DEEMteam_Orsay
@deemteam.bsky.social
Diversity, Ecology and Evolution of Microbes (DEEM) team. Posts by David Moreira. #treeoflife #evolution
Paris, France
https://www.deemteam.fr/en/
Paris, France
https://www.deemteam.fr/en/
This paper has been a must! Great collaboration with @mkrupovic.bsky.social and @yifanzhou.bsky.social, a N&V by a legend of halophilic archaea tinyurl.com/yc3dcv72, and one picture of one of our expeditions to Dallol making the cover of the November issue of @natmicrobiol.nature.com
rdcu.be/eLtCH
rdcu.be/eLtCH
November 2, 2025 at 5:52 PM
This paper has been a must! Great collaboration with @mkrupovic.bsky.social and @yifanzhou.bsky.social, a N&V by a legend of halophilic archaea tinyurl.com/yc3dcv72, and one picture of one of our expeditions to Dallol making the cover of the November issue of @natmicrobiol.nature.com
rdcu.be/eLtCH
rdcu.be/eLtCH
A proposal for journal accreditation systems to counter predatory practices. If funding agencies enforced these accreditations, predatory journals would quickly vanish.
doi.org/10.1093/fems...
doi.org/10.1093/fems...
October 12, 2025 at 5:15 PM
A proposal for journal accreditation systems to counter predatory practices. If funding agencies enforced these accreditations, predatory journals would quickly vanish.
doi.org/10.1093/fems...
doi.org/10.1093/fems...
Enjoying the mountains that forams built for us (with some help from plate tectonics) long ago.
August 31, 2025 at 4:16 PM
Enjoying the mountains that forams built for us (with some help from plate tectonics) long ago.
In our ongoing saga of description of new protists, we are happy to introduce Multisulcus malaysiensis, a deep-branching heterolobosean that forms highly unusual multiflagellated cells with multiple ventral grooves. Great work by @kristina-prokina.bsky.social
onlinelibrary.wiley.com/doi/epdf/10....
onlinelibrary.wiley.com/doi/epdf/10....
August 7, 2025 at 12:26 PM
In our ongoing saga of description of new protists, we are happy to introduce Multisulcus malaysiensis, a deep-branching heterolobosean that forms highly unusual multiflagellated cells with multiple ventral grooves. Great work by @kristina-prokina.bsky.social
onlinelibrary.wiley.com/doi/epdf/10....
onlinelibrary.wiley.com/doi/epdf/10....
Check out our paper to explore how the evolutionary history of SELMA supports or challenges various hypotheses on the origin of red complex plastids.
academic.oup.com/mbe/article/...
academic.oup.com/mbe/article/...
July 23, 2025 at 8:43 AM
Check out our paper to explore how the evolutionary history of SELMA supports or challenges various hypotheses on the origin of red complex plastids.
academic.oup.com/mbe/article/...
academic.oup.com/mbe/article/...
Some ceramic protists from our talented friend Anabel López-Archilla. Do you recognize them?
July 15, 2025 at 2:39 PM
Some ceramic protists from our talented friend Anabel López-Archilla. Do you recognize them?
We are very happy to welcome Benjy Sedano @bencyano7.bsky.social , our new PhD student who will be working with some of our favorite cyanobacteria!
July 1, 2025 at 1:09 PM
We are very happy to welcome Benjy Sedano @bencyano7.bsky.social , our new PhD student who will be working with some of our favorite cyanobacteria!
We have contributed to a paper led by Kenneth Timmis on the murky world of predatory journals:
enviromicro-journals.onlinelibrary.wiley.com/doi/10.1111/...
enviromicro-journals.onlinelibrary.wiley.com/doi/10.1111/...
June 20, 2025 at 10:52 AM
We have contributed to a paper led by Kenneth Timmis on the murky world of predatory journals:
enviromicro-journals.onlinelibrary.wiley.com/doi/10.1111/...
enviromicro-journals.onlinelibrary.wiley.com/doi/10.1111/...
Finally, using a model that accounts for the sequence compositional, we found that DPANN most likely branch within Euryarchaeota. Interestingly, DPANN share more protein-coding genes with eurys than with other archaea. Therefore, they appear to constitute a highly derived lineage of Euryarchaeota.
June 17, 2025 at 12:35 PM
Finally, using a model that accounts for the sequence compositional, we found that DPANN most likely branch within Euryarchaeota. Interestingly, DPANN share more protein-coding genes with eurys than with other archaea. Therefore, they appear to constitute a highly derived lineage of Euryarchaeota.
We also found that ribosomal proteins, commonly used to reconstruct the phylogeny of archaea, are extremely biased in their amino acid composition compared to that of the complete proteomes, calling into question the suitability of using them as phylogenetic markers.
June 17, 2025 at 12:35 PM
We also found that ribosomal proteins, commonly used to reconstruct the phylogeny of archaea, are extremely biased in their amino acid composition compared to that of the complete proteomes, calling into question the suitability of using them as phylogenetic markers.
