Georgios Kafetzis
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gkafetzis.bsky.social
Georgios Kafetzis
@gkafetzis.bsky.social
PhD Student@University of Sussex w/ Tom Baden
MSc Neuroscience@University of Tübingen w/ Thomas Euler
Interested in visual neuroscience, neural design, evolution.
Pinned
👁️The retina — strikingly conserved across vertebrates, but an oddity among bilaterians!

So how did it evolve?

With @mikebok.bsky.social, @neurofishh.bsky.social and @denilsson.bsky.social, we argue that retinal complexity may 𝑝𝑟𝑒𝑑𝑎𝑡𝑒 𝑡ℎ𝑒 𝑒𝑦𝑒 𝑖𝑡𝑠𝑒𝑙𝑓.

www.biorxiv.org/content/10.1...
1/n
a black and white dog is sitting on a couch with its tongue sticking out .
ALT: a black and white dog is sitting on a couch with its tongue sticking out .
media.tenor.com
Reposted by Georgios Kafetzis
I’m very excited to announce that a part of my PhD thesis project is now a preprint! In this paper, we show how spontaneous activity prior to visual experience shapes neural circuits in the retina. (1/11)
Retinal waves shape starburst amacrine cell dendrite development through a direction-selective dendritic computation https://www.biorxiv.org/content/10.64898/2026.02.02.701812v1
February 5, 2026 at 3:17 AM
Reposted by Georgios Kafetzis
We are thrilled that our study on the evolution of gene regulation in mammalian cerebellum development – led by @ioansarr.bsky.social, @marisepp.bsky.social and @tyamadat.bsky.social, in collaboration with @steinaerts.bsky.social – is now out in @ScienceMagazine! www.science.org/doi/10.1126/...
January 29, 2026 at 7:23 PM
Reposted by Georgios Kafetzis
Why do some worms graze on bacteria while others hunt and kill?
Our study, published today in Nature, reveals how predatory aggression evolved in nematodes.
Led by @gunizgozeeren.bsky.social and @leoboeger.bsky.social across the @jameslightfoot.bsky.social and @monikakscholz.bsky.social labs.
Predatory aggression evolved through adaptations to noradrenergic circuits - Nature
Noradrenergic circuits support and balance aggressive behavioural states in predatory nematodes, distinguish predatory from non-predatory nematode species and are associated with the evolution of comp...
www.nature.com
January 21, 2026 at 4:31 PM
Reposted by Georgios Kafetzis
New paper from the lab, led by @ronjabigge.bsky.social, in collaboration with Kentaro Arikawa. We reconcile contrast and spatial processing functions of lamina monopolar cells by integrating 3D morphology, connectivity and neurophysiology in the hummingbird hawkmoth. tinyurl.com/mvnh3325
For more 👇
ScienceDirect.com | Science, health and medical journals, full text articles and books.
authors.elsevier.com
January 19, 2026 at 2:19 PM
Reposted by Georgios Kafetzis
How does our visual system process natural scenes ? How can we approach this question ?
Happy to share this recent review written with Samuele Virgili where we ask these questions at the level of the retina.

www.sciencedirect.com/science/arti...
Retinal processing of natural scenes: challenges ahead
While substantial knowledge exists about the way the retina processes simple stimuli, our understanding of how the retina processes natural stimuli re…
www.sciencedirect.com
January 14, 2026 at 9:36 PM
Reposted by Georgios Kafetzis
1/10 New preprint on bioRxiv
Nanodiamonds for spatial resolution benchmarking in two-photon microscopy

We introduce nanodiamond-based phantoms as a robust, reusable alternative to bead–agarose samples for PSF calibration.

