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Ella Sieradzki

@sieravirus.bsky.social
741 followers 385 following 116 posts

Assistant professor @ Aarhus University | ERC starting 2024 | Microbial/viral ecology | crazy cat lady | @EMG_Lyon @jemersonmicro @UCBerkeley @Firestone_lab @BanfieldLab @JedFuhrman 🇮🇱🇺🇦

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Ella Sieradzki @sieravirus.bsky.social · 21/08/2026
Fun time at #ISME20 with old and new friends
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Ella Sieradzki @sieravirus.bsky.social · 09/04/2026
Deadline is April 20th! Let’s get those viruses
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Ingrida Olendraite @ingrida.bsky.social · 16/03/2026
RNA virus Journal Club is on! 🌳March 17th | Tuesday, 10 AM Berkeley time / 18 PM CET 🕰️ You've probably heard about the meta-virus resource? We will get to dive into metaVR database & huge viral diversity within thanks to @mattlabguy.bsky.social 🥳 All welcome! Details ⬇️ @rdrpsummit.bsky.social
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Ella Sieradzki @sieravirus.bsky.social · 09/03/2026
I'm hiring my first postdoc! Apply by 20/4/26, position #20443. Seeking an environmental microbiologist with experience in metagenomics (preferably viromics) and molecular biology. Experience with targeted metabolomics is a plus. international.au.dk/about/profil...
international.au.dk
Postdoc in Soil viral ecology - Vacancy at Aarhus University
Vacancy at Department of Agroecology - Plant Pathology and Microbiology, Aarhus University
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Ella Sieradzki @sieravirus.bsky.social · 05/02/2026
It depends on the sample type. In soil there are a few buffers people use, like PBS or potassium citrate. It’s anyone’s guess as to the real yield, and it would depend on mineral types and humics content.
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Ella Sieradzki @sieravirus.bsky.social · 03/02/2026
According to the site it’s due to a governmental funding freeze. That’s not likely to improve in the next couple of years, sadly. ENA is very convenient and syncs with NCBI.
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Ella Sieradzki @sieravirus.bsky.social · 03/02/2026
A. You're alive! 🍻 B. counter-counterargument, viruses in the <0.2 µ fraction were lytic at some point and therefore definitely had an effect on the microbial community. C. There's no guarantee that viral contigs from bulk DNA are doing anything. They could be lysogens or just junk DNA.
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Ella Sieradzki @sieravirus.bsky.social · 03/02/2026
Absolutely. No method perfect. But to make overarching statements about what drives viral communities or what viruses drive in general when you’re looking at a random 2-3% of a non perfect sample is just ridiculous.
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Ella Sieradzki @sieravirus.bsky.social · 03/02/2026
If you want to see just how big the difference is, I recommend this paper: doi.org/10.1038/s413...
doi.org
Viromes outperform total metagenomes in revealing the spatiotemporal patterns of agricultural soil viral communities
AbstractViruses are abundant yet understudied members of soil environments that influence terrestrial biogeochemical cycles. Here, we characterized the dsD
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Ella Sieradzki @sieravirus.bsky.social · 03/02/2026
This is the equivalent of making overarching statements about microbial community based on cultured microorganisms. It's just not valid. The amount of non viral DNA in a bulk metagenome is so overwhelming that no matter how deeply you sequence, you will never get a good representation. 3/n
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Ella Sieradzki @sieravirus.bsky.social · 03/02/2026
It's been shown repeatedly that viruses from bulk metagenomes represent at best 2-3% of the viral community found in viromes (size selection for <0.2µ pre-sequencing), and it's not even necessarily the most abundant viruses that are represented in that subsample. 2/n
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Ella Sieradzki @sieravirus.bsky.social · 03/02/2026
Soil viral ecology notice: having found myself rejecting paper after paper for the same reason, let me make this clear. If you're trying to draw conclusions about the drivers/effects of the viral community but your data is from bulk metagenomes, not viromes, that's an automatic no from me. 1/n
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Ella Sieradzki @sieravirus.bsky.social · 30/01/2026
Provisionally accepted! Proceedings of the 2nd RdRp summit on RNA viruses out in Frontiers in virology. I attended the 1st RdRp summit, was an organizer of the 2nd but broke my leg and had to bail. Hoping to see more virus enthusiasts at the 3rd summit in 2027! www.frontiersin.org/journals/vir...
frontiersin.org
Frontiers | Editorial: "Proceedings of the RdRp Summit and Advances in RNA Virus Discovery"
Following the success of the first meeting, the second RdRp Summit was held on May 11-12, 2025, 40 in Lisbon, Portugal. Two years had passed since the first ...