Using various approaches to overcome sequence compositional bias and the high evolutionary rates of DPANN, we found strong support for their monophyly. Altiarchaeota, which may contain free-living species, forms the first branch to diverge within DPANN.
June 17, 2025 at 12:35 PM
Using various approaches to overcome sequence compositional bias and the high evolutionary rates of DPANN, we found strong support for their monophyly. Altiarchaeota, which may contain free-living species, forms the first branch to diverge within DPANN.
Well, all around the world, scientific institutions organize events with more or less fancy ceremonial attire, which has nothing to do with religion.
June 5, 2025 at 12:51 PM
Well, all around the world, scientific institutions organize events with more or less fancy ceremonial attire, which has nothing to do with religion.
Puri giving a short speech yesterday at the French Academy of Sciences to acknowledge her nomination as a new member. The fancy Napoleonic-style attire is part of the official Academy's protocol.
@academiesciences.bsky.social
@academiesciences.bsky.social
June 4, 2025 at 3:16 PM
Puri giving a short speech yesterday at the French Academy of Sciences to acknowledge her nomination as a new member. The fancy Napoleonic-style attire is part of the official Academy's protocol.
@academiesciences.bsky.social
@academiesciences.bsky.social
Our friends of atacamensis.cl have just published this short video about our fieldtrip to the Atacama Desert in March.
May 24, 2025 at 6:24 PM
Our friends of atacamensis.cl have just published this short video about our fieldtrip to the Atacama Desert in March.
Some surprising statements too. Multimarker concatenations were used well before that paper (concatenated mitochondrial markers for animal phylogeny; other markers for bacterial and eukaryotic phylogeny, etc.):
1989: doi.org/10.1093/oxfo...
1994: doi.org/10.1016/0923...
1996: doi.org/10.1038/3815...
1989: doi.org/10.1093/oxfo...
1994: doi.org/10.1016/0923...
1996: doi.org/10.1038/3815...
May 9, 2025 at 1:05 PM
Some surprising statements too. Multimarker concatenations were used well before that paper (concatenated mitochondrial markers for animal phylogeny; other markers for bacterial and eukaryotic phylogeny, etc.):
1989: doi.org/10.1093/oxfo...
1994: doi.org/10.1016/0923...
1996: doi.org/10.1038/3815...
1989: doi.org/10.1093/oxfo...
1994: doi.org/10.1016/0923...
1996: doi.org/10.1038/3815...
This one is fantastic:
April 28, 2025 at 12:26 PM
This one is fantastic:
Some volcanoes reflected in the turquoise waters of Laguna Brava.
April 9, 2025 at 2:48 PM
Some volcanoes reflected in the turquoise waters of Laguna Brava.
Working in another world: Salar de Carcote
April 1, 2025 at 9:16 AM
Working in another world: Salar de Carcote
These arid evaporitic landscapes of the Atacama Desert are often referred to as "Mars analogues" (probably with excessive optimism). Yet, one only has to turn over the salt crust to discover colorful microbial life.
March 27, 2025 at 11:35 AM
These arid evaporitic landscapes of the Atacama Desert are often referred to as "Mars analogues" (probably with excessive optimism). Yet, one only has to turn over the salt crust to discover colorful microbial life.
Amazing transition between living microbialites, a photosynthetic microbial mat, and fossil microbialites in a high-altitude salt flat in Chile
March 26, 2025 at 3:04 PM
Amazing transition between living microbialites, a photosynthetic microbial mat, and fossil microbialites in a high-altitude salt flat in Chile
Walking to our sampling point on a vast microbial mat (pink-salmon areas) in Laguna Azufrera, with the fumaroles of the Lastarria volcano visible on the horizon.
March 24, 2025 at 2:59 PM
Walking to our sampling point on a vast microbial mat (pink-salmon areas) in Laguna Azufrera, with the fumaroles of the Lastarria volcano visible on the horizon.
Frozen morning in our camp at Lagunas Bravas (4250 m high).
March 23, 2025 at 1:51 PM
Frozen morning in our camp at Lagunas Bravas (4250 m high).
Some flamingos and other aquatic birds in the 3676 m high Salar de Aguas Calientes, near the volcanos of the Lullaillaco National Park in Chile.
March 21, 2025 at 3:13 PM
Some flamingos and other aquatic birds in the 3676 m high Salar de Aguas Calientes, near the volcanos of the Lullaillaco National Park in Chile.
The new dynamin family has a particular domain architecture. It is widespread -and probably ancient- in eukaryotes (but missing in opisthokonts and plants) and it is also present in some bacteria, including planctomycetes (characterized by complex endomembrane systems).
March 21, 2025 at 1:04 PM
The new dynamin family has a particular domain architecture. It is widespread -and probably ancient- in eukaryotes (but missing in opisthokonts and plants) and it is also present in some bacteria, including planctomycetes (characterized by complex endomembrane systems).
This dynamin is anchored to the inner mitochondrial membrane.
March 21, 2025 at 1:04 PM
This dynamin is anchored to the inner mitochondrial membrane.