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Erwan Gueguen

@macerwan.bsky.social
280 followers 216 following 35 posts

Molecular microbiology assistant-professor at University of Lyon. I tweet only about Science here. I work on Pectobacteriaceae. I don't like bacteria that can't be genetically manipulated. Lab website: sites.google.com/view/mtsb

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Erwan Gueguen @macerwan.bsky.social · 30/09/2026
New preprint on bioRxiv from my lab: How can a single bacterial sRNA coordinate very different competitive strategies? We show that ArcZ acts as a regulatory hub controlling both antibacterial and antifungal activities in Dickeya solani. #T6SS #secondarymetabolites #microsky
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Sholto David @sholtodavid.bsky.social · 17/05/2026
Surprised to discover that Thermo Fisher appears to show a fake western blot for the validation of one of their p53 antibodies. I've added a diagram to show the very similar bands. This does not appear to be one of the "published figures" but their own internal data.
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Erwan Gueguen @macerwan.bsky.social · 27/06/2026
www.science.org/doi/10.1126/
science.org
Antibiotics stimulate protein transfer to persister cells
The exchange of biological matter between bacterial cells drives adaptation and evolution. However, whether bacteria can exchange functional proteins remains unclear. In this work, we found that antib...
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Erwan Gueguen @macerwan.bsky.social · 19/05/2026
🧬 The kick-off meeting of the Erasmus+ Blended Intensive Programme “Microbes in Focus” took place on May 18th, 2026, with all selected students attending. This international programme focuses on modern molecular microbiology, microbial genetics, and the study of microorganisms. 🧵👇
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Erwan Gueguen @macerwan.bsky.social · 26/01/2026
MSCA Postdoctoral Fellowship 2026 opportunity. Join my team at Lyon 1 University Claude Bernard to study functional genetics of plant pathogens. Full details are available in the attached document. Internal Deadline: June 15, 2026
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Erwan Gueguen @macerwan.bsky.social · 21/01/2026
I find something amiss with this figure depicting the GAC system network in Pseudomonas aeruginosa published here: journals.asm.org/doi/10.1128/... Should the RsmA binding sites be represented as a double-stranded helix? 🤔 It’s confusing about what this protein actually does. Don't you think ?
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Erwan Gueguen @macerwan.bsky.social · 15/01/2026
Nous recrutons un Maître ou une Maîtresse de conférences en bactériologie moléculaire pour notre équipe MTSB au laboratoire MAP à Lyon, France. Le poste combine recherche sur l'adaptation des bactéries phytopathogènes et enseignement en génétique microbienne. Notre team : sites.google.com/view/mtsb
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Erwan Gueguen @macerwan.bsky.social · 22/12/2025
New pub. from the lab ! We discovered that potato tubers exert intense selective pressure during Dickeya solani infection, driving the rapid emergence of mutations in the sRNA ArcZ. These mutations lead to the appearance of "social cheaters" that sweep through the pop. in as few as 30 generations.
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Nature Microbiology @natmicrobiol.nature.com · 19/12/2025
Microbes weaponizing secondary metabolites to make rivals vulnerable to phage attack 🧪🦠 www.nature.com/articles/s41...
nature.com
Streptomyces secretes a siderophore that sensitizes competitor bacteria to phage infection - Nature Microbiology
A secondary metabolite sensitizes competitor Bacillus subtilis to a wide panel of lytic phages by sequestering iron and preventing the activation of Spo0A.