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Ella Sieradzki @sieravirus.bsky.social · 15/01/2026
Came to learn about polar microbiomes and found myself at the carnaval. Gotta love #PAM2026
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Ella Sieradzki @sieravirus.bsky.social · 13/01/2026
Soil is hard to work with, polar areas are hard to work in and viruses are hard to work on, but Gary didn’t let any of these deter him. The full paper is now out in Nature Comms!
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Lars Gamfeldt @gamfeldt.bsky.social · 10/11/2025
Opportunity! Anybody knows of young marine ecologists (within 7 years from earned PhD) that would like to come to Gothenburg, Sweden, for a nationally funded Assistant Professorship? It is highly competitive but well funded. (1) of (3)
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Ella Sieradzki @sieravirus.bsky.social · 21/10/2025
Impressive. I don’t think I’ll be keeping it at lower than -70 so that makes sense.
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Ella Sieradzki @sieravirus.bsky.social · 21/10/2025
I’m pretty sure that’s the consensus. Murphy is strong with these freezers.
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Ella Sieradzki @sieravirus.bsky.social · 21/10/2025
Yes, I learned the hard way that you should always have sensors and an online alert system. These things always break down on Christmas Eve.
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Ella Sieradzki @sieravirus.bsky.social · 21/10/2025
Let's talk -80 freezers: Recommendations? Dis-recommendations? What do you suggest prioritising and why? Bonus points if you have input on buying one in Europe. * photo of Muffin for cat tax
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Ella Sieradzki @sieravirus.bsky.social · 25/04/2025
Interested in RNA virus discovery? You can still register for the RdRp summit and attend remotely! We'll have some really nice talks and cutting edge discussions on best practices and new directions in the field. rdrp.io #phagesky #virosky #bioinformatics
rdrp.io
rdrp.io
The official website of the RdRp Summit.
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RdRp Summit @rdrpsummit.bsky.social · 03/04/2025
EXCITING NEWS🥳! @isme-microbes.bsky.social is now sponsoring 3 travels grants worth EUR 500 each to support early career researchers presenting at the #RdRpSummit2025. Abstract submissions & registrations are still open!✍️ More info at RdRp.io
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Ákos T Kovács @evolvedbiofilm.bsky.social · 25/03/2025
Calls for papers from FEMS Microbiology Ecology: Thematic Issue on Ecology of Soil Microorganisms Editors: @pbaldrian.bsky.social @jennihultman.bsky.social Petr Kohout Minna Männistö @tainapennanen.bsky.social academic.oup.com/femsec/pages... Submission deadline: 28 November 2025
academic.oup.com
Calls for papers from FEMS Microbiology Ecology
FEMS Microbiology Ecology, publishing leading research in the microbial ecology community, publishes a variety of thematic issues covering a diverse range of to
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Ella Sieradzki @sieravirus.bsky.social · 25/03/2025
Will you be at ViBiom? I’ll be there in May 🙂
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Ella Sieradzki @sieravirus.bsky.social · 25/03/2025
All this to say, the journey isn't linear. Not even close. It also can't be separated from our private lives. Sometimes life is overwhelming, and all you can do is keep your head above the water and accept help. You will reap the rewards eventually. The end.
