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Alexandre Mayran

@alexandremayran.bsky.social
340 followers 588 following 51 posts

Group leader at Institut Cochin #DevelopmentalBiology #GeneRegulation #StemCellEmbryoModels 📧 alexandre.mayran@inserm.fr

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Reposted by Alexandre Mayran
James Briscoe @jamesbriscoe.bsky.social · 08/06/2026
Our latest: Minimal essential requirements for neural tube self-organisation How does a single cell give rise to a tissue with the right cell types in the right proportions? We deconstruct and rebuild a self-organising tissue from first principles A thread🧵 www.biorxiv.org/content/10.6...
biorxiv.org
Minimal essential requirements for neural tube self-organisation
The reliable generation of diverse cell types in precise proportions is essential for the formation of functional tissues during embryonic development. Three-dimensional organoid models derived from p...
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Reposted by Alexandre Mayran
Paul Francois @pfrancois.bsky.social · 14/07/2026
New paper 🧵 What if the "landscape" that guides cell differentiation isn't fixed, but is sculpted, in real time, by the very cells moving through it? We call this a 'sandscape' : grains of sand that carve dunes as they move, while the dunes' shape simultaneously steers where the grains go next.
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Paul Francois @pfrancois.bsky.social · 14/07/2026
I hope you will enjoy the paper and the idea (sandscape ?). Feel free to send us feedback. Paper: arxiv.org/abs/2607.10903 Code: github.com/nacer-eb/Sandscapes A very fun collaboration with PhD student Nacer Boukacem and my friend Madhav Mani.
github.com
GitHub - nacer-eb/Sandscapes
Contribute to nacer-eb/Sandscapes development by creating an account on GitHub.
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Prisca Liberali @priscaliberali.bsky.social · 30/06/2026
It is out 😍 check it out!! Multiscale integration of tissue and chromatin context converts cell heterogeneity into stable intestinal patterning. @cschwayer.bsky.social @silviabarbiero.bsky.social @davidbrueckner.bsky.social @ehannezo.bsky.social www.cell.com/cell/fulltex...
cell.com
Multiscale integration of tissue and chromatin context converts cell heterogeneity into stable intestinal patterning
During regeneration, tissues must translate transient cellular variability into stable spatial organization. Tissue architecture generates a density-dependent window of heterogeneity in the mechanosen...
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Ctenophores Rock! @ctenophoresrock.bsky.social · 17/06/2026
What is the evolutionary origin of the organizer? New work from @kremnyovs.bsky.social, @tclebedeva.bsky.social & Hejnol Lab @uni-jena.de reports the blastopore lip of the #ctenophore Mnemiopsis leidyi, a member of the evolutionary sister group to all other metazoans, exhibits organizer activity.
nature.com
A blastoporal organizer in a ctenophore - Nature
Experiments using the comb jelly Mnemiopsis leidyi and the sea anemone Nematostella vectensis reveal that the emergence of a core signalling pathway may have been a key innovation enabling the transit...
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Reposted by Alexandre Mayran
Alexis Verger 🧬🧫🧪 @alexis-verger.cpesr.fr · 07/05/2026
#RIP Pierre Chambon (1931-2026) via @alainberetz.bsky.social one of the last giants in biology: PARP, nuclear receptors, RNA Pol II, nucleosome, promoters, split genes
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Jean Léon Maître @maitrejl.bsky.social · 09/03/2026
En tant que chercheur 👨‍🔬, je peux témoigner que la précarité administrative manufacturée par le racisme ambiant freine le travail de brillants 🌟 chercheurs étrangers qui nous font l'honneur de venir travailler en France 🇫🇷.
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Maik Bischoff @maikbischoff.bsky.social · 26/06/2025
Morphogenesis & Organogenesis! Part 1 (full) in the comments 👇 Comment if you'd like to be added (regardless of age or career stage!) Please post your own biology-related starter packs using #BioStarterPacks 🧬🔬🪰🐟🐁🌱
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Ina Sonnen @sonnenlab.bsky.social · 24/12/2025
Using fluorescence live imaging and an in vitro implantation model, we show that human embryo attachment begins with direct cell fusion via syncytin-2–MFSD2A interaction. With @hansclevers.bsky.social. Great work by @tnoordzij.bsky.social & @martinacelotti.bsky.social www.biorxiv.org/content/10.6...
