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Shutt Lab

@mitomorph.bsky.social
1.2K followers 360 following 76 posts

Associate Professor at University of Calgary studying mitochondria.

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Shutt Lab @mitomorph.bsky.social · 30/09/2026
At the end of the day, we believe that Mashiat has uncovered two novel mechanisms by which MFN2 dysfunction leads to myopathy and ataxia. Surprisingly, both pathways appear to be distinct from mitochondrial fusion, and both pathologies appear to be distinct from peripheral neuropathy.
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Shutt Lab @mitomorph.bsky.social · 30/09/2026
While the endosome release pathway clearly correlates with myopathy, we still don't now the relevance of the MDV release pathway to MFN2 disease - though it does lead to a 2-3 fold increase in cGAS-STING inflammation.
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Shutt Lab @mitomorph.bsky.social · 30/09/2026
By blocking one each pathway separately or together, we were able to show that these appear to be separate and distinct pathways.
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Shutt Lab @mitomorph.bsky.social · 30/09/2026
For example, while MDVs have been described to deliver mtDNA to lysosomes, maybe they also deliver mtDNA to endosomes...
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Shutt Lab @mitomorph.bsky.social · 30/09/2026
However, we don't know of anyone who has seen both types of mtDNA release in the same cell at the same time. We then wondered if these release pathways were indeed separate of if maybe they might be related...
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Shutt Lab @mitomorph.bsky.social · 30/09/2026
At this point it is important to note that other groups have described mtDNA release through endosomes (@dplamartin.bsky.social and @lauraenewmanphd.bsky.social in Gerry Shadel's lab at the time) as well as mtDNA release through MDVs (@prudentlab.bsky.social and @mitodynamics.bsky.social).
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Shutt Lab @mitomorph.bsky.social · 30/09/2026
In addition to the endosomal mtDNA release linked to myopathy. We also saw that some cell lines had smaller mtDNA puncta that were outside of the mitochondrial network but were not inside of endosomes. It turns out these smaller mtDNA puncta were inside of mitochondrial derived vesicles (MDVs).
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Shutt Lab @mitomorph.bsky.social · 30/09/2026
We also were able to dig a bit deeper into the mechanism of mtDNA release. To our surprise, we found that MFN2 dysfunction can drive mtDNA release via two distinct pathways.
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Shutt Lab @mitomorph.bsky.social · 30/09/2026
In the second paper (doi.org/10.64898/202...), we show that MFN2 variants that cause myopathy promote mtDNA release via endosomes, which leads to increased inflammation via TLR9 and cGAS-STING pathways. We believe this inflammation is what drives the myopathy in the patients.
doi.org
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Shutt Lab @mitomorph.bsky.social · 30/09/2026
This increased lipid flux into mitochondria leads to reduced B-oxidation and increased lipid peroxidation that drives ferroptosis. We believe this increased sensitivity to ferroptosis likely explains the ataxia phenotype, as increased ferroptosis is also described in other ataxias.
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Shutt Lab @mitomorph.bsky.social · 30/09/2026
In the first paper (doi.org/10.64898/202...), we show that MFN2 variants causing ataxia have a unique lipid phenotype due to a gain of function that increases the transfer of fatty acids from lipid droplets to mitochondria.
doi.org
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Shutt Lab @mitomorph.bsky.social · 30/09/2026
To test this notion, Mashiat re-expressed a series of pathogenic MFN2 variants in MFN2 KO cells. The MFN2 variants represented a variety of pathogenic phenotypes, and allowed us to identify conserved cellular functions that correlated with specific pathologies.
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Shutt Lab @mitomorph.bsky.social · 30/09/2026
This led us to wonder if distinct types of MFN2 dysfunction might be linked to specific patient pathologies...
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Shutt Lab @mitomorph.bsky.social · 30/09/2026
Although Mitofusin2 was initially described for its role in mitochondrial fusion, we now know that it has several other jobs as well, including mediating contacts with other organelles, mitophagy and mitochondrial motility.
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Shutt Lab @mitomorph.bsky.social · 30/09/2026
While pathogenic variant in MFN2 are well known to cause peripheral neuropathy, some variants can cause other pathologies, either in addition to or separate from peripheral neuropathy. How MFN2 dysfunction leads to these different pathologies was a key question driving Mashiat's PhD project.
