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Posts by Sam Lewis, Ph.D.

2 days ago 11334 3024 41 11

I’m looking for an automated way to read others’s scientific data without giving credit or acknowledgement, and also claim full credit for insights from it. And I want it to have a fitting name

OAI: say no more

4 days ago 829 322 10 6

There's also a kind of intentional myopia in focusing just on higher ed when diagnosing "declining trust." Only one of these explanations also has something to say about why there's simultaneously declining trust in elections, public health authorities, etc, in the same spaces over the same period

4 days ago 147 33 3 6

I'm excited to tell you about the most recent preprint in my lab, demonstrating that a conserved spindle matrix protein, NPP-21/TPR, is required for the stronger checkpoint in germline cells during embryogenesis in C. elegans

5 days ago 61 21 7 0
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Diffusive spreading across dynamic mitochondrial network architectures | PNAS In eukaryotic cells, mitochondria form networks that range from highly fused interconnected structures to fragmented populations of individual orga...

Congrats to Keaton, Cam, Lena, and all coauthors! 6/6
www.pnas.org/doi/10.1073/...

1 week ago 4 1 0 0

By analyzing mito dynamics across a variety of human cell lines, Lewis lab PhD candidate Cam found how cells can access both regimes, highlighting how mitochondrial dynamics actively tune intracellular transport!! 🚀 5/

1 week ago 2 1 1 0
Plot of steady-state network content vs decay time across several mitochondrial connectivity regimes.

Plot of steady-state network content vs decay time across several mitochondrial connectivity regimes.

As mito network connectivity increases, transport shifts from 3D spreading between clusters (“social”) to lower-dimensional diffusion within continuous networks (“physical”).

📊 This provides a unifying way to think about mitochondrial organization in the context of cell geometry! 4/

1 week ago 2 1 1 0
Segmented mitochondria from 3 different types of cells, with sub-networks highlighted in bright colors.

Segmented mitochondria from 3 different types of cells, with sub-networks highlighted in bright colors.

In this work, Keaton from the Kolover lab shows that spreading of molecules like proteins, RNA, lipids, and ions depends on key timescales ⏱️: how often mitochondria meet, fuse, and divide. 3/

1 week ago 1 0 1 0

Mitochondria aren’t static; they form dynamic networks that constantly fuse, divide, and move. 🔄

Depending on the conditions, they can behave like a tightly connected “physical network” or a loose “social network” of transient interactions. 2/

1 week ago 1 0 1 0
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Diffusive spreading across dynamic mitochondrial network architectures | PNAS In eukaryotic cells, mitochondria form networks that range from highly fused interconnected structures to fragmented populations of individual orga...

Excited to share a new collaborative paper with Lena Koslover's team, fueled by @chanzuckerberg.bsky.social Metabolism Across Scales Program 🧪 1/
www.pnas.org/doi/10.1073/...

1 week ago 28 12 1 0
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where did you order these?

1 week ago 1 0 1 0

I had a wonderful time connecting with the research community at the Buck last week! Special thanks to Saam Doroodian, Malene Hansen, and Ashley Webb!

4 weeks ago 2 0 0 0
NOT-GM-26-002: Notice of NIGMS Participation in PA-25-422 "Ruth L. Kirschstein National Research Service Award (NRSA) Individual Predoctoral Fellowship (Parent F31)" NIH Funding Opportunities and Notices in the NIH Guide for Grants and Contracts: Notice of NIGMS Participation in PA-25-422

NIGMS is signed onto the F31 NOFO. grants.nih.gov/grants/guide...

1 month ago 47 27 3 2
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MitoTracker transfers from astrocytes to neurons independently of mitochondria The mitochondrial dye MitoTracker is commonly used to investigate intercellular mitochondrial transfer (IMT), particularly between astrocytes and neurons. Hole et al. compare MitoTracker with a geneti...

⚡️We are excited to share a new paper from the lab by @drkhole.bsky.social in @cp-cellrepmethods.bsky.social - suggesting MitoTracker dyes are not a reliable tool for detecting intercellular mitochondrial transfer❗️ www.cell.com/cell-reports...

1 month ago 41 24 1 2
1 month ago 3 0 0 0
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Some molecular machines, like ribosomes, can persist for long periods of time in cells.

Could molecular aging of ribosomes shape how proteins are made?

In our new preprint we track ribosomes as they age in cells and uncover unexpected effects on translation (1/10)

www.biorxiv.org/content/10.6...

1 month ago 122 50 4 5
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On my way to DC and looking forward to this exciting mini-symposium! #ASBMB26

1 month ago 10 4 0 0
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Megan Doty et al discovered that myelin remains for weeks after cortical axons degenerate. We call the sheaths without an axon de-axoned myelin. During the slow, asynchronous, degeneration, microglia don't play a major role in clearing the axon or de-axoned myelin. www.science.org/doi/10.1126/...

1 month ago 30 9 1 0
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Organelle-Targeted Laurdans Measure Heterogeneity in Subcellular Membranes and Their Responses to Saturated Lipid Stress - PubMed Organelles feature characteristic lipid compositions that lead to differences in membrane properties. In cells, membrane ordering and fluidity are commonly measured using the solvatochromic dye Laurdan, whose fluorescence is sensitive to lipid packing. As a general lipophilic dye, Laurdan stains all …

seen this? pubmed.ncbi.nlm.nih.gov/39069657/

1 month ago 0 0 1 0
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Yes
bsky.app/profile/biot...

2 months ago 2 0 1 0

No Kings includes Draft Kings

2 months ago 26046 6085 183 109
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We are organizing a mini-symposium on "Membrane and Organelle Dynamics" at ASBMB 2026! #ASBMB @asbmb.bsky.social
@aydinlab.bsky.social and I have put together a fantastic lineup of speakers for Day 1 morning. Come learn about some cutting-edge research in the field.

2 months ago 13 5 0 1

Thank you, Lorena! Happy to see this online 😁 🎉

2 months ago 3 0 0 0
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Self-renewal of neuronal mitochondria through asymmetric division - preLights Neurons contain “hotspots” for mitochondrial biogenesis at distal branch points

Check out my first @prelights.bsky.social article, based on some great work done by Dr. Tejashree Waingankar & @samlewis.bsky.social at UC Berkeley 🔬🧬🧠

prelights.biologists.com/highlights/s...

2 months ago 9 7 2 1
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How does molecular valency shape condensate assembly and function? We used the CO2-fixing organelle in algae—the pyrenoid—to find out… 🧵

Preprint here!:
www.biorxiv.org/content/10.6...

@cellarchlab.com @phaips.vd.st @biologyatyork.bsky.social
#Rubisco #PhaseSeparation #Condensates #Pyrenoid

2 months ago 78 37 1 5

Thank you!

2 months ago 0 0 0 0

@focalplane.bsky.social I recommend www.biorxiv.org/content/10.6...

2 months ago 2 1 1 0
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I'm reading this now based on your recommendation, and it feels like listening to Bjork for the first time

3 months ago 2 0 1 0

I found me!

3 months ago 13 1 0 0

A lot of the time I would inject to guide them, as in "the authors chose to measure X to address their hypothesis; could they have measured something else instead? if they had measured Y, would that be a more direct test of their model or less direct, in your opinion?" etc, etc

3 months ago 2 0 0 0