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Joshua Hamm

@joshnhamm.bsky.social
118 followers 74 following 26 posts

Post-Doctoral Researcher in the EvoSym Group. Investigating DPANN-host interactions. jnhamm.wordpress.com

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Reposted by Joshua Hamm
Florian Mayer @florianmayer.bsky.social · 11/09/2026
Excited to share our preprint on Ignicoccus cell divison: only the inner membrane divides, progeny cells accumulate in cell clusters and pop-out! www.biorxiv.org/content/10.6... Great work with the labs: @buzzbaum.bsky.social @curiousdina.bsky.social @anja1.bsky.social @tbharat-lab.bsky.social
biorxiv.org
The life cycle of an archaeon with multiple membranes
Many prokaryotes are diderms. They divide using an FtsZ division ring to simultaneously constrict physically coupled inner and outer membranes to form daughter cells with two membranes. Currently, onl...
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Reposted by Joshua Hamm
Chung Hyun Cho @chc-evobio.bsky.social · 04/07/2026
Excited to share our new preprint led by Fred and me in collaboration with the archaeal community! We found that the molecular foundation of histone-based chromatin has pre-eukaryotic roots in Asgard archaea. (1/4) #ArchaeaSky www.biorxiv.org/content/10.6...
biorxiv.org
Emergence of histone-based chromatin complexity in Asgard archaea
The emergence of the eukaryotes coincided with the diversification of histone proteins and their post-translational modifications by enzymes that constitute the core of eukaryotic chromatin. Yet the e...
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Daniel Tamarit @danieltamarit.bsky.social · 22/05/2026
I'm looking for an enthusiastic student to join my team as a PhD candidate on archaeal genome evolution 🦠💻 Work in beautiful Utrecht, at @binfutrecht.bsky.social, an international group full of caring, amazing scientists, and with frequent cake breaks! www.uu.nl/en/organisat... Please share! 🙏
uu.nl
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Sonja-Verena Albers @archaellum.bsky.social · 20/05/2026
New preprint! Cell division has to happen at the right place but how Archaea pick that place is unknown. We now identified a three-protein system, Dip, that positions the divisome at midcell in H. volcanii and is broadly conserved across Archaea. A thread 🧵 www.biorxiv.org/content/10.6...
biorxiv.org
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Joshua Hamm @joshnhamm.bsky.social · 19/05/2026
Our paper examining the evolution of halophily in DPANN is out now in MBE! academic.oup.com/mbe/advance-...
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Reposted by Joshua Hamm
Reinier Egas @raegas.bsky.social · 14/04/2026
Grab a coffee and enjoy reading up on CO metabolism in methanotrophs! Freshwater ANME (own work): www.nature.com/articles/s41... Marine ANME (@Orphan lab): www.nature.com/articles/s41... Big thanks to our collaborators at QUT! @sjmcilroy.bsky.social (Heyu/Andy/Gene!) @cuwelte.bsky.social
nature.com
Carbon monoxide metabolism in freshwater anaerobic methanotrophic archaea - Nature Communications
Anaerobic methane-oxidizing archaea mitigate methane emissions in anoxic environments. Here, Egas et al. show that these microbes can also oxidize carbon monoxide, prompting re-evaluation of their cla...
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Reposted by Joshua Hamm
Reinier Egas @raegas.bsky.social · 13/04/2026
Preprint out! Anaerobic methanotrophs are key methane oxidizers, but their activity/adaptation under acidic conditions remains unclear. We show that a freshwater ANME adapts to pH stress via shifts in lipid composition and remains metabolically active down to pH 5.65. Expanding the niche of ANME.
