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Arjun Udupa

@udupaarjun.bsky.social
274 followers 669 following 10 posts

PhD Student with @marcbuhler.bsky.social at @fmiscience.bsky.social Master's in Heidelberg, thesis with @karsten-rippe.bsky.social Editorial assistant at the @nightsciencepod.bsky.social gene regulation, chromatin, nuclear organisation, synthetic biology

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Reposted by Arjun Udupa
Itai Yanai @itaiyanai.bsky.social · 08/10/2026
Friends in Israel! Come to my workshop at the Technion on the 'night science' creative scientific process, on October 25th at 10am. Free registration: forms.cloud.microsoft/pages/respon...
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Reposted by Arjun Udupa
Marvin Tanenbaum @marvintanenbaum.bsky.social · 08/10/2026
Did you ever want to sequence that one interesting cell you observed in your microscopy experiment? We have a new pre-print out today that describes a genetic barcoding method, Waldo, to perform live-cell imaging and single-cell sequencing on the same single cells. www.biorxiv.org/content/10.6...
biorxiv.org
Linking live-cell imaging to single-cell sequencing using genetic barcoding
Linking cellular phenotype to genotype and gene expression is a central goal in biomedical research. Live-cell imaging captures dynamic cellular phenotypes, whereas single-cell sequencing measures gen...
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Reposted by Arjun Udupa
Itai Yanai @itaiyanai.bsky.social · 07/10/2026
Andre Geim is the only scientist to win both the Nobel Prize (Physics, 2010) and the Ig Nobel Prize (for levitating a frog in 2000). His secret? He says it was to set up an environment in his lab for doing experiments from a sense of play and a spirit for adventure!
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Cell - a Cell Press journal @cp-cell.bsky.social · 06/10/2026
Now online! SPARCS enables scalable recovery of complex image-based phenotypes for genetic screening
dlvr.it
SPARCS enables scalable recovery of complex image-based phenotypes for genetic screening
Current genetic screens face a trade-off between scaling to large mutant libraries and measuring information-rich phenotypes. SPARCS automates laser microdissection to enable pooled forward genetic screens for complex image-based phenotypes at scale. By physically recovering individual mutants, SPARCS supports multimodal profiling of hits beyond genotyping, including via mass spectrometry-based proteomics.
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Reposted by Arjun Udupa
Tugce Aktas @aktast.bsky.social · 06/10/2026
I am thrilled to share our newest work in collaboration with Zack Smith’s lab. This is one of the 3 papers created by this fruitful partnership mainly driven by our star postdoc Yusuke Kijima. www.biorxiv.org/content/10.6...
biorxiv.org
Epigenetic regulators partition the genome by evolutionary and developmental constraint
Many epigenetic regulators play essential roles in animal development, but precisely how they function across different cell types without clear sequence preferences remains a foundational challenge. ...
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Reposted by Arjun Udupa
Epigenetics at Helmholtz Munich @epihmgu.bsky.social · 06/10/2026
Save the date! The 10th Munich Epigenetics Spotlight 📅 30 Oct 2026, 14:00–19:00 at Helmholtz Großhardern. Join us for talks and discussion with keynote speakers Tuğçe Aktaş and Karsten Rippe. Organised by @metorrespadilla.bsky.social and @robertife.bsky.social #EpigeneticsSpotlight bit.ly/4jGd3WO
bit.ly
Munich Epigenetics Spotlight Meeting
This annual meeting takes place at Munich (DE) providing an instrumental platform to discuss the recent findings on epigenetics with the local community.
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Reposted by Arjun Udupa
bioRxiv Molecular Biology @biorxiv-molbio.bsky.social · 05/10/2026
A Structural Model of Transcriptional Activation by Mediator www.biorxiv.org/content/10.64898/20…
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Itai Yanai @itaiyanai.bsky.social · 02/10/2026
This week we held our second-ever “train the trainer” event in Heidelberg at EMBO/EMBL to pass on our teachings on the creative scientific process to 50 instructors. We're on our way to achieving our mission of bringing creativity training to all scientists worldwide!
