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Sarah Bigot

@sbigot

Director of research CNRS at MMSB (C. Lesterlin/tacc team) interested in cellular and molecular mechanism of horizontal gene transfer https://mmsb.cnrs.fr/equipe/transfert-d-adn-entre-cellules-bacteriennes/

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05.02.2024
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Latest posts by Sarah Bigot @sbigot

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Plasmids promote antimicrobial resistance through insertion sequence-mediated gene inactivation - Nature Microbiology Inactivation of chromosomal genes through plasmid-encoded IS elements is an extended mechanism of antimicrobial resistance evolution in bacteria.

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

13.03.2026 11:52 👍 95 🔁 58 💬 6 📌 1

Are you investigating the biology of prokaryotic or eukaryotic cells? Are you looking for an excellent scientific environment to establish and lead your own research team? The I2BC is your place and a new call for team leaders is now open.
More info👇Deadline 22nd April
@i2bcparissaclay.bsky.social

11.03.2026 13:10 👍 11 🔁 17 💬 0 📌 0
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Postdoctoral researcher in molecular and cellular bacteriology - ERC CoG VAMPIRE The research group of Prof Géraldine Laloux at the de Duve Institute (UCLouvain) is looking for a highly motivated postdoc to elucidate the molecular factors underlying bacterial prey-predator interac...

#MicroSky Please RT
@erc.europa.eu-funded postdoc position in my lab to identify the molecular basis of prey-predator interactions using our favorite micro-vampire Bdellovibrio exovorus as a model.
Let's find what the bite is made of! 🧛
Flexible start date.
Info: euraxess.ec.europa.eu/jobs/415877

05.03.2026 15:01 👍 19 🔁 25 💬 0 📌 1
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This is the first time we observed bacteria use plasmolysis to defence against phages! biorxiv.org/content/10.6...
Thanks all the authors to discover this together! @fnobrega.bsky.social Zhiying @garushyants.bsky.social Dinshaw and Eugene

04.03.2026 00:03 👍 8 🔁 6 💬 2 📌 0

🎉 We are thrilled to share our latest study revealing a new mechanism by which Legionella pneumophila evades antibiotic killing via reversible genetic variation mediated by integrative and conjugative elements (ICEs).
📖 Here for the full story:
www.biorxiv.org/content/10.6...

02.03.2026 08:44 👍 7 🔁 5 💬 0 📌 0

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 🧵

26.02.2026 09:54 👍 53 🔁 35 💬 5 📌 1
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💡 We are inviting you to nominate a woman in microbiology whose work or impact deserves to be seen.

Selected nominations will be featured on the FEMS website and across our social media channels on International Women’s Day, 8 March.

👉 Who inspires you? Nominate them by 4 March . buff.ly/AKyMbQD

19.02.2026 13:00 👍 12 🔁 19 💬 1 📌 1
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Type IV secretion systems: reconciling diversity through a unified nomenclature This review presents a comprehensive overview of Type IV Secretion Systems (T4SSs), focusing on their structural, functional, and evolutionary diversity ac

Happy to share a new review proposing a unified nomenclature for T4SSs.
Great collaboration with Peter J Christie, Gabriel Waksman, Ronnie Per-Arne Berntsson and our team.
academic.oup.com/femsre/artic...
#T4SS#Microbiology

