Petr Dvorak
@dvorikus.bsky.social
Associate professor at Palacky University Olomouc focused on the evolution of cyanobacteria and algae. ~2% Neanderthal. Loves cycling and rowing. Formerly a postdoc at Uppsala University (Sweden). Chairman of the Czech Phycological Society.
Huzzaah. A hitchhiker's guide to modern, practical cyanobacterial taxonomy is out onlinelibrary.wiley.com/doi/10.1111/...
#cyanobacteria #taxonomy #phycology #genomics
#cyanobacteria #taxonomy #phycology #genomics
A hitchhiker's guide to modern, practical cyanobacterial taxonomy
There has been an explosion of new Cyanobacterial taxa described within the last two decades. Cyanobacteria exhibit incredible ecological versatility and morphological variability, and thousands of s...
onlinelibrary.wiley.com
November 12, 2025 at 5:23 PM
Huzzaah. A hitchhiker's guide to modern, practical cyanobacterial taxonomy is out onlinelibrary.wiley.com/doi/10.1111/...
#cyanobacteria #taxonomy #phycology #genomics
#cyanobacteria #taxonomy #phycology #genomics
Reposted by Petr Dvorak
Genome maintenance by telomerase is a fundamental process in nearly all eukaryotes. But where does it come from?
Today, we report the discovery of telomerase homologs in a family of antiviral reverse transcriptases, revealing an unexpected evolutionary origin in bacteria.
doi.org/10.1101/2025...
Today, we report the discovery of telomerase homologs in a family of antiviral reverse transcriptases, revealing an unexpected evolutionary origin in bacteria.
doi.org/10.1101/2025...
October 17, 2025 at 12:47 PM
Genome maintenance by telomerase is a fundamental process in nearly all eukaryotes. But where does it come from?
Today, we report the discovery of telomerase homologs in a family of antiviral reverse transcriptases, revealing an unexpected evolutionary origin in bacteria.
doi.org/10.1101/2025...
Today, we report the discovery of telomerase homologs in a family of antiviral reverse transcriptases, revealing an unexpected evolutionary origin in bacteria.
doi.org/10.1101/2025...
Reposted by Petr Dvorak
The hidden toxicity of Pseudanabaena: A notable leap in cyanobacterial research onlinelibrary.wiley.com/doi/10.1111/...
The hidden toxicity of Pseudanabaena: A notable leap in cyanobacterial research
Click on the article title to read more.
onlinelibrary.wiley.com
October 24, 2025 at 11:58 AM
The hidden toxicity of Pseudanabaena: A notable leap in cyanobacterial research onlinelibrary.wiley.com/doi/10.1111/...
Reposted by Petr Dvorak
October 24, 2025 at 3:50 AM
Reposted by Petr Dvorak
New preprint reveals bacteria can't just collect all resistance genes like Pokemon cards.
We found mutually exclusive evolutionary pathways to multidrug resistance in E. coli & P. aeruginosa - some resistance mechanisms actively prevent others from coexisting www.biorxiv.org/content/10.1...
We found mutually exclusive evolutionary pathways to multidrug resistance in E. coli & P. aeruginosa - some resistance mechanisms actively prevent others from coexisting www.biorxiv.org/content/10.1...
Genomic constraints shape the evolution of alternative routes to drug resistance in prokaryotes
Background Variation within the prokaryotic pangenome is not random, and natural selection that favours particular combinations of genes appears to dominate over random drift. What is less clear is wh...
www.biorxiv.org
August 29, 2025 at 2:05 PM
New preprint reveals bacteria can't just collect all resistance genes like Pokemon cards.
We found mutually exclusive evolutionary pathways to multidrug resistance in E. coli & P. aeruginosa - some resistance mechanisms actively prevent others from coexisting www.biorxiv.org/content/10.1...
We found mutually exclusive evolutionary pathways to multidrug resistance in E. coli & P. aeruginosa - some resistance mechanisms actively prevent others from coexisting www.biorxiv.org/content/10.1...
Reposted by Petr Dvorak
What can #herbarium collections tell us about genetic responses to global change? A lot!! 🌿
Check out our viewpoint, out now in @newphyt.bsky.social - genetic monitoring, extinctions, adaptation, GEAs, and more! ⬇️
doi.org/10.1111/nph....
Check out our viewpoint, out now in @newphyt.bsky.social - genetic monitoring, extinctions, adaptation, GEAs, and more! ⬇️
doi.org/10.1111/nph....