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Kazuhiro Maeshima @kazu-maeshima.bsky.social · 26/09/2026
🧬 Highly related @natgenet.nature.com paper from @binzmit.bsky.social group, using nucleosome-resolution chromatin modeling: Euchromatin forms condensed domains with short active regions on the surface www.nature.com/articles/s41... Congratulations! 🎉
nature.com
Euchromatin forms condensed domains with short active regions on the surface - Nature Genetics
Simulations integrating micro-C and imaging data provide a coherent view of chromatin organization from nucleosomes to clutches to domains, revealing that most regions form compact domains but short r...
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Cedric Feschotte @cedricfeschotte.bsky.social · 24/09/2026
Thrilled to see this published today! Truly special because we made the initial discovery >15 yrs ago! We found two copies of a human gene called BC200 embedded in a human poxvirus. BC200 blurs the line between gene & transposon—both functional & mutagenic! www.science.org/doi/10.1126/... 🧵1/n
science.org
Escape of the BC200 gene to a human poxvirus reveals its persistent transposition in primates
Transposable elements mobilize within and occasionally between genomes, including from host to virus. We identified two insertions of the human BC200 noncoding RNA gene in the poxvirus molluscum conta...
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Reposted by Arjun Udupa
bioRxivpreprint @biorxivpreprint.bsky.social · 23/09/2026
Transcription factors read a second regulatory code in chromatin www.biorxiv.org/content/10.64898/20…
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Lopes_Lab @lopeslab.bsky.social · 16/09/2026
Thrilled to share a new important study from the lab, published today in @nature.com, showing how cohesin mediates efficient replication fork plasticity and stress response, using its loop extrusion activity to promote 3D contacts on replicating DNA: www.nature.com/articles/s41...
nature.com
Cohesin reshapes replication fork contacts to aid fork slowing and reversal - Nature
Cohesin-mediated loop extrusion limits sister-fork coupling and tethers nearby replication forks under replication stress, promoting fork reversal and slowing fork progression to safeguard genome...
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Itai Yanai @itaiyanai.bsky.social · 17/07/2026
Maybe creativity is just how big a bag of tricks you have; how many different tricks you've seen, applied in different contexts. And perhaps some people have a little bit more skill remembering all those tricks or applying them in different situations. - Arjun Raj, @arjunraj.bsky.social
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Maria Hondele @mariahondele.bsky.social · 18/09/2026
The heatwave is finally over - just in time for our “Frosty Foci” to finally come online! ❄️🦠 We found that E. coli builds a transient nucleolus-like ribosome biogenesis compartment during cold adaptation, when RNA (mis)folding makes ribosome biogenesis challenging.
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Sergiu P. Pasca @sergiuppasca.bsky.social · 16/09/2026
Today in Nature @nature.com, we report a new approach to studying human brain development and modeling disease in vivo. Open article link below 👇
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FMI science @fmiscience.bsky.social · 16/09/2026
We’re hiring! The FMI Computational Biology Facility is seeking a Computational Biologist with experience in proteomics data analysis. Join a collaborative team working with scientists across the FMI to turn complex datasets into biological insight. Apply by Oct 25: www.fmi.ch/education-ca...
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Caitie McCafferty @computingcaitie.bsky.social · 16/09/2026
Experience w proteomics data analysis? Come to the FMI!! #proteomics #massspec
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Steven Banik @stevenbanik.bsky.social · 01/09/2026
Excited our ratiometric transcriptional activation (RTA) work led by postdoc Dr. Melissa Gray is out online today in Cell @cp-cell.bsky.social! Measurements determine what we can discover in biology; we use RTA to turn protein abundance changes into amplified signals in live cells.
cell.com
Ratiometric transcriptional activation by protein degradation
By tethering a protein of interest to anti-CRISPR, protein degradation is transformed into amplified and programmable transcriptional outputs via Cas-based transcription factors, with sensitivity to p...
