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Timothée Lionnet

@successprocess.bsky.social
1.9K followers 2.3K following 87 posts

faculty at NYU School of Medicine. We use advanced microscopy techniques to understand gene expression. Opinions my own. timotheelionnet.net

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Reposted by Timothée Lionnet
Anh Hoang Le, PhD 🏳️‍🌈🏴󠁧󠁢󠁳󠁣󠁴󠁿🇻🇳 @anhhle2702.bsky.social · 02/10/2026
Happy #FluorescenceFriday. Single immune cell migration is fascinating. But these cells can also behave like a coordinated collective, like 🐝 from a hive. I captured some embryonic myeloid cells (🔴) displaying swarming behaviour in a migrating ectoderm cell sheet (🔵), like neutrophils in our body!
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Craig Kaplan @triggerloop.bsky.social · 30/09/2026
Two extremely cool new papers on how AID gets targeted to appropriate genes for somatic hypermutation: paper 1 from Schatz lab at Yale shows that NELF and elongation components of the SEC are required- and suggests NELF can travel into genes /1 www.nature.com/articles/s41...
nature.com
Transcription pause and elongation regulators mediate somatic hypermutation - Nature
The molecular factors and mechanisms that mediate the chromatin recruitment of activation-induced deaminase and the generation of its stalled polymerase II substrate during somatic hypermutation are i...
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Paul Halpern @phalpern.bsky.social · 30/09/2026
In 1954, Albert Einstein was so upset by the Oppenheimer hearing and the McCarthy era attacks on the loyalty of scientists, that he said that if he were just starting out he'd become a plumber or peddler, instead of a physicist. He soon got an invitation to join a plumbing firm! #Einstein #science
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Valentin Dunsing-Eichenauer @dunsingvalentin.bsky.social · 25/09/2026
#FluorescenceFriday: Given the recently grown interest in ciliary beating, here is a movie of beating cilia in a human airway model that I captured last week with lattice light-sheet microscopy. No AI „processing“, this is the raw data! Frame rate is ca. 170fps, displayed here at 25fps.
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Silas Maniatis @manimota.bsky.social · 28/09/2026
In 2022 we published an open-source hardware, software, and protocols ecosystem for repurposing sequencers as automated fluidics coupled imaging instruments. On Oct 13 @yougotkunal.bsky.social & @nygenome.org will host a workshop on current applications. Register here: regenseq.github.io/meeting/
regenseq.github.io
RegenSeq Community Meeting 2026
Bringing together the RegenSeq community across multiplexed imaging, spatial transcriptomics, and optical pooled screening.
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Reposted by Timothée Lionnet
Carolyn Bertozzi @carolynbertozzi.bskyverified.social · 26/09/2026
On the importance of human judgement and ethical decision making. Two critical goals of university STEM education. www.aps.org/apsnews/2026...
aps.org
September 1983: Soviet officer defies military protocol, averting potential nuclear war
The American Physical Society is a nonprofit membership organization working to advance physics by fostering a vibrant, inclusive, and global community dedicated to science and society.
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Graham Dellaire @docdellaire.bsky.social · 26/09/2026
This is worth reading - a real world pilot of a lottery based grant funding system in Canada. TL;DR Pass/Fail with pass going to lottery and each reviewer (of 3 per grant) has a “unmissable” vote to give to a grant. If 2/3 of reviewers give an unmissable the grant gets funded with committee review.
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Timothée Lionnet @successprocess.bsky.social · 26/09/2026
great piece, along with giorgio.gilest.ro/the-weimar-o... I'm feeling somewhat protected because I evolve in an experimental data-driven field, but definitely feeling the flood coming, and the need for new incentives
giorgio.gilest.ro
The Weimar of knowledge – la bottega
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Heilemann Lab @heilemannlab.bsky.social · 25/09/2026
#FluorescenceFriday #STED pure and real 8-color STED microscopy & happy TxIF to everyone 🌴
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Nacho Molina @molinalab.bsky.social · 24/09/2026
Hey! You can have a look at our new preprint on #CellCycle regulation and #Pluripotency! A little thread 100% human 0% AI slop is coming (bear with me the mistakes). Let's thank first @maulik_nariya, the fantastic postdoc that led this project: www.biorxiv.org/content/10.6...
biorxiv.org
Comparison of cell-cycle gene expression dynamics and mRNA kinetics across mouse and human pluripotent systems
Cell-cycle remodeling is fundamental to pluripotency and lineage commitment, yet whether its transcriptional and post-transcriptional architecture is conserved across species and developmental states ...