Using herbarium collections to study genetic responses to global change
Earth's c. 406 million herbarium specimens represent a largely untapped resource of genetic data that could transform our understanding of global plant populations. Advances in DNA sequencing have ma...
doi.org
August 11, 2025 at 12:26 PM
What can #herbarium collections tell us about genetic responses to global change? A lot!! 🌿
Check out our viewpoint, out now in @newphyt.bsky.social - genetic monitoring, extinctions, adaptation, GEAs, and more! ⬇️
doi.org/10.1111/nph....
Check out our viewpoint, out now in @newphyt.bsky.social - genetic monitoring, extinctions, adaptation, GEAs, and more! ⬇️
doi.org/10.1111/nph....
Reposted by Petr Dvorak
Biofilm formation and dynamics in the marine cyanobacterium Prochlorococcus www.biorxiv.org/content/10.1... #jcampubs
August 11, 2025 at 2:26 PM
Biofilm formation and dynamics in the marine cyanobacterium Prochlorococcus www.biorxiv.org/content/10.1... #jcampubs
Reposted by Petr Dvorak
The supraglacial meltwater ponds of the #McMurdo Ice Shelf, analogues for proposed #Cryogenian period eukaryotic refugia, are shown to host diverse and varied eukaryotic communities.
www.nature.com/articles/s41...
www.nature.com/articles/s41...
Biosignatures of diverse eukaryotic life from a Snowball Earth analogue environment in Antarctica - Nature Communications
The supraglacial meltwater ponds of the McMurdo Ice Shelf, analogues for proposed Cryogenian period eukaryotic refugia, are shown to host diverse and varied eukaryotic communities.
www.nature.com
June 24, 2025 at 6:38 PM
The supraglacial meltwater ponds of the #McMurdo Ice Shelf, analogues for proposed #Cryogenian period eukaryotic refugia, are shown to host diverse and varied eukaryotic communities.
www.nature.com/articles/s41...
www.nature.com/articles/s41...
Reposted by Petr Dvorak
🧑🚀💫Our July issue is now live! Read it here ⬇️
nature.com/nrmicro/volumes/23/issues/7
Inside:
🛰️Phage satellites
🧬Mobile genetic element interactions and evolution in bacteria
💊Bacterial metabolism and antimicrobial resistance
🎯SARS-CoV-2 spike
...and more!
nature.com/nrmicro/volumes/23/issues/7
Inside:
🛰️Phage satellites
🧬Mobile genetic element interactions and evolution in bacteria
💊Bacterial metabolism and antimicrobial resistance
🎯SARS-CoV-2 spike
...and more!
June 18, 2025 at 10:25 PM
🧑🚀💫Our July issue is now live! Read it here ⬇️
nature.com/nrmicro/volumes/23/issues/7
Inside:
🛰️Phage satellites
🧬Mobile genetic element interactions and evolution in bacteria
💊Bacterial metabolism and antimicrobial resistance
🎯SARS-CoV-2 spike
...and more!
nature.com/nrmicro/volumes/23/issues/7
Inside:
🛰️Phage satellites
🧬Mobile genetic element interactions and evolution in bacteria
💊Bacterial metabolism and antimicrobial resistance
🎯SARS-CoV-2 spike
...and more!
Reposted by Petr Dvorak
Dating the evolution of oxygenic photosynthesis using La-Ce geochronology www.nature.com/articles/s41...
Dating the evolution of oxygenic photosynthesis using La-Ce geochronology - Nature
138La-138Ce geochronology shows that La/Ce fractionation, and Ce oxidation, occurred at the time of deposition, placing the origin of oxygenic photosynthesis in the Mesoarchaean or earlier.
www.nature.com
June 12, 2025 at 10:10 AM
Dating the evolution of oxygenic photosynthesis using La-Ce geochronology www.nature.com/articles/s41...
Reposted by Petr Dvorak
Check out BASys2: advanced bacterial genome annotation, 800% faster upgrades! 대launched 20 years post-BASys, leveraging new tech & algorithms. PMID:40308209, Nucleic Acids Res 2025, @NAR_Open https://doi.org/10.1093/nar/gkaf360 #Medsky #Pharmsky #RNA #ASHG #ESHG 🧪
https://doi.org/10.1093/nar/gkaf360
No description available
doi.org
May 4, 2025 at 9:10 AM
Reposted by Petr Dvorak
Cyanobacterial Argonautes and Cas4 family nucleases cooperate to interfere with invading DNA: Molecular Cell https://www.cell.com/molecular-cell/fulltext/S1097-2765(25)00302-8?rss=yes
Cyanobacterial Argonautes and Cas4 family nucleases cooperate to interfere with invading DNA
Bobadilla Ugarte et al. have functionally, structurally, and biochemically characterized cyanobacterial APACE1 immune systems. In APACE1 systems, a pAgo protein mediates small DNA-guided DNA interference, whereas ACE1 contributes to guide DNA processing. This study broadens our mechanistic understanding of how diversified pAgo systems protect their bacterial hosts against invading DNA.
