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Petr Cejka

@cejkalab.bsky.social
994 followers 379 following 46 posts

Research group leader. Interested in DNA repair.

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Petr Cejka @cejkalab.bsky.social · 14/08/2026
I am happy to share our latest paper on human PIF1, a wonderful collaboration with Raphael Guerois, Ralf Seidel and Ulrich Rass and their teams. Human PIF1 is quite different from its yeast counterpart. Congratulations to Akshay Jayachandran, the first author. genesdev.cshlp.org/content/earl...
genesdev.cshlp.org
Human PIF1 clears secondary DNA structures by coupled DNA unwinding and rewinding activities
A biweekly scientific journal publishing high-quality research in molecular biology and genetics, cancer biology, biochemistry, and related fields
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Fusion Conferences @fusionconf.bsky.social · 27/07/2026
Delighted to announce #RecombMechanisms is back for its 3rd edition next July! This conference will bring together leaders in the fields of DNA recombination (mitotic & meiotic), repair, replication, transcription, epigenetics, and cancer biology. Sign up for updates now➡️https://bit.ly/4pFcLAq
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Petr Cejka @cejkalab.bsky.social · 26/05/2026
Val di Mello and Preda Rossa in Valtellina, Italy
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Petr Cejka @cejkalab.bsky.social · 20/05/2026
Happy to share our collaborative project with Stephane Marcand, on the protective role of Rap1 at telomeres. It turned out that our favorite protein, MRX, has the ability to measure telomere length, and activate response pathways when telomeres become too short. www.nature.com/articles/s41...
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Petr Cejka @cejkalab.bsky.social · 13/05/2026
Interesting paper from Virginie Ropars and collegues about the architecture of WRN and KU interaction. Interestingly, WRN binds on the internal (end-distal) side of KU. Thanks for this interesting collaboration! @pietropichierri.bsky.social www.nature.com/articles/s41...
nature.com
Structural basis of Ku-mediated activation of WRN exonuclease activity - Nature Communications
The WRN helicase helps to protect stalled DNA replication forks during replication stress, but its activation mechanism remains unclear. Here, the authors demonstrate that Ku binds and stimulates WRN ...
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Petr Cejka @cejkalab.bsky.social · 25/04/2026
After a week-long meeting and excellent science in the Netherlands, it is nice to be back in the mountains.
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Alberto Ciccia @albertociccia.bsky.social · 17/02/2026
Happy to share our new pre-print on the dependency of ALT-positive tumors on the DNA translocase SMARCAL1. Outstanding work of @angelotaglialatela.bsky.social in collaboration with the Min, Lazzerini Denchi and @cejkalab.bsky.social laboratories! www.biorxiv.org/content/10.6...
biorxiv.org
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Petr Cejka @cejkalab.bsky.social · 08/02/2026
Sea of clouds is over central Switzerland today
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Kumar Somyajit & Lab @ksomyajit.bsky.social · 29/01/2026
Dear Colleagues, Delighted to share that our first lab paper is now published in Nature.!!! 😊😊😊 We identify a previously concealed “safety limit” in DNA replication program: cells intrinsically rate-limit PCNA via PAF15, shaping strand-specific and global replication dynamics. 👉 rdcu.be/e1bBt
rdcu.be
PAF15–PCNA exhaustion governs the strand-specific control of DNA replication
Nature - PCNA–PAF15 has a key role in determining replisome dynamics during genome replication and protecting against genome instability.
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Petr Cejka @cejkalab.bsky.social · 18/01/2026
Middle of January in central Switzerland, but very little snow. More for hiking than skiing…
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stapleslab.bsky.social @stapleslab.bsky.social · 08/01/2026
New paper in collaboration with @unterholznerlab.bsky.social @cejkalab.bsky.social IFI16 protects stalled replication forks. www.sciencedirect.com/science/arti...
sciencedirect.com
IFI16 senses and protects stalled replication forks
Replication stress is a key driver of DNA damage and genome instability. Here, we report that replication stress induces an inflammatory response in t…
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Unterholzner Lab @unterholznerlab.bsky.social · 08/01/2026
We've got a new paper out! In collaboration with @stapleslab.bsky.social @cejkalab.bsky.social @lucyhjackson-j.bsky.social, we show that IFI16 binds to stalled replication forks, protects nascent DNA and mediates an inflammatory response to replication stress. authors.elsevier.com/sd/article/S...
authors.elsevier.com
ScienceDirect.com | Science, health and medical journals, full text articles and books.
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Aura Carreira @acarreiralab.bsky.social · 10/12/2025
🚨 Exciting news! Our latest study is out in Nature Communications! We reveal how specific BRCA2 mutations can hijack transcriptional programs—beyond their role in DNA repair. 🔗 rdcu.be/eT1R9 #CancerResearch #BRCA2 #Genomics
nature.com
A recurrent pathogenic BRCA2 truncating variant reveals a role for BRCA2-PCAF complex in modulating NF-κB-driven transcription - Nature Communications
Pathogenic BRCA2 truncating variants in heterozygosis drive distinct cancer-linked mechanisms. Here the authors show that one causes PARPi sensitivity and HR loss via haploinsufficiency, while another...