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Teresa Rayon @trayon.bsky.social · 24/12/2025
A human embryo implantation model from the @Rugg-Gunn Lab *key for understanding the early extraembryonic-maternal interactions Congrats to everyone involved! It’s been great to see this project develop. Huge credit to the @babrahaminst.bsky.social authors 🥂🍾 www.cell.com/cell/fulltex...
cell.com
Modeling human embryo implantation in vitro
Building an in vitro model of receptive endometrium allows investigation of human embryo implantation and early post-implantation development and recapitulates the earliest stages in establishing the ...
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Reposted by Alexandre Mayran
Simon Cook @drsimoncook.bsky.social · 23/12/2025
Christmas has come early. Fantastic to see this beautiful study from Peter Rugg-Gunn's lab at The Babraham Institute published today. Congratulations to Matteo Mole, Sarah Elderkin, Irene Zorzan and all other authors! www.cell.com/cell/fulltex...
cell.com
Modeling human embryo implantation in vitro
Building an in vitro model of receptive endometrium allows investigation of human embryo implantation and early post-implantation development and recapitulates the earliest stages in establishing the ...
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Reposted by Alexandre Mayran
Naomi Moris @nmoris.bsky.social · 16/12/2025
Lovely little pre-Christmas present to see this out @natcellbio.nature.com! Some 🔥 new results in here since the biorvix incl (1) a new RARE-GFP reporter ✳️🙌, (2) additional NMP quantification 🔢, (3) no neural tube patterning on RA inhibition 🙅 etc. Enjoy! 😍 www.nature.com/articles/s41...
nature.com
Modelling co-development between the somites and neural tube in human trunk-like structures - Nature Cell Biology
Makwana, Tilley et al. generate human stem cell-based trunk-like structures approximating Carnegie stage 13–14 of development. They use them to model and study the development of the thoracic and lumbar trunk.
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Reposted by Alexandre Mayran
canaztekin.bsky.social @canaztekin.bsky.social · 02/12/2025
🎉 Our deconstructed, stem-cell–based approach to studying signaling centers and limb-development cell types is out! 🥳 So nice to see it in its final form after the preprint— and huge thanks to the community for all the enthusiasm and interest since then! www.science.org/doi/10.1126/...
science.org
Specialized signaling centers direct cell fate and spatial organization in a mesodermal organoid model
Stem cell–derived mesodermal organoids reveal how signaling centers guide cell fate and tissue organization.
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Reposted by Alexandre Mayran
Joaquina Delas @joadelas.bsky.social · 18/11/2025
It's always special when you find your own paper in the table of contents of the journal 😍 "The cis-regulatory logic integrating spatial and temporal patterning in the vertebrate neural tube" -> Now out in its final form www.cell.com/developmenta...
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Olga Rosspopoff @orpsf.bsky.social · 15/11/2025
Thrilled to share our new review in Current Opinion in Genetics & Development on TE driven innovation in gene regulation🤘. I am honored to be part of this with two major TE aficionados @cedricfeschotte.bsky.social and @trono-lab.bsky.social #TEsky #TEworldwide authors.elsevier.com/c/1m6MC,LqAZ...
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Alexandre Mayran @alexandremayran.bsky.social · 17/11/2025
Happy to present the final version of our Cadherin and gastruloid manuscript, online at @cp-cellreports.bsky.social. www.cell.com/cell-reports... Initially in BiorXiv (www.biorxiv.org/content/10.1...) 1/12
cell.com
Cadherins modulate the self-organizing potential of pseudo-embryos
Gastruloids derived from ES cells mimic embryonic patterning through robust self-organization. Mayran et al. uncover that this competence depends on a cadherin switch regulated by Snai1-driven E-cadhe...
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Reposted by Alexandre Mayran
Christa Buecker @chribue.bsky.social · 06/11/2025
And we have another open position, this time with a focus on Genome Biology! Join a great community in Vienna to bring your research to the next level!
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Maxim Greenberg @maxvcg.bsky.social · 28/10/2025
Spread the word! There is a professor position opening at our University @upcite.bsky.social. There are several possible (great) labs to join, but if you are interested in DNA methylation and epigenetics in mammals, don't hesitate to contact me directly!
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Campàs Lab @campaslab.bsky.social · 28/10/2025
Really excited to present the results of a fantastic collaboration with Jesse Veenvliet @jesseveenvliet.bsky.social @mpi-cbg.de @poldresden.bsky.social 🤩 We find a unique mechanism for body axis elongation in mammals, different from other vertebrate species ➡️ www.biorxiv.org/content/10.1...
