Don Arnold
don-b-arnold.bsky.social
Don Arnold
@don-b-arnold.bsky.social
🇨🇦 Neurobiologist interested in toolmaking, synapses, and circuits.
Pinned
ATLAS, a rationally designed transsynaptic tracer is out today! Plasmids will soon be available on
@addgene.bsky.social
addgene nature.com/articles/s41...

Many thanks to first authors Jackie Rivera and Haoyang Huang, and to collaborators @blsabatini.bsky.social @beherring.bsky.social
ATLAS: a rationally designed anterograde transsynaptic tracer - Nature Methods
ATLAS is a tool for circuit tracing, demonstrated here in rodents. It allows anterograde transsynaptic tracing, starting from genetically defined neurons.
nature.com
Reposted by Don Arnold
Excited to report the identification of small molecule inhibitors of OTOP1 and their binding sites. Congratulations to first authors Batuuji Burendei from Ward/Forli labs at TSRI and Josh Kaplan for great team work! rdcu.be/eMpV9
Structure-guided discovery of Otopetrin 1 inhibitors reveals druggable binding sites at the intrasubunit interface
Nature Communications - Otopetrins form proton channels in animals ranging from nematodes to humans. Here, authors identify small molecule inhibitors and characterize their binding in the...
rdcu.be
October 23, 2025 at 4:42 PM
Use this handy link to find the ATLAS plasmids at Addgene. Otherwise, they are kind of tricky to find.
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
June 12, 2025 at 4:24 PM
Reposted by Don Arnold
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
May 27, 2025 at 3:11 PM
Reposted by Don Arnold
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!
May 22, 2025 at 1:36 PM
ATLAS, a rationally designed transsynaptic tracer is out today! Plasmids will soon be available on
@addgene.bsky.social
addgene nature.com/articles/s41...

Many thanks to first authors Jackie Rivera and Haoyang Huang, and to collaborators @blsabatini.bsky.social @beherring.bsky.social
ATLAS: a rationally designed anterograde transsynaptic tracer - Nature Methods
ATLAS is a tool for circuit tracing, demonstrated here in rodents. It allows anterograde transsynaptic tracing, starting from genetically defined neurons.
nature.com
May 1, 2025 at 2:56 PM
New tools for ablating excitatory and inhibitory synapses quickly, specifically, and without toxicity elifesciences.org/digests/1037...
Manipulating neuronal circuits
Newly developed tools that eliminate specific synapses could make it easier for researchers to precisely control how neurons communicate in rodents.
elifesciences.org
April 30, 2025 at 7:39 PM
GO CANADA!!!!
February 20, 2025 at 4:42 PM
Reposted by Don Arnold
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.
January 30, 2025 at 1:18 AM
Reposted by Don Arnold
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.
January 28, 2025 at 12:48 PM
Reposted by Don Arnold
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.
January 23, 2025 at 2:48 PM
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.
December 8, 2024 at 7:50 PM
Reposted by Don Arnold
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...
November 30, 2024 at 5:26 PM
Reposted by Don Arnold
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.
December 4, 2024 at 4:59 AM
Reposted by Don Arnold
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
October 27, 2024 at 8:09 PM