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Institut Pasteur | 130 years of biomedical research @pasteur.fr · 17/12/2025
🏆 Institut Pasteur Canetti Prize 2025 awarded to Céline Loot for her innovative contributions to infectious disease research. This annual Institut Pasteur prize (€15K) honors scientific excellence, funded by the Canetti family legacy. Congratulations Céline 👏
Institut Pasteur Canetti Prize 2025 awarded to Céline Loot for her innovative contributions to infectious disease research. ©Institut Pasteur©Institut Pasteur
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Emmanuele Severi @emmseveri.bsky.social · 02/11/2025
#mycrosky #synbio www.biorxiv.org/content/10.1...
biorxiv.org
Adapting CRISPR-associated transposons for rapid and high-throughput reverse genetics
CRISPR-associated transposons (CAST) use guide RNAs to direct their transposition and are being harnessed as tools for programmable genome engineering across diverse bacterial species. However, CAST s...
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Stephen Turner @stephenturner.us · 10/10/2025
Lost Science is a new NYT series of accounts from scientists who have lost their jobs or funding. You can send your story to the Times here www.nytimes.com/2025/10/08/c...
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Sergi Arredondo-Alonso @arredondo.bsky.social · 16/10/2023
Have you wondered if some E. clones are so successful because of their plasmids? www.biorxiv.org/content/10.1... A combination of bioinf and lab work showed that some plasmids have coexisted for centuries, and that a specific colicin gene is able to kill other clones paving their way for success!
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Genetics Society of America @genetics-gsa.bsky.social · 07/10/2025
How do spontaneous mutations arise? In this latest #GENETICS review, Susan Lovett and @thalia.bsky.social provide a detailed overview of bacterial genetics experiments instrumental in understanding how genomes change. buff.ly/CXJnTqn
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Emmanuele Severi @emmseveri.bsky.social · 08/10/2025
www.biorxiv.org/content/10.1... #microsky
biorxiv.org
Pseudomonas aeruginosa lasR is a keystone gene in polymicrobial cultures
The airways of people with cystic fibrosis (CF) are often co-infected by Pseudomonas aeruginosa and a variety of other co-habiting microbes; the infections are polymicrobial. P. aeruginosa isolates fr...
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Emmanuele Severi @emmseveri.bsky.social · 10/10/2025
www.science.org/doi/10.1126/... #microsky #microbiome DGRs FTW
science.org
Targeted protein evolution in the gut microbiome by diversity-generating retroelements
Diversity-generating retroelements (DGRs) accelerate evolution by rapidly diversifying variable proteins. The human gastrointestinal microbiota harbors the greatest density of DGRs known in nature, su...
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AnniZLab: [🦠, 🧬 , ✨] @annizlab.bsky.social · 10/10/2025
Quite an interesting protein search AI model combining sequence, structure, and function text - faster and more accurate than similarity searches. Who has tried it🤩🙌? Only a few secs to search bacterial TFs and integrases #microsky 🧬🧪 www.nature.com/articles/s41...
nature.com
A trimodal protein language model enables advanced protein searches - Nature Biotechnology
A protein foundation model represents protein sequence, structure and function.
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Emmanuele Severi @emmseveri.bsky.social · 15/09/2025
www.nature.com/articles/s41... #microsky #genomics #phagesky #phage defense
nature.com
De novo discovery of conserved gene clusters in microbial genomes with Spacedust - Nature Methods
This work presents Spacedust, a tool for de novo identification of conserved gene clusters from metagenomic data.
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CNRS Biologie @cnrsbiologie.bsky.social · 04/09/2025
#ResultatScientifique🔎| Des scientifiques ont révélé comment le plasmide pOXA-48 rend les bactéries ultra-résistantes aux antibiotiques 🦠 🤝 @cnrs.fr @mmsb-lyon.bsky.social @cnrs-rhoneauvergne.bsky.social ✍️ @sbigot.bsky.social 📕 @natcomms.nature.com | buff.ly/u3Cy4Db
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Carl T. Bergstrom @carlbergstrom.com · 16/07/2025
1. Kevin Gross and I just posted a new science-of-science preprint. This one explores the looming peer review crisis. As many of you know, it's becoming significantly more difficult for journal editors to find scholars willing to serve as peer reviewers for submitted manuscripts.
arxiv.org
Will anyone review this paper? Screening, sorting, and the feedback cycles that imperil peer review
Scholarly publishing relies on peer review to identify the best science. Yet finding willing and qualified reviewers to evaluate manuscripts has become an increasingly challenging task, possibly even ...