www.biorxiv.org/content/10.6...
Nanodiamonds for spatial resolution benchmarking in two-photon microscopy
Reliable and reproducible measurement of spatial resolution is essential for validating and comparing the performance of two-photon microscopy systems. We present fluorescent nanodiamonds as robust, photostable, reusable, and biocompatible probes for benchmarking spatial resolution. Owing to their nanoscale dimensions and stable fluorescence, nanodiamonds act as near-ideal point-like emitters, enabling accurate characterisation of the point spread function across varying imaging conditions. We demonstrate that nanodiamond-based phantoms serve as a reliable alternative to conventional fluorescent beads embedded in agarose, while at the same time offering advantages in stability and optical properties. Our results position nanodiamond phantoms as a next-generation calibration material that bridges ease of use and reproducibility, advancing quantitative imaging and cross-platform comparability in modern fluorescence microscopy. ### Competing Interest Statement The authors have declared no competing interest. Wellcome Trust, https://ror.org/029chgv08, Investigator Award in Science 220277/Z20/Z European Research Council, https://ror.org/0472cxd90, ERC-StG “NeuroVisEco” 677687, ERC AdG “Cones4Action” covered under the UK’s EPSRC guarantee scheme EP/Z533981/1 UK Research and Innovation, https://ror.org/001aqnf71, BBSRC, BB/R014817/1, BBSRC, BB/W013509/1 International Human Frontier Science Program Organization, https://ror.org/02ebx7v45, RGP001/2025 Leverhulme Trust, https://ror.org/012mzw131, PLP-2017-005, RPG-2021-026, RPG-2-23-042 Lister Institute of Preventive Medicine Gdańsk University of Technology, https://ror.org/006x4sc24, Nobelium DEC-4/1/2024/IDUB/I.1a/No, Platinum 1/1/2025/IDUB/I.1B/Pt
www.biorxiv.org
January 14, 2026 at 3:29 PM
Reposted by Georgios Kafetzis
I am very happy (and a bit scared) to present to you what we have been working on over the last 4 years. This manuscript is exactly what I dreamt of when I started the lab and I could not be happier and prouder of the outcome!
Evolutionary dynamics of temporal transcription factor series in the insect optic lobe https://www.biorxiv.org/content/10.64898/2026.01.08.698497v1
January 10, 2026 at 9:43 AM
Reposted by Georgios Kafetzis
Do direction and orientation preferences form maps in the mouse superior colliculus (SC)?
We examined how motion and orientation tuning are organized in SC neurons and their retinal inputs—and how the retinal topography is transformed by collicular circuits.
tinyurl.com/mr2zt5rm

🧵👇
December 24, 2025 at 1:41 PM
Reposted by Georgios Kafetzis
Ever wanted to know how the visual system of a long distance migratory moth looks like? Then you'll find your answers in our new paper. Finally out, after about a decade of collecting data by a group af amazing co-authors. Find it here, open access: link.springer.com/article/10.1...
December 18, 2025 at 2:16 PM
Nice to see this published, congrats all🎉
December 17, 2025 at 11:41 AM
Reposted by Georgios Kafetzis
*First preprint from our lab* !!!!!
How does the brain learn to anchor its internal sense of direction to the outside world? 🧭
led by Mark Plitt @markplitt.bsky.social & Dan Turner-Evans, w/ Vivek Jayaraman:
“Octopamine instructs head direction plasticity” www.biorxiv.org/content/10.6...
Thread ⬇️
December 15, 2025 at 6:26 PM
Reposted by Georgios Kafetzis
Freshly out at @natcomms.nature.com ! Our @univie.ac.at @awi.de @viennabiocenter.bsky.social @ercgrantees.bsky.social research into neurogenic plasticity of adult worm brains, and similarities in stem cells supporting growth of camera-type eyes. www.nature.com/articles/s41... [1/7]
December 1, 2025 at 10:51 AM
Reposted by Georgios Kafetzis
Extremely proud to share our publication on S-cone circuitry in the ground squirrel, newly available this week in PNAS. We've been staring at these reconstructions for a long time, and I'm excited for others to see the results. 1/n