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Paul Francois @pfrancois.bsky.social · 15/10/2025
thanks for sharing this tool. I was all the more impressed that I also gave it 'non' biological papers : it found very technical gaps. It also scans and interprets the figures, and all of this is done very quickly. I honestly think this approach is going to revolutionize our way to deal with papers.
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Bart Deplancke @bartdeplancke.bsky.social · 06/10/2025
🧵1/ Excited to share our new paper introducing a new #singlecell assay: scTF-seq, a high-throughput single-cell approach to explore how transcription factor (TF) dose shapes cell identity and reprogramming outcomes. 🔗 www.nature.com/articles/s41... Big congrats to the entire team @EPFL & @SIAT_China
nature.com
Dissecting the impact of transcription factor dose on cell reprogramming heterogeneity using scTF-seq - Nature Genetics
This study introduces single-cell transcription factor (TF) sequencing, a single-cell barcoded and doxycycline-inducible TF overexpression approach that reveals dose-sensitive functional classes of TFs and cellular heterogeneity by mapping TF dose-dependent transcriptomic changes during the reprogramming of mouse embryonic multipotent stromal cells.
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Judith Pineau @judithpineau.bsky.social · 03/10/2025
In this beautiful system, we could show uncoupling of gene expression profiles, morphology and patterning… #NotInTheGenes 😉 (also includes a method to do long term 🔬 of elongating gastruloids) Thank you to all involved @jeromewongng.bsky.social @thomasgregor.bsky.social @alexandremayran.bsky.social
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CNRS Biologie @cnrsbiologie.bsky.social · 29/09/2025
#ResultatScientifique 🔎| Faire taire les gènes est aussi crucial que les activer : le répresseur Snail révèle son rôle essentiel dans le développement embryonnaire 🧬 ✍️ @laghalab.bsky.social et Ovidiu Radulescu 📕 @natcomms.nature.com | buff.ly/pmtzA1t
buff.ly
L’art délicat de faire taire les gènes
Le développement embryonnaire ne requiert pas uniquement l’activation des gènes, mais également une régulation fine de leur répression.
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Aurelie Hintermann @aurhin.bsky.social · 17/09/2025
Are digits modified fins, or evolutionary innovations? Read how we tackled this old question from a new angle🧪 A story with @chasebolt.bsky.social, @homeobox.bsky.social and myself, coordinated by @denisduboule.bsky.social from @college-de-france.fr and published in @nature.com today! #InHoxWeTrust
hoxd13a reporter in a zebrafish larva
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Denis Duboule @denisduboule.bsky.social · 17/09/2025
Out today. 🙏 again to everyone for this wonderful piece of work, in particular to Aurelie @aurhin.bsky.social Chase @chasebolt.bsky.social and Brent @homeobox.bsky.social. 🙏 also to the Harris lab @fish4walking.bsky.social and @neilshubin.bsky.social @biology-unige.bsky.social @college-de-france.fr
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canaztekin.bsky.social @canaztekin.bsky.social · 15/09/2025
🚀 Looking for a Bioinformatician / Data Scientist to join our crew and explore regeneration through single-cell genomics & evolutionary biology! @mpi-bio-fml.bsky.social 📩 Questions? Contact us ✉️ 🔗 Apply here: www.mpg.de/25243280/bio...
mpg.de
Bioinformatician / Data Scientist (m/f/d)
Bioinformatician / Data scientist position in the Aztekin Lab focusing on Structural Regeneration and support the working group together with the other members
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François Leulier @francoisleulier.bsky.social · 14/09/2025
Similar huge trend at last round of @erc.europa.eu grant application. @ec.europa.eu must adapt to this trend!
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Florence Niedergang @florenceniedergang.bsky.social · 06/09/2025
Pleased to announce launching Institut Cochin Foundation, on Sept. 18 at 6 p.m., upon registration, either in the Rosalind Franklin room, 22 rue Méchain, Paris or via video conference: presentation of @institutcochin.bsky.social, meet researchers and call for donations-thanks for your support!
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Taro Kitazawa @kitazawa-taro.bsky.social · 16/08/2025
Please RP. We are thrilled to announce that our lab’s first preprint is out! ”Whole-genome single-cell multimodal history tracing to reveal cell identity transition” We report HisTrac-seq, a multiomic single-cell molecular recording platform. www.biorxiv.org/content/10.1...
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paveltomancak.bsky.social @paveltomancak.bsky.social · 10/08/2025
Looks like private funders, HHMI,CZI etc., are not going to “save” US research. Europe is setting up mechanisms to attract US researchers & it may work. But, common, target junior talent, don’t shower money on superstars who will be flying professors & return to US when the science winter passes.