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Brendan Burns @brendanburns999.bsky.social · 10/04/2026
Immensely rewarding part of this work was working with Indigenous language experts and elders in the naming of our species of Asgard….’marumarumayae’ derived from the Malgana language from the people of Gathaagudu (#Shark Bay)
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Reposted by Joshua Hamm
Alex Loy @loyteam.bsky.social · 29/03/2026
📢 New paper 🚨 ☘️🌿🌱🐄💨🦠🔬🧫🧬 #sulfoquinovose #microbiome #microsky #microbiomesky academic.oup.com/ismej/articl...
academic.oup.com
Sulfoquinovose degradation by cow rumen microbiota
Abstract. Sulfoquinovose, a sulfonated sugar derived from the thylakoid membrane lipid sulfoquinovosyl diacylglycerol, is abundant in photosynthetic organi
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Reposted by Joshua Hamm
DEEMteam_Orsay @deemteam.bsky.social · 23/03/2026
We have just published a short note on archaeal phylogeny: complex mixture models support a deep placement of Methanonatronarchaeia within Euryarchaea and indicate that three recently described groups (Halorutilales, Afararchaeaceae, and Ordosarchaeia) are actually the same. shorturl.at/5GMpU
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Buzz Baum @buzzbaum.bsky.social · 16/12/2025
Are you a long-time fan of Archaea, an extremophile-phile, or are you simply curious? Either way, we have good news. We’re delighted to announce the 2026 EMBO Workshop on Archaea, 6–10 July. Sign up: meetings.embo.org/event/26-arc... We look forward to seeing you in Cambridge, UK. Please repost!
meetings.embo.org
Molecular Biology of Archaea: Life Through the Prism of Archaea
In 1977, Woese and colleagues revealed Archaea as a distinct domain of life. Building on this insight, the discovery of Asgard archaea has strengthened the view that many hallmarks of eukaryotic cell…
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Joshua Hamm @joshnhamm.bsky.social · 18/11/2025
Ever since publishing our observations of the predatory behaviour of Ca. Nha. antarcticus people have asked me why it would want to kill its host. My perspective discussing the ecological factors that I believe led to this behaviour is out now in mSystems: doi.org/10.1128/msystems.01475-25
doi.org
Nutrient availability affects optimal growth strategy in predatory DPANN | mSystems
The bacterial and archaeal domains each possess a major clade that appears to be predominantly host-associated (1–3). These two lineages, Patescibacteriota and DPANN archaea (named for the Diapherotri...
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Wen-Cong Huang @wentsunghwang.bsky.social · 13/11/2025
#Archaea, #DPANN, #phylogenetic_reconciliation New preprint online! www.biorxiv.org/content/10.1...
biorxiv.org
Phylogenetic reconciliation supports a methanogenic ancestor of the Archaea and a derived origin for host-associated lineages
The phylogeny of the Archaea continues to be revisited and revised as new groups are discovered and phylogenetic methods improve, but key questions about their early evolution remain. It has been sugg...
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Reposted by Joshua Hamm
Daniel Tamarit @danieltamarit.bsky.social · 23/10/2025
Exultant to have been awarded a Vidi grant by the Dutch Research Council (NWO)! Can't wait to get started! Stay tuned for two upcoming (PhD student & postdoc) positions to study archaeal genome evolution. Also huge congrats to my colleague @dorotakawa.bsky.social! www.uu.nl/en/news/21-v...
uu.nl
21 Vidi grants awarded to Utrecht-based researchers
21 researchers from Utrecht University, University Medical Center Utrecht, and Princess Máxima Center have each been awarded a Vidi grant worth up to €850,000.
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Reposted by Joshua Hamm
Jeffrey Ross-Ibarra @jrossibarra.bsky.social · 21/10/2025
Lunch today halfway around the world in Hangzhou and met a new asst professor who was very thankful for this resource. Please help out folks like them and other early career scientists with examples of job apps. Submit yours! github.com/RILAB/statem...
github.com
GitHub - RILAB/statements: Successful Job Applications and Grants
Successful Job Applications and Grants. Contribute to RILAB/statements development by creating an account on GitHub.