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Shutt Lab @mitomorph.bsky.social · 30/09/2026
We are delighted to share not one, but two new preprints on Mitofusin2 from recent PhD graduate Mashiat Zaman @mashiatzaman.bsky.social doi.org/10.64898/202... doi.org/10.64898/202...
doi.org
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mitotalks.bsky.social @mitotalks.bsky.social · 28/09/2026
What if mitochondria have a buddy to supply them with the right substrates at the right time? Tune in this thursday, and our speaker @nunoraimundo.bsky.social will tell you how mitochondria-lysosome crosstalk can be a tool when metabolism needs to be rewired. See you there?
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Shutt Lab @mitomorph.bsky.social · 14/09/2026
Congrats to superstar Mashiat Zaman @mashiatzaman.bsky.social, on the successful defense of his PhD thesis! Hopefully, you'll be hearing more about his work on MFN2 soon.
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mitotalks.bsky.social @mitotalks.bsky.social · 13/09/2026
Are you working on mitochondria-related topics? We want to hear from you. MITOchat slots open for applications. Apply here: mitotalks.org Deadline: September 17th, 2026 We want to see the MITOscoence of the future again! Image
mitotalks.org
MITO talks online seminar series | mitochondria
MITOtalks: Online Seminar Series Focusing on Mitochondria
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Jonathan Friedman @labfriedman.bsky.social · 29/06/2026
New preprint from our lab! We uncover how a subset of mitophagy proteins BNIP3 and NIX are repressed and protected from turnover, we think so that they can perform a surveillance role to detect mitochondrial dysfunction under basal conditions. t.co/4XKkd4LsFi
t.co
https://www.biorxiv.org/content/10.64898/2026.06.25.734517v1
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Natalie Niemi @nieminm.bsky.social · 29/06/2026
Excited to have been able to collaborate with @labfriedman.bsky.social on this exciting new study that uncovers a new layer of regulation for BNIP3 and NIX!
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Nitish Dua @nitishdua.bsky.social · 27/06/2026
Really hyped to share our pre-print on mtDNA replication-fission ! @nanigrotjahn.bsky.social (doi: doi.org/10.64898/202...) 🧵with details below ⤵️
doi.org
ATAD3A structurally links mtDNA replication and mitochondrial fission
Mitochondrial function depends on the maintenance of its genome, and disruptions in copy number and distribution are hallmarks of mitochondrial disorders. Mitochondrial DNA (mtDNA) replication is spat...
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Life Science Alliance @lsajournal.org · 10/06/2026
Immunology Collection: MFN2 Q367H drives mtDNA release and inflammation, uncovering a new mechanism of MFN2-linked disease. @mitomorph.bsky.social www.life-science-alliance.org/content/lsa-... Read the full paper here: www.life-science-alliance.org/content/8/6/...
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Suzanne Hoppins @shoppins.bsky.social · 07/05/2026
Time-resolved tmFRET reveals GTP-coupled conformational changes in Mfn1 rupress.org/jcb/article-...
rupress.org
Time-resolved tmFRET reveals GTP-coupled conformational changes in Mfn1
Hurwitz et al. leverage a novel FRET-based approach to quantify conformational dynamics of Mfn1, a member of the dynamin superfamily that mediates mitochon
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nunoraimundo.bsky.social @nunoraimundo.bsky.social · 14/04/2026
More organelle conversations! www.sciencedirect.com/science/arti...
sciencedirect.com
Mitochondrial dysfunction triggers a maladaptive peroxisomal response driving lipid accumulation
Mitochondria and peroxisomes communicate to maintain lipid homeostasis, but how the latter adjust to mitochondrial dysfunction remains unclear. Here, …
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Natalie Niemi @nieminm.bsky.social · 03/03/2026
Super excited to present out work at @mitotalks.bsky.social this Thursday!! Hope to see you there!
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Martin Ott lab @mitolab.bsky.social · 28/01/2026
We are hiring! Fully funded PhD position on an exciting project to understand a fundamental mechanism of mitochondrial biogenesis. We will primarily rely on cryo-EM and protein-biochemical approaches. Please share! More about us: martinottlab.com Apply here: web103.reachmee.com/ext/I005/103...
