Jeroen Guikema
@jeroenguikema.bsky.social
2.3K followers 1.7K following 33 posts
Molecular biologist. 🧬Principal investigator at University of Amsterdam 🇳🇱 Research interests: immune repertoire diversification mechanisms, oncogenic signaling, B-cells, multiple myeloma #medsky #scisky #academicsky #biosky
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Reposted by Jeroen Guikema
aemonten.bsky.social
"Surprisingly, individual cells—from splenic lymphocytes to pluripotent stem cells—transcribe only ∼0.02%–3.1% of the genome, versus >80% in bulk, revealing limited genome engagement and profound cell-type and cell-to-cell heterogeneity"

www.cell.com/cell/abstrac...
Single-cell nascent transcription reveals sparse genome usage and plasticity
scFLUENT-seq is a single-cell method that sensitively captures nascent nuclear transcriptomes to reveal mRNA and ncRNA dynamics, heterogeneity across chromatin compartments, and transcriptional divers...
www.cell.com
Reposted by Jeroen Guikema
brendelbored.bsky.social
Do you know how badly things have to be going in America for us to be owned this hard by the Dutch? The Dutch of all people
davelee.me
Dutch late night TV has its take
Reposted by Jeroen Guikema
freudlab.bsky.social
Thrilled to share our lab’s latest work in JBC! 🎉 We uncovered a critical role for APE1 Asn174 in stabilizing AP-sites using mutagenesis, enzymology, crystallography, and MD-simulations. Congrats to Kaitlin Dehart and all the co-authors! Check it out: www.jbc.org/article/S002...
APE1 active site residue Asn174 stabilizes the AP-site and is essential for catalysis
Apurinic/Apyrimidinic (AP)-sites are common and highly mutagenic DNA lesions that can arise spontaneously or as intermediates during Base Excision Repair (BER). The enzyme apurinic/apyrimidinic endonu...
www.jbc.org
Reposted by Jeroen Guikema
Reposted by Jeroen Guikema
molbioevol.bsky.social
Pospelova et al. present a comparative analysis of full-length sequences of IG/TR loci across 46 mammalian species, demonstrating these as rapidly evolving genomic regions, with implications for immunogenomics.

🔗 doi.org/10.1093/molbev/msaf152

#evobio #molbio
Pospelova et al. present a comparative analysis of adaptive immune loci across diverse mammalian species, uncovering relationships between locus architecture, characteristics of immune genes, and population dynamics. The artwork illustrates how the structure of immunoglobulin heavy chain loci influences gene variability in three representative species from the study – the mountain lion, the ring-tailed lemur, and European hedgehog.
Reposted by Jeroen Guikema
jeroenguikema.bsky.social
Another tour de force by the Victora lab. A must read for germinal center aficionados. There goes the weekend!
Reposted by Jeroen Guikema
Reposted by Jeroen Guikema
neuralgrndstate.bsky.social
This is what we know about the so-called 'epithelial-mesenchymal transition'

'Lack of basic rationale in epithelial-mesenchymal transition and its related concepts'
cellandbioscience.biomedcentral.com/articles/10....
Reposted by Jeroen Guikema
davidho.bsky.social
I think a lot about what Carl Sagan said in one of his final interviews.
"WE'VE ARRANGED A society based on science and technology, in which nobody understands anything about science technology. And this combustible mixture of ignorance and power, sooner or later, is going to blow up in our faces. Who is running the science and technology in a democracy if the people don't know anything about it?"
"Science is more than a body of knowledge, it's a way of thinking. A way of skeptically interrogating the universe with a fine understanding of human fallibility. If we are not able to ask skeptical questions, to interrogate those who tell us that something is true, to be skeptical of those in authority, then we're up for grabs for the next charlatan, political or religious, who comes ambling along."
Reposted by Jeroen Guikema
nucleosomepolice.bsky.social
And, again, WHERE IS #BIGPHARMA in defending #basicscience? laying low? playing dead? Waiting it out? Do SOMETHING! SPEAK UP! Use your gigantic lobbying machine to defend us instead of peddling your wares and increasing your profits. Or do you think highly trained workforce grows on trees?
Reposted by Jeroen Guikema
johanduchene.bsky.social
Antibodies don't work.

NLRP3 is by far the most studied inflammasome — yet <30% of commercial antibodies were specific.

Only 4 of 14 tested antibodies detected NLRP3 specifically.

Antibodies must be validated before use.

Full report by @ycharos.bsky.social : zenodo.org/records/1162...
Reposted by Jeroen Guikema
nizet.bsky.social
B͓̊å͓c͓̊t͓̊e͓̊r͓̊i͓̊å͓l͓̊ s͓̊ů͓g͓̊å͓r͓̊ f͓̊ů͓e͓̊l͓̊s͓̊
c͓̊å͓n͓̊c͓̊e͓̊r͓̊ r͓̊i͓̊s͓̊k͓̊

Study in 𝘕𝘢𝘵𝘶𝘳𝘦 finds ADP-HEPTOSE, a bacterial sugar produced by Gram- gut flora, leaks into the bloodstream with age, activating NF-κB, giving pre-leukaemic blood cells a growth edge, and triggering dangerous clonal haematopoiesis

Starczynowski Lab U Cincinnati
Microbial metabolite drives ageing-related clonal haematopoiesis via ALPK1 - Nature
ADP-heptose binds to ALPK1, triggering transcriptional reprogramming and NF-κB activation, endowing pre-leukaemic cells with a competitive advantage due to excessive clonal proliferation.
www.nature.com
Reposted by Jeroen Guikema
Reposted by Jeroen Guikema
kaiamattioli.bsky.social
our work on the molecular differences between transcription factor isoforms is out now in Molecular Cell!

key point: 2/3rds of TF isos differ in properties like DNA binding & transcriptional activity

many are "negative regulators" & misexpressed in cancer

www.sciencedirect.com/science/arti...
Reposted by Jeroen Guikema
marcveld.bsky.social
Freedom of speech? Don't travel to the US, it is not save

French scientist denied US entry after phone messages critical of Trump found

France’s research minister said the scientist was traveling to Houston for a conference when his phone was searched

www.theguardian.com/...
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French scientist denied US entry after phone messages critical of Trump found
France’s research minister said the scientist was traveling to Houston for a conference when his phone was searched
www.theguardian.com
jeroenguikema.bsky.social
This is beyond stupid, already extensively debunked and based on a fraudulent study. What would yet another study do when they are not interested in facts to begin with??
jeroenguikema.bsky.social
How a small country can even be smaller: PVV MPs applauding the attack of Zelensky by Trump and Vance. This bunch is not to be trusted, their conviction lies with Russia. Let’s call them what they are: TRAITORS. Please pull the plug on this coalition. www.brusselstimes.com/1467549/pvv-...
PVV leader Wilders stands behind Ukraine 'with conviction'
Dutch leader Geert Wilders supports Zelensky amidst US-Ukraine clash; calls anti-Trump sentiment unproductive.
www.brusselstimes.com