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Reposted by Joshua Hamm
Taylor priest @taylorpriest.bsky.social · 21/10/2025
The ecological and phylogenetic partitioning of coastal and offshore SAR11 is underpinned by a handful of distinct metabolic traits under high selective pressure - academic.oup.com/ismej/advanc...
academic.oup.com
Habitat-specificity in SAR11 is associated with a few genes under high selection
Abstract. The order Pelagibacterales (SAR11) is the most abundant group of heterotrophic bacteria in the global surface ocean, where individual sublineages
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Reposted by Joshua Hamm
Archaea Power Hour @archaeapowerhour.bsky.social · 17/10/2025
WE ARE BACK!!! Archaea Power Hour will return this coming WEDNESDAY, Oct. 22nd at 10AM EST/4PM CET. Check your email for the Zoom link (coming soon) or register here: forms.gle/6QvCjHH2H4pxro…. Take a look at the exciting talks we have planned to kick off our fall seminar series:
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Archaea.bio @archaeabio.bsky.social · 15/10/2025
Live cell imaging of Ca. Nha. antarcticus and Hrr. lacusprofundi using agarose pads. Protocol now live! www.archaea.bio/protocols/li...
archaea.bio
Live Cell Imaging of Ca. Nha. antarcticus and Hrr. lacusprofundi using agarose pads
This protocol is an adapted form of the protocol developed for imaging haloarchaea (Liao et al., 2021) and subsequently applied to co-cultures containing nanohaloarchaea and haloarchaea (Hamm et al., ...
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Tom Williams @tweethinking.bsky.social · 09/10/2025
There's a PhD position now available with me in Bath, on the evolution of symbiosis. www.findaphd.com/phds/project.... The supervisory team also includes @anja1.bsky.social @phil-donoghue.bsky.social and others. NB, this is open both to UK-based students *and* to international students :)
findaphd.com
The genomic basis of symbiotic integration at University of Bath on FindAPhD.com
PhD Project - The genomic basis of symbiotic integration at University of Bath, listed on FindAPhD.com
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Alex Probst @alexjprobst.bsky.social · 26/09/2025
New article on equitable reuse of public sequencing data, published in @natmicrobiol.nature.com! Led by the Data reuse core team @lhug.bsky.social @environmicrobio.bsky.social Cristina Moraru, @geomicrosoares.bsky.social, @folker.bsky.social and with Anke Heyer and The Data Reuse Consotrium!
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Roland Hatzenpichler @environmicrobio.bsky.social · 26/09/2025
Our article on equitable reuse of public sequencing data is out! Led by @alexjprobst.bsky.social, @lhug.bsky.social, Cristina Moraru, @geomicrosoares.bsky.social, @folker.bsky.social and myself -, co-authored by Anke Heyder, and developed in consultation with 167 scientists. tinyurl.com/n6yeanmk
tinyurl.com
A roadmap for equitable reuse of public microbiome data - Nature Microbiology
In this Consensus Statement, a consortium of microbiome scientists discuss current sequencing data sharing policies and propose the use of a Data Reuse Information (DRI) tag to promote equitable and collaborative data sharing.
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Reposted by Joshua Hamm
Mike Jetten @msmjetten.bsky.social · 18/09/2025
Great new trait of #Methanoperedens archaea: Carbon monoxide metabolism in freshwater anaerobic #methanotrophic archaea #aom #anme Egas @cuwelte.bsky.social et al #microbiology @ribesresearch.bsky.social www.biorxiv.org/content/10.1...
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Sonja-Verena Albers @archaellum.bsky.social · 17/09/2025
Happy to share that our story on the bacterial archaellum was published today in @natmicrobiol.nature.com www.nature.com/articles/s41... Congrats to the authors: @sshamphavi.bsky.social @loumollat.bsky.social @mariejoest.bsky.social Najwa Taib and @sgribaldo.bsky.social
nature.com
Structure of a functional archaellum in Bacteria of the Chloroflexota phylum - Nature Microbiology
Bona fide gene clusters for archaella are widespread across a bacterial phylum and encode functional motility machinery.
