Early afferent signaling in the outer plexiform layer regulates development of horizontal cell morphology
Why this work is in the frame
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Bibliographic record
Abstract
The dendritic patterning of retinal horizontal cells has been shown to be specified by the cone photoