Cathy Sirour-Geoffroy
@ktigeoffroysirour.bsky.social
Developmental Biology, phD
Ascidian embryos, microscopy 🔬 and images analysis 👩🏼💻
LBDV lab, Sorbonne university, CNRS
Olympics game addict 🏊♀️
Ascidian embryos, microscopy 🔬 and images analysis 👩🏼💻
LBDV lab, Sorbonne university, CNRS
Olympics game addict 🏊♀️
Reposted by Cathy Sirour-Geoffroy
Deadline to submit your application is approaching!
Come for the fun! Stay for the fun
Come for the fun! Stay for the fun
🚨🚨🚨
The SFBD board needs to be renewed with 5 members
We wish to strengthen our board with young scientists
To apply: send a brief text introducing your research interests and motivations to sfbd@sfbd.fr by December 4th
Elections will be held online from December 10th to 17th
Please share the info
The SFBD board needs to be renewed with 5 members
We wish to strengthen our board with young scientists
To apply: send a brief text introducing your research interests and motivations to sfbd@sfbd.fr by December 4th
Elections will be held online from December 10th to 17th
Please share the info
November 25, 2025 at 8:07 PM
Deadline to submit your application is approaching!
Come for the fun! Stay for the fun
Come for the fun! Stay for the fun
Reposted by Cathy Sirour-Geoffroy
Drawing together findings from several projects over many years, we make a case that neural cell types in the Clytia larva have two embryological origins: i-cells and ectodermal.
bioRxiv 2025.11.17.688882; doi: doi.org/10.1101/2025...
bioRxiv 2025.11.17.688882; doi: doi.org/10.1101/2025...
November 19, 2025 at 7:43 AM
Drawing together findings from several projects over many years, we make a case that neural cell types in the Clytia larva have two embryological origins: i-cells and ectodermal.
bioRxiv 2025.11.17.688882; doi: doi.org/10.1101/2025...
bioRxiv 2025.11.17.688882; doi: doi.org/10.1101/2025...
Reposted by Cathy Sirour-Geoffroy
The rare & beautiful violet sea snail - a predator of Portuguese Man O’War & by-the-wind sailors. It lives its whole life at the surface of the open ocean, using a bubble raft to stay afloat. It’s normally more common in warmer waters but occasionally seen here
#marinebiology #marinelife #oceanlife
#marinebiology #marinelife #oceanlife
November 17, 2025 at 7:03 PM
The rare & beautiful violet sea snail - a predator of Portuguese Man O’War & by-the-wind sailors. It lives its whole life at the surface of the open ocean, using a bubble raft to stay afloat. It’s normally more common in warmer waters but occasionally seen here
#marinebiology #marinelife #oceanlife
#marinebiology #marinelife #oceanlife
Reposted by Cathy Sirour-Geoffroy
Axonal pathfinding of zebrafish retinal ganglion cells forms the optic nerve. Credit to Dr. Matthew Bostock @houartlab.bsky.social. #ZebrafishZunday 🧪
November 16, 2025 at 8:30 PM
Axonal pathfinding of zebrafish retinal ganglion cells forms the optic nerve. Credit to Dr. Matthew Bostock @houartlab.bsky.social. #ZebrafishZunday 🧪
Reposted by Cathy Sirour-Geoffroy
Proud to have been part of this very nice piece of work and this great collaboration. Congratulations to all. www.science.org/doi/10.1126/...
Single-nucleus profiling highlights the all-brain echinoderm nervous system
A sea urchin is a head with a brain-like organization and a vertebrate-type retinal signature.
www.science.org
November 14, 2025 at 8:41 AM
Proud to have been part of this very nice piece of work and this great collaboration. Congratulations to all. www.science.org/doi/10.1126/...
Reposted by Cathy Sirour-Geoffroy
I am honored to be named again among the Highly Cited Researchers. Deep thanks to the students, colleagues, and partners whose work, reviews, and open data enable rigorous research.
🌊 @iddri.bsky.social @cnrs.fr @sorbonne-universite.fr @imev-mer.fr
clarivate.com/highly-cited...