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Reposted by Joshua Hamm
Rodrigo Sánchez Martínez @rodrisanchez95.bsky.social · 11/09/2025
🦠➡️🧬 Community context matters! In the second part of my PhD, we show how microbial complexity drives phage–bacteria ecology & evolution. Check out the preprint 👇🏼
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Reposted by Joshua Hamm
Molecular Biology and Evolution @molbioevol.bsky.social · 08/09/2025
Huang, @tweethinking.bsky.social, Sepang et al. use phylogenetic analyses to reveal that the Njordarchaeales and Panguiarchaeales constitute the new class Njordarchaeia within Asgard archaea. 🔗 doi.org/10.1093/molbev/msaf201 #evobio #molbio #archaea
doi.org
Phylogenomic Analyses Reveal that Panguiarchaeum Is a Clade of Genome-Reduced Asgard Archaea Within the Njordarchaeia
Abstract. The Asgard archaea are a diverse archaeal phylum important for our understanding of cellular evolution because they include the lineage that gave
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Reposted by Joshua Hamm
Taylor priest @taylorpriest.bsky.social · 14/08/2025
The JEDI marker - a new approach for measuring #biodiversity that captures all domains of life and is applicable across biological and ecological scales. It's time to change the way we perceive biodiversity - www.biorxiv.org/content/10.1...
biorxiv.org
The JEDI marker as a universal measure of planetary biodiversity
Despite its critical importance in the formation and maintenance of ecosystems and homeostasis on Earth, biodiversity remains a complex and non-unified concept. Consequently, standards for measuring b...
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Lorenzo Olivi @loreoliv.bsky.social · 22/08/2025
🧵 Our study on the elusive titration control mechanism of the replication initiator DnaA in Escherichia coli is now out on @natcomms.nature.com‬! @stephkoe.bsky.social @hohlbeinlab.bsky.social‬ @nicoc-micsynmet.bsky.social @ettema.bsky.social‬ @mib-wur.bsky.social doi.org/10.1038/s414...
doi.org
The Escherichia coli replication initiator DnaA is titrated on the chromosome - Nature Communications
A DNA-binding protein, DnaA, regulates the initiation of chromosomal replication in bacteria. Here, Olivi et al. show that the bacterial chromosome sequesters DnaA in a growth rate-dependent manner, s...
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Wen-Cong Huang @wentsunghwang.bsky.social · 14/08/2025
academic.oup.com/mbe/advance-... Happy to share this one. We investigated the #phylogenetic placement and #genome_evolution of Pangui/Njordarchaea-unique #Asgardarchaea that might have undergone genome reduction...
academic.oup.com
Phylogenomic analyses reveal that Panguiarchaeum is a clade of genome-reduced Asgard archaea within the Njordarchaeia
Abstract. The Asgard archaea are a diverse archaeal phylum important for our understanding of cellular evolution because they include the lineage that gave
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Reposted by Joshua Hamm
Sonja-Verena Albers @archaellum.bsky.social · 20/08/2025
Who would have thought I would ever publish an article about a bacterium? But here it is, but of course only because Litorilinea aerophilum actually has an archaellum! Here is what we learned about its cell structure and other surface appendages: www.biorxiv.org/content/10.1...
biorxiv.org
Filamentous growth, cell envelope architecture, and surface appendages of a member of the Chloroflexota, Litorilinea aerophila
Litorilinea aerophila, a filamentous bacterium of the phylum Chloroflexota (class Caldilineae), exhibits unique morphological and cell envelope features that challenge traditional bacterial models. In...
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Joshua Hamm @joshnhamm.bsky.social · 08/08/2025
New preprint up now! Interested in the evolution of halophily within DPANN archaea we decided to investigate the sister phylum to the Nanohaloarchaeota, GTDB phylum EX4484-52, for which we propose the name Caliditerrarchaeota www.biorxiv.org/content/10.1...
biorxiv.org
Caliditerrarchaeota, a new sister to Nanohaloarchaeota, provides insights into the evolution of DPANN halophily
The Nanohaloarchaeota are a clade of halophilic symbionts with small cells and genomes. Originally placed within the Euryarchaeota, they are now widely thought to belong to the DPANN archaea. However,...
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Roland Hatzenpichler @environmicrobio.bsky.social · 06/08/2025
If you are a postdoc working on any topic related to environmental microbiology and are looking for exposure, the Thermal Biology Institute (tbi.montana.edu) has slots open for virtual talks via zoom this fall. Email me if you are interested! Seminars are most Mondays, 3-4 pm Mountain Time.
tbi.montana.edu
Thermal Biology Institute - Default | Montana State University
Index to the Thermal Biology Institute's website.