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mitotalks.bsky.social @mitotalks.bsky.social · 21/01/2026
5 years of MITOtalks! Feels like it was yesterday when @wanrooij20.bsky.social and @nunoraimundo.bsky.social opened the first MITOtalk to introduce @frezzalab.bsky.social. But it turns out FIVE YEARS have passed. That's 57 MITOtalks, 44 MITOchats, 6000+ followers. Onwards and upwards!
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Natalie Niemi @nieminm.bsky.social · 08/01/2026
Really thrilled to have our work on mitochondrial presequence strength out today @jcb.org. We establish quantitative parameters to better define "strong" and "weak" presequences both in vitro and in vivo. This work was spearheaded by the ever talented Youmian Yan, a BBSB graduate student in my lab.
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Sam Lewis, Ph.D. @samlewis.bsky.social · 18/12/2025
⚡️Mitochondria make ATP, the energy that powers life. But in neurons, with axons up to a meter long, how do these tiny power plants stay functional in the right places? We went looking. 1/n www.biorxiv.org/content/10.6...
biorxiv.org
Self-renewal of neuronal mitochondria through asymmetric division
Mitochondrial ATP production is essential for life. Mitochondrial function depends on the spatio-temporal coordination of nuclear and mitochondrial genome expression, yet how this coordination occurs ...
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David Pla Martin @dplamartin.bsky.social · 12/12/2025
We are hiring!. If you hold a PhD in natural science and are passionate about mitochondria, reach out!
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Heidi M McBride @mitodynamics.bsky.social · 14/10/2025
New paper - MAPL strikes again! Interested in mitochondrial signalling, inflammation, lysosome biology, pyroptosis, and Parkinson's disease? Have a look, there's something for everyone! Feeling grateful! @mitocollier.bsky.social Funded by #CIHR, @asapresearch.parkinsonsroadmap.org. rdcu.be/eKKz1 🇨🇦
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Thompson Lab @jthompsonlab.bsky.social · 18/09/2025
We have a new preprint! A major part of Taylor's PhD research is now available to read on bioRxiv: www.biorxiv.org/content/10.1...
biorxiv.org
Hyper-proliferation of Adipose Progenitors During Developmental Adipogenesis Programs Higher Adipocyte Number and Early-onset Obesity in Offspring Born to Obese Dams
Being born to a mother who was obese during pregnancy is one of the strongest predictors of early onset obesity and metabolic syndrome. To identify the developmental mechanism linking maternal obesity...
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Shutt Lab @mitomorph.bsky.social · 03/09/2025
Congrats Jonathan!
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bioRxiv Cell Biology @biorxiv-cellbio.bsky.social · 27/06/2025
Drug Repurposing Screen Identifies an HRI Activating Compound that Promotes Adaptive Mitochondrial Remodeling in MFN2-deficient Cells www.biorxiv.org/content/10.1101/202…
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Shutt Lab @mitomorph.bsky.social · 27/06/2025
Thanks for including us in this exciting work! Looking forward to the next stages of this fun collaboration.
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Shutt Lab @mitomorph.bsky.social · 03/06/2025
Congrats to ShuttLab PhD student Mashiat Zaman @mashiatzaman.bsky.social on receiving an award for his short talk at the recent CSMB-PRinCE meeting in Ottawa
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A. Phillip West @westlabmito.bsky.social · 01/06/2025
Delighted to share our paper describing how type I interferon promotes caspase-11 hyperactivity in models of PolG-related mitochondrial disease. Thanks to all co-authors and the POLG Foundation for for their support. www.nature.com/articles/s41...
nature.com
Caspase-11 drives macrophage hyperinflammation in models of Polg-related mitochondrial disease - Nature Communications
Mitochondrial diseases lead to chronic health impairment, aggravated by infections and other environmental exposures. Here authors show, in a mouse model of polymerase gamma (Polg)-related mitochondri...
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Natalie Niemi @nieminm.bsky.social · 29/05/2025
Very excited to share our latest work, “Mitochondrial presequences harbor variable strengths to maintain organellar function,” led by the fantastically talented @washubbsb.bsky.social graduate student Youmian Yan. A 🧵 www.biorxiv.org/content/10.1...
biorxiv.org
Mitochondrial presequences harbor variable strengths to maintain organellar function
Hundreds of mitochondrial-destined proteins rely on N-terminal presequences for organellar targeting and import. While generally described as positively charged amphipathic helices, presequences lack ...