🌊 @iddri.bsky.social @cnrs.fr @sorbonne-universite.fr @imev-mer.fr
clarivate.com/highly-cited...
Clarivate Highly Cited Researchers 2025
The Highly Cited Researchers 2025 list identifies and celebrates individuals who have demonstrated significant and broad influence in their fields of research. Through rigorous selection criteria and ...
clarivate.com
November 12, 2025 at 10:03 AM
I am honored to be named again among the Highly Cited Researchers. Deep thanks to the students, colleagues, and partners whose work, reviews, and open data enable rigorous research.
🌊 @iddri.bsky.social @cnrs.fr @sorbonne-universite.fr @imev-mer.fr
clarivate.com/highly-cited...
🌊 @iddri.bsky.social @cnrs.fr @sorbonne-universite.fr @imev-mer.fr
clarivate.com/highly-cited...
Reposted by Cathy Sirour-Geoffroy
Could not be more happy/proud/relieved to finally see this longstanding study published. Bluetorial to follow. @msarscentre.bsky.social
Cell cycle-driven transcriptome maturation confers multilineage competence to cardiopharyngeal progenitors | The EMBO Journal www.embopress.org/doi/full/10....
Cell cycle-driven transcriptome maturation confers multilineage competence to cardiopharyngeal progenitors | The EMBO Journal www.embopress.org/doi/full/10....
Cell cycle-driven transcriptome maturation confers multilineage competence to cardiopharyngeal progenitors | The EMBO Journal
imageimageDuring development, multipotent cardiopharyngeal progenitors express both cardiac
and pharyngeal muscle transcriptional programs. This study in the tunicate Ciona shows that cell cycle-regul...
www.embopress.org
November 4, 2025 at 6:05 AM
Could not be more happy/proud/relieved to finally see this longstanding study published. Bluetorial to follow. @msarscentre.bsky.social
Cell cycle-driven transcriptome maturation confers multilineage competence to cardiopharyngeal progenitors | The EMBO Journal www.embopress.org/doi/full/10....
Cell cycle-driven transcriptome maturation confers multilineage competence to cardiopharyngeal progenitors | The EMBO Journal www.embopress.org/doi/full/10....
Reposted by Cathy Sirour-Geoffroy
Cell cycle-driven transcriptome maturation confers multilineage competence to cardiopharyngeal progenitors
Wei Wang, @lionlchristiaen.bsky.social and colleagues
www.embopress.org/doi/full/10....
Wei Wang, @lionlchristiaen.bsky.social and colleagues
www.embopress.org/doi/full/10....
November 5, 2025 at 2:45 PM
Cell cycle-driven transcriptome maturation confers multilineage competence to cardiopharyngeal progenitors
Wei Wang, @lionlchristiaen.bsky.social and colleagues
www.embopress.org/doi/full/10....
Wei Wang, @lionlchristiaen.bsky.social and colleagues
www.embopress.org/doi/full/10....
Reposted by Cathy Sirour-Geoffroy
These are embryos of a jellyfish, made up of cells that are about a fiftieth of a millimetre in size. Their outlines are visible thanks to fluorescent markers identified by Sarah Asaf and @clytia-vlfr.bsky.social
see doi.org/10.1101/2024...
🧵
see doi.org/10.1101/2024...
🧵
October 26, 2025 at 2:12 PM
These are embryos of a jellyfish, made up of cells that are about a fiftieth of a millimetre in size. Their outlines are visible thanks to fluorescent markers identified by Sarah Asaf and @clytia-vlfr.bsky.social
see doi.org/10.1101/2024...
🧵
see doi.org/10.1101/2024...
🧵
Reposted by Cathy Sirour-Geoffroy
What are these?
