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James Gahan

@jgahan.bsky.social
1.2K followers 689 following 122 posts

Associate Professor and ERC Starting Awardee at University of Galway! I work on early animal evolution with a particular interest in gene regulation and chromatin! gahanlab.com chromosome.ie/groups/gahan 🏳️‍🌈🇮🇪 He/Him

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Reposted by James Gahan
Al-Sady lab @al-sadylab.bsky.social · 13/10/2026
Took us a bit, but this really special journey is now out, and much improved. Kudos to @agnisrota.bsky.social. It was wonderful to have had to privilege to co-advise you. A showcase of the power of collaboration - a thrill to have worked together on another story with @thebraunlab.bsky.social.
nature.com
Discrete subdomains establish epigenetic diversity in subtelomeric heterochromatin in fission yeast - Nature Communications
Here the authors show that subtelomeric heterochromatin in S. pombe forms a mosaic of subdomains with distinct requirements for gene silencing and different epigenetic stability, ranging from highly f...
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Pawel Burkhardt @pawelburkhardt.bsky.social · 13/10/2026
Can a comb jelly choose whether to reproduce as a larva or grow up first? 🪼 Our new preprint shows that in Mnemiopsis leidyi, this depends on the density of other comb jellies. A story of surprising developmental plasticity! www.biorxiv.org/content/10.6... 🧵 1/4 📸 @beziostudio.bsky.social
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Alex de Mendoza @alexdemendoza.bsky.social · 12/10/2026
How can a #GiantVirus 👾 lurk inside the host genome undetected? We find that epigenetic conflict lies at the centre of the ⚖️ between infection and co-existence with the host. Great collaboration with the Aylward lab out in @biorxivpreprint.bsky.social: www.biorxiv.org/content/10.6...
biorxiv.org
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Prof Gavin Yamey MD MPH @gavinyamey.bsky.social · 09/10/2026
Holy shit FOUR members of the ethics committee in Denmark that gave the green light to allow the widely-condemned RFK Jr-funded trial to proceed in Guinea-Bissau have now resigned in protest This quote is 🔥 Great reporting by @melodyschreiber.com www.theguardian.com/society/2026...
Stig Børsen Hansen, a founding member who was one of two reviewers who presented the study to the Danish committee, resigned from the group in protest on Friday, citing major ethical issues with the study.

“You are now enrolling newborns in a lottery to test a hypothesis,” Hansen said. The children who are randomly selected not to receive the birth dose of the vaccine, those who “lost the lottery”, face in their earliest days the risk of contracting hepatitis B, which can cause irreversible lifelong damage. “They contract hepatitis B in the context of being part of a research project,” Hansen said, which made their infection happen, in effect, “by design”.

Three other members of the committee have also resigned in protest.
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Itai Yanai @itaiyanai.bsky.social · 10/10/2026
1. CRISPR came from basic research on bacteria. 2. Optogenetics started with a discovery in algae. 3. The GFP protein comes from jellyfish. The biggest breakthroughs all trace to scientists following their curiosity, and this is one huge reason why we must keep funding basic research!
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Pawel Burkhardt @pawelburkhardt.bsky.social · 07/10/2026
From bioRxiv to PNAS! 🎉 Very happy to see our paper “Diversity and spatial segregation of TRP channels in the closest relatives of animals” now published in @pnas.org. Another piece in the puzzle of how animal cell signalling evolved. www.pnas.org/doi/10.1073/...
pnas.org
PNAS
Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans...
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James Gahan @jgahan.bsky.social · 07/10/2026
Really looking forward to digging into this!
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James Gahan @jgahan.bsky.social · 06/10/2026
I already cant wait for this meeting !
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Nobel Prize @nobelprize.org · 05/10/2026
Peter Hegemann and Georg Nagel – awarded the 2026 medicine prize – discovered a remarkable protein, channelrhodopsin, in a single-celled alga. Hegemann wondered how Chlamydomonas, a single-celled alga, is able to swim towards a light source.
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Çağrı Çevrim @cagricevrim.bsky.social · 01/10/2026
Your favorite website for illustrations of almost all organisms is looking for donations to help cover its running costs! Please consider donating to help keep this open-source platform running: www.phylopic.org/images
phylopic.org
All Silhouette Images on PhyloPic
Browse all the free silhouette images in PhyloPic.
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James Gahan @jgahan.bsky.social · 30/09/2026
I’m sure @nucleosomepolice.bsky.social will have something to say about those nucleosomes 🤣
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Rob Klose @robklose.bsky.social · 30/09/2026
Come join us April 2027 for the next instalment of the EMBL Chromatin and Epigenetics meeting. Great invited speakers and lots of talks selected from abstracts! It will be a fantastic meeting (despite the egregious nucleosome images...)
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Epigenetics Podcast @epigeneticspod.bsky.social · 28/09/2026
In the most recent episode we speak with @robklose.bsky.social, Professor of Genetics at the University of Oxford, about how CpG islands help control gene expression and chromatin regulation during development. #podcast #epigenetics Listen here: activemotif.com/podcasts-rob...
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Emma R Andersson @anderssonlab.bsky.social · 23/09/2026
🧬 Preprint! 🧵 Our goal is to genetically manipulate every embryonic germ layer to enable high throughput in vivo studies. We previously showed mouse ectoderm can be targeted by amniotic injection, enabling cell-specific manipulation, lineage tracing, and knockouts. But how to reach mesoderm?
Schematic of method developed and application. At embryonic day 7.5, a lentiviral library carrying unique 30-nucleotide barcodes and a fluorescent reporter is injected into the mouse exocoelomic cavity. An E8 embryo cross-section shows that this cavity is continuous with the intraembryonic coelomic cavity, allowing the virus to reach and barcode mesodermal progenitors, including lateral plate and paraxial mesoderm.
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Sue Biggins @suebiggins.bsky.social · 21/09/2026
Here it is! @basicsci.fredhutch.org is searching for an associate or senior faculty member!
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Buzz Baum @buzzbaum.bsky.social · 22/09/2026
We are looking for a research assistant! Come join the team: www.jobs.ac.uk/job/DSZ826/r...
jobs.ac.uk
Research Support Officer | Cell Biology | Dr Buzz Baum | LMB 2904 at MRC Laboratory of Molecular Biology
Start your UK & international job search for academic jobs, research jobs, science jobs and managerial jobs in leading universities and top...
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Thibaut Brunet @thibautbrunet.bsky.social · 02/09/2026
🚨 New preprint alert! 🚨 Choanoflagellates reorganize their global cytoskeletal architecture within seconds to explore confined microspaces. This is the main PhD work of the amazing @maitefreired.bsky.social www.biorxiv.org/content/10.6... A tread 🧵⬇️
biorxiv.org
Rapid repurposing of microvillar content drives a flagellate-to-amoeboid switch in the closest relative of animals
Animal cells extensively remodel their cytoskeleton during differentiation and can notably switch between two major motility modes: flagellum-based swimming and actin-based crawling. We previously sho...
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Cnidarian developmental mechanisms group @clytia-vlfr.bsky.social · 19/09/2026
Evidence collected by successive lab members over many years that neural cells in the Clytia larva have two origins: From 'i-cells' located in endoderm and by delamination of the gastrula ectoderm. doi.org/10.1242/dev.... @biodev-vlfr.bsky.social @annaferraioli.bsky.social
The two proposed neurogenesis pathways during Clytia larval development
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Will Ratcliff @wcratcliff.bsky.social · 15/09/2026
1/17 Submissions are now open for the 2027 Microbial Population Biology GRC! We expect this meeting to be extraordinarily oversubscribed. If you want to come, time is of the essence--apply ASAP! June 27–July 2 • Andover, NH www.grc.org/microbial-po...
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Teresa Rayon @trayon.bsky.social · 12/09/2026
‼️ Postdoc position open. We study how protein metabolism controls time. If you’re excited by this question, we’d love to hear from you! We’re looking for a motivated & collaborative researcher with a strong track record. 📅 30 September 2026 📢 Please share Apply here 👇👇
babraham.current-vacancies.com
Postdoctoral Research Scientist - Babraham
The lab investigates the molecular mechanisms that control biological timing in mouse and human stem cells (Azzi & Rayon, Curr Opinions 2024; Nakanoh et al., Dev Cell 2026). The central aim of this ex...
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Marc A. Marti-Renom @mamartirenom.bsky.social · 03/09/2026
Latest preprint from the lab… what could be better than good science with good friends? 😊 @agneseloda.bsky.social @antonia-hauth.bsky.social @encent.bsky.social @heard65.bsky.social @heardlab.bsky.social www.biorxiv.org/content/10.6...
biorxiv.org
X-inactivation escapee domains are CTCF-cohesin independent chromatin compartments
X-chromosome inactivation involves chromosome-wide gene silencing accompanied by extensive chromatin changes, as well the loss of topologically associating domains. Yet discrete regions of the inactiv...
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James Gahan @jgahan.bsky.social · 03/09/2026
Congratulations!
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James Gahan @jgahan.bsky.social · 03/09/2026
Congratulations to all the awardees, its a great achievement. Unfortunate to see Ireland continue to under-perform compared to our potential but @researchireland.ie have unfortunately decided that short-term gains trump a more long-term strategy which could make Ireland a real research powerhouse.
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Nature @nature.com · 30/08/2026
Dolly Parton was an advocate for vaccines, public health, literacy and marginalized communities go.nature.com/4gwB0wA
go.nature.com
Dolly Parton dies aged 80 – researchers celebrate her contributions to science
Nature - The country singer was an advocate for vaccines, public health, literacy and marginalized communities.
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Peter Andersen @germline.bsky.social · 29/08/2026
We watched piRNAs and transposons across development, saw them dance tightly and wrote a paper about it. It's so cool to see it online and we will make a thread about it all very soon. Stay tuned :-)
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EMBL Australia @emblaustralia.org · 28/08/2026
Ready to take the next step in your research career? 👨‍🔬 We're seeking an outstanding researcher to establish an independent research program as an EMBL Australia Group Leader at the Australian Regenerative Medicine Institute (ARMI) @monashuniversity.bsky.social 🗓️ Apply by 2 October 🔗 bit.ly/4qHYtjb
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Tobias Warnecke @tobiaswarnecke.bsky.social · 22/08/2026
Who needs chromatin anyway...? NOT THIS GUY! www.biorxiv.org/content/10.6... 1/n
biorxiv.org
Chromatin is dispensable for bacterial life
Inside cells, DNA is intimately associated with proteins, forming chromatin. The protein constituents of chromatin vary across the tree of life: histones are the principal building blocks of chromatin...
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Levayer Lab @levayerr.bsky.social · 20/08/2026
This 👇, and Europe should also have more scheme to finance those essential "infrastructures" (rathen than implementing 10 millions single person grant...) www.nature.com/articles/d41...
nature.com
Treat biological databases as infrastructure, not projects
Letter to the Editor
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Darrin T. Schultz @dts.bsky.social · 19/08/2026
I'm thrilled to share that I've started as an Assistant Professor in Biological Sciences and the Oceans Research Center at Lehigh University! I'm building a group in evolutionary genomics to study the origin of animals, and to use those concepts to better understand human disease. More: evogeno.me
Darrin Schultz, a man with curly dark hair and tortoiseshell glasses, smiling at the camera in a brown blazer over a blue patterned shirt with sunglasses hooked on the collar, standing in front of a stone wall.
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Darrin T. Schultz @dts.bsky.social · 19/08/2026
Our new paper in Science Advances asks how animals' genomes have changed since their origin from a common ancestor over 600 million years ago, and what patterns in their DNA have arisen in the churn of speciation and extinction. www.science.org/doi/10.1126/...
Five-panel diagram explaining fusion-with-mixing in chromosome evolution. Red and blue represent two different ancestral chromosomes throughout.

A, Fusion-with-mixing: a red chromosome and a blue chromosome fuse into one half-red, half-blue bar. Down the page, successive rows show inversions, drawn as X-shaped crossings between rows, progressively interleaving the two colors until the bottom bar is finely striped. A widening gray wedge labeled Entropy runs alongside an arrow marked Time plus evolution, pointing down.

B, Independent regulation: two separate chromosomes, one red and one blue. In each, a regulatory element, drawn as an oval, acts by an arrow on a gene within its own chromosome only.

C, FWM and novel regulation: on a fused, mixed chromosome, a red gene and a blue gene now sit next to each other across an inversion breakpoint. Red and blue arrows show regulatory elements reaching across it to act on the other chromosome's gene.

D, Regulatory entanglement: an extensively mixed chromosome, finely striped. Below it, a row of alternating red and blue genes is linked by a dense web of crossing curved arrows, so many overlapping regulatory connections that unmixing the chromosome would break them.

E, Emergence of entangled loci: a five-species phylogeny. A red and a blue chromosome fuse at an ancestral node, and helical icons on later branches mark continued mixing. Colored boxes mark four new red-blue regulatory interactions arising after inversions. Species A keeps its two chromosomes separate. In species B through E, the two earliest interactions, cyan boxes 1 and 2, are present in every descendant lineage, while later ones, yellow 3 and magenta 4, appear in fewer.
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Luis Alberto Bezares Calderón @lbezarescalderon.bsky.social · 16/08/2026
Our team is recruiting a PhD student to investigate the evolution of pressure sensation in Zooplankton! The project will use marine invertebrate larvae to explore the molecular, cellular, and neuronal mechanisms behind this fascinating sensory system. More details here: bit.ly/3TTeF4Q
bit.ly
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Ctenophores Rock! @ctenophoresrock.bsky.social · 16/08/2026
If you'd like to learn more about reverse development in Mnemiopsis leidyi, check out @the-node.bsky.social post by @joanjsoto.bsky.social & @pawelburkhardt.bsky.social on their documented discovery: thenode.biologists.com/reverse-deve... 🦑
thenode.biologists.com
Reverse development in the ctenophore Mnemiopsis leidyi - the Node
Joan and Pawel show us a timelapse video of reverse development of the ctenophore Mnemiopsis leidyi, and tell the story behind it.
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Teresa Rayon @trayon.bsky.social · 15/08/2026
Our work on the role of the proteasome in developmental tempo is out!!!! 🐭⌛️👤⏳ Six years after identifying an association between protein stability and developmental tempo, we now demonstrate a causal link between protein turnover and developmental tempo through proteasomal degradation
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Arnau Sebé-Pedrós @arnausebe.bsky.social · 03/08/2026
Happy to share the final version of our study on the evolution of chromatin states across eukaryotes, out today in @natgenet.nature.com Led by @crisnava.bsky.social and @seanamontgomery.bsky.social www.nature.com/articles/s41... Some highlights below
nature.com
Diversity and evolution of chromatin regulatory states across eukaryotes - Nature Genetics
This study introduces iChIP2, a low-input chromatin immunoprecipitation followed by sequencing method that profiles histone post-translational modifications (hPTMs) simultaneously across diverse eukar...
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bioRxiv Evolutionary Biology @biorxiv-evobio.bsky.social · 31/07/2026
Evolution of a genome-architecture-encoded gene regulation system in trypanosomatids www.biorxiv.org/content/10.64898/20…
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jpgerdt.bsky.social @jpgerdt.bsky.social · 24/07/2026
Ruibao's first paper from the lab is out in @nature.com . www.nature.com/articles/s41.... Collab with @multicellgenome.bsky.social & @jennahed.bsky.social. How did cells stick together and form the first animals? The protist Ministeria suggests cellular aggregation had a role. @iuqcb.bsky.social
nature.com
A unicellular relative links aggregative multicellularity to animal origins - Nature
Aggregative multicellularity was key to the evolution of the multicellular animal genetic toolkit.
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Ferenc Mueller @ferencmueller.bsky.social · 21/07/2026
Join us in Budapest in October! There is still time to register with an abstract. Talk and flash talk slots, a great speaker line up at an informal meeting on epigenetics, gene and genome regulation etc. in a beautiful city. shorturl.at/fOuCZ. For that to do list before the holidays!
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Eric Conway @conwayer1.bsky.social · 27/07/2026
Preprint alert! 🚨 We are very excited to share our new manuscript on Bohring-Opitz syndrome, a devastating rare monogenic disorder driven by truncating variants in ASXL1. This project was led by PhD student Emma Doyle, one of the OG Conway lab members 💪. 1/6 www.biorxiv.org/content/10.6...
biorxiv.org
Divergent Pathogenic PR-DUB Complex Variants Converge Functionally Via PRC2 Displacement From Chromatin
The PR-DUB complex is responsible for erasing the repressive histone modification, H2AK119ub1. ASXL1-3 proteins are mutually exclusive catalytic partners of BAP1 in the PR-DUB complex. Somatic heteroz...
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bioRxivpreprint @biorxivpreprint.bsky.social · 27/07/2026
Transcription-dependent heterochromatin at the Xist promoter shapes the random choice of the inactive X chromosome www.biorxiv.org/content/10.64898/20…
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Jonathan W. Gray @elmcitytree.blacksky.app · 18/07/2026
This is Lamine Yamal the 19 year old star of the Spanish National team & FC Barcelona. He did this in May at the parade when Barca won the league. In case you’re not sure whom to root for tomorrow. ⚽️
Lamine Yamal in May at the parade after Barcelona won the league title. Children are the future.
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Mathieu M.J.E. Rebeaud @chercheurjuteux.com · 11/07/2026
The Origin of Life in the Light of Evolution Another food for thought paper with @lauraeme.bsky.social and a lot of fantastic scientists. arxiv.org/abs/2605.05464
arxiv.org
The Origin of Life in the Light of Evolution
The origin of life is often framed primarily as a chemical problem, yet life's defining feature is evolution. Advances in geochemistry, prebiotic chemistry, and molecular biology have produced diverse...
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Sergio Menchero @sermenchero.bsky.social · 08/07/2026
The 2nd part of my postdoc is now out as a preprint! A challenging but fulfilling team effort to perform genome editing in opossums. We found that the lncRNA RSX is essential to initiate X-inactivation in marsupials 🦘 A long-standing question since the discovery that Xist is absent in marsupials 👇
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Fabian Rentzsch @fabianrentzsch.bsky.social · 08/07/2026
Beautiful work on the establishment of symbiosis in anthozoans. www.cell.com/cell/fulltex... And a good opportunity to re-read an exciting related paper from last year. www.cell.com/cell/fulltex...
cell.com
Co-option of lysosomal machinery shapes the evolution of the intracellular photosymbiosis supporting coral reefs
Corals harbor intracellular algal symbionts in specialized organelles that enable them to build diverse reef ecosystems. Corals and other cnidarians have repeatedly evolved this symbiosis through the ...
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International Society for Regenerative Biology @isrbio.bsky.social · 07/07/2026
⏰ One week to go! ISRB Webinar | Zone 2 (Europe, West Asia, Africa): 🗓 July 14, 2026 at 16:00 Europe/Berlin 🎤 Eric Röttinger, PhD 🎤 Ulrich Technau More info: isrbio.org/webinars
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Chung Hyun Cho @chc-evobio.bsky.social · 04/07/2026
Excited to share our new preprint led by Fred and me in collaboration with the archaeal community! We found that the molecular foundation of histone-based chromatin has pre-eukaryotic roots in Asgard archaea. (1/4) #ArchaeaSky www.biorxiv.org/content/10.6...
biorxiv.org
Emergence of histone-based chromatin complexity in Asgard archaea
The emergence of the eukaryotes coincided with the diversification of histone proteins and their post-translational modifications by enzymes that constitute the core of eukaryotic chromatin. Yet the e...
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bioRxiv Evolutionary Biology @biorxiv-evobio.bsky.social · 28/06/2026
Minicollagen expression dynamics reveal a transcriptional program for cnidogenesis in the sea anemone Nematostella vectensis www.biorxiv.org/content/10.64898/20…
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Kresten Lindorff-Larsen @lindorfflarsen.bsky.social · 23/06/2026
Come join the new Novo Nordisk Foundation Center for Protein Design as a group leader Cool science in a great scientific environment in wonderful and very family friendly Copenhagen There are two positions that can either be at TT assistant or associate prof level employment.ku.dk/tenure-track...
employment.ku.dk
Tenure-track Assistant Professor or Associate Professor of De novo Protein Design
The Novo Nordisk Foundation Center for Protein Design at the University of Copenhagen seeks to appoint two new group leaders in de novo protein design from 1 February 2027 or as soon as possible thereafter. These positions will be at the Assistant or Associate Professor level and associated with the Department of Biology (Faculty of Science) or the Department of Drug Design and Pharmacology (Faculty of Health and Medical Sciences).
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Harmit Singh Malik @harmitmalik.bsky.social · 24/06/2026
I know it seems like a heretical idea, but one way to figure out if a preprint is really interesting (to you) is... to read the preprint. Then, in the spirit of sharing, send a note to authors: a simple kudos or a more detailed question. I do this a dozen times a year. It's awesome. Try it.
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James Gahan @jgahan.bsky.social · 24/06/2026
What’s the answer to “What’s worse that impact factor”…Id argue that letting AI rank papers and picking the top 1% would be a fine answer!
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James Gahan @jgahan.bsky.social · 24/06/2026
This 100%, I’d I have a preprint out then getting an email from someone who ready it would make my day!
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