18.02.2026 14:13 👍 21 🔁 15 💬 0 📌 2
Ingénieur-e en biochimie des protéines IE26-MICA-1 - Vous rejoindrez l'unité mixte de recherche DynAMic, qui rassemble des chercheur-es, enseignant-es-chercheur-es et personnels d'appui autour de l'étude des mécanismes d'évolution rapide des bactéries. Les travaux de l'unité portent sur le transfert de l'information génétique, son intégration dans le génome bactérien et les mécanismes de régulation associés, avec des enjeux forts en lien avec la dissémination de la résistance aux antibiotiques.Vous serez accueilli-e au sein de l'équipe ICE-TeA, qui s'intéresse plus particulièrement aux mécanismes moléculaires du transfert horizontal de gènes, et interviendrez également en appui des activités de l'équipe StrAda, dédiée à l'étude des mécanismes de recombinaison. Votre environnement de travail est fortement collaboratif, avec des interactions étroites avec des équipes locales spécialisées en cristallographie, en résonance magnétique nucléaire et autres techniques d'analyse, ainsi qu'avec une plateforme technologique disposant d'équipements de pointe pour l'étude des interactions moléculaires.Dans ce contexte scientifique exigeant, votre poste occupe une place centrale pour le développement des projets de recherche de l'unité. Vous piloterez les activités de production, d'analyse et de caractérisation des protéines, contribuerez à la structuration des approches expérimentales et jouerez un rôle clé dans la transmission des savoir-faire, la qualité des données produites et le bon fonctionnement des équipements. Vous contribuerez au bon développement des différents projets (planification, gestion des ressources, etc) et assurerez des missions de formation et d'encadrement). Dans ce cadre, vous serez en charge des activités suivantes :Production, purification et analyse des protéines :-Choisir, développer et adapter les protocoles de production et de purification de protéines recombinantes-Mettre en oeuvre et optimiser des techniques de biochimie et de biologie moléculaire (production de protéines hétérologues, électrophorèse, clonage, séquençage, PCR, purification protéines)-Conduire les analyses fonctionnelles et structurales des protéines en lien avec les projets de recherchePilotage technique, qualité et équipements :-Organiser et gérer les moyens techniques nécessaires aux projets scientifiques-Assurer le fonctionnement, le suivi métrologique et la maintenance des équipements-Mettre en oeuvre une démarche qualité et garantir la traçabilité et la fiabilité des résultats-Assurer une veille scientifique et technologique dans le domaine de la biochimie des protéinesFormation, encadrement et animation scientifique :-Former et accompagner les membres de l'unité aux techniques de production et d'analyse des protéines-Apporter un appui méthodologique et technique aux projets de recherche-Participer à la diffusion et à la valorisation des résultats sous forme de présentations et de publications-Contribuer au respect des règles d'hygiène et de sécurité au laboratoire

Ingénieur-e d'étude en biochimie des protéines en concours externes INRAE.
Si vous êtes passionnés par les biochimie des protéines et souhaitez rejoindre un environnement dynamique, n'hésitez pas à postuler (Clôture des inscriptions : 19 Mars)
jobs.inrae.fr/concours/con...

18.02.2026 14:20 👍 0 🔁 1 💬 0 📌 0

Un poste de MCF (👇) s'ouvre dans notre unité MMSB, avec possibilité d'accueil dans mon équipe
Venez travailler avec nous sur les mécanismes moléculaires impliqués dans la réponse au stress et la modulation de la croissance chez les bactéries!
N'hésitez pas à me contacter si vous êtes intéressés!

29.01.2026 10:18 👍 0 🔁 2 💬 0 📌 0

📢 Recrutement d’un(e) Maître(sses) de conférence en Biochimie générale, spécialité bactériologie moléculaire à MMSB

🔬Recherche
*Immunité anti-phages
*Réponse au stress, modulation de la croissance bactérienne
✉️ christophe.grangeasse@cnrs.fr

📚Enseignement : Université Lyon I
✉️ patrice.gouet@ibcp.fr

29.01.2026 10:15 👍 1 🔁 8 💬 0 📌 2

Un poste de Maître de Conférence est ouvert pour rejoindre notre unité à Lyon !

Possibilité de rejoindre mon équipe pour travailler sur:
- caractérisation des mécanismes de défense anti-phage
- transfert horizontal et interactions entre éléments génétiques mobiles

N'hésitez pas à me contacter

29.01.2026 20:39 👍 11 🔁 17 💬 0 📌 0

Great new story from Sophie Helaine and Molly Sargen!

www.helainelab.com

28.01.2026 23:01 👍 35 🔁 18 💬 0 📌 0
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PlasAnn: a curated plasmid-specific database and annotation pipeline for standardized gene and function analysis Abstract. Conjugative plasmids are key drivers of bacterial adaptation, enabling the horizontal transfer of accessory genes within and across diverse micro

Big week: welcomed a new baby boy Harris Lopatkin, AND our PlasAnn paper is finally out: academic.oup.com/nar/article/... (obviously the first more important than the second 🥰). Currently on leave but if anyone has the need to annotate large plasmids, go check it out!

