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Welcome to the Dionne lab!

That is to say, Marc Dionne's lab, at Imperial College London; not to be confused with any other Dionne lab.

We are interested in the ways in which host genotype affects the biology of bacterial infection. Drosophila melanogaster is our animal model of choice.

Work in the lab has been funded by the Biotechnology and Biological Sciences Research Council, the Wellcome Trust, and the Medical Research Council.

A BBSRC-funded postdoctoral position is available in the lab! If you're interested, get in touch, or apply here!

Metabolic-immune interaction and host genetics in infection

It has been known for centuries that chronic infections cause systemic metabolic disruption, but it is fundamentally unclear why and how these events are linked. Does metabolic disruption somehow facilitate the host response to infection? If so, how? We address these fundamental biological questions by analyzing pathogenic infections and their consequences in the fruit-fly Drosophila melanogaster. We use classical Drosophila genetics, computational analysis and modeling of gene expression, biochemistry, and intravital microscopy to probe the metabolic-immune interface.

One pathogen of particular interest to us is Mycobacterium marinum. We have previously shown that flies infected with M. marinum exhibit progressive loss of metabolic stores accompanied by mild hyperglycemia. We have shown that these effects are caused, in part, by systemic disruption of signaling via the anabolic effector kinases Akt and p70 S6 kinase. The transcription factor MEF2 responds to nutrient signals to regulate expression of both immune effectors and anabolic enzymes. Remarkably, though MEF2 promotes the expression of both groups of genes, its choice of targets is regulated by a conserved phosphorylation that alters its affinity for the TATA binding protein. It appears that the disruption of anabolic kinase activity may be required to permit MEF2 to drive the antibacterial response. This work has recently been published in Cell.

Ongoing work continues to explore other metabolic inputs into MEF2, other targets of MEF2 in its two discrete physiological states, and the pathways by which infection disrupts anabolic kinase activity.

Cytokines and cytokine signalling

In the course of screening for mutants with defective responses to M. marinum, we find a lot of molecules and pathways that end up being involved in cytokine signalling and its consequences. Cytokines regulate the realized immune response of the fly, much as they do in mammals; they also can be significant direct drivers of pathology due to effects on immune and nonimmune target tissues. However, very little is known about the biology of cytokines in Drosophila melanogaster, especially in the context of bacterial infections.

Some time back, we showed that two different TGF-betas regulate fly immunity, each inhibiting a specific arm of the immune response, and each being produced by only a subset of phagocytes. Check it out!

We've also done some exciting work in collaboration with Frederic Geissmann's lab on the role of JAK-STAT signalling in flies on a high-fat diet; you can read about it here. We continue to work on the roles of this pathway in Mycobacterium marinum infection and in muscle physiology—we hope to be able to say more about these soon.


Recent updates to the lab wiki

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14 June 2024

N    12:55  UA Biophysics:Peptides and IA‎‎ 3 changes history +1,837 [Elizabeth Suesca‎ (3×)]
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12:45 (cur | prev) +1,861 Elizabeth Suesca talk contribs (Created page with "Debido a la rápida aparición de mecanismos de resistencia a antibióticos en diferentes microorganismos patógenos potencialmente mortales a nivel mundial, existe un gran interés en la identificación de agentes antimicrobianos alternativos que puedan ayudar en el desarrollo de nuevas estrategias de tratamiento. Mediante la aplicación de una rutina de Deep Learning, desarrollada y publicada por el grupo de investigación proponente, se predecirá una lista de candida...")
     12:45  Biophysics‎‎ 3 changes history +204 [Elizabeth Suesca‎ (3×)]
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13 June 2024

     14:39 User creation log User account Yannvrb talk contribs was created by Yar talk contribs and password was sent by email ‎
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08:26 (cur | prev) +131 Berthold Drexler talk contribs (→‎halbsitzende Lagerung und Luftembolie)

12 June 2024

N    13:10  Karas Lab:YAEL Electrode Localization‎‎ 2 changes history +859 [Aclesage‎ (2×)]
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13:08 (cur | prev) +274 Aclesage talk contribs (Created page with "<b>Y</b>our <b>A</b>dvanced <b>E</b>lectrode <b>L</b>ocalizer (YAEL) is free and open-source software for localizing and visualizing electrodes. YAEL is a sister package to the RAVE software toolbox for the analysis of intracranial electroencephalogram (iEEG) data.")
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11 June 2024

N    19:16  BioMicroCenter:PricingFY2025 diffhist +28,119 Stuart S. Levine talk contribs (Created page with "''' PRICING UPDATE 7/1/2024 ''' == SEQUENCING == Please note that samples submitted from '''CORE LAB'''s will be given priority on all equipment. The BioMicro Center reserves the right to reject samples for any reason. <BR><BR> === NOVASEQ SEQUENCING === {| class="wikitable" border=1  ! NOVASEQ SEQUENCING !width=80| CORE LAB !width=80| MIT !width=80| Non-MIT !width=80| uni...")
     18:40  BioMicroCenter:Pricing diffhist +54 Stuart S. Levine talk contribs (→‎COMPUTATIONAL SERVICES)
     08:18  Forster Lab‎‎ 2 changes history +153 [Anthony C. Forster‎ (2×)]
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