You are looking at embryos of a sea squirt. Each of the 'soap bubbles' is a living cell, about a fourtieth of a millimetre in size. The outlines of the cells are visible thanks to fluorescent markers identified by Hitoyoshi Yasuo @hitoyas.bsky.social
see doi.org/10.1101/2024... 🧵
You are looking at embryos of a sea squirt. Each of the 'soap bubbles' is a living cell, about a fourtieth of a millimetre in size. The outlines of the cells are visible thanks to fluorescent markers identified by Hitoyoshi Yasuo @hitoyas.bsky.social
see doi.org/10.1101/2024... 🧵
October 26, 2025 at 8:55 AM
What are these?
You are looking at embryos of a sea squirt. Each of the 'soap bubbles' is a living cell, about a fourtieth of a millimetre in size. The outlines of the cells are visible thanks to fluorescent markers identified by Hitoyoshi Yasuo @hitoyas.bsky.social
see doi.org/10.1101/2024... 🧵
You are looking at embryos of a sea squirt. Each of the 'soap bubbles' is a living cell, about a fourtieth of a millimetre in size. The outlines of the cells are visible thanks to fluorescent markers identified by Hitoyoshi Yasuo @hitoyas.bsky.social
see doi.org/10.1101/2024... 🧵
Reposted by Cathy Sirour-Geoffroy
Thalia democratica "catches the eye of Nikkon" !
"Oozoid of a sea squirt" reconnue "Image of Distinction" au concours 2025 "Nikkon Small World Photomicrography"
Mette Handberg-Thorsager, LM Ulbrich @uni-goettingen.de & A. Alié @biodev-vlfr.bsky.social
www.nikonsmallworld.com/galleries/20...
"Oozoid of a sea squirt" reconnue "Image of Distinction" au concours 2025 "Nikkon Small World Photomicrography"
Mette Handberg-Thorsager, LM Ulbrich @uni-goettingen.de & A. Alié @biodev-vlfr.bsky.social
www.nikonsmallworld.com/galleries/20...
Oozoid of a sea squirt (Thalia democratica) | 2025 Photomicrography Competition
Mette Handberg-Thorsager - Oozoid of a sea squirt (Thalia democratica)
www.nikonsmallworld.com
October 16, 2025 at 12:37 PM
Thalia democratica "catches the eye of Nikkon" !
"Oozoid of a sea squirt" reconnue "Image of Distinction" au concours 2025 "Nikkon Small World Photomicrography"
Mette Handberg-Thorsager, LM Ulbrich @uni-goettingen.de & A. Alié @biodev-vlfr.bsky.social
www.nikonsmallworld.com/galleries/20...
"Oozoid of a sea squirt" reconnue "Image of Distinction" au concours 2025 "Nikkon Small World Photomicrography"
Mette Handberg-Thorsager, LM Ulbrich @uni-goettingen.de & A. Alié @biodev-vlfr.bsky.social
www.nikonsmallworld.com/galleries/20...
Reposted by Cathy Sirour-Geoffroy
Sea cucumbers are beautiful! 🥒
This image shows the skeleton of a baby sea cucumber. Very happy that it got awarded by #NikonSmallWorld 😊
👇 Check the preprint by @PranavVyas and @prakashlab.bsky.social if you want to learn more about skeleton development in these animals:
shorturl.at/J3g1h
This image shows the skeleton of a baby sea cucumber. Very happy that it got awarded by #NikonSmallWorld 😊
👇 Check the preprint by @PranavVyas and @prakashlab.bsky.social if you want to learn more about skeleton development in these animals:
shorturl.at/J3g1h
October 16, 2025 at 3:29 PM
Sea cucumbers are beautiful! 🥒
This image shows the skeleton of a baby sea cucumber. Very happy that it got awarded by #NikonSmallWorld 😊
👇 Check the preprint by @PranavVyas and @prakashlab.bsky.social if you want to learn more about skeleton development in these animals:
shorturl.at/J3g1h
This image shows the skeleton of a baby sea cucumber. Very happy that it got awarded by #NikonSmallWorld 😊
👇 Check the preprint by @PranavVyas and @prakashlab.bsky.social if you want to learn more about skeleton development in these animals:
shorturl.at/J3g1h
Reposted by Cathy Sirour-Geoffroy
« C’est une tragédie qui se déroule sous nos yeux » @jpgattuso.bsky.social #LOV
Le dépérissement des coraux est un « lanceur d’alerte » des points de bascule de la planète
Retrouvez deux articles @lemonde.fr #LaCroix
www.lemonde.fr/planete/arti...
www.la-croix.com/planete/cora...
