Florian Tesson

Congratulations to Sonomi Yamaguchi for her paper at @nature.com. Sonomi discovered Clover defense and explained how nucleotide signals control each step of viral sensing, immune regulation, and viral restriction – named for her beautiful "four-leaf" structures 🍀

www.nature.com/articles/s41...

The paradox of immune systems conservation between prokaryotes and eukaryotes - Nature Reviews Microbiology The widespread prokaryotic immune systems, in particular restriction–modification, CRISPR–Cas and defensive toxin–antitoxin systems, are absent in eukaryotes, whereas relatively rare ones, such as Arg...

Aude Bernheim @audeber.bsky.social and Eugene Koonin discuss one of most interesting questions in the field connecting bacterial and animal immunity!

www.nature.com/articles/s41...

Conférence Scientifique Grand Public & Performance Artistique - "Virus contre bactéries : Une solution pour vaincre la résistance aux antibiotiques ?" - Pascale Cossart & Fabrice Hyber - Research L’Institut Pasteur vous ouvre ses portes et vous invite à une conférence scientifique pour le grand public, accompagnée d’une performance artistique ! Pascale Cossart parlera de virus et de bactéries,...

🦠🧫 Envie d'en savoir plus sur la Microbiologie et de découvrir l'Institut Pasteur ?

Rejoignez nous pour conférence scientifique grand public, accompagnée d’une performance artistique le 27 janvier à 18h! Inscrivez-vous :)

research.pasteur.fr/fr/event/con...

Advancing Fast-Track Genome Engineering in Bacillus subtilis Phages Phage genome engineering methods accelerate the study of phage biology, the discovery of new functions, and the development of innovative genetic engineering tools. Here, we present QuickPhage, a rapi...

Advancing Fast-Track Genome Engineering in Bacillus subtilis Phages

ACS Synthetic Biology

pubs.acs.org/doi/10.1021/...

Environment and physiology shape antiphage system expression Bacteria and archaea encode on average ten antiphage systems. Quorum sensing, cellular, or transcription factors can regulate specific systems (CRISPR-Cas, CBASS). Yet, a systematic assessment of anti...

Bacterial genomes encode a rich repertoire of antiphage systems, but we still know surprisingly little about when these systems are actually expressed.

In this preprint, Lucas Paoli et al, ask what shapes antiphage systems expression in native contexts.
www.biorxiv.org/content/10.6...

🧬🛡️How are new immune mechanisms created?

We show how Lamassu antiphage system, originated from a DNA-repair complex and evolved into a compact and modular immune machine, wt Dinshaw Patel lab in @pnas.org.
👏 @matthieu-haudiquet.bsky.social, Arpita Chakravarti & all authors!

doi.org/10.1073/pnas...

We built GenoPHI: a machine learning workflow that predicts phage-host interactions at strain level. This could help rapidly select phages to treat drug-resistant bacterial infections or for microbiome engineering without exhaustive lab testing.

www.biorxiv.org/content/10.1...

JOB OFFER #PhageSky

We have a postdoc position opening in my group to investigate phage-MGE interactions !

We're based in the very nice city of Lyon, France @mmsb-lyon.bsky.social

Contact me for more info !

>> Apply on the CNRS webpage emploi.cnrs.fr/Offres/CDD/U...

Recurrent acquisition of nuclease-protease pairs in antiviral immunity Antiviral immune systems diversify by integrating new genes into existing pathways, creating new mechanisms of viral resistance. We identified genes encoding a predicted nuclease paired with a trypsin...

Excited to finally share this work!
We noticed a pair of genes - a nuclease and a protease - shuffles between antiviral systems. We show how proteolysis activates the nuclease, triggering defense in known and unknown immune contexts.
tinyurl.com/2uwwy4ty

Temperate phages enhance host fitness via RNA-guided flagellar remodeling Bacterial flagella drive motility and chemotaxis while also playing critical roles in host-pathogen interactions, as their oligomeric subunit, flagellin, is specifically recognized by the mammalian im...

Excited to share the work that’s been on my mind for the past 2 years, now on bioRxiv!
Led with Matt Walker, and my first project in the Sternberg Lab .
Check it out ⬇️

tinyurl.com/mshwjd77

Bacterial Schlafens mediate anti-phage defense Human Schlafen proteins restrict viral replication by cleaving tRNA, thereby suppressing protein synthesis. Although the ribonuclease domain of Schlafen proteins is conserved across all domains of lif...

First preprint from the Nemudryi Lab! 🍾

In this work, we link antiviral immunity in bacteria and humans by showing that homologs of human Schlafen nucleases protect bacteria from phages.

www.biorxiv.org/content/10.1...

A human protein inherited from bacteria reveals an overlooked aspect of human immunity What if the study of bacteria could illuminate our understanding of human immunity? In recent years, scientists have been exploring unexpected links between human proteins involved in the body’s defen...

🧬 From bacteria to humans: a new study led by @institutcurie.bsky.social, @institutpasteur.bsky.social & @inserm.fr reveals SIRal, a novel human immune protein with ancestral roots. A new path for immunotherapy?

🔗 Read: www.pasteur.fr/en/press-are...

🦠🧍‍♀️From bacterial to human immunity.