27.01.2026 16:59 👍 56 🔁 19 💬 5 📌 0

New paper out in @pnas.org, and it made the cover! 👁️

We represent plasmids as circles and mutations as dots, resembling an eye, because in this paper we literally 𝑤𝑎𝑡𝑐ℎ plasmids evolve.

‼️Check Paula’s 🧵 and the paper👇

𝗣𝗹𝗮𝘀𝗺𝗶𝗱 𝗺𝘂𝘁𝗮𝘁𝗶𝗼𝗻 𝗿𝗮𝘁𝗲𝘀 𝘀𝗰𝗮𝗹𝗲 𝘄𝗶𝘁𝗵 𝗰𝗼𝗽𝘆 𝗻𝘂𝗺𝗯𝗲𝗿
www.pnas.org/doi/10.1073/...

27.01.2026 20:23 👍 98 🔁 44 💬 3 📌 3

New publication from the Lesterlin (TacC) team at MMSB! Congratulations to all authors. In collaboration with Pierre Bogaerts (UCL Belgium) and J. Villa (UB Barcelona)

doi.org/10.1093/nar/...

26.01.2026 09:37 👍 4 🔁 3 💬 0 📌 0
Two D-loop resolution systems enable natural genetic transformation in bacteria Natural transformation is a widespread mechanism driving genetic exchanges in bacteria. It proceeds by the capture and internalization of exogenous DNA in linear single strands, ultimately integrated in the genome by homologous recombination. It is unknown how the RecA-directed D-loop intermediate of this dedicated recombination pathway is processed. We report that resolution of the transformation D-loop depends on two endonucleases of opposing phylogenetic distribution in bacteria. One is YraN, which has co-evolved and interacts with the ComM helicase, known to extend DNA recombination at the transformation D-loop. The other is CoiA, which is restricted to the Bacillota. CoiA is shown to be a resolvase of the transformation D-loop, extended by the RadA helicase in these species. We demonstrate that both YraN and CoiA act synergistically with their cognate helicases. These findings reveal that bacteria have evolved two helicase/nuclease pairs for the maturation and recombination extension of the transformation D-loop. ### Competing Interest Statement The authors have declared no competing interest. Agence Nationale de la Recherche, https://ror.org/00rbzpz17, ANR-20-CE12-0004, ANR-10-BLAN-1331, ANR-17-CE13-0031, ANR-22-CE44-0044, ANR-10-LABX-62-IBEID, PIA/ANR-16-CONV-0005 Fondation pour la Recherche Médicale, https://ror.org/04w6kn183, FDT202001010890 European Union's Horizon research and innovation programme. Marie Skłodowska-Curie Postdoctoral Fellowships, 101208987 National Institute of Health, USA, R35GM128674

#microsky
Massive update of preprint with @polardlab.bsky.social!
Bacteria have evolved two systems to recombine extracellular DNA
www.biorxiv.org/content/10.1...
Kudos to lead authors Léo Hardy, Violette Morales and Clothilde Rousseau, and to outstanding Dalia's lab and @epcrocha.bsky.social
🧵⬇️

16.01.2026 16:23 👍 18 🔁 8 💬 1 📌 0

🚨L'ENS de Lyon recrute un.e maître de conférence qui rejoindra le CIRI pour développer ses recherches sur l'immunité bactérienne, les transferts horizontaux et les MGE.

📖 Une très belle opportunité d'enseigner à des étudiants brillants tout en menant des recherches excitantes !

14.01.2026 17:02 👍 9 🔁 11 💬 1 📌 0

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...

14.01.2026 10:14 👍 83 🔁 53 💬 4 📌 2
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My team at @cbitoulouse.bsky.social is recruiting a postdoc #bioinformatics with solid experience in metagenomic analyses.
Interest in evolution, ecology & MGEs is important.
The offer stands until the perfect candidate is found, and it could be you 🫵

🔁 🙏

#microSky #phagesky #UTIsky
@cnrs.fr

15.01.2026 11:19 👍 27 🔁 55 💬 1 📌 0

Neisseria gonorrhoeae carries an unusually large number of restriction–modification systems (up to 16!), many of which are phase-variable. How does this affect plasmid transmission in gonococci? doi.org/10.64898/202...

13.01.2026 13:40 👍 14 🔁 10 💬 2 📌 0

Une opportunité unique de former des étudiants talentueux à la biologie des bactéries à l'ENS Lyon et mener des recherches sur les phages, l'immunité bactérienne, le transfert génétique horizontal (HGT) et/ou les éléments génétiques mobiles au sein du département de bactériologie du CIRI.