Le dépérissement des coraux est un « lanceur d’alerte » des points de bascule de la planète
Retrouvez deux articles @lemonde.fr #LaCroix
www.lemonde.fr/planete/arti...
www.la-croix.com/planete/cora...
Le premier point de bascule de la planète aurait été atteint avec le « dépérissement généralisé » des coraux
Un rapport signé par 160 scientifiques, publié lundi, alerte sur la « crise sans précédent » rencontrée par les récifs coralliens d’eau chaude.
www.lemonde.fr
October 15, 2025 at 4:22 PM
« C’est une tragédie qui se déroule sous nos yeux » @jpgattuso.bsky.social #LOV
Le dépérissement des coraux est un « lanceur d’alerte » des points de bascule de la planète
Retrouvez deux articles @lemonde.fr #LaCroix
www.lemonde.fr/planete/arti...
www.la-croix.com/planete/cora...
Le dépérissement des coraux est un « lanceur d’alerte » des points de bascule de la planète
Retrouvez deux articles @lemonde.fr #LaCroix
www.lemonde.fr/planete/arti...
www.la-croix.com/planete/cora...
Reposted by Cathy Sirour-Geoffroy
BIG ANNOUNCEMENT📣: I haven’t been this excited to be part of something new in 15 years… Thrilled to reveal the passion project I’ve been working on for the past year and a half!🙀🥳 (thread 👇)
October 15, 2025 at 12:22 PM
BIG ANNOUNCEMENT📣: I haven’t been this excited to be part of something new in 15 years… Thrilled to reveal the passion project I’ve been working on for the past year and a half!🙀🥳 (thread 👇)
Reposted by Cathy Sirour-Geoffroy
We hire!
The CytoMorpho Lab is looking for an engineer with a background in cell and molecular biology to join our team in Paris. This is a 18-month contract position, but we're open to exploring long-term opportunities.
More details here:
cytomorpholab.com/index.php/jo...
The CytoMorpho Lab is looking for an engineer with a background in cell and molecular biology to join our team in Paris. This is a 18-month contract position, but we're open to exploring long-term opportunities.
More details here:
cytomorpholab.com/index.php/jo...
October 14, 2025 at 1:50 PM
We hire!
The CytoMorpho Lab is looking for an engineer with a background in cell and molecular biology to join our team in Paris. This is a 18-month contract position, but we're open to exploring long-term opportunities.
More details here:
cytomorpholab.com/index.php/jo...
The CytoMorpho Lab is looking for an engineer with a background in cell and molecular biology to join our team in Paris. This is a 18-month contract position, but we're open to exploring long-term opportunities.
More details here:
cytomorpholab.com/index.php/jo...
@biodev-vlfr.bsky.social Ready for the "Fête de la science" 🐙🪼🔬🦠. Village des sciences Villeneuve-Loubet
@imev-mer.fr @sorbonne-universite.fr @cnrsbiologie.bsky.social
@imev-mer.fr @sorbonne-universite.fr @cnrsbiologie.bsky.social
October 4, 2025 at 11:13 AM
@biodev-vlfr.bsky.social Ready for the "Fête de la science" 🐙🪼🔬🦠. Village des sciences Villeneuve-Loubet
@imev-mer.fr @sorbonne-universite.fr @cnrsbiologie.bsky.social
@imev-mer.fr @sorbonne-universite.fr @cnrsbiologie.bsky.social
Reposted by Cathy Sirour-Geoffroy
La quasi-totalité des méduses mènent une double vie : fixées dans les fonds marins ou libres dans l’eau. Mais certaines ont échappé à ce cycle et passent toute leur vie à dériver. Selon une nouvelle étude, ces espèces dites holoplanctoniques ont colonisé l'Océan. Dériver pour mieux régner !
