Professor of Molecular Microbiology, Education Director @LeidenBiology, Vici Laureate, Morphogenesis, Wall-Deficiency, claessenlab@mstdn.science, Views=Mine

Joined May 2010
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I am so fortunate to work with this team of inspirational people each day. You are the best!
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Excited to see our latest paper online @NatureComms. Fantastic team science with great collaborators and friends! nature.com/articles/s41467-0…

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The Claessen Lab retweeted
Welcome to Leiden @Kelly_Chibale. It will be my honour to install you as honorary doctor during the celebration of the 450th birthday of @UniLeiden #Praesidiumlibertatis @LeidenBiology @H3D_Foundation
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The Claessen Lab retweeted
Join us for @ISBA2025 on Actinomycetes at the lovely beach of Egmond aan Zee (NL), from June 15–19, 2025. Topics include development, drug discovery, ecology and pathogenicity. universiteitleiden.nl/isba20…. Registration and abstract submission here: tinyurl.com/ISBA2025.
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Excited that @ISBA2025 will be in the Netherlands in June!! Please register and submit your abstract(s)!
Join us for @ISBA2025 on Actinomycetes at the lovely beach of Egmond aan Zee (NL), from June 15–19, 2025. Topics include development, drug discovery, ecology and pathogenicity. universiteitleiden.nl/isba20…. Registration and abstract submission here: tinyurl.com/ISBA2025.
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The Claessen Lab retweeted
10 Dec 2024
Registration is now open for the 2025 Symposium on the Immune System of Bacteria, taking place this year in Paris (April 8-10). We have a fantastic lineup of speakers! Register here: sisb2025.conferences-pasteur…

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Join us in Paris on April 8th-10th for the 2025 Symposium on the Immune System of Bacteria πŸ₯–πŸ·πŸ¦ πŸ§¬. Excited to welcome these amazing speakers at @institutpasteur . Registration will open beginning of November. Abstract deadline February 28. Stay tuned.
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Proud of this new preprint from the lab!
Bacterial cell wall, biofilm and morphology enthusiasts - our new preprint shows how E. coli manages to survive without its essential cell wall! Check it out πŸ‘‡#microbiology #bacteria @LeidenBiology @ClaessenLAB @HandeWinde
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The Claessen Lab retweeted
Bacterial cell wall, biofilm and morphology enthusiasts - our new preprint shows how E. coli manages to survive without its essential cell wall! Check it out πŸ‘‡#microbiology #bacteria @LeidenBiology @ClaessenLAB @HandeWinde
Enhanced extracellular matrix production provides protection to cell wall-deficient Escherichia coli biorxiv.org/cgi/content/shor… #biorxiv_micrbio
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The Claessen Lab retweeted
Please RT. 1x postdoc and 1xPhD position available in our group to study the role of NLR-like proteins in cellular development and antibiotic production in Streptomyces. Postdoc: shorturl.at/f8NTN PhD position: shorturl.at/qCFmN Email me for more information.

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The Claessen Lab retweeted
It's out!! Great review on Terrabacteria led by @BasileBeaud and Najwa Taib with @ChrisBel70. So much to discover on envelope biogenesis and the diderm-to-monoderm transition in this understudied clade! @NatureRevMicro @institutpasteur @Fondation_BS ReadπŸ‘‡rdcu.be/dSegH

Happy to share a chapter of my PhD thesis🐣! We review the diversity of the cell envelope in Terrabacteria which tell us a lot about outer membrane biogenesis and the diderm-to-monoderm transition. Thanks to my co-authors Najwa Taib @ChrisBel70 @SGribaldo nature.com/articles/s41579-0…
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The Claessen Lab retweeted
Skip the Olympics, watch this masterpiece. πŸ”Š

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The Claessen Lab retweeted
This is a very important paper suggesting that the Last Universal Common Ancestor of all living species lived 4.2 billion years ago. With Earth being only 4.5 billion years old, this suggests that life originated very soon after conditions were favorable. bit.ly/3Y2wiPC
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The Claessen Lab retweeted
Having a great week at #GRC Microbial Stress Response in Mount Holyoke and super excited to be nominated as co-chair to organize the next #GRS in 2026! πŸ’š
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The Claessen Lab retweeted
Always fun to discuss with collaborators on Monday afternoon: Dennis Classen, @derozenleiden, @HelenaShomar, @pnleao, @BriegelAriane and...two members from @FrunzkeLabπŸ¦œπŸ™ƒ
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The Claessen Lab retweeted
🚨Super excited to share our pre-print describing how we used genomics to discover a family of anti-phage lanthipeptides from Actinobacteria 🦠 This marks a significant expansion in the number of bacterial natural products involved in chemical defense. A thread πŸ‘‡: @MDMlab_Paris
A family of lanthipeptides with anti-phage function biorxiv.org/cgi/content/shor… #biorxiv_micrbio
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Is er @ZiggoWebcare storing in 2481? Modem lamp knippert rood
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The Claessen Lab retweeted
International meeting of the VAAM special section Microbial Cell Biology Two days of inspiring talks, poster sessions and discussions on all aspects of bacterial and archaeal cell biology. October 6-8, 2024, in Marburg (Germany) eventbrite.de/e/microbial-ce… Register soon - only a limited number of spots available! @VAAM_Microbes
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Excited to see the latest paper out as a preprint on bacterial heterozygosity in a unique L-form system. Largely pulled together by the fantastic @she_toot.
Excited to present this work on bacterial polyploidy from my previous postdoc! Want to know about a genetic diversity strategy that is like having backup codes to unlock the perfect resistance combo? Read all about it (1/4) biorxiv.org/content/10.1101/…
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The Claessen Lab retweeted
Excited to present this work on bacterial polyploidy from my previous postdoc! Want to know about a genetic diversity strategy that is like having backup codes to unlock the perfect resistance combo? Read all about it (1/4) biorxiv.org/content/10.1101/…
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The Claessen Lab retweeted
29 Apr 2024
Interested in studying towards a Master degree in evolutionary biology? Join our international Master program in Molecular Biology and Evolution in northern Germany! Registration is open until the 15.6. Details: tinyurl.com/3rm273cn
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