13.01.2026 14:01 👍 8 🔁 14 💬 0 📌 0

📢 Recruitment of an Associate Professor (Maître de conférences) in Bacteriology at CIRI and ENS de Lyon.
Research at @ciri-lyon.bsky.social @francoisrousset.bsky.social
@labxc.bsky.social
Anti-phage Immunity, Horizontal gene/ MGE transfer
📚 Teaching at ENS de Lyon within the Department of Biology.

13.01.2026 08:47 👍 3 🔁 6 💬 1 📌 2
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Coupling DNA processing to early gene expression drives antibiotic resistance plasmid dissemination The rapid global spread of antibiotic resistance is mediated by conjugative plasmids, yet how these elements establish immediately after entering new bacterial hosts remains poorly understood. Here we...

New bioRxiv preprint from our Lesterlin lab
How early gene expression coupled to DNA processing boosts resistance plasmid spread.
With @nfrk92.bsky.social in collab with Y. Yamaichi lab
👉 doi.org/10.64898/202...

12.01.2026 08:56 👍 20 🔁 12 💬 0 📌 0
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Bacterial conjugation can restructure biofilms and increase their resilience while constraining host cell dispersal Winans et al. show how plasmid transfer can reorganize bacterial communities into dense aggregates, conferring antibiotic and phage tolerance to otherwise sensitive host cells. Conjugation-dependent a...

Beautiful work from Jay Winans in the Nadell Lab @dartmouthartsci.bsky.social showing IncF plasmid pED208 spreading like wildfire through E. coli biofilms www.cell.com/current-biol...

16.12.2025 23:02 👍 18 🔁 11 💬 1 📌 0
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Streptococcus pneumoniae S protein activates PBP1a to regulate peptidoglycan remodelling and cell division Nature Microbiology - S protein interacts with and activates PBP1a during cell division, as part of a larger GpsB-associated multiprotein complex that coordinates peptidoglycan remodelling in...

New publication from the Grangeasse's team at MMSB! Congratulations to all authors. In collaboration with Cecile Morlot (IBS, Grenoble) and David Rooper (Warwick university).
To know more : rdcu.be/eVsin

20.12.2025 14:01 👍 6 🔁 2 💬 0 📌 0
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Pili are essential for conjugation also in many Gram-positive bacteria Type IV secretion systems (T4SS) enable the spread of antibiotic resistance and other virulence factors. In Gram-positive bacteria, T4SSs have long been thought to lack VirB2-like proteins that form c...

📣New preprint with @rberntsson.bsky.social👇We overturn the long-standing view that Gram-positive bacteria lack conjugative pili! We identify pili-forming proteins in a wide range of bacteria and show they're essential for the spread of #antibioticresistance #AMR 🧵1/6
www.biorxiv.org/content/10.6...

30.12.2025 18:03 👍 33 🔁 16 💬 1 📌 2
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Poly-immunity arrays associated with Rhs toxins confer wide protection against competitors Martinkus et al. show that Photorhabdus and Xenorhabdus species encode arrays of immunity genes whose protein products neutralize toxins secreted by competitors. These arrays, often linked to Xer pass...

We propose immuno-centric view of secreted polymorphic toxin diversification and involvement of novel XPC systems in this process! Fantastic work of @jmartinkus.bsky.social with lab of @cascaleslab.bsky.social !
www.cell.com/current-biol...

15.12.2025 17:45 👍 7 🔁 7 💬 0 📌 1
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Plasmid streamlining drives the extinction of antibiotic resistance plasmids under selection for horizontal transmission Conjugative plasmids play an important role in the spread of antimicrobial resistance (AMR) genes among pathogenic bacteria. This study shows that AMR loss in evolving populations is associated with t...

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/...

12.12.2025 12:09 👍 59 🔁 31 💬 3 📌 0
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Beyond RNA modification: a novel role for tRNA modifying enzyme in oxidative stress response and metabolism Abstract. RNA modifications play a fundamental role in regulating essential cellular processes, including translation fidelity and stress adaptation. While

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

😊🦠💫

13.12.2025 20:57 👍 41 🔁 17 💬 8 📌 2