www.cell.com
April 26, 2025 at 9:23 AM
Cyanobacterial Argonautes and Cas4 family nucleases cooperate to interfere with invading DNA: Molecular Cell https://www.cell.com/molecular-cell/fulltext/S1097-2765(25)00302-8?rss=yes
Reposted by Petr Dvorak
Several research institutes in Germany are joining a worldwide grassroots effort to save science data sets that researchers fear could be deleted by US President Donald Trump’s administration, Nature has learnt.
https://go.nature.com/42uEw50
https://go.nature.com/42uEw50
Major European institutes join race to save US science data
As the administration of US President Donald Trump slashes budgets, crucial climate and other data sets could disappear.
go.nature.com
April 24, 2025 at 9:17 PM
Several research institutes in Germany are joining a worldwide grassroots effort to save science data sets that researchers fear could be deleted by US President Donald Trump’s administration, Nature has learnt.
https://go.nature.com/42uEw50
https://go.nature.com/42uEw50
Reposted by Petr Dvorak
Annotation of 200 insect genomes. Work driven by @stepbystepsolution.bsky.social and Mario Stanke within @gevol.bsky.social : www.biorxiv.org/content/10.1...
Annotation of 200 Insect Genomes with BRAKER for Consistent Comparisons across Species
The annotation of genomes lags behind their sequencing and assembly. For example, of 5,092 insect species in GenBank, as one of the most widely used databases, only 375 currently have annotated genome...
www.biorxiv.org
April 21, 2025 at 5:37 AM
Annotation of 200 insect genomes. Work driven by @stepbystepsolution.bsky.social and Mario Stanke within @gevol.bsky.social : www.biorxiv.org/content/10.1...
Reposted by Petr Dvorak
A paper published in @currentbiology.bsky.social by @scaralbi.bsky.social and colleagues in the Howe Group adds significantly to our understanding of bacterial evolution by showing how #cyanobacteria can rapidly develop resistance to a #herbicide. Read more: www.bioc.cam.ac.uk/news/howe-gr...
March 25, 2025 at 2:56 PM
A paper published in @currentbiology.bsky.social by @scaralbi.bsky.social and colleagues in the Howe Group adds significantly to our understanding of bacterial evolution by showing how #cyanobacteria can rapidly develop resistance to a #herbicide. Read more: www.bioc.cam.ac.uk/news/howe-gr...
Reposted by Petr Dvorak
Uncalled4: a toolkit for nanopore signal alignment, analysis and visualization of DNA and RNA modifications.
www.nature.com/articles/s41...
www.nature.com/articles/s41...
March 28, 2025 at 5:23 PM
Uncalled4: a toolkit for nanopore signal alignment, analysis and visualization of DNA and RNA modifications.
www.nature.com/articles/s41...
www.nature.com/articles/s41...
Reposted by Petr Dvorak
A paper in Nature Genetics presents evidence for an extended period of structure in the history of all modern humans, in which two ancestral populations that diverged 1.5 million years ago came together in an admixture event 300 thousand years ago. https://go.nature.com/3RisxRp 🏺 🧬 🧪
March 21, 2025 at 1:18 PM
A paper in Nature Genetics presents evidence for an extended period of structure in the history of all modern humans, in which two ancestral populations that diverged 1.5 million years ago came together in an admixture event 300 thousand years ago. https://go.nature.com/3RisxRp 🏺 🧬 🧪
Reposted by Petr Dvorak
Join us in at #ESEB2025 Barcelona for our symposium on microbial adaptation to changing conditions. Organised by @mtoll8.bsky.social @javierdelafuente.bsky.social and me. Amazing invited speakers @saramitri.bsky.social and Itzik Mizrahi!! @eseb2025.bsky.social
March 13, 2025 at 5:30 PM
Join us in at #ESEB2025 Barcelona for our symposium on microbial adaptation to changing conditions. Organised by @mtoll8.bsky.social @javierdelafuente.bsky.social and me. Amazing invited speakers @saramitri.bsky.social and Itzik Mizrahi!! @eseb2025.bsky.social
Reposted by Petr Dvorak
Given the discussion today. #EthicalPublishing is possible.