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Rodrigo Sánchez Martínez @rodrisanchez95.bsky.social · 04/08/2025
Check out the new paper of my former lab about novel haloviruses infecting Haloquadratum walsbyi, the "square queen archaeon" of hypersaline systems 👑🟪 academic.oup.com/ismej/advanc...
academic.oup.com
Novel viruses of Haloquadratum walsbyi expand the known archaeal virosphere of hypersaline environments
Abstract. Solar salterns represent unique systems with low diversity microbial communities that serve as an excellent model for studying the evolution and
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Daniel Tamarit @danieltamarit.bsky.social · 14/05/2025
New vacancy in my team! PhD student position on microbial genome evolution, focusing on the evolutionary principles underlying bacterial genome architecture. Please repost and share with talented MSc students in #evobio, bioinformatics or related :) www.uu.nl/en/organisat... #MEvoSky #MicroSky
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Jolien van Hooff @jvhooff.bsky.social · 05/03/2025
Exciting news! I'm looking for a computational biologist to join my lab at Wageningen University & Research! It's a 3-year postdoc position on Holomycota genome architecture and evolution. Spread the word! www.wur.nl/en/vacancy/p...
wur.nl
Postdoc Comparative genomics and genome architecture in early-diverging fungi and their protist relatives (3-year position)
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Carlos Santana Molina @santanamolina.bsky.social · 03/03/2025
Asgardarchaea & Alphaproteobacteria: key players for the assembly eukaryotic central carbon metabolism! Our new study reveals their gene contributions to glycolysis & TCA cycle, supporting synthrophic scenarios of eukaryogenesis. rdcu.be/eb0aK
rdcu.be
Chimeric origins and dynamic evolution of central carbon metabolism in eukaryotes
Nature Ecology & Evolution - Analysis of the eukaryotic gene repertoires mediating central carbon metabolism identifies ancestral contributions from Alphaproteobacteria, Asgardarchaeota and...
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Tom Williams @tweethinking.bsky.social · 17/02/2025
www.biorxiv.org/content/10.1... A new collaborative paper with Anja Spang, Wen-Cong Huang, @chrisrinke.bsky.social @ettema.bsky.social @ssolo.bsky.social Zheng-Shuang Hua Maraike Probst and Lenard Szantho. We investigated the phylogenetic position and metabolic evolution of Panguiarchaeum.
biorxiv.org
Phylogenomic analyses reveal that Panguiarchaeum is a clade of genome-reduced Asgard archaea
The Asgard archaea are a diverse archaeal phylum that includes the host lineage from which eukaryotes evolved. Due to the importance of the Asgard archaea for our understanding of cellular evolution a...
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Anja (she/her) @anja1.bsky.social · 12/02/2025
Are you interested in studying archaea with their diverse symbionts? We look forward hearing from you: workingat.nioz.nl/o/postdoc-po...
workingat.nioz.nl
NIOZ - Postdoc position: “to elucidate the role of archaeal symbionts in cellular evolution and ecology”
The EvoSym Team within the Department of Marine Microbiology and Biogeochemistry (MMB) located at the Netherlands Institute for Sea Research (NIOZ), is looking for a postdoctoral researcher with a bac
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Laboratory of Microbiology @mib-wur.bsky.social · 30/01/2025
Hello Bluesky! Follow us for updates on our Microbiology research here @w-u-r.bsky.social
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Archaea Power Hour @archaeapowerhour.bsky.social · 16/01/2025
Archaea aficionados around the world, APH is now on BlueSky! Follow us for virtual conference announcements and more 🦠
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Dina Grohmann @curiousdina.bsky.social · 16/01/2025
Let’s have fun at the GRC Archaea … you will find that the Archaeophile crowd is the most collaborative and welcoming community ever ☺️🦠
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Joshua Hamm @joshnhamm.bsky.social · 15/01/2025
In case you missed it the GRC and GRS for Archaea 2025 are both open for applications! Join us in Switzerland for the latest iteration of this awesome conference! #archaeasky
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