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Joy Jeongyoon Choi @joyjoychoi.bsky.social · 14/09/2026
🧵 4/8: Here, we performed 3D-targeted FIB milling to capture the inactive X chromosome in ~130 nm thick lamella, then used cryo-electron tomography to directly visualise its native chromatin structure with contextual information at sub-single nucleosome resolution.
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Timothée Lionnet @successprocess.bsky.social · 14/09/2026
love to start the week with some gorgeous in situ chromatin structures!
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Martin Steinegger 🇺🇦 @martinsteinegger.bsky.social · 13/09/2026
Fold Spacer lets you fly through protein structures (Weekend project #2). It’s my first game: I originally set out to build a racer with structures as the tracks, but was a little too crazy. So it became this instead. You can upload your own structures. 🌐 martin-steinegger.github.io/Fold-Spacer/
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Timothée Lionnet @successprocess.bsky.social · 13/09/2026
wow, that's a huge loss. biomart is so useful and has been the perfect entry into data mining for so many projects, especially with trainees
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Timothée Lionnet @successprocess.bsky.social · 11/09/2026
ZATELLITE can be used to assess copy number in live cells for real time karyotyping! 🔬 It can also be repurposed to epigenetically edit 📝 the locus, by recruiting a second component to the ZF 🧲 This has been a great team effort - congrats to all involved! tinyurl.com/ZATELLITE (6/6)
tinyurl.com
ZATELLITE: a toolkit to visualize and manipulate human centromeres in live cells using synthetic zinc fingers
Changes in the number of chromosomes or their spatial organization within the nucleus have critical consequences for cell fate. Yet capturing the karyotype or three-dimensional architecture of chromat...
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Timothée Lionnet @successprocess.bsky.social · 11/09/2026
We then made a collection of ZF probes to label the centromeres of almost all human chromosomes. We validated them too 😎 We expect to have them ll in the coming months (5/n)
fluorescence images of cell nuclei showing foci for zinc finger probes tagging centromeres of most human chromosomes.
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Timothée Lionnet @successprocess.bsky.social · 11/09/2026
What about fluorescent dCas9? Well, upon tagging centromeres, it causes DNA damage in *up to 40% of tagged alleles*, and triggers detectable aneuploidy after 10d 💔 This doesn’t happen with ZFs, which label just as good! (4/n)
gamma-H2AX Immunofluorescence image + quantification showing that fluorescent dCas9 probes trigger DNA dammage when targeting centromeres, while Zinc Finger probes do not
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Timothée Lionnet @successprocess.bsky.social · 11/09/2026
ZATELLITE uses fluorescently-labeled ZFs designed with an AI model to target and label any DNA sequence. One plasmid, one transfection, and repetitive loci are readily visible as fluorescent foci ✨ (3/n)
cartoon showing the principle of ZATELLITE, and representative fluorescence image of cell nuclei with different copy numbers for chromosome 7 showing the matching number of foci for the ZATELLITE probes.