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Hansi Weissensteiner @whansi.bsky.social · 22/05/2025
Mitochondria Are More Than Powerhouses—They’re the Motherboard of the Cell great work by Martin Picard www.scientificamerican.com/article/why-...
scientificamerican.com
The Hidden Social Lives of Mitochondria
When these energy-giving organelles thrive, so do we
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Journal of Cell Science @jcellsci.bsky.social · 15/05/2025
Our Special Issue: Cell Biology of Mitochondria is complete. Explore our ToC: journals.biologists.com/jcs/issue/13... Our cover image highlights mitochondria (magenta) and DNA (cyan) in glioblastoma cells from Buckley et al. journals.biologists.com/jcs/article/... #JCSMitoSI #Mitochondria
Journal of Cell Science cover 
Special Issue on Cell Biology of Mitochondria
Guest Editors: Ana J. Garcia-Saez and Heidi McBride
Image of mitochondria (magenta) and DNA (cyan) in glioblastoma cells
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Shutt Lab @mitomorph.bsky.social · 13/05/2025
Happy to see this fun piece finally out. Congrats to Laurie for bringing this all together and thanks to Martin for his contributions.
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Danielle Grotjahn @nanigrotjahn.bsky.social · 01/05/2025
🚨New preprint!🚨 #teamtomo We expanded Surface Morphometrics to quantify membrane thickness from cryo-ET—revealing local variation across organelles. Led by the lab’s first grad student, @mmedina300kv.bsky.social (defending Monday! 🍾) w/ @attychang.bsky.social @hamid13r.bsky.social & @tomo.science
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A. Phillip West @westlabmito.bsky.social · 27/04/2025
Excited to call your attention to a new Fusion Conference this October in Malta. #IOSCD25 will cover: • Organelle Crosstalk • DNA Damage Responses & Inflammation • Organelles in Innate Immune Signaling • Organelle Communication in Disease and Aging More here: bit.ly/4jI458f @fusionconf.bsky.social
bit.ly
Inter-organelle Stress Communication in Inflammation & Disease Conference | Fusion Conferences
Our scientific research conferences support the development of physical, medical and life sciences, providing a powerful platform that encourages discussion and collaboration in luxury locations acros...
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Life Science Alliance @lsajournal.org · 11/04/2025
This work characterizes the Q367H variant in MFN2, identified in a patient with myopathy but no peripheral, and shows a novel way in which MFN2 dysfunction causes disease by promoting mtDNA release and subsequent inflammation @mitomorph.bsky.social www.life-science-alliance.org/content/8/6/...
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Danielle Grotjahn @nanigrotjahn.bsky.social · 09/04/2025
I know print journals aren't exactly on everyone's radar these days, but we’re still geeking out that our latest study—led by the brilliant @attychang.bsky.social—landed the cover of the April issue of JCB! 🤩 @zidlab.bsky.social @tomo.science @hamid13r.bsky.social
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Life Science Alliance @lsajournal.org · 04/04/2025
New work from Zaman et al., in the Shutt Lab @mitomorph.bsky.social, describes a novel variant in MFN2 linked to mtDNA-mediated inflammation and muscle myopathy www.life-science-alliance.org/content/8/6/...
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David Pla Martin @dplamartin.bsky.social · 04/04/2025
Are u tired of reading about tariffs? Then take a look to our last work! @science.org www.science.org/doi/10.1126/...
science.org
Retromer promotes the lysosomal turnover of mtDNA
Lysosomal uptake of mtDNA controls mitochondrial quality.
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David Pla Martin @dplamartin.bsky.social · 03/04/2025
A novel pathomechanism connected to mtDNA-mediated inflammation for CMT2A www.life-science-alliance.org/content/8/6/...
life-science-alliance.org
The MFN2 Q367H variant reveals a novel pathomechanism connected to mtDNA-mediated inflammation
Pathogenic variants in the mitochondrial protein MFN2 are typically associated with a peripheral neuropathy phenotype, but can also cause a variety of additional pathologies including myopathy. Here, ...
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Shutt Lab @mitomorph.bsky.social · 03/04/2025
The main addition since our original pre-print is new work showing that when we re-express this variant in MFN2 KO cells, we still see mtDNA release, similar to what we observed in patient cells. This new data confirms the mtDNA release is mediated by the MFN2 variant.
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