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Edwin Antony @professorantony.bsky.social · 10/12/2025
What does phosphorylation do to RPA? This has been a long-standing question in the field of genome integrity. In our newest publication in Nature Communications rdcu.be/eT4z3 with @proforiganti.bsky.social , we reveal the answer. Thanks to funding from NIGMS to our groups.
media.tenor.com
a man is sitting on a couch with his arms outstretched and making a funny face .
ALT: a man is sitting on a couch with his arms outstretched and making a funny face .
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Petr Cejka @cejkalab.bsky.social · 29/11/2025
Late fall impressions from Lugano lake.
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Edwin Antony @professorantony.bsky.social · 18/11/2025
POSTDOCTORAL POSITION IN STRUCTURAL BIOLOGY We need a structural biologist to work on several CryoEM datasets. For more information, please visit: www.antonylab.org Expertise in structure refinement and model-building are required. Please share.
antonylab.org
ANTONY LAB SAINT LOUIS UNIVERSITY SCHOOL OF MEDICINE
Edwin Antony Lab Website
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Petr Cejka @cejkalab.bsky.social · 08/11/2025
November magic in Graubünden
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Petr Cejka @cejkalab.bsky.social · 30/10/2025
Among the anti-recombinases, FIGNL1 rules them all. So much that inactivating it brings BRCA2-deficient cells to life. Who is responsible for RAD51 loading without BRCA2/FIGNL1, check out the paper to find out! Great collaboration with @raychaudhurilab.bsky.social www.science.org/doi/10.1126/...
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Petr Cejka @cejkalab.bsky.social · 27/10/2025
See our paper “Mechanism of trinucleotide repeat expansion by MutSβ-MutLγ and contraction by FAN1”. Using biochemistry, we show how DNA incisions by the MutLγ nuclease can lead to expansions, and how expansion is prevented by FAN1. Well done Issam and Valentina! www.nature.com/articles/s41...
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Petr Cejka @cejkalab.bsky.social · 26/10/2025
Lake Como with plenty of fall sunshine today
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Petr Cejka @cejkalab.bsky.social · 18/10/2025
Golden October in its glory. Mountains in Ticino today.
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Petr Cejka @cejkalab.bsky.social · 20/09/2025
Trip to Greina plateau, northern Ticino
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Petr Cejka @cejkalab.bsky.social · 31/08/2025
Last hike in August with first snow
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Daniel Durocher @durocher1.bsky.social · 28/08/2025
JOB ALERT 🚨 We are hiring TWO principal investigators in cell, molecular, systems, or chemical biology in Toronto, Canada at @sinaihealth.bsky.social. We provide a generous startup, fully funded salary and academic appointment at U of Toronto. www.nature.com/naturecareer... Please repost!
Image of Toronto
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Petr Cejka @cejkalab.bsky.social · 31/05/2025
Hiking in Switzerland today, Val Poschiavo
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Petr Cejka @cejkalab.bsky.social · 05/05/2025
Please see our latest paper on the role of EXO1 in meiosis: "EXO1 promotes the meiotic MLH1-MLH3 endonuclease through conserved interactions with MLH1, MSH4 and DNA". Congratulations to both first authors, Megha Roy and Aurore Sanchez and thanks to all our collaborators!
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Petr Cejka @cejkalab.bsky.social · 01/05/2025
Southern Alps today
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Andrew Deans @genomestability.bsky.social · 29/04/2025
🧬 New research discovers sequential phosphorylation of MRE11 by ATM and ATR prevents extensive DNA degradation at stalled replication forks www.pnas.org/doi/abs/10.1...
pnas.org
ATM priming and end resection–coupled phosphorylation of MRE11 is important for fork protection and replication restart | PNAS
The MRE11/RAD50/NBS1 (MRN) complex plays multiple roles in the maintenance of genome stability. MRN is associated with replication forks to preserv...
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Petr Cejka @cejkalab.bsky.social · 11/04/2025
Nice weekend everyone from sunny Bellinzona
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Petr Cejka @cejkalab.bsky.social · 10/04/2025
Great news, thank you
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stapleslab.bsky.social @stapleslab.bsky.social · 09/04/2025
New preprint from the lab, revealing new roles for IFI16 during replication stress. Great collab with @unterholznerlab.bsky.social and @cejkalab.bsky.social www.biorxiv.org/content/10.1...
biorxiv.org
IFI16 senses and protects stalled replication forks
Replication stress is a key driver of DNA damage and genome instability. Replication stress-induced fork remodelling generates a new DNA end that is vulnerable to the action of nucleases, and which is...
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Petr Cejka @cejkalab.bsky.social · 05/04/2025
Spring is here. Valleys and lakesides are green, and snow is melting fast in the mountains.
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Nature Reviews Molecular Cell Biology @natrevmcb.nature.com · 04/04/2025
ICYMI - New #Review on #DNARepair In this Review, Raphael Ceccaldi and @cejkalab.bsky.social discuss the mechanisms and regulation of DNA-end resection, which is crucial for the repair of DNA double-strand breaks by most repair pathways. 🔗 go.nature.com/4iSKphQ
go.nature.com
Mechanisms and regulation of DNA end resection in the maintenance of genome stability - Nature Reviews Molecular Cell Biology
DNA end resection is crucial for most DNA double-strand break repair pathways. This Review discusses the molecular mechanisms of end resection and its regulation, focusing on the roles of post-transla...
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Petr Cejka @cejkalab.bsky.social · 26/03/2025
An interesting collaboration with the @vindignilab.bsky.social on the mechanism of resection at gaps. Spoiler alert: the MRE11 complex acts very differently at gaps vs. at DNA breaks genesdev.cshlp.org/content/earl...
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Petr Cejka @cejkalab.bsky.social · 25/03/2025
Check out our review on DNA end resection! With Raphael Ceccaldi, www.nature.com/articles/s41...
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Lopes_Lab @lopeslab.bsky.social · 17/03/2025
Exciting seminar series from Genome integrity italian Network (GiiN), chaired by myself and Raffaella Di Micco! Short talks (2x30’), at convenient time for EU/USA attendees. Big shots and raising stars in an expanding field. See flyers + link to receive email alerts. Please repost to your network!👇
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Hopfner Lab @hopfnerlab.bsky.social · 17/03/2025
Happy to share our latest pre-print! We solved the cryoEM structures of human DNA repair factor MRN bound to DNA and to TRF2. Main work of Yilan, Filiz @filizkuybu.bsky.social and Hengjun. Great collab within the @sfb1361.bsky.social and @genecenter-lmu.bsky.social 🧬🔨 www.biorxiv.org/content/10.1...
biorxiv.org
Structural basis for DNA double-strand break sensing by human MRE11-RAD50-NBS1 and its TRF2 complex
The MRE11-RAD50-NBS1 (MRN) complex is a central, multifunctional factor in the detection, signaling and nucleolytic processing of DNA double-strand breaks (DSBs). To clarify how human MRN binds generi...
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Agnel Sfeir @agnelsfeir.bsky.social · 05/03/2025
If you are interested in mitochondria, Nashville is the place to be June 1-5. Check out this FASEB meeting. Please RT. events.faseb.org/event/mitoch...
events.faseb.org
Mechanisms of Mitochondrial DNA Mutation and Repair
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Petr Cejka @cejkalab.bsky.social · 28/02/2025
Very sad to read about the science funding situation in the US at the moment. I am waiting for some funding decisions in the coming weeks, but I will likely have opening(s) in my lab in Switzerland in the coming weeks (PhD student/postdoc). As a PhD candidate, you need to have a Master's degree.
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Jacob Corn @jcornlab.bsky.social · 12/02/2025
New #preprint from the lab! Do you want to see the invisible? So did we! When DNA genomes get broken, cells somehow find related sequences to fix the break. But how do they find it? We developed a way to look at sequence *search*, not just sequence usage. doi.org/10.1101/2025...
doi.org
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Petr Cejka @cejkalab.bsky.social · 15/02/2025
Como Lake in winter
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Petr Cejka @cejkalab.bsky.social · 20/01/2025
Looking forward to visiting my colleagues at Columbia, Rockefeller and MSK. Last time when i landed in the US, it was July in Phoenix with a temperature of 46C. It will be -17C in the night in New York. On average, perfect temperature, but this is why we need to plot individual data points!
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Petr Cejka @cejkalab.bsky.social · 16/12/2024
I was great to host Alessandro Vindigni @vindignilab.bsky.social in Bellinzona. We are excited about our collaborations!
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Petr Cejka @cejkalab.bsky.social · 16/12/2024
A new research building coming to Bellinzona! www.laregione.ch/cantone/bell...
laregione.ch
Uno dei massimi esperti progetterà la sede Ior di Bellinzona
Il Consiglio di fondazione ha scelto il team di consorzio Isb+ composto dallo studio Santer Architekten di Zurigo e dal locarnese Francesco Buzzi
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Petr Cejka @cejkalab.bsky.social · 05/12/2024
The Cejka lab holiday dinner yesterday
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Petr Cejka @cejkalab.bsky.social · 20/11/2024
Interesting!
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Petr Cejka @cejkalab.bsky.social · 17/11/2024
Amazing weather in the mountains of Ticino continues!
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Petr Cejka @cejkalab.bsky.social · 15/11/2024
All seems to work well here, except that the confirmation e-mail from bsky was filtered away and never arrived to my institute e-mail. I used Gmail instead ...
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Petr Cejka @cejkalab.bsky.social · 13/11/2024
My first post here, completely non-scientific, photos from a hike last weekend. I hope to reconnect with as as many of you as possible! Anyone wants to move to Switzerland these days?
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