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Ella Sieradzki @sieravirus.bsky.social · 25/03/2025
So it was with great joy that when I won the grant, I brought it here with me. I won't pretend that everything is easy. The transition to faculty is daunting and scary, but my colleagues and friends here are supportive and motivating. I'm so excited to start mentoring my very own PhD student. 11/n
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Ella Sieradzki @sieravirus.bsky.social · 25/03/2025
That's when Aarhus University @au.dk came into the picture. I interviewed with the department of agroecology and flew over for a visit. I've never felt so welcome in academia. Moreover, I felt safe for the first time in months. I was offered a position before my ERC grant interview. 10/n
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Ella Sieradzki @sieravirus.bsky.social · 25/03/2025
Throughout all of this I was applying for tenure track jobs. I had some interviews, but no offers. I had made it into the interview stage of the ERC, but in March 2024 I was almost resigned to finding some remote big data job and settling down in a small village in Bretagne. 9/n
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Ella Sieradzki @sieravirus.bsky.social · 25/03/2025
Many think that life in Israel went on as usual in 2023 and 2024. Let me tell you, it did not. Even my family in Tel Aviv, arguably one of the safer areas, went in and out of the bomb shelter. I can't even imagine what it was like for those living even slightly farther north or south. 8/n
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Ella Sieradzki @sieravirus.bsky.social · 25/03/2025
The ERC kindly extended the deadline by 2 weeks, so I managed the writing and admin by the deadline. My second year in France was far from productive or happy, but I was blessed with good friends who supported me while I tried to be there for my family in Tel Aviv. 7/n
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Ella Sieradzki @sieravirus.bsky.social · 25/03/2025
I felt like my world was collapsing around me. Nothing and nowhere felt safe anymore. Even going to work was terrifying. A couple of weeks later, with a looming deadline and shattered confidence, I went to England to stay with my cousin. It was there that I felt safe enough to be able to focus. 6/n
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Ella Sieradzki @sieravirus.bsky.social · 25/03/2025
worked on setting up preliminary lab experiments and finishing backlog papers. A few months later, I decided to apply for an ERC starting grant application. It was a long writing process, but I made good headway. The deadline was supposed to be November 1st, 2023. Then came October 7th. 5/n
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Ella Sieradzki @sieravirus.bsky.social · 25/03/2025
A couple of months later, when we thought the worst was over, my dad was diagnosed with a rare neurodegenerative disease. It's been almost 3 years since the initial diagnosis and only recently did the doctors find a medication that gives him some relief. I decided to keep pushing anyway, and... 4/n
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Ella Sieradzki @sieravirus.bsky.social · 25/03/2025
I got to France in the super hot summer of 2022, received an equally warm welcome from my hosts and lab members, and was so excited for the next two years. A month into my stay my mom was diagnosed with cancer. Fortunately it was caught early, and I was happy to at least be able to fly home. 3/n
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Ella Sieradzki @sieravirus.bsky.social · 25/03/2025
Many thanks to my colleagues and co-authors: Gary Trubl, Jennifer Pett-Ridge, Erin Nuccio, Steve Blazewicz, and especially my hosts in France Graeme Nicol and Christina Hazard. Funded by European Commission Marie Sklodowska-Curie postdoctoral fellowship DIVOBIS. This road wasn't easy.
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Ella Sieradzki @sieravirus.bsky.social · 25/03/2025
RNA phages are phosphate limited, and possibly as implicated as their DNA counterparts in soil microbiome dynamics following soil wetup (first rain after the dry season). Out today in SBB! doi.org/10.1016/j.so... @soilmicrobes.bsky.social 1/n
doi.org
Redirecting
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Gareth (Gary) Trubl @gtrubl.bsky.social · 25/03/2025
Our paper is out and is open access! Phosphate amendment drives bloom of RNA viruses after soil wet-up. www.sciencedirect.com/science/arti... @sieravirus.bsky.social @jeffinerca.bsky.social @graemenicol.bsky.social @christinahazard.bsky.social
sciencedirect.com
Phosphate amendment drives bloom of RNA viruses after soil wet-up
Soil rewetting after a dry period results in a surge of activity and succession in both microbial and DNA virus communities. Less is known about the r…
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Ella Sieradzki @sieravirus.bsky.social · 12/02/2025
Marine nitrifies are incredibly important for the global nitrogen cycle. Tangentially, I met Sookie at #ISME2024 and we had lots of fun testing out South African food and cocktails. www.biorxiv.org/content/10.1...
biorxiv.org
Basin-scale dynamics and enrichment-enabled genomics of marine nitrifiers: seasonality, niches, interactions, and genomic uniqueness
Nitrification occurs widely from the deep sea to animal holobionts, but the eco-evolutionary forces shaping the niches and dynamics of the lineages of the chemoautotrophic bacteria and archaea respons...