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Reposted by Arjun Udupa
bioRxiv Molecular Biology @biorxiv-molbio.bsky.social · 15/09/2026
Enhancer Tuning by Sequence-Specific Repressors www.biorxiv.org/content/10.64898/20…
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Reposted by Arjun Udupa
Arnaud Krebs @arnaudkr.bsky.social · 14/09/2026
your starter pack for Single Molecule Genomics! Why you should do it (or not) - How you should do it. Collective effort with @vram142.bsky.social @stirlingchurchman.bsky.social @naltemose.bsky.social A Stergachis M Stadler W Greenleaf @embl.org rdcu.be/PmzSEV529GRa
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Vijay Ramani @vram142.bsky.social · 14/09/2026
Everything you wanted to know about single-molecule epigenomics but were too afraid to ask! Wonderful to co-write (h/t ENORMOUS lift by @arnaudkr.bsky.social) this primer on our nascent field. Also, a 💯 example of wonderful colleagues building something *together*, not in competition =)
nature.com
A practical guide to studying genome function using single-molecule genomics
Nature Reviews Molecular Cell Biology - Single-molecule genomics methods are used to study the activity of regulatory factors on individual DNA molecules genome-wide, thereby enabling...
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Reposted by Arjun Udupa
Joy Jeongyoon Choi @joyjoychoi.bsky.social · 14/09/2026
Excited to share our new preprint on in situ chromatin structure of the inactive X chromosome in differentiated female mouse embryonic stem cells. www.biorxiv.org/content/10.6... 🧵1/8
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Alex Radzisheuskaya @a-radzisheuskaya.bsky.social · 11/09/2026
We’re hiring! 🧬 We're looking for a Postdoctoral Training Fellow to join our group at the ICR in London and work on chromatin biology, transcription regulation and AML. Curious about how histone modifications shape gene regulation and cell identity? Come join us! jobs.icr.ac.uk/vacancies/15...
jobs.icr.ac.uk
Postdoctoral Training Fellow - Chromatin Biology and Epigenetics in Chelsea | The Institute of Cancer Research
View details and apply for this Postdoctoral Training Fellow - Chromatin Biology and Epigenetics vacancy in Chelsea . Salary: Salary range £45,600 - £51,450 per annum. Dependent on re...
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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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Reposted by Arjun Udupa
Rainer Friedrich @rainerfriedrichlab.bsky.social · 10/09/2026
Just out in Nat Neurosci: disentangling of neural odor manifolds in "olfactory cortex" of adult zebrafish after learning. Great work by Bo, Nesibe et al and wonderful collaboration with @sueyeonchung.bsky.social that fundamentally changed my view of olfactory cortex. www.nature.com/articles/s41...
rdcu.be
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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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Reposted by Arjun Udupa
Di Jiang @dijiang319.bsky.social · 10/09/2026
Online today @science.org Noncoding transcription controls the developmental dynamics of long-range gene regulation | Science www.science.org/doi/10.1126/...
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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Reposted by Arjun Udupa
Arnaud Krebs @arnaudkr.bsky.social · 10/09/2026
EMBL QBMM is back this year with an outstanding line-up! Plenty of talks will be selected from submitted abstracts, with emphasis on junior scientists and representation across diverse fields. The abstract deadline is the end of this week, so don’t miss out! www.embl.org/about/info/c...
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Arjun Udupa @udupaarjun.bsky.social · 09/09/2026
Awesome to see this out! Great work from the ChromNet team and @karsten-rippe.bsky.social to see this home. Glad to have made a contribution to the story :)
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Karsten Rippe @karsten-rippe.bsky.social · 09/09/2026
🧬 1/ HP1α marks silenced heterochromatin, but how does it repress, and what happens when transcription is switched on? On mouse fibroblast chromocenters, HP1α stays bound, its barrier is local, and the domain reorganizes nanodomain by nanodomain. 👉 @cp-molcell.bsky.social doi.org/10.1016/j.mo...