We report in @science.org the discovery of a human homolog of SIR2 antiphage proteins that participates in the TLR pathway of animal innate immunity.
Co-led wt @enzopoirier.bsky.social by D. Bonhomme and @hugovaysset.bsky.social

www.science.org/doi/10.1126/...

📢Preprint out!
Excited to share my final work from the @soreklab.bsky.social!

We mined phage dark matter using structural features shared by anti-defense proteins (viral tools that help phages bypass bacterial immunity) to guide discovery.

Found 3 new families targeting immune signaling!

Signez la pétition Sauvons le Palais de la découverte

Le Palais de la Découverte est menacé! Il a contribué à éveiller ma passion pour la science quand j'étais petit. Nous devons tout faire pour protéger ce lieu unique qui a toute sa place au cœur de Paris. Signez la pétition ici: chng.it/BnR9gZvhL2

The Viral AlphaFold Database of monomers and homodimers reveals conserved protein folds in viruses of bacteria, archaea, and eukaryotes https://www.biorxiv.org/content/10.1101/2025.05.14.653371v1

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...

White smoke, we have a new pope and also 16 new anti-phages systems in sedentary integrons (SCIs) !
In collaboration with the Rocha lab, we show in our new paper that cassettes of these large platforms encode many known anti-phage defenses, and uncovered 16 new ones.
www.science.org/doi/10.1126/...

Out in Nature today: A new immune signaling molecule, His-ADPR, is produced by defensive TIR domain proteins in bacteria to protect from phage

Joint work with the Tamulaitienė and Kranzusch labs

www.nature.com/articles/s41...

Congrats Carmel Avraham, Dziugas Sabonis, Renee Chang and co-authors!

It was an honor for my lab and myself to host the meeting on the Immune Systems of Bacteria. Such a high from all the incredible science and sharing with scientists from the whole world the greatness of Paris in the spring.
Vive la science, et vive Paris!

Structural basis for Lamassu-based antiviral immunity and its evolution from DNA repair machinery https://www.biorxiv.org/content/10.1101/2025.04.02.646746v1

CBASS, CRISPR, and mCpol- oh my! What a satisfying collaboration with @aaronwhiteley.bsky.social 's lab- we uncovered a new cyclic dinucleotide signaling pathway, but it doesn't work how you'd expect! Check out the thread from @aesully98.bsky.social for an overview of the most important findings!

Genetics, ecology and evolution of phage satellites Nature Reviews Microbiology, Published online: 27 March 2025; doi:10.1038/s41579-025-01156-zIn this Review, Penadés et al. explore the genetics, potential origins and life cycle of phage satellites, and they discuss the impact of these elements on the evolution of other mobile genetic elements and their host bacteria.

New online! Genetics, ecology and evolution of phage satellites

Protein-primed DNA homopolymer synthesis by an antiviral reverse transcriptase Bacteria defend themselves from viral predation using diverse immune systems, many of which sense and target foreign DNA for degradation. Defense-associated reverse transcriptase (DRT) systems provide...

Hello BlueSky! Inaugural post here from the Sternberg Lab. We're excited to share our latest work, in which we teamed up with the @WiedenheftLab to study how DRT9 reverse transcriptases provide antiviral immunity. Here’s what we found: www.biorxiv.org/content/10.1...

New version of DefenseFinder available defensefinder.mdmlab.fr (& cli)

Now encompassing 263 systems (+111 this year..!).

Thanks @ftesson.bsky.social, DefenseFinder grandmaster. Full list of systems here: defense-finder-models/List_system_article.md at master · mdmparis/defense-finder-models

Specificity and Mechanism of tRNA cleavage by the AriB Toprim nuclease of the PARIS bacterial immune system Transfer RNA molecules have been recently recognized as widespread targets of bacterial immune systems. Translation inhibition through tRNA cleavage or modification inhibits phage propagation, thereby...

Happy to share our latest piece of work on the PARIS bacterial immune system. We performed a detailed characterization of the AriB Toprim nuclease, the effector of PARIS immunity.

www.biorxiv.org/content/10.1...

Image with text that reads: It's happening now: I know it's totally overwhelming but here are just a handful of things happening in US Science & public health RIGHT NOW. I need you to know, so you can realise how you are being defrauded from a healthy, disease free future, with thriving science. I need you to know, so you can tell others.

Huge thanks to my sister for helping put these together.

I'm thrilled to announce our latest work is now published in Cell! Viruses encode numerous proteins that inhibit host defenses, but identifying immune-modulatory proteins among millions of viral sequences has been nearly impossible - until now! www.cell.com/cell/fulltex...

Phage defence system abundances vary across environments and increase with viral density www.biorxiv.org/content/10.1... #jcampubs

Institut Pasteur decides to leave X The Institut Pasteur, a research organization which for more than 130 years has been committed to tackling infectious diseases, sharing knowledge and defending science, has decided to leave X because ...

The Institut Pasteur has decided to leave X (formerly Twitter) to join BlueSky! 🦋
The Institut Pasteur made this decision due to several serious issues observed on the X platform since its acquisition. Join us here to continue advocating for science. www.pasteur.fr/en/home/pres...

Update_DefenseFinder_open

If you want to help us update DefenseFinder, you can add all the systems we could have missed on this table (suggestion sheet): docs.google.com/spreadsheets...
You can also see which systems are already included in the next version of DefenseFinder