Sometimes ago Tom @tommclean.bsky.social uncovered a mechanism of bacterial gene regulation based on a clamp sliding and locking in a multi-drug resistance plasmid, RK2. www.nature.com/articles/s41...

🧵 New preprint out! We asked: what happens to gut bacteria when the intestine is under chronic inflammation (IBD)? Turns out, the host's inflammatory state reshapes how they evolve, and the results are pretty striking. A thread 👇

TrbA binds and locks a sliding clamp KorB to repress transcription on multi-drug resistance plasmids https://www.biorxiv.org/content/10.64898/2026.05.27.728120v1

New paper out! 🔈 Genomic Characterization of the RyC collection: 50 Multidrug Resistant Clinical Isolates of Escherichia coli and Klebsiella spp. 50 MDR gut isolates, 2 sequencing platforms, 4 “omes,” and 1 mission: provide a resource to decode AMR and MGE dynamics www.biorxiv.org/content/10.6...

Happy to share that our latest research on the eco-evolutionary dynamics of MDR plasmids and PDPs is now out (open access vAuthor) in The ISME Journal doi.org/10.1093/isme... Here, we explored how plasmid-dependent phages (PDPs) act as a selective pressure against the spread of multidrug resistance

What if multireplicon plasmids are not an oddity, but an evolutionary strategy? We found that they are common, more mobile, broader-host-range, and enriched in AMR. Even more interesting: their assembly doesn’t look random. 👀 Paper preprint: www.biorxiv.org/content/10.6... Thread below!🧵👇

🚨 New preprint from the lab! 🚨 We show that multireplicon plasmids are true AMR "jack-of-all-trades": Widespread, highly mobile, broad host-range, and packed with resistance genes. Far from random, they form co-evolving associations driven & 𝘮𝘢𝘪𝘯𝘵𝘢𝘪𝘯𝘦𝘥 by IS elements. See Nacho's thread below!👇👇

This one means a lot. Our paper, “Large extrachromosomal replicons are widespread across bacterial lineages and show coordinated replication termination and spatial coupling with the chromosome,” is out! doi.org/10.1038/s414...

A really cool method we are just starting to explore!

We have a PhD studentship available to develop genome safeguarding technologies for synthetic phage therapeutics www.findaphd.com/phds/project... It is part of an exciting new @officialuom.bsky.social PhD by Enterprise programme www.bmh.manchester.ac.uk/study/resear...

Today Is the deadline for abstract submissions ‼️

Very proud of this work and all the efforts from my team and collaborators on this! You can now use DGRs for in vivo targeted hypermutagenesis in E. coli. We also included some early proof of concept in Yeast thanks to @seth-shipman.bsky.social !

🔈Paper out! We turned the most fascinating phage host-switch mechanism, diversity-generating retroelements, into a programmable mutagenesis tool, DGRec. You can perform targeted hypermutation of any 50-200bp sequence directly in vivo in E. coli www.nature.com/articles/s41...

Our ms on re-sampling 4 years apart vibrio phage in natural environments is now out with some improvements. First, clearer evidence of cryptic population dynamics between phage and vibrio, presumably because of genetic diversity. www.nature.com/articles/s41...

Huge work! Joint effort over four years of EPC Rocha & Fred Le Roux Labs sampling in the wild for 4 years! www.nature.com/articles/s41... @epcrocha.bsky.social @fredoleroux.bsky.social

Please remember that the International Symposium on Plasmid Biology (ISPB 2026) will take place 7–11 September 2026 in Berlin, Germany! A great opportunity to meet, reconnect, and engage with the global plasmid biology community. 🤝 plasmid-biology-2026.de

And the preprint is out! www.biorxiv.org/content/10.6... We compared plasmid conjugation in liquid and on solid across 13 AMR plasmids with different types of conjugative pili.