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Ella Sieradzki @sieravirus.bsky.social · 12/02/2025
A beautiful initiative: crowdfunding to purchase and protect biodiversity hotspots worldwide via local NGOs. I'm so in! this-is-my-earth.org
this-is-my-earth.org
TiME · This is My Earth
We buy lands rich in biodiversity and hand them over to local communities and NGOs to protect. You can vote and decide which land to save.
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Ella Sieradzki @sieravirus.bsky.social · 30/01/2025
Going to #ViBioM2025 ? Interested in discovery of RNA viruses? Consider joining us 2 days early (May 11-12) in Lisbon for the 2025 RdRp summit @rdrpsummit.bsky.social ! Program and abstract submission will be available soon. We'll talk advances in methodology from isolation to bioinformatics.
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Ella Sieradzki @sieravirus.bsky.social · 28/01/2025
MOAR DOG NAU
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Ella Sieradzki @sieravirus.bsky.social · 21/01/2025
Using stable isotope probing in the lab and wondering how it compares to reality in the field? Look no further. Bottom line: microcosms are more prone to opportunists, but aren't a horrible approximation. Considering labor/price differences I'd say they're acceptable journals.asm.org/doi/pdf/10.1...
journals.asm.org
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Ella Sieradzki @sieravirus.bsky.social · 15/01/2025
Definitely saw this in mediterranean grassland via metatranscriptomics www.biorxiv.org/node/4329066...
biorxiv.org
Distribution of alternative routes for completing denitrification in microbial genomes and metagenomes of global biomes
Diverse microorganisms can execute one or more steps in denitrification, during which nitrate or nitrite is successively reduced into nitric oxide, nitrous oxide, and ultimately dinitrogen. Many of th...
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Pete Chuckran @pchuckran.bsky.social · 13/01/2025
Wetting dry soil rapidly stimulates microbial activity and has important consequences for biogeochemical cycling. In our paper out today, we show that part of that response can be explained by how bacterial genomes are written (i.e. codon usage, nucleotide freq., genome size) doi.org/10.1073/pnas...
doi.org
PNAS
Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans...
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Aude Bernheim @audeber.bsky.social · 13/01/2025
👋 Hi antiphage defense community, we are soon releasing an update of DefenseFinder. We are doing our best to include all the great discoveries from the community, but with so much going on we might miss things. Please answer wt preprints/papers with new systems or mail/git them to us. 🙏
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Ella Sieradzki @sieravirus.bsky.social · 13/01/2025
I would allot a certain amount per student per year. Within reason, I think it should be paid for by the PI. I also paid my own and in retrospect I think it was a mistake. This should be a part of the travel and publication budget.
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Ella Sieradzki @sieravirus.bsky.social · 04/01/2025
Fungi and isotopes alert! Great paper to start off the new year. www.nature.com/articles/s41...
nature.com
Soil fungi remain active and invest in storage compounds during drought independent of future climate conditions - Nature Communications
How climate change will impact microbial community growth is unclear. Here, the authors use a field experiment with varying global change factors, finding fungal growth more drought-resistant than mic...
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Ella Sieradzki @sieravirus.bsky.social · 03/01/2025
#PhD #position #phage please repost! Recruiting a PhD student!
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Ella Sieradzki @sieravirus.bsky.social · 03/01/2025
Cool! SAR11 phylogenomics and so many new (almost) complete genomes! Wish I could see the sup info for how 16S compares between them. Guess I'll have to be patient... www.biorxiv.org/content/10.1...
biorxiv.org
New isolate genomes and global marine metagenomes resolve ecologically relevant units of SAR11
The bacterial order Pelagibacterales (SAR11) is among the most abundant and widely distributed microbial lineages across the global surface ocean, where it forms an integral component of the marine ca...
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Alex Probst @alexjprobst.bsky.social · 19/12/2024
#PhD #position #alert 2 bioinfo PhD positions @ProbstLab @RESIST_CRC #1 on microbial & epigenetic stress response in rivers tinyurl.com/bdf8eu5a #2 on virus-host stress response in rivers tinyurl.com/43cjd6es (supervision Moraru) Please share!
tinyurl.com
Stellenausschreibung
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