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Timothée Lionnet @successprocess.bsky.social · 11/09/2026
Imaging loci and karyotyping in live cells is critical to study genome organization and stability, but doing it non-invasively remains difficult: DNA FISH? 💙 but no live cells ❎ LacO/tetO arrays? Require genome engineering ❎ CRISPR? BIG, causes replication stress, hard to multiplex ❎ (2/n)
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Timothée Lionnet @successprocess.bsky.social · 11/09/2026
Sharing ZATELLITE 🛰️ - a tool to visualize and manipulate repetitive loci in living cells using designer zinc fingers tinyurl.com/ZATELLITE led by Nestor Saiz, collab with Marcus Noyes, @teresadavoli.bsky.social, @glennislogsdon.bsky.social, @liamholt.bsky.social & @jefboeke.bsky.social (1/n)
principle of ZATELLITE: synthetic Zinc Fingers are fused to a fluorescent protein and targeted to repetitive endogenous sequences - this ensures damage-free tagging, which is not the case with dCas9
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Timothée Lionnet @successprocess.bsky.social · 11/09/2026
congrats Philippe!
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Philippe Batut @philippebatut.bsky.social · 10/09/2026
🧬🔬 Why are enhancers transcribed and how does that impact gene regulation? I’m really excited to share our new paper in @science.org showing that noncoding RNAs control the timing of gene activation in embryos. With Mike Levine #ScienceResearch @columbiamed.bsky.social A few highlights below... 🧵👇
science.org
Noncoding transcription controls the developmental dynamics of long-range gene regulation
The genomic regions regulating gene expression are often themselves transcribed into a variety of noncoding RNAs (ncRNAs). However, the regulatory roles of this noncoding transcription remain largely ...
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Gabrijela Dumbović @gabrijelad.bsky.social · 09/09/2026
Incredibly happy to share the first publication from our lab, now published in Nature Cell Biology! 🎉 How do cells coordinate RNA processing with nuclear organization and the cell cycle? www.nature.com/articles/s41...
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Nick Stroustrup @nstroustrup.bsky.social · 05/09/2026
Did you know that the cells of old animals contain much less mRNA than the cells of young ones? Let me share with you some results from an ongoing project in the lab, where we are finding that a progressive depletion of total mRNA abundance is a crucial part of aging 1/22
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Timothée Lionnet @successprocess.bsky.social · 01/09/2026
happy labversary!
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Bart⚓️ @bartgonnissen.bsky.social · 31/08/2026
1/20 In 1990, Sean Connery took a Soviet submarine across the Atlantic in total silence. No propeller. A "caterpillar drive" that made Red October invisible to sonar. Two years later, Japan launched a real ship with no propeller at all. A small 🧵https://youtu.be/NSiAsQMBSRA
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Stefano Di Talia @ditalialab.bsky.social · 25/08/2026
We would like to add one or two postdocs to our lab in the next couple of years. If you are close to finishing your PhD and interested in the science we do, feel free to reach out to discuss opportunities.
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Job Dekker @jobdekker.bsky.social · 24/08/2026
How do nuclear compartments form inside cell nuclei? We show RNA glues certain loci together to form a nuclear compartment. This involves special GC-rich regions of highly expressed genes that also associate with nuclear speckles, but interactions between these loci are independent of speckles!
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bioRxiv Genomics @biorxiv-genomic.bsky.social · 24/08/2026
Formation of an RNA-mediated nuclear compartment www.biorxiv.org/content/10.64898/20…
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Erik van Nimwegen @erikvannimwegen.bsky.social · 21/08/2026
Remember this? bsky.app/profile/did:... Rigorous visualization of the structure in your high-dimensional data. Fantastic work by @dhdegroot.bsky.social With help of the reviewers of Nat Biotech it is now updated, extended an officially published here: www.nature.com/articles/s41... 1/n
nature.com
Bonsai reconstructs tree representations for distortion-free visualization and exploration of high-dimensional data - Nature Biotechnology
High-dimensional data are visualized through representation on tree structures.
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vincentholst.bsky.social @vincentholst.bsky.social · 13/08/2026
In 2023, @nature.com published 'Papers and patents are becoming less disruptive over time', receiving world-wide media attention. Our Matters Arising, published after a 32 month delay (more on that soon), shows that the reported decline can largely be attributed to dataset artefacts. 🧵
The average CD_5 index per year for Web of Science. The original Park et al. decline (top curve) becomes essentially flat (bottom curve) when removing papers with CD_5=1. Those papers largely correspond to dataset artefacts.
