Kelsey Tyssowski
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kelseytea.bsky.social
Kelsey Tyssowski
@kelseytea.bsky.social
genetic and neural basis of dexterity…in deer mice! | postdoc at Harvard OEB/MCB, BRAIN K99/R00 | plant grower, music maker, crafter, bike rider, sometimes mountain climber | she/her

in search of a faculty job 🤓

https://ktyssowski.github.io/
Reposted by Kelsey Tyssowski
Second this.
We need more people saying this:

It’s not just US science and cancer cures at risk, it’s the whole US university system top to bottom.

CEU and Orban are their model. CEU is now gone from Hungary. And the response needed is public pushback, not quiet go-along-to-get-along.
Again, there is no plan for running our universities without federal funding, or foreign students, at scale. But the public has no idea about this because no. one. is. telling. them. this. They expect their kids are still going to be able to do all the things at college in the next 4 years, & well:
The entire business model of R1 public universities rests on 4 revenue sources:

1. Federal grants
2. Private gifts/endowments
3. Tuition (esp. from foreign students)
4. State $

For decades, 📈 in 1-3 offset a secular 📉 in 4. Now, 1 & 3 are being decimated & 4 ain't coming back. The math is clear.
November 27, 2025 at 4:20 PM
Congrats!! Was fun to hear about this at SfN!
November 19, 2025 at 7:04 PM
ha! yeah the late breaking posters are a trek 😩
November 18, 2025 at 4:45 PM
Thanks, Arkarup! sorry you’re not able to be here—I’m hoping to make it to your labs’ posters!
November 17, 2025 at 5:54 PM
Thanks!!
November 15, 2025 at 2:02 AM
cool -- looks interesting! thanks!
November 13, 2025 at 3:00 AM
we don't! but i think it's a great question and hope to do this experiment in the future
November 12, 2025 at 6:55 PM
Reposted by Kelsey Tyssowski
Just channeling Stephen J Gould: "I am, somehow, less interested in the weight and convolutions of Einstein's brain than in the near certainty that people of equal talent have lived and died in cotton fields and sweatshops"
November 8, 2025 at 12:12 AM
thanks for reading! we only looked at lab-raised populations, but there's a rich natural history literature about climbing in wild deer mice, and wild forest mice are better climbers. hand dexterity is less well studied. urban vs populated, we don't know! but an interesting ? for sure!
October 28, 2025 at 3:14 PM
same, tbh!
October 27, 2025 at 5:29 PM
...probably i have too many thoughts for this format! but it's not entirely obvious to me how an increase here relates to expectations from primate evo - other than that RFA CSNs in rodents project to deeper spinal cord lamina than CFA CSNs, so perhaps more CSNs w/ fewer synapses to motor neurons
October 26, 2025 at 10:23 PM
cingulate cortex (as labeled by the allen) is medial/ventral to M2/RFA, and i haven't looked at the extent to which the pattern within the rostral ctx differs - but i could, and may better answer your ?. my understanding is that RFA is often thought of as a homologue of primate SMA/premotor ctx...
October 26, 2025 at 10:23 PM
we looked at all of cortex, but only neurons that project to C5-C7ish (b/c we labeled by retrograde AAV inj). we see more CSNs in what the allen atlas labels as M2 and S2, but not M1/S1. here's max intensity proj across cortex of labeled neurons -- just to clarify what i mean w/ area labels...
October 26, 2025 at 10:23 PM
there are more CSNs in RFA specifically! (we’re calling RFA m2 here). I don’t have a definitive answer on other spinal proj neurons (but preliminarily, i don’t think there’s a decrease). def very open to any feedback you have after reading!
October 25, 2025 at 1:25 AM
Thank you!!
October 25, 2025 at 1:00 AM
...which means that they don't completely diverge. but it's complicated. you could get a genetic change that stops them from mating with one another. natural selection is not entirely predictable.
October 24, 2025 at 5:48 PM
thank you! the question of "what is a species?" in these kinds of closely related populations is a bit hard to answer. but one thing we know is that there is some crossover between these populations in the wild, causing "gene flow", i.e., sharing of genetic info, between populations...
October 24, 2025 at 5:48 PM