Don Arnold
@don-b-arnold.bsky.social
280 followers 280 following 16 posts
🇨🇦 Neurobiologist interested in toolmaking, synapses, and circuits.
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don-b-arnold.bsky.social
Hi Farin, we have had mixed results with transgenic reporters. I would say that using them with ATLAS is “off-label”, but you are welcome to try. We are currently trying to figure out what is causing the variation and hope to be able to publish something on it in the near future.
don-b-arnold.bsky.social
ATLAS is more specific than previous anterograde tracers like AAV1 because it can trace from genetically determined cells and is strictly transsynaptic. It is not as efficient as rabies (maybe 50%), but also likely causes less toxicity.
don-b-arnold.bsky.social
Use this handy link to find the ATLAS plasmids at Addgene. Otherwise, they are kind of tricky to find.
addgene.bsky.social
AAV plasmids for ATLAS, a rationally designed transsynaptic tracer, are now available at Addgene. They are also available for Packaged on Request, our on-demand AAV packaging service.
www.addgene.org/brow...
@don-b-arnold.bsky.social@blsabatini.bsky.social
@beherring.bsky.social
Reposted by Don Arnold
elife.bsky.social
Want to edit brain circuits with precision?

🧠 A new toolbox lets researchers erase specific excitatory or inhibitory synapses on demand, using light or chemicals.
Manipulating neuronal circuits
Newly developed tools that eliminate specific synapses could make it easier for researchers to precisely control how neurons communicate in rodents.
buff.ly
don-b-arnold.bsky.social
Only problem is that it doesn’t work in cells without synaptotagmin 1 (inhibitory neurons, dopaminergic neurons, etc.). Any chance you have developed nanobodies against other synaptotagmins?
don-b-arnold.bsky.social
Synaptotagmin 1 nanobody is great! Far superior to vamp2 overexpression.
Reposted by Don Arnold
ishmailsaboor.bsky.social
Congrats to my undergrad student Amanda on graduating yesterday. She even got to bring her family by the lab to see where she's been working. We also recently learned that Amanda has been awarded a Fulbright!
don-b-arnold.bsky.social
I signed up for research kick on march 19 for $30/month. Now when i sign in it has no memory of me and there doesn’t seem to be a way of stopping the payments. You can’t be messaged, so i need to do this in public unfortunately. Please give me instructions for how to stop my subscription.
Reposted by Don Arnold
altnih4science.bsky.social
This account is for sharing info with US scientists, both extramural and intramural to NIH, about attacks on science in the US.

Education is power, and we can help advocate for science and medicine together. 💪🧪

We are a team of NIH people. Please ask us questions you might have.
Reposted by Don Arnold
sbagen.bsky.social
I see some suggestions, in the reporting regarding the OMB impoundment order, that a mere delay in spending appropriated funds is legal. But that's not really true. The delay OMB has ordered specifically contradicts the Impoundment Control Act. A thread.
Reposted by Don Arnold
bwjones.bsky.social
I’m scrolling through news a day after the Trump admin shut down coms, travel, and function from the National Institutes of Health (NIH), and I don’t see any mainstream media coverage for an impact upon our society & economy that is going to be multiples of 100s of billions and science and health.
don-b-arnold.bsky.social
He was just being honest- probably a mistake. He also said some very nice things about Barkley. Must be difficult to watch others do what you are no longer able to.
don-b-arnold.bsky.social
Thanks, Nathalie! Hope you and Emre are keeping warm and enjoying the northern lights.
don-b-arnold.bsky.social
The problem seems to be that even though it is possible to acquire followers on bluesky, engagement seems to be <10% of what it was on X.
don-b-arnold.bsky.social
We believe that these tools will work even if they don’t have an impact factor.
don-b-arnold.bsky.social
Our new paper on recombinant tools for reversibly ablating excitatory and inhibitory synapses is out in eLife. Congrats to first author, Aida Bareghamyan!
elifesciences.org/reviewed-pre...

Plasmids, and hopefully AAVs, will be available soon on Addgene.
Reposted by Don Arnold
emilyliman.bsky.social
For your thanksgiving reading pleasure: OTOP1, the sour and ammonium sensor in taste cells, is apically localized, and not restricted to Type III taste cells. www.jneurosci.org/content/earl...
Taste bud showing OTOP in magenta and actin in green, demonstrating apical localization of OTOP1.
Reposted by Don Arnold
amanglik.bsky.social
First post on bsky to highlight our latest work on smell receptors (www.nature.com/articles/s41...). Odorant receptors are notoriously challenging to work with - we used a classic strategy from protein engineering to get a peek into how these receptors recognize such a diversity of smells.
Reposted by Don Arnold
jakefwatson.bsky.social
Recording synaptic minis (mEPSCs)? We have a new paper trying to better understand how recorded datasets match synaptic changes. In short, they don't..
More info below, and the preprint here:
biorxiv.org/content/10.1101/2024.10.26.620084v1
Simulated mPSC data
don-b-arnold.bsky.social
Sorry to hear that. It’s incredibly frustrating when innovation is penalized.