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Matthew Taliaferro @jmtali.bsky.social · 12/08/2026
Excited to share our newest work! We asked whether RNA molecules need to be in a specific place in the cell to do their job. We found that a single RNA must reach the midbody, the structure that pinches two dividing cells apart, for cell division to finish efficiently. 🧵⬇️
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Ignacio Vega-Vásquez @igvegvas.bsky.social · 07/08/2026
(1/4) We are very excited to share our latest preprint from @sauer-lab.bsky.social: Mega Expansion Microscopy (Mega-ExM)! We combine iterative hydrogel expansion with whole-proteome NHS labeling and post-expansion immunostaining, reaching tunable expansion factors up to ~1500× in whole cells 🤯
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Dr Kathleen Millen @neurodevkathy.bsky.social · 05/08/2026
🔬🧫 Biology friends. Who do you outsource cell line CRISPR editing to? We could do in my lab, but given people and time constraints I want to explore commercial $ to edit standard hES cell line - KO/cKO. Bonus if work is done in USA and not shipped to international facility.
static.klipy.com
SML Chef Pee Pee: The Crisper, The Better
Alt: SML Chef Pee Pee: The Crisper, The Better
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Paul Francois @pfrancois.bsky.social · 03/08/2026
One thing strikes me : while LLMs now seem to excel in maths, they have yet to produce any great book (despite having been trained on virtually everything available that was ever written, and having been used to produce text for several years now).
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Jay Shendure @jshendure.bsky.social · 30/07/2026
New preprint from Shendure Lab on Locus-Scale aka Long-@$$ MPRAs led by the amazing Abby McGee & @carinabiar.bsky.social Most MPRAs test ~300 bp fragments next to a promoter. But real enhancers are bigger, act combinatorially and from a distance. 1/n www.biorxiv.org/content/10.6...
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Stirling Churchman @stirlingchurchman.bsky.social · 28/07/2026
RNA-seq tells us how much RNA is present in the cell. But to understand gene regulation, we need to easily measure the synthesis and decay rates driving this abundance. We introduce AIR-seq: analog intrinsic recoding sequencing. (1/6) www.biorxiv.org/content/10.6...
biorxiv.org
Analog intrinsic recoding measures RNA dynamics without chemical conversion
Steady-state RNA abundance measurements mask the synthesis and decay rates that shape gene expression. Analog intrinsic recoding sequencing (AIR-seq) repurposes the base-pairing properties of N4-hydro...
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Luca Giorgetti lab @FMI @lucagiorgetti.bsky.social · 28/07/2026
Thank you @natgenet.nature.com for this nice Research Briefing www.nature.com/articles/s41... on our recent paper reporting live-cell measurements of Sox2 promoter bursting kinetics when varying its genomic distance from the SCR enhancer 👉 www.nature.com/articles/s41...
nature.com
The genomic position of an enhancer modulates bursting dynamics of the cognate promoter - Nature Genetics
We show that, in a genomic locus with minimal complexity, the distance between promoter and enhancer modulates the frequency of clustered transcriptional bursts. Thus, besides the nucleotide sequence,...
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Akis (Argyris) Papantonis @akispapantonis.bsky.social · 21/07/2026
Our latest is now out in @nataging.nature.com giving reason to celebrate! Led by talented Spiros Palikyras, it improves our preprint (posted 2 years ago!) dissecting the mechanism and functional consequences of CTCF clustering upon senescence commitment of human cells. www.nature.com/articles/s43...
nature.com
Senescent cells cluster CTCF on nuclear speckles to instruct an alternative splicing program - Nature Aging
Palikyras and colleagues investigate chromatin reorganization upon senescence induction, reporting that components of nuclear speckles coordinate chromatin rewiring and a senescence-associated splicin...
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David L. Stern @gallseeker.bsky.social · 20/07/2026
I have always wanted to be able to view the genome, protein, and protein structure at the same time. Last week I built this utility with Claude Science. Click protein domain to zoom to structure and genomic region. I hope you find it as revealing and useful as I do. github.com/DavidSternLa...