Le radeau des méduses : quand dériver permet de coloniser l’océan
La plupart des méduses mènent une double vie : fixées au fond, puis libres dans l’eau. Mais certaines ont échappé à ce cycle et passent toute leur vie à dériver. Selon une nouvelle étude, ces espèces ...
www.radiofrance.fr
August 27, 2025 at 6:04 AM
La quasi-totalité des méduses mènent une double vie : fixées dans les fonds marins ou libres dans l’eau. Mais certaines ont échappé à ce cycle et passent toute leur vie à dériver. Selon une nouvelle étude, ces espèces dites holoplanctoniques ont colonisé l'Océan. Dériver pour mieux régner !
Reposted by Cathy Sirour-Geoffroy
Check out the latest work by @dbenzinger.bsky.social and @jamesbriscoe.bsky.social !
Building gradients in space and time.
I am extremely biased but the Dec 15 issue of Dev Cell is 🔥🔥
Building gradients in space and time.
I am extremely biased but the Dec 15 issue of Dev Cell is 🔥🔥
Our latest: We developed a chemo-optogenetic system for precise spatiotemporal control of morphogen production. Using dual light + small molecule control of Sonic Hedgehog production, we recapitulated neural tube patterning in vitro & measured spread of Shh
🧵
www.sciencedirect.com/science/arti...
🧵
www.sciencedirect.com/science/arti...
Investigating morphogen and patterning dynamics with optogenetic control of morphogen production
Morphogen gradients provide the patterning cues that instruct cell fate decisions during development. Here, we establish an optogenetic system for the…
www.sciencedirect.com
August 26, 2025 at 12:40 PM
Check out the latest work by @dbenzinger.bsky.social and @jamesbriscoe.bsky.social !
Building gradients in space and time.
I am extremely biased but the Dec 15 issue of Dev Cell is 🔥🔥
Building gradients in space and time.
I am extremely biased but the Dec 15 issue of Dev Cell is 🔥🔥
Reposted by Cathy Sirour-Geoffroy
🪼 How did the animal body plan evolve?
This ‘fundamental’ study in Clytia sheds light on how Wnt3 coordinates both gene expression and planar cell polarity during axis formation, offering key insights into the origins of morphogenesis.
buff.ly/lLJ33VF
#DevBio
This ‘fundamental’ study in Clytia sheds light on how Wnt3 coordinates both gene expression and planar cell polarity during axis formation, offering key insights into the origins of morphogenesis.
buff.ly/lLJ33VF
#DevBio
July 26, 2025 at 1:59 PM
🪼 How did the animal body plan evolve?
This ‘fundamental’ study in Clytia sheds light on how Wnt3 coordinates both gene expression and planar cell polarity during axis formation, offering key insights into the origins of morphogenesis.
buff.ly/lLJ33VF
#DevBio
This ‘fundamental’ study in Clytia sheds light on how Wnt3 coordinates both gene expression and planar cell polarity during axis formation, offering key insights into the origins of morphogenesis.
buff.ly/lLJ33VF
#DevBio
Reposted by Cathy Sirour-Geoffroy
🐙 This Octopus shifts from deep to active rest while "dreaming" for #MicroscopyMonday. REM‑like sleep (color bursts and twitches) filmed in real time by Horst Obenhaus @octoscience.bsky.social, currently a 2025 Whitman Fellow at @mblscience.bsky.social. #NESM
#Octopus #Neuro #SleepScience #MBL
#Octopus #Neuro #SleepScience #MBL
July 21, 2025 at 11:53 AM
🐙 This Octopus shifts from deep to active rest while "dreaming" for #MicroscopyMonday. REM‑like sleep (color bursts and twitches) filmed in real time by Horst Obenhaus @octoscience.bsky.social, currently a 2025 Whitman Fellow at @mblscience.bsky.social. #NESM
#Octopus #Neuro #SleepScience #MBL
#Octopus #Neuro #SleepScience #MBL
Reposted by Cathy Sirour-Geoffroy
Researchers from @imev-mer.fr recently visited us for a workshop supported by the French-Norwegian mobility program Åsgard 🌊 Between seminars, lab demos and discussions, new ideas and plans for long-term collaborations emerged 🤩 Read more about this exciting partnership below ⤵️
Åsgard workshop sparks new collaborations at the Michael Sars Centre
Researchers from the Institut de la Mer de Villefranche and the Michael Sars Centre received support from the French-Norwegian mobility program Åsgard. Through seminars and discussions, participants l...