Our latest manuscript explores capsule exchangeability & phenotypic portability We didn’t directly address its role in #virulence ⏩️ that was already elegantly shown here—worth a look 👀👇🏻 doi.org/10.1371/jour... 🎯 Their results supports our plug-and-play model! Bonus: we kept 🐭 alive #microsky

So happy to see this finally published in @plosbiology.org! This is the first chapter of @julielebris.bsky.social PhD thesis demonstrating how capsules are exchanged by plug-and-play dynamics w/ @epcrocha.bsky.social #microsky @klebclub.bsky.social Link below- Check out her 🧵 for more details!

New preprint alert!!! 🚀🤓 We are very happy to finally share this with the world — the result of seven years of work and a new tool to study integrons and discover new functions encoded in these bacterial platforms. If you want to know more, here is a thread 🧵 www.biorxiv.org/content/10.6...

Horizontal gene transfer is often depicted as a process distributing pre-existing functions to novel genetic backgrounds. Yet HGT can also increase the rate of functional innovation after transfer. Here's a brief review on the topic: ecoevorxiv.org/repository/v... #evosky #microsky

Final version of our last paper is out! www.nature.com/articles/s41...

Excited to share our latest work! 📝 We measured the fitness effect of 136 AMR genes and found that many are neutral or even beneficial without selection. 🤯🧬 Oxygen availability can flip their fitness and our stochastic model indicates that oxygen fluctuations help maintain them. Learn more 👇🏼

Fantastic collaboration w/ @dbikard.bsky.social @audeber.bsky.social @rayanchikhi.bsky.social labs led by @jmouradesousa.bsky.social : We assessed the rates of variation of anti-phage systems in P4-like satellites and P2 helper phages. Quick conclusion: Huge variation! We focus on 4 key questions/5

➡️ preprint from the lab! Bacteria have loads of antiviral defences in their mobile genetic elements (MGEs). So when MGEs move between bacteria, the defences move with them, generating a fast turnover of defences in bacteria. But what about the antiviral defence turnover in the MGEs themselves? 🤔 🧵👇

🔬 New work from the Mazel Lab engineers programmable conjugative plasmids to selectively target MDR bacteria and the resistance plasmid pOXA-48, blocking its spread in complex communities. ✍️ @amazeld.bsky.social & coll. @pasteur.fr 📖 shorturl.at/GZdJu #MicroSky #AntibioticResistance #Conjugation

New preprint out on bioRxiv! www.biorxiv.org/content/10.6... Can conjugative plasmids be used to control plasmid and pathogen spread? Follow me down the rabbit hole that led to this story 🧵

New pre-print with @wtmatlock.bsky.social!!! www.biorxiv.org/content/10.6... What shapes the distribution of plasmids across bacteria? Our paper shows that conjugative plasmids actually have a very narrow distribution compared to mobilizable plasmids. Conjugative systems restrict plasmid transfer!

Out now in @plosbiology.org : our big joint effort on the role of #CRISPR in plasmid competition. Read on for a really fun (I’m biased ok) analysis of how a defence system has new selective pressures when it’s mobile journals.plos.org/plosbiology/... 1/6

Gracias a @siefrancia.bsky.social por esta experiencia tan bonita. Participar en su asamblea anual junto a una grande como Lola Pons y rodeada de este fantástico ambiente con tan güena gente ha sido espectacular 🥰

How does treatment induced antibiotic resistance happen in real-world infections? We analysed 25k Pseudomonas isolates from 180 patients in a clinical trial to find out! TLDR: The ecological and evolutionary paths are surprisingly diverse & complex even in patients receiving identical treatment…

A short research stay in 2019 (back in the pre-COVID era) at José R. Penadés lab turned into the third chapter of my PhD and today it finally sees the light.

On this fabulous day celebrating André Citroën's birthday 🥖🚗, I’m happy to share my main paper from my postdoc in @jrpenades.bsky.social Lab. If you want to hear about how plasmid evolution is driven by mobile genetic elements, please come and read this preprint! www.biorxiv.org/content/10.6...

🚨 Hiring Alert! 🚨My lab at Institut Pasteur is recruiting several Postdocs! We have exciting open projects in: 🦠 Synthetic Biology and🛡️ Bacterial Immunity. Come do great science with us in the middle of Paris! 🇫🇷🥐 research.pasteur.fr/en/job/postd...