Schematic of the two experimental systems. Left, activators recruited to chromocenters of wild-type and Suv39h dn mouse fibroblasts, with DAPI and anti-HP1α images showing HP1α enrichment and loss. Right, the U2OS 2-6-3 reporter array with an activator recruited alone or together with HP1α.
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Kurianlab @kurianlab.bsky.social · 09/09/2026
Check this exciting study from @gabrijelad.bsky.social and colleagues: www.nature.com/articles/s41...
nature.com
The periphery of nuclear speckles defines a spatially and temporally regulated compartment of long-lived intron-retained RNAs that resolves during mitosis - Nature Cell Biology
Biayna, Baranovskii and colleagues report that intron-retained RNAs derived from cell cycle- and genome maintenance-related genes are pooled at the periphery of nuclear speckles and undergo synchronou...
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Kazuhiro Maeshima @kazu-maeshima.bsky.social · 08/09/2026
Is euchromatin really “open”? 🧬 Using super-resolution imaging🔬 our new study @natgenet.nature.com reveals: Euchromatin forms condensed domains in live cells. Cohesin constrains them and prevents domain mixing for proper transcriptional insulation🚧 🔗 www.nature.com/articles/s41... (1/2)
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Samuel A. Myers' lab @samyers-lab.bsky.social · 06/09/2026
With the sensitivity of modern LC-MS, analyzing changes in protein complexes across differing biological systems will lead to false positives from the background proteomes. We provide some work arounds This also allowed us to identify interesting biology concerning OGT-protein complexes #glycotime
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Cell - a Cell Press journal @cp-cell.bsky.social · 08/09/2026
Now online! Structural basis of a SWI/SNF-associated transcription pre-initiation complex
dlvr.it
Structural basis of a SWI/SNF-associated transcription pre-initiation complex
Cryo-EM and genetic analyses reveal that the SWI/SNF chromatin remodeler is an integral component of the transcription pre-initiation complex. The structures demonstrate how SWI/SNF facilitates transcription initiation through stabilization of PIC organization and concerted remodeling of the +1 nucleosome.
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Arnaud Krebs @arnaudkr.bsky.social · 07/09/2026
Is activation of multiple enhancers and promoters coordinated? Short answer is yes. Check full story from @mathias-boulanger.bsky.social @kasitc.bsky.social leveraging long read single molecule sequencing to address this. @embl.org www.cell.com/molecular-ce...
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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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Chloe Tang @chloetctang.bsky.social · 05/09/2026
Had an amazing week last week at #EMBLTranscript Full of inspiring talks and happy to have met many new friends!
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Anton Goloborodko @golobor.bsky.social · 03/09/2026
1/ out in @science.org! We found a new asymmetry in large-scale chromosome structure: sister chromatids are shifted by hundreds of kb in the 5′→3′ direction of their inherited strands! A close collaboration w/ @gerlichlab.bsky.social , led by @flaviacorsi.bsky.social www.science.org/doi/10.1126/...
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Di Jiang @dijiang319.bsky.social · 03/09/2026
⇄ This study suggests that human sister chromatids are consistently misaligned in the 5′→3′ direction of inherited DNA strands @science.org Conformational asymmetry of replicated human chromosomes | Science www.science.org/doi/10.1126/...
science.org
Conformational asymmetry of replicated human chromosomes
DNA replication generates sister chromatids with identical sequence, yet its mechanism is fundamentally asymmetric: Chromatids inherit strands of opposite orientation, whereas forks synthesize new str...
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Cell - a Cell Press journal @cp-cell.bsky.social · 01/09/2026
Now online! Live-cell transcriptomics with engineered virus-like particles
dlvr.it
Live-cell transcriptomics with engineered virus-like particles
Najia, Le, Borrajo et al. establish “cellular self-reporting,” a technology to export molecular analytes from cells in virus-like particles. The authors demonstrate how mRNA export enables longitudinal transcriptome-wide profiling of living cells by sampling cell media. This platform transcends the destructive nature of conventional transcriptomic analysis methods and reveals gene expression dynamics in complex biological systems in situ.