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Ákos T Kovács @evolvedbiofilm.bsky.social · 12/07/2025
A bacterial host factor confines phage localization for excluding the infected compartment through cell division @cp-cellreports.bsky.social from Sigal Ben-Yehuda www.sciencedirect.com/science/arti...
sciencedirect.com
A bacterial host factor confines phage localization for excluding the infected compartment through cell division
Viruses frequently induce the formation of specialized subcellular compartments to facilitate their replication and assembly. Here, we describe a “hos…
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Microsoft Research @msftresearch.bsky.social · 10/07/2025
Today in the journal Science: BioEmu from Microsoft Research AI for Science. This generative deep learning method emulates protein equilibrium ensembles – key for understanding protein function at scale. www.science.org/doi/10.1126/...
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CNRS Écologie & Environnement @cnrsecologie.bsky.social · 09/07/2025
@cnrsecologie.bsky.social regrette profondément l'adoption de cette loi à la vision court-termiste & ses conséquences graves sur l’environnement, qui méprise santé & bien-être de la population & le rôle des espèces sauvages dans la prod. agricole. La communauté scientifique n'a pas été entendue.
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Jerónimo Rodríguez-Beltrán @jerorb.bsky.social · 02/07/2025
🚨🚨New paper out in @natcomms.nature.com!! Come for the first large-scale analysis of plasmid copy number across species, stay for one of the most intriguing results of my lab: universal scaling laws in plasmid biology! 📈🧬 👉 www.nature.com/articles/s41...
nature.com
Universal rules govern plasmid copy number - Nature Communications
Plasmids exhibit a broad range of sizes and copies per cell, and these two parameters appear to be negatively correlated. Here, Ramiro-Martínez et al. analyse the copy number of thousands of diverse b...
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Olivier Borkowski @oborkowski.bsky.social · 08/07/2025
Harnessing Small RNAs as Synthetic Post-transcriptional Regulators in Bacteria pubs.acs.org/doi/10.1021/...
pubs.acs.org
Harnessing Small RNAs as Synthetic Post-transcriptional Regulators in Bacteria
Bacteria can respond to environmental changes by expressing small RNAs (sRNAs), which regulate mRNAs by complementary base-pairing. This regulatory mechanism allows bacteria to rapidly adapt their proteome. In recent years, sRNAs have gained attention as blueprints for synthetic regulators allowing control over user-defined targets. Multiple aspects need to be considered for efficient application of these versatile, on-demand, and easy-to-use tools. Advances in computational prediction and bioengineering concepts are the dawn of systematic synthetic sRNA biology. We provide an overview of sRNAs and alternative post-transcriptional regulators, highlight the requirements for successful regulation, and provide guidelines for design, construction, and sRNA application.
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ASM @asm.org · 12/06/2025
Researchers uncover a new class of retropepsin-like proteases in P. aeruginosa that are required for biofilm formation & bacterial survival under stress conditions, including antibiotic exposure, making them appealing therapeutic targets. #mBio: asm.social/2sq
Phenotypic characterization of RloA protease mutants in Pseudomonas aeruginosa. (A) Biofilm formation in PA14 wild type and ∆rloA1-3 mutants was assessed through crystal violet staining of overnight cultures grown in 0.4% Arginine M63 media (top). Graph shows the normalized average intensity of crystal violet staining (OD550) relative to the growth of the corresponding bacterial culture (OD600), n = 4. Error bars show standard deviation. (B) PA14 wild-type and ∆rloA1-3 mutant colonies were grown in Congo red 0.2% glucose M63 agar. Scale bar represents 2 mm. (C) Ampicillin ETEST strips tested on lawns of PA14 wild-type and ∆rloA1-3 mutant strains grown on Mueller-Hinton agar. Graph shows the average minimal inhibitory concentration (MIC) from triplicate experiments. Error bars show standard deviation. (D) Scanning electron micrographs of PA14 wild-type (top) and ∆rloA1-3 mutant cells (bottom). Scale bar represents 4 µm.
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Matt Doyle @doylemt1.bsky.social · 06/07/2025
Check out these amazing lipid-monolayer-trapping oligomeric OMPs published by @lalouxlab.bsky.social and Lovering Labs. The BAM complex in these bugs must be wild! www.nature.com/articles/s41...
nature.com
A porin-like protein used by bacterial predators defines a wider lipid-trapping superfamily - Nature Communications
This study reveals that an outer membrane protein from the predator Bdellovibrio bacteriovorus forms a pentameric assembly that traps a lipid monolayer within. This allows the discovery of two superfa...
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Erin J. Wamsley 🧠📈😴 @wamsleylab.bsky.social · 03/07/2025
Where is the money going? In the case of for-profit publishers it's very clear: Your open access fees fund corporate profit margins. Profit margins for large academic publishers can far exceed those of household names like Amazon and Apple. chart source: bit.ly/4leULKi #scipub #academicsky
Chart shows profit margin for Elsevier is 38%, for Springer-Nature is 27%... this is in comparison to companies like Apple (25%), Amazon (5%)... There are non-publishing companies like Microsoft with big margins (34%), but overall the chart shows that academic publishing companies have surprisingly large profits when compared to more "famous" large companies that are household names. "Source" line says "yahoo finance, RELX investor presentations, Spring Nature Annual Reports
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Erwan Gueguen @macerwan.bsky.social · 27/05/2025
I am delighted to be taking part in the 8th meeting on RNA regulation in bacteria and archaea, to be held in Strasbourg from September 1-4. This is my first time, and I'm really looking forward to meeting the experts on this topic. microbialrnameeting.com #MicrobialRNAs
microbialrnameeting.com
Microbes & RNA 2025 – 8th Meeting on Regulating with RNA in Bacteria and Archaea
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Nature Portfolio @natureportfolio.nature.com · 21/05/2025
A paper in Nature presents an AI model that can outperform existing Earth system forecasts. The model, named Aurora, could enable more accurate and efficient forecasting of air quality, tropical cyclone paths, and ocean wave dynamics, as well as high-resolution weather forecasting. 🌊 ⚒️ 🧪
go.nature.com
A foundation model for the Earth system - Nature
Aurora, a new large-scale foundation model trained on more than one million hours of diverse geophysical data, outperforms operational forecasts in predicting air quality, ocean wave dynamics, tropical cyclone tracks and high-resolution weather.
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Molecular Microbiology @molmicrounihoh.bsky.social · 21/05/2025
🫴 Wow: A bacterial reverse transcriptase synthesizes long poly-A–rich cDNA for anti phage defense: 👇👇👇 @science.org www.science.org/doi/10.1126/...
science.org
Bacterial reverse transcriptase synthesizes long poly-A–rich cDNA for antiphage defense
Prokaryotic defense-associated reverse transcriptases (DRTs) were recently identified with antiviral functions; however, their functional mechanisms remain largely unexplored. Here we show that DRT9 f...
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Erwan Gueguen @macerwan.bsky.social · 21/05/2025
🎓 Looking for a postdoc with a background in bacteriology to join my team to study pectinolytic bacteria via a #MSCA fellowship 🇪🇺 (up to 3 yrs in France). 📅 Expression of interest by June 15. The MSCA application deadline is September 10, 2025. 🔗 Info in attached files #Pectobacteriaceae
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Erwan Gueguen @macerwan.bsky.social · 18/05/2025
www.jbc.org/article/S002...
jbc.org
Throwing a spotlight on genomic dark matter: the power and potential of transposon-insertion sequencing
Linking genotype to phenotype is a central goal in biology. In the microbiological field, transposon mutagenesis is a technique that has been widely used since the 1970’s to facilitate this connection...
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MMSB-Lyon @mmsb-lyon.bsky.social · 14/05/2025
Le MMSB propose une mobilité NOEMI Rejoignez l'équipe "Ecologie et Évolution Moléculaire des Phages" qui travaille sur les éléments génétiques mobiles et l'immunité bactérienne. Profil Génétique bactérienne, Écologie microbienne et Evolution expérimentale 🤝Contactez-nous pour rejoindre notre unité!
mmsb.cnrs.fr
MMSB – Molecular Microbiology and Structural Biochemistry
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David Bikard @dbikard.bsky.social · 14/05/2025
The US is literally losing its mind... killing valuable research programs, and more seriously, damaging what makes US science so strong: it's attractiveness for the best minds in the world.
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bioRxiv Bioinfo @biorxiv-bioinfo.bsky.social · 14/05/2025
SoftAlign: End-to-end protein structures alignment www.biorxiv.org/content/10.1101/202…
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Joachim Goedhart @joachimgoedhart.bsky.social · 12/05/2025
SimpleViz: A User-Friendly, Web-Based Tool for Publication-Ready Data Visualization in Bioinformatics www.sciencedirect.com/science/arti...
Fig. 1. Schematic diagrams that explain SimpleViz, web-based tool charting box/violin/dot plot, volcano plot, PCA plot, and heatmap.
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Erwan Gueguen @macerwan.bsky.social · 11/05/2025
With each passing day, the articles I read about the Trump administration's research policy plunge me into a deeper and deeper state of dismay. 1/3 www.forbes.com/sites/johndr...
forbes.com
The NSF Is Being Dismantled — With Broad Implications For The American Economy
The economic consequences of cuts to the National Science Foundation and restricting scientific inquiry on this scale could be far-reaching.
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Céline Loot @celineloot.bsky.social · 09/05/2025
At least 10% of the V. cholerae integron cassettes have novel antiphage activities (see below). Considering that there are 25,000 distinct cassettes of unknown function, integrons constitute an extraordinary and almost inexhaustible reservoir of antiphage functions!
science.org
Sedentary chromosomal integrons as biobanks of bacterial antiphage defense systems
Integrons are genetic systems that drive bacterial adaptation by acquiring, expressing, and shuffling gene cassettes. While mobile integrons are well known for spreading antibiotic resistance genes, t...
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Erwan Gueguen @macerwan.bsky.social · 01/05/2025
Our latest publication has just been released. As I am no longer working on this project, I can share the strains with any team wishing to continue it. It was fun but impossible to work on everything. #pseudomonas #putida enviromicro-journals.onlinelibrary.wiley.com/doi/10.1111/...
enviromicro-journals.onlinelibrary.wiley.com
High‐Throughput Tn‐Seq Screens Identify Both Known and Novel Pseudomonas putida KT2440 Genes Involved in Metal Tolerance
Exposure of Pseudomonas putida KT2440 to toxic metals activates genes PP_1663, PP_5002, PP_5337, and the two-component system RoxSR, possibly linked to membrane integrity, FeS cluster maintenance, an...
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Erwan Gueguen @macerwan.bsky.social · 09/04/2025
Submission open for the 8th Meeting on Regulating with RNA in Bacteria and Archaea, September 1 – 4, 2025, Strasbourg. microbialrnameeting.com
microbialrnameeting.com
Microbes & RNA 2025 – 8th Meeting on Regulating with RNA in Bacteria and Archaea
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T3SS @t3sss.bsky.social · 02/04/2025
Pseudomonas syringae subpopulations cooperate by coordinating flagellar and type III secretion spatiotemporal dynamics to facilitate plant infection www.nature.com/articles/s41...
nature.com
Pseudomonas syringae subpopulations cooperate by coordinating flagellar and type III secretion spatiotemporal dynamics to facilitate plant infection - Nature Microbiology
Single-cell gene expression analysis reveals phenotypic heterogeneity to enable bacterial specialization over the course of plant colonization.