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SFBD_BioDev @sfbd.bsky.social · 08/08/2025
Impressive work from @josesilvalab.bsky.social www.cell.com/cell/fulltex...
cell.com
A complete model of mouse embryogenesis through organogenesis enabled by chemically induced embryo founder cells
A small-molecule-only strategy enables reprogramming ESCs into embryo founder cells that give rise to a high-fidelity embryo model directly and efficiently. This embryo model replicates embryogenesis ...
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Jacob (Yaqub) Hanna - يعقوب حنا @jacob-hanna.bsky.social · 07/08/2025
1/n Fun journey continues: Our new @cp-cellstemcell.bsky.social paper out on how the Inherent & Dormant Plasticity of Mouse Naive PSCs can be "Exaggerated" to Directly form ~E8.5 Transgene-Free (TF) Mouse SEMs & WITHOUT inducing 8-16-Morula-like "Embryo Founder Cells". www.cell.com/cell-stem-ce...
cell.com
Transgene-free generation of mouse post-gastrulation whole embryo models solely from naive ESCs and iPSCs
Hanna and colleagues show that signaling pathway modulation amplifies the inherent flexibility of genetically unmodified mouse naive PSCs to adopt extra-embryonic cell fate potential. This endows them...
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Cell Stem Cell @cp-cellstemcell.bsky.social · 07/08/2025
Online Now! Transgene-free generation of mouse post-gastrulation whole embryo models solely from naive ESCs and iPSCs #stemcells
dlvr.it
Transgene-free generation of mouse post-gastrulation whole embryo models solely from naive ESCs and iPSCs
Hanna and colleagues show that signaling pathway modulation amplifies the inherent flexibility of genetically unmodified mouse naive PSCs to adopt extra-embryonic cell fate potential. This endows them with the competence to generate up to E8.5–E8.75 transgene-free stem cell-derived embryo models (TF-SEMs) that complete gastrulation and initiate organogenesis within complex extra-embryonic compartments ex utero.
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Mounia Lagha @laghalab.bsky.social · 28/07/2025
#jobAlert We are hiring! If you like #imaging ,gene regulation and a dynamic group please apply. We are looking for a research assistant with a master degree and prior experience in academia.
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katja heuer @k4tj4.bsky.social · 27/07/2025
1 To predict the behaviour of a primate, would you rather base your guess on a closely related species or one with a similar brain shape? We looked at brains & behaviours of 70 species, you’ll be surprised! 🧵Thread on our new preprint with @r3rt0.bsky.social , doi.org/10.1101/2025...
Brain Surfaces of 70 primate species
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Alice Gros @alicegros.bsky.social · 15/07/2025
So excited to share my 1st paper !!🌞 Co-authored with @jules-vanaret.bsky.social @dunsingvalentin.bsky.social, we developped an integrated pipeline for imaging, segmenting and analysing cell-scale patterns in gene expression + tissue properties in complex 3D tissues elifesciences.org/reviewed-pre...
elifesciences.org
A quantitative pipeline for whole-mount deep imaging and analysis of multi-layered organoids across scales
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Juliane Glaser @julianeg.bsky.social · 09/07/2025
Finally out! 🥳 Our paper showing how a transposable element (TE) insertion can cause developmental phenotypes is now published @natgenet.nature.com 🧬🦠🐁 Below is a brief description of the major findings. Check the full version of the paper for more details: www.nature.com/articles/s41588-025-02248-5
nature.com
Enhancer adoption by an LTR retrotransposon generates viral-like particles, causing developmental limb phenotypes - Nature Genetics
Activation of an LTR retrotransposon inserted upstream of the Fgf8 gene produces viral-like particles in the mouse developing limb, triggering apoptosis and causing limb malformation. This phenotype c...
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Guillaume Andrey @guandrey.bsky.social · 09/07/2025
Our work bridging enhancer-promoter proximity to phenotypic outcomes in vivo is out! Shout out to @olimpiabompadre.bsky.social, to Marie Kmita's lab, and to all the co-authors. www.nature.com/articles/s41...
nature.com
Liebenberg syndrome severity arises from variations in Pitx1 locus topology and proportion of ectopically transcribing cells - Nature Communications
Here the authors show that reducing enhancer-promoter distance at the Pitx1 locus increases proportion of Pitx1 forelimb expressing cells, worsening skeletal defects in Liebenberg syndrome. They also ...