www.pnas.org/doi/10.1073/...
S-cone-specific circuitry in the outer plexiform layer of a cone-dominant mammal | PNAS
In the vertebrate retina, short wavelength-sensitive S-cones and their downstream interneurons play unique roles in both image forming and non-imag...
www.pnas.org
December 3, 2025 at 3:36 PM
Reposted by Georgios Kafetzis
Ending my #FluorescenceFriday with this beautiful avian retina image depicting the beautiful stratification in the avian eyes.
This is where complexity meets art.
#retina #avian #bird #plexiformlayer
November 14, 2025 at 4:18 PM
Reposted by Georgios Kafetzis
November 13, 2025 at 7:23 PM
Reposted by Georgios Kafetzis
Happy to share Jialin's first publication. She did a great job exploring the transition to land in animals. Co-supervised by the great Jordi Paps and me and in collaboration with Davide Pisani and @phil-donoghue.bsky.social
November 13, 2025 at 3:18 PM
Reposted by Georgios Kafetzis
I am super happy to share that our project on training biophysical models with Jaxley is now published in Nature Methods: www.nature.com/articles/s41...
Jaxley: differentiable simulation enables large-scale training of detailed biophysical models of neural dynamics - Nature Methods
Jaxley is a versatile platform for biophysical modeling in neuroscience. It allows efficiently simulating large-scale biophysical models on CPUs, GPUs and TPUs. Model parameters can be optimized with ...
www.nature.com
November 13, 2025 at 12:38 PM
Reposted by Georgios Kafetzis
Our study, just published in #ScienceAdvances and funded by @hfspo.bsky.social, explores the post metamorphic cell composition of the sea urchin juvenile, revealing that its body is head-like. Long considered brainless creatures, they’re all brain instead!
www.science.org/doi/10.1126/...
Single-nucleus profiling highlights the all-brain echinoderm nervous system
A sea urchin is a head with a brain-like organization and a vertebrate-type retinal signature.
www.science.org
November 5, 2025 at 7:03 PM
Reposted by Georgios Kafetzis
We’re hiring! Join the Sivyer Lab at The University of Sydney as a Postdoctoral Research Fellow in Neurodegeneration within the Snow Vision Accelerator, a $50M initiative tackling glaucoma and optic nerve disease. iPSCs, electrophysiology, drug discovery, and gene therapy.
November 4, 2025 at 10:20 AM
Reposted by Georgios Kafetzis
Excited to share our paper now published in Cell!
'Zebrafish use spectral information to suppress the visual background'

Huge thanks to @neurofishh.bsky.social & @teuler.bsky.social

@cellpress.bsky.social @cp-cell.bsky.social

👇🏻
www.cell.com/cell/fulltex...
Zebrafish use spectral information to suppress the visual background
Vertebrate eyes first evolved in water, where spectral content rapidly fades with distance. Zebrafish exploit this loss by antagonizing cone signals to suppress the background, pointing to distance es...
www.cell.com
November 4, 2025 at 9:16 AM
Reposted by Georgios Kafetzis
Now out in Cell! Congratulations to all involved, especially
@chiarafornetto.bsky.social

For a breakdown, see the bluetorial from when we posted the preprint: bsky.app/profile/neur...

Funding: @erc.europa.eu @wellcometrust.bsky.social @ukri.org @leverhulme.ac.uk @thelisterinstitute.bsky.social
November 4, 2025 at 8:53 AM
Reposted by Georgios Kafetzis
First neurons didn’t appear overnight. We trace their roots to ancient secretory cells - showing how lifestyle & behavior shaped the evolution of first synapses.🧠🌊 #Evolution #Neuroscience

Our latest in @natrevneuro.nature.com
Link: rdcu.be/eMX3E

@jeffcolgren.bsky.social @msarscentre.bsky.social
The evolutionary origins of synaptic proteins and their changing roles in different organisms across evolution
Nature Reviews Neuroscience - Recent studies have shed further light on the evolutionary origins of chemical synapses, In this Review, Colgren and Burkhardt explore how ancient proteins were...
rdcu.be
October 27, 2025 at 6:48 PM
Reposted by Georgios Kafetzis
Did transposable elements shape brain evolution — and if so, which ones, and in which cell states and lineages? Led by @tyamadat.bsky.social, we explored this question in cerebellum development using sequence-based deep learning models!
www.biorxiv.org/content/10.1...
October 16, 2025 at 10:01 PM
Reposted by Georgios Kafetzis
Teresa Puthussery, a UC Berkeley vision scientist whose insights into the retina could one day help those with vision loss regain their sight, has been named a 2025 MacArthur “genius” Fellow. news.berkeley.edu/2025/10/08/v...
Vision scientist Teresa Puthussery receives MacArthur ‘genius’ award - Berkeley News
Puthussery’s discoveries about the retina are paving the way for new treatments for eye disease and vision loss
news.berkeley.edu
October 8, 2025 at 9:48 PM
Reposted by Georgios Kafetzis
Our latest manuscript is out, and this one tackles the problem of cellular aging in the retina, using comparative multiomic analysis of zebrafish, mouse, and humans. What led us to work on aging after studying development and regeneration? Explainer follows./1
www.biorxiv.org/content/10.1...
Comparative single-cell multiomic analysis reveals evolutionarily conserved and species-specific cellular mechanisms mediating natural retinal aging.
Biological age is a major risk factor in the development of common degenerative retinal diseases such as age-related macular degeneration and glaucoma. To systematically characterize molecular mechani...
www.biorxiv.org
September 12, 2025 at 7:04 PM