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École Thématique de Microbiologie Moléculaire 2025 @etmm.bsky.social · 02/04/2025
Après 7️⃣ longues années d’absence, l’École Thématique de Microbiologie Moléculaire fait enfin son grand retour ! 🦠 On vous donne RDV : 📅 6-10 Octobre 2025 📍 Carry-Le-Rouet (13) 🇫🇷 🔗 lcb.cnrs.fr/etmm2025/
lcb.cnrs.fr
École Thématique de Microbiologie Moléculaire 2025 - LCB
L’ETMM vise à diffuser les nouveaux concepts et méthodologies en microbiologie en présentant des recherches de pointe inédites. Dans ce but, l’ETMM réunit des
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Erwan Gueguen @macerwan.bsky.social · 02/04/2025
"My usual advice to anyone thinking about a lab-based career in science is not to do it unless you can’t imagine not doing it. It is frequently all-consuming, you are never finished, and the outcomes are not always what we want. " 1/2
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Sophien Kamoun @kamounlab.bsky.social · 24/02/2025
Society journals vs. #NatureRipoffs @manavellalab @ASPB @NaturePlants
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Science Magazine @science.org · 18/02/2025
New research in Science represents a notable step forward in designing enzymes from scratch. With a new approach, researchers designed an enzyme that uses a covalent intermediate to catalyze a two-step reaction, analogous to what many proteases do when breaking apart proteins. scim.ag/41kZBOI
scim.ag
Computational design of serine hydrolases
The design of enzymes with complex active sites that mediate multistep reactions remains an outstanding challenge. With serine hydrolases as a model system, we combined the generative capabilities of ...
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Erwan Gueguen @macerwan.bsky.social · 12/02/2025
journals.plos.org/plosbiology/...
journals.plos.org
Widespread fungal–bacterial competition for magnesium lowers bacterial susceptibility to polymyxin antibiotics
Interactions between fungi and bacteria can both suppress and promote bacterial fitness. This study uncovers a widespread form of antagonism, in which fungi like Candida albicans sequester magnesium t...
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Alicia Pérez Lorente @aliciaperezlorente.bsky.social · 11/02/2025
Excited to share our latest preprint! A fascinating story of chemical dialogue and microbial warfare: the Bacillus extracellular matrix acts as a key driver in the antagonistic interaction with Botrytis, while the fungus mounts a multi-layered defense. 🔗 www.biorxiv.org/content/10.1...
biorxiv.org
The offensive role of the Bacillus extracellular matrix in driving metabolite-mediated dialogue and adaptive strategies with pathogenic fungi
Bacterial□fungal interactions have traditionally been attributed to secondary metabolites, but the role of the bacterial extracellular matrix (ECM) in shaping these relationships has remained unclear....
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Ákos T Kovács @evolvedbiofilm.bsky.social · 10/02/2025
ProPr54 web server: predicting σ54 promoters and regulon with a hybrid convolutional and recurrent deep neural network #NAR from Anne de Jong 👉 propr54.molgenrug.nl academic.oup.com/nargab/artic...
academic.oup.com
ProPr54 web server: predicting σ54 promoters and regulon with a hybrid convolutional and recurrent deep neural network
Abstract. σ54 serves as an unconventional sigma factor with a distinct mechanism of transcription initiation, which depends on the involvement of a transcr
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Alessandro Rigolon @alerigolon.bsky.social · 10/02/2025
I was just told that I have to remove “climate” from the title of an ongoing grant if I want to keep it. And publications from that grant cannot include “climate” and other forbidden words. I can’t believe I’m writing this from the United States of America. #AcademicSky
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