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Luca Giorgetti lab @FMI @lucagiorgetti.bsky.social · 15/07/2026
Our preprint is now out in @natgenet.nature.com ! doi.org/10.1038/s415... We measured Sox2 promoter bursting dynamics with the SCR enhancer positioned at different distances within a genomic locus devoid of confounding effects in mESC: Main findings in the 🧵 below:
doi.org
Enhancer control of promoter activity and variability via frequency modulation of clustered transcriptional bursts - Nature Genetics
Tünnermann et al. use live-cell imaging to study promoter activity under the control of an enhancer inserted at different genomic distances. RNA production from the promoter occurs in clusters of tran...
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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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The Downs Lab @thedownslab.bsky.social · 13/07/2026
So nice to see Pierre's @pierrecaron.bsky.social highlight of our preprint (led by @lillianwu.bsky.social ) was selected by @jcellsci.bsky.social to include in their latest issue. Also, what a great initiative - ended up reading them all! prelights.biologists.com/highlights/c...
prelights.biologists.com
CENP-B binds hairpin motifs in chromosome arms influencing gene expression - preLights
CENP-B escapes the centromere and plays a surprising role in gene regulation
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Kresten Lindorff-Larsen @lindorfflarsen.bsky.social · 10/07/2026
AF-CALVADOS is now published doi.org/10.1002/pro.... We combine AlphaFold and CALVADOS to simulate flexible multidomain proteins at scale: — Ensembles of >12000 full-length human proteins — Comparison of IDRs alone and I n context for >1500 TFs @sobuelow.bsky.social @kejohansson.bsky.social
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grimmrad 🧬🎼🖼️🏛️ @grimmrad.bsky.social · 30/06/2026
New review in Nature Reviews Cancer: "Imaging the hallmarks of cancer." A collaborative effort to map non-invasive clinically relevant in vivo imaging onto every cancer hallmark, separating what can be seen directly from what is only accessible via surrogates. 🧵 doi.org/10.1038/s415...
doi.org
Imaging the hallmarks of cancer - Nature Reviews Cancer
In this Review, Grimm et al. describe the range of non-invasive diagnostic imaging approaches to monitor the various hallmarks of cancer and how their implementation is shaping clinical practice.
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Christophe 🔬 Leterrier @christlet.bsky.social · 08/07/2026
Are tapes a good option for long-term cold storage of microscopy data? I'm looking at storing ~200 TB with no recurring fee (no cloud) and with as little esoteric server/command line fuss as possible www.ibm.com/fr-fr/produc...
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Loïc A. Royer 💻🔬🧪 @loicaroyer.bsky.social · 29/06/2026
1/ 🧬🔬 How does one cell become an entire animal? We can now film it in 3D 🐟, but turning those movies into accurate cell tracks is brutally hard. Enter our new #Kaggle challenge: $60K prize pool, to help crack 3D+time cell tracking at scale! 🧵👇 www.kaggle.com/competitions... @biohub.org
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Mir Lab @mirlab.bsky.social · 07/06/2026
1/🧵 Can transcription factor condensate formation be explained without phase separation? Our new preprint introduces SPARK, a simulation tool that reproduces condensate behavior (clustering, fusion, FRAP) from diffusion & binding kinetics alone. Movie: 60 sec FRAP sim www.biorxiv.org/content/10.6...
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Ali Shaib @alishaib.bsky.social · 01/06/2026
Hello #world, meet 1,000× Expansion Microscopy. A small gel would grow to the size of an Olympic swimming pool, while amino-acid-scale distances become visible with ordinary light microscopy. Led by Helena Hu from @eboyden3.bsky.social's lab, in collab with us. Story: www.biorxiv.org/content/10.6...
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Rob Klose @robklose.bsky.social · 29/05/2026
Help please! We need to do some large(ish) cell culture inhibiting E-cadherin with a monoclonal antibody. Does anyone have the DECMA-1 hybridoma cell line so we could purify our own antibody? or a similar monoclonal that would do the job. Any help greatly appreciated, just DM me. Please repost!
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