Geoffroy Mallaret
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gmallaret.bsky.social
Geoffroy Mallaret
@gmallaret.bsky.social
Ph.D. Gut Brain Microbiome axis, microbiology, behavior, neurosciences, infections 💩🦠🧠🐀. Postdoctoral fellow at Pasteur Institute.
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Thrilled to share our recent research with Laetitia Davidovic, investigating how p-cresol contributes to social deficits by modulating host catecholamine-biosynthesizing enzymes. A huge thank-you to the entire team for their exceptional work. Hope you enjoy it!
www.nature.com/articles/s42...
The autism-linked gut microbial metabolite p-cresol inhibits host catecholamine biosynthesizing enzymes to elicit social deficits - Communications Biology
The microbial metabolite p-cresol and p-cresol sulfate accumulate in brainstem and inhibit TH and DBH, key enzymes in catecholamine synthesis. This disruption alters brain function and behavior, ...
www.nature.com
Reposted by Geoffroy Mallaret
please share this postdoc job alert! come join the budding Biodiversity Cell Atlas initiative as a postdoc or senior postdoc at @sangerinstitute.bsky.social working closely with @arnausebe.bsky.social and me to make progress on what we cover in this paper www.nature.com/articles/s41...
The Biodiversity Cell Atlas: mapping the tree of life at cellular resolution - Nature
The Biodiversity Cell Atlas aims to create comprehensive single-cell molecular atlases across the eukaryotic tree of life, which will be phylogenetically informed, rely on high-quality genomes and use...
www.nature.com
December 3, 2025 at 1:29 PM
Reposted by Geoffroy Mallaret
Faecal metabolites as a readout of habitual diet capture dietary interactions with the gut microbiome.

By integrating faecal metabolomics, metagenomics, and dietary data Falchi et al. show that faecal metabolites capture mediations between diet and the gut microbiome

www.nature.com/articles/s41...
Faecal metabolites as a readout of habitual diet capture dietary interactions with the gut microbiome - Nature Communications
Here, by integrating faecal metabolomics, metagenomics, and habitual dietary data of two large human cohorts, the authors show that faecal metabolites reflect diet and gut microbiome interactions, pre...
www.nature.com
December 4, 2025 at 11:10 AM
Reposted by Geoffroy Mallaret
Excited to share our new preprint: “Local B cell maturation and mast cell regulation of choroid plexus function in early life” www.biorxiv.org/content/10.1... , initiated in the lab by Laetitia Travier and led by the one and only @fakesamir.bsky.social
Local B cell maturation and mast cell regulation of choroid plexus function in early life.
Postnatal development is a critical period for the maturation of the nervous and immune systems. The choroid plexus (CP) within the brain ventricles guides brain development through the production of ...
www.biorxiv.org
December 3, 2025 at 9:29 AM
Reposted by Geoffroy Mallaret
📜It has been a pleasure to collaborate in this highly interesting study published in @commsbio.nature.com!

🎉Congrats @gmallaret.bsky.social and colleagues!

🔜And more to come from the collaboration bewteen Laetitia Davidovic's research group and Applied Metabolomics at @researchmar.bsky.social.
November 25, 2025 at 7:24 AM
Thrilled to share our recent research with Laetitia Davidovic, investigating how p-cresol contributes to social deficits by modulating host catecholamine-biosynthesizing enzymes. A huge thank-you to the entire team for their exceptional work. Hope you enjoy it!
www.nature.com/articles/s42...
The autism-linked gut microbial metabolite p-cresol inhibits host catecholamine biosynthesizing enzymes to elicit social deficits - Communications Biology
The microbial metabolite p-cresol and p-cresol sulfate accumulate in brainstem and inhibit TH and DBH, key enzymes in catecholamine synthesis. This disruption alters brain function and behavior, ...
www.nature.com
November 22, 2025 at 7:05 PM
Triste d'apprendre la disparition de Philippe Taquet. L'empreinte des dinosaures restera pour moi un de mes livres de paléontologie favoris. 😢
November 18, 2025 at 6:24 PM
Unlocking the power of human milk and infant feeding: Understanding how nutrition and early microbiota interaction shapes health programming 👶🍼🤱🦠🔬
www.cell.com/cell-host-mi...
Unlocking the power of human milk and infant feeding: Understanding how nutrition and early microbiota interaction shapes health programming
Infant feeding plays a crucial role in microbial colonization, immune maturation, and development. Human milk is a bioactive system comprising biologics that shape the infant gut microbiome and suppor...
www.cell.com
June 19, 2025 at 4:51 PM
I am pleased to share our new study about the perinatal involvement of the microbial metabolite p-cresol in neurodevelopmental disorders. Enjoy :)
www.nature.com/articles/s41...
Perinatal exposure to the autism-linked metabolite p-Cresol has limited impact on early development in mice but lasting effects on adult social behavior - Scientific Reports
Scientific Reports - Perinatal exposure to the autism-linked metabolite p-Cresol has limited impact on early development in mice but lasting effects on adult social behavior
www.nature.com
April 16, 2025 at 2:56 PM
Reposted by Geoffroy Mallaret
After last week publication from the lab on circuits of social isolation/satiety, today we publish a different line of research by @harriskaplan.bsky.social et al., on the development trajectories of hypothalamic POA cell types driving survival and social behavior.
www.nature.com/articles/s41...
Sensory input, sex and function shape hypothalamic cell type development - Nature
Paired transcriptomic and chromatin accessibility profiling are used to examine the developmental trajectories of neuronal populations in the hypothalamic preoptic region, including cell types with ke...
www.nature.com
March 5, 2025 at 4:50 PM
Reposted by Geoffroy Mallaret
Happy 37th birthday to the LTEE!
the-ltee.org/history/
History – The Long-Term Evolution Experiment
the-ltee.org
February 24, 2025 at 3:39 PM
Reposted by Geoffroy Mallaret
🎉New article from our team demonstating that a #microbiota derived #bileacid improves hepatic #cholesterol levels in mice with cancer #cachexia! Congratulations to Morgane Thibaut & Martin Roumain! Thanks to our collaborators, the FNRS and the @welbio.bsky.social www.tandfonline.com/doi/full/10....
The microbiota-derived bile acid taurodeoxycholic acid improves hepatic cholesterol levels in mice with cancer cachexia
Alterations in bile acid profile and pathways contribute to hepatic inflammation in cancer cachexia, a syndrome worsening the prognosis of cancer patients. As the gut microbiota impinges on host me...
www.tandfonline.com
January 13, 2025 at 6:46 PM
Self-experience of a negative event alters responses to others in similar states through prefrontal cortex CRF mechanisms
www.nature.com/articles/s41...
Self-experience of a negative event alters responses to others in similar states through prefrontal cortex CRF mechanisms - Nature Neuroscience
Maltese et al. show in mice that experiencing an adverse event affects future interaction with others experiencing the same stressor. These self-experience socioemotional reactions are orchestrated by...
www.nature.com
January 9, 2025 at 11:59 AM
Reposted by Geoffroy Mallaret
PGN is such a phenomenal intra- and inter-kingdom signalling molecule!
#MicroSky #MicrobiomeSky
January 3, 2025 at 5:13 PM