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Grace Bower @gracebower.bsky.social · 02/07/2025
A dream come true: my first first-author publication! 🧬 🎉 Working to unravel the mysteries of long-range gene regulation has been an incredible journey. Endless gratitude to Evgeny, the lab, and all of the amazing collaborators who helped make this happen 🙌
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Evgeny Kvon @evgenykvon.bsky.social · 02/07/2025
Our paper describing the Range Extender element which is required and sufficient for long-range enhancer activation at the Shh locus is now available at @nature.com. Congrats to @gracebower.bsky.social who led the study. Below is a brief summary of the main findings www.nature.com/articles/s41... 1/
nature.com
Range extender mediates long-distance enhancer activity - Nature
The REX element is associated with long-range enhancer–promoter interactions.
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Vicki Metzis @vmetzis.bsky.social · 27/06/2025
Checkout the full story online now at Dev Cell, the product of a team effort with the help of our fantastic collaborators including @da-bar.bsky.social @borislenhard.bsky.social @mpercharde.bsky.social Article link: doi.org/10.1016/j.de...
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IBDM, Institut de Biologie du Développement de Marseille @ibdm.bsky.social · 27/06/2025
🥇Sham Tlili has been awarded the CNRS 2025 Bronze Medal! She studies how physical forces shape living tissues by using mouse stem cell models known as gastruloids. A unique blend of physics & biology. 🔗 Read more: www.ibdm.univ-amu.fr/sham-tlili-w...
ibdm.univ-amu.fr
Sham Tlili, winner of the CNRS 2025 bronze medal - IBDM | Institut de Biologie du Développement de Marseille
A distinction that rewards a promising and already fruitful scientific career.
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Luca Giorgetti lab @FMI @lucagiorgetti.bsky.social · 26/06/2025
We are looking for a research assistant to join our lab and support ongoing projects with genome engineering in mouse embryonic stem cells! Please get in touch if you are interested. www.fmi.ch/education-ca...
fmi.ch
Friedrich Miescher Institute, open position
Friedrich Miescher Institute, open position
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Sten Linnarsson @sten.linnarsson.org · 25/06/2025
A major KI initiative to recruit new assistant professors with outstanding proposals in all areas of medicine, biomedicine and public health. We offer an amazing research environment, great colleagues and generous startup packages. Check it out and get working on your applications! (repost please!)
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Max Planck Institute of Immunobiology and Epigenetics @mpi-ie.bsky.social · 25/06/2025
We are excited to officially welcome a new group leader at the MPI-IE in #Freiburg. 🎉 Dr Juliane Glaser 🥳 – she studies epigenetic mechanisms of embryonic development, with a focus on transposable elements. 👉 Interview: www.ie-freiburg.mpg.de/6043545/2025... Welcome, @julianeg.bsky.social!
Portrait photo of Dr. Juliane Glaser
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Evgeny Kvon @evgenykvon.bsky.social · 23/06/2025
How do non-coding variants in enhancers lead to disease? Happy to share our recent work, led by @ewholling.bsky.social, in which we discovered that poised chromatin sensitizes enhancers to aberrant activation by non-coding mutations, contributing to disease. www.biorxiv.org/content/10.1... 1/
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Aydan Bulut-Karslioglu @bulutkarslioglu.bsky.social · 23/06/2025
⚠️ I am really excited to share the work of Anastasios Balaskas, an excellent PhD candidate in the lab, with the wider world. Tasos made a significant advance: generating a stem cell-based embryo model that contains both posterior and anterior neural tissues of the late-stage gastrulating embryo.
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bioRxiv Developmental Biology @biorxiv-devbio.bsky.social · 22/06/2025
An advanced head-to-tail mouse embryo model with hypoxia-mediated neural patterning www.biorxiv.org/content/10.1101/202…
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Axel Visel @axelvisel.bsky.social · 18/06/2025
Textbooks: “Enhancers are just a bunch of TFBSs” But how do they REALLY work? New paper with many contributors here @berkeleylab.lbl.gov, @anshulkundaje.bsky.social, @anusri.bsky.social A 🧵 (1/n) Free access link: rdcu.be/erD22
A meme-style comic panel with three parts. Left: A stylized enhancer with a mutation, surrounded by colored blocks representing functional motifs, a neural network diagram, chromatin accessibility signal traces, and a sequence motif. Two cartoon mouse embryos below show different LacZ reporter activity patterns. Top right: A hand hovers anxiously between two red buttons labeled “Experiments” and “AI,” with the caption “HOW DO ENHANCERS REALLY WORK?” Bottom right: A sweating superhero wipes his forehead, looking stressed about the difficult choice.
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