vivo time-lapse imaging of cell divisions during neurogenesis in the developing zebrafish retina. Neuron 37, 597–609. Haydar, T.F., Ang, E., Jr., and Rakic, P. (2003). Mitotic spindle rotation and mode of cell division in the developing telencephalon. Proc Natl Acad Sci U S A 100, 2890–5. Kosodo, Y., Roper, K., Haubensak, W., Marzesco, A. M., Corbeil, D., and Huttner, W. B. (2004). Asymmetric distribution of the apical plasma membrane during neurogenic divisions of mammalian neuroepithelial cells. EMBO J. 23, 2314–24). The cellular constraints responsible for this preferential orientation are poorly understood. Combining electroporation and time-lapse confocal imaging of chick neural progenitors, the events responsible for positioning the mitotic spindle and their dependence on RhoA were investigated. The results indicate that the spindle forms with a random orientation. However, the final orientation of cell divisions is dependent on two main factors: (i) an early rotation of the spindle that aligns it within the plane of the neuroepithelium, and (ii) a specific limitation of spindle oscillations, despite free rotation around the apico-basal axis. Expressing a dominant-negative RhoA leads to apico-basal cell divisions after a correct initial rotation of the spindle. Our data reveal a specific role for RhoA in the maintenance of spindle orientation, prior to anaphase. Thus, RhoA could be a key player potentially regulated by the neurogenic program or by the neural stem cell environment to control the balance between planar and apico-basal divisions, during normal or pathological development.
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