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FMI science @fmiscience.bsky.social · 01/09/2026
📣 Applications are now open for the FMI PhD and MD-PhD Programs! Train in a collaborative, international environment with cutting-edge technology, courses, scientific retreats and career-development opportunities — in Basel, a leading European life sciences hub. Apply at www.fmi.ch/education-ca...
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Kurianlab @kurianlab.bsky.social · 01/09/2026
www.biorxiv.org/content/10.6...
biorxiv.org
The human RNA-DNA interactome is cell type-specific and dynamic
More than twenty years ago, the FANTOM consortium uncovered that mammalian genomes are pervasively transcribed, revealing multitudes of RNAs with unknown functions. A subset of these transcripts has s...
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Philip Ball @philipcball.bsky.social · 30/08/2026
Earlier in the summer I suggested I’d do a thread on this gnarly paper. Better late than never. (Yes, it's more WTF biology.) 🧵 /1 www.nature.com/articles/s41...
nature.com
Subnuclear genome compartmentalization controls bivalent chromatin activity - Nature
Knowledge of the spatial location of a gene is necessary to understand its epigenomic regulation.
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Itai Yanai @itaiyanai.bsky.social · 31/08/2026
Advice for new PhD students: choose a mentor who is committed to your training, not just your project. The most important product of your PhD - even more important than the science - is YOU, a newly trained scientist.
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Molecular Cell @cp-molcell.bsky.social · 29/08/2026
Online Now: Oriented binding of transcription factors to nucleosomes remodels chromatin at human promoters Online now:
dlvr.it
Oriented binding of transcription factors to nucleosomes remodels chromatin at human promoters
Transcription factors (TFs) differ in their ability to interact with nucleosomes, and most TFs need other TFs to locate their motifs in the human genome. Here, Xiao et al. show that two ELF2 proteins are able to unwind DNA from nucleosomes and access all of their motifs in the genome.
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Mann Lab @mannlab.bsky.social · 27/08/2026
Same single cell, two modalities—both at depth. We digest protein first, run Smart-seq3xpress + C18 (Evotip) separation: peptides captured, cDNA in flowthrough. In HeLa & stem cells, proteome tracks cell state; RNA variance flags transitioning cells. www.biorxiv.org/content/10.6...
biorxiv.org
In the same cell, the proteome defines cellular state and the transcriptome marks transitions
Bulk transcriptome and proteome correlate only modestly, but this has not been investigated in the same cell or across cell-state changes. Here we introduce a scalable technology that quantifies thous...
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Nature Cell Biology @natcellbio.nature.com · 26/08/2026
☕Lebrec, @zierlab.bsky.social & co present a FRET-based cGAS reporter and show that cGAS activation by genotoxic stress is rare and uncoupled from micronuclei. The study implicates R-loop structures and subtypes of chromatin bridges as potential cGAS activators. www.nature.com/articles/s41...
nature.com
A versatile cGAMP reporter reveals principles of cGAS activation by DNA damage and chromosome instability - Nature Cell Biology
Lebrec et al. present a FRET-based cGAS reporter and show that cGAS activation by genotoxic stress is rare and uncoupled from micronuclei. The study implicates R-loop structures and subtypes of chroma...
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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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Itai Yanai @itaiyanai.bsky.social · 24/08/2026
We just sold out this one, but let us know where we should set up the next ‘train the trainer’ event for teaching the creative scientific process! night-science.org/train-the-tr...
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Nicolas Manel Lab @manellab.bsky.social · 24/08/2026
Exciting new publication from the Zierhut lab. Among the many cool things they found already with the reporter: Activating cGAS ≠activating STING, with regards to intercellular signaling dynamics. This has far reaching implications for cancer immunotherapy.
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