New paper out in PNAS!!! 🎉 Do more plasmid copies mean faster evolution? 🧵 Dive into the story www.pnas.org/doi/10.1073/...

Bacteria chromosomes contain Genomic Islands that provide virulence, antibiotic resistance, MGE-defence,... They transfer between cells, but the mechanism of most remains elusive. Here we explore the conjugative capacity of these mysterious Genomic Islands. www.biorxiv.org/content/10.6...

Delighted to see the main work from my PhD finally published in @mbio.bsky.social! It all started with the observation that deleting the cutRS two-component system in S. venezuelae caused this amazing explorer phenotype in the presence of glucose. But what was going on?! (1/n)

Our new paper on DusB’s role in redox metabolism in V. cholerae is now out in @narjournal.bsky.social linking tRNAmodif enzymes and metabolic adaptation. Beyond RNA modification: a tRNA-modifying enzyme shaping oxidative stress resilience and metabolism in V. cholerae #rnasky #rnabiology 😊🦠💫

Our story on plasmid streamlining is now published in PLoS Biology! With @andrewmatthews.bsky.social and @sonjalehtinen.bsky.social #MicroSky #Mevosky journals.plos.org/plosbiology/...

We've come full circle! I began my postdoctoral career by identifying the peptidyl deformylase gene. Today, we show that half of bacterial species harbor multiple PDF genes (up to 7, for always a single Met-tRNA transformylase), and while the role of these PDFs ... academic.oup.com/mbe/article/...

Stable inheritance of the Streptomyces linear plasmid SCP1 by dual ParABS partition systems https://www.biorxiv.org/content/10.64898/2025.12.10.693275v1

Taming wild replicons: evolution and domestication of large extrachromosomal replicons #MicroSky www.sciencedirect.com/science/arti...

What is the best strategy to win any contest? Eliminate your opponents of course. Recently, my friend @fernpizza.bsky.social showed how plasmids compete intracellularly (check out his paper published in Science today!). With @baym.lol, we now know they can fight. www.biorxiv.org/content/10.1...

Hot off the press! Our latest paper led by @fernpizza.bsky.social, understanding how plasmids evolve inside cells. These small, self-replicating DNA circles live inside bacteria and carry antibiotic resistance genes, but also compete with one another to replicate. 1/ www.science.org/doi/10.1126/...

🚨 PhD opportunity! 🚨 Join us at St Andrews to study how multiple prophages shape bacterial behaviour & AMR. Co-supervised with @tatianadimitriu.bsky.social This is a competition-based EASTBIO PhD. Full details and the application link are in the advert 👇 www.findaphd.com/phds/project...

Our new paper is out in @narjournal.bsky.social We show that natural transformation enables bacteria to shuffle integron cassettes, boosting their phenotypic diversity. academic.oup.com/nar/article/... 1/5

Very excited to share our latest work in Science on metagenomic editing (MetaEdit) of the gut microbiome in vivo & directly modifying unculturable immune-modulatory SFB bug in the small intestine. 🦠🧬🛠️ www.science.org/doi/10.1126/...

🚨 Excited to share our new paper is out! 🎉 We show how interactions within gut microbiomes allow certain antibiotic-resistant E. coli strains to persist even without antibiotics, helping explain how resistance is maintained in the human gut. Now published in @natcomms.nature.com rdcu.be/eOf63

@prczhaoyansong.bsky.social’s deep dive into the dark matter of compost communities is now out 🎉 Genomic islands hijack jumbo phages—whose capsids enable transfer of large tracts of DNA—shedding new light on the scale & scope of phage-mediated gene flow 😎 www.pnas.org/doi/10.1073/...

New pre-print: Plasmid dependent phage effectively eliminate AMR bacteria and block plasmid transmission in the chicken gut microbiome Fun collaboration with Tao He lab (JAAS) and @brockhurstlab.bsky.social lab (Manchester) #phagesky#microsky www.biorxiv.org/content/10.1...