tinyurl.com
July 17, 2025 at 12:21 PM
Researchers from @imev-mer.fr recently visited us for a workshop supported by the French-Norwegian mobility program Åsgard 🌊 Between seminars, lab demos and discussions, new ideas and plans for long-term collaborations emerged 🤩 Read more about this exciting partnership below ⤵️
Reposted by Cathy Sirour-Geoffroy
🪼 How did the animal body plan evolve?
This ‘fundamental’ study in Clytia sheds light on how Wnt3 coordinates both gene expression and planar cell polarity during axis formation, offering key insights into the origins of morphogenesis.
buff.ly/e1Un958
#DevBio
This ‘fundamental’ study in Clytia sheds light on how Wnt3 coordinates both gene expression and planar cell polarity during axis formation, offering key insights into the origins of morphogenesis.
buff.ly/e1Un958
#DevBio
July 13, 2025 at 10:01 AM
🪼 How did the animal body plan evolve?
This ‘fundamental’ study in Clytia sheds light on how Wnt3 coordinates both gene expression and planar cell polarity during axis formation, offering key insights into the origins of morphogenesis.
buff.ly/e1Un958
#DevBio
This ‘fundamental’ study in Clytia sheds light on how Wnt3 coordinates both gene expression and planar cell polarity during axis formation, offering key insights into the origins of morphogenesis.
buff.ly/e1Un958
#DevBio
Reposted by Cathy Sirour-Geoffroy
Come and Join our Dpt in Beautiful #Geneva !
We are looking for a #Microscopy & #Image #Analysis expert to help all of us at the Dpt.
We are looking for a #Microscopy & #Image #Analysis expert to help all of us at the Dpt.
Hello microscopy and imaging experts and enthusiasts!
We are looking for a staff scientist to join us here in Geneva to work on microscopy and image analysis projects! See the link for the job announcement (in French and in English).
Please apply and/or repost!
jobs.unige.ch/www/wd_porta...
We are looking for a staff scientist to join us here in Geneva to work on microscopy and image analysis projects! See the link for the job announcement (in French and in English).
Please apply and/or repost!
jobs.unige.ch/www/wd_porta...
July 8, 2025 at 4:24 AM
Come and Join our Dpt in Beautiful #Geneva !
We are looking for a #Microscopy & #Image #Analysis expert to help all of us at the Dpt.
We are looking for a #Microscopy & #Image #Analysis expert to help all of us at the Dpt.
Reposted by Cathy Sirour-Geoffroy
This postdoc position is still open! Apply if you want to come work with us on asymmetric cell divisions in spiralian embryos! postdocs.stanford.edu/prospective/...
July 7, 2025 at 8:51 PM
This postdoc position is still open! Apply if you want to come work with us on asymmetric cell divisions in spiralian embryos! postdocs.stanford.edu/prospective/...
Reposted by Cathy Sirour-Geoffroy
Interested in visiting Villefranche, Roscoff or Banyuls marine stations? The EMBRC-France (www.embrc-france.fr) 8th Call for Projects is open. Deadline Sept 19 for stays by end of June 2026. Up to 42 person-days per project are covered, with access to EMBRC-France services, accommodation & catering.
Accueil | EMBRC France
www.embrc-france.fr
July 7, 2025 at 12:01 PM
Interested in visiting Villefranche, Roscoff or Banyuls marine stations? The EMBRC-France (www.embrc-france.fr) 8th Call for Projects is open. Deadline Sept 19 for stays by end of June 2026. Up to 42 person-days per project are covered, with access to EMBRC-France services, accommodation & catering.