Our ethos for many years now:
1. All papers preprinted along with data.
2. No commercial publishers.
3. Only publish in scientific society journals and with reputable non-profit publishers.
4. Collaborators do what they want.
Our ethos for many years now:
1. All papers preprinted along with data.
2. No commercial publishers.
3. Only publish in scientific society journals and with reputable non-profit publishers.
4. Collaborators do what they want.
Society journals vs. #NatureRipoffs @manavellalab @ASPB @NaturePlants
February 24, 2025 at 6:45 PM
Given the discussion today. #EthicalPublishing is possible.
Our ethos for many years now:
1. All papers preprinted along with data.
2. No commercial publishers.
3. Only publish in scientific society journals and with reputable non-profit publishers.
4. Collaborators do what they want.
Our ethos for many years now:
1. All papers preprinted along with data.
2. No commercial publishers.
3. Only publish in scientific society journals and with reputable non-profit publishers.
4. Collaborators do what they want.
Reposted by Petr Dvorak
We did it! We caught Starship #transposons moving between #fungal species in the lab, including between species separated by ~100my. We think Starships are a mediator of HGT in fungi, akin to conjugative elements in bacteria. Check out the preprint. www.biorxiv.org/content/10.1...
March 7, 2025 at 7:18 AM
We did it! We caught Starship #transposons moving between #fungal species in the lab, including between species separated by ~100my. We think Starships are a mediator of HGT in fungi, akin to conjugative elements in bacteria. Check out the preprint. www.biorxiv.org/content/10.1...
Reposted by Petr Dvorak
Telomeric transposons are pervasive in linear bacterial genomes | Science www.science.org/doi/10.1126/...
Telomeric transposons are pervasive in linear bacterial genomes
Eukaryotes have linear DNA and their telomeres are hotspots for transposons, which in some cases took over telomere maintenance. Here we identify several families of independently evolved telomeric tr...
www.science.org
March 6, 2025 at 8:42 PM
Telomeric transposons are pervasive in linear bacterial genomes | Science www.science.org/doi/10.1126/...
Reposted by Petr Dvorak
An issue with length limits of sequence headers has now been resolved in OrthoHMM v 0.1.1 🥳
bsky.app/profile/jlst...
bsky.app/profile/jlst...
OrthoHMM v0.1.0 now handles the all-by-all search step differently by enabling better multiprocessing.
Now, multiple search commands can be executed in one step :)
github.com/JLSteenwyk/o...
bsky.app/profile/jlst...
Now, multiple search commands can be executed in one step :)
github.com/JLSteenwyk/o...
bsky.app/profile/jlst...
March 2, 2025 at 6:08 PM
An issue with length limits of sequence headers has now been resolved in OrthoHMM v 0.1.1 🥳
bsky.app/profile/jlst...
bsky.app/profile/jlst...
Reposted by Petr Dvorak
Conservation funding “82.9% was assigned to vertebrates. … while fungi and algae were barely represented at less than 0.2%”
Proud to work towards conservation of #AquaticFungi — tiny but mighty!
www.theguardian.com/environment/...
Proud to work towards conservation of #AquaticFungi — tiny but mighty!
www.theguardian.com/environment/...
Most conservation funds go to large vertebrates at expense of ‘neglected’ species
Study shows funding bias towards animals like rhino while other endangered species including amphibians and algae disregarded
www.theguardian.com
February 25, 2025 at 8:24 PM
Conservation funding “82.9% was assigned to vertebrates. … while fungi and algae were barely represented at less than 0.2%”
Proud to work towards conservation of #AquaticFungi — tiny but mighty!
www.theguardian.com/environment/...
Proud to work towards conservation of #AquaticFungi — tiny but mighty!
www.theguardian.com/environment/...
Reposted by Petr Dvorak
Epigenetic variation can impact evolutionary processes. In this Perspective, Mueller et al. discuss the potential for epigenetic mechanisms to be integrated into population genetic practice.
www.nature.com/articles/s41...
www.nature.com/articles/s41...
Epigenetic variation in light of population genetic practice - Nature Communications
Epigenetic variation can impact evolutionary processes to varying extents depending on its transgenerational stability and degree of environmental influence. This Perspective discusses the potential f...
www.nature.com
February 5, 2025 at 5:28 PM
Epigenetic variation can impact evolutionary processes. In this Perspective, Mueller et al. discuss the potential for epigenetic mechanisms to be integrated into population genetic practice.
www.nature.com/articles/s41...
www.nature.com/articles/s41...
Reposted by Petr Dvorak
This Friday, February 7, María del Carmen Muñoz-Marín @vesynech.bsky.social will give a UCO BioResearch Seminar entitled "The social life of marine cyanobacteria".
February 4, 2025 at 2:33 PM
This Friday, February 7, María del Carmen Muñoz-Marín @vesynech.bsky.social will give a UCO BioResearch Seminar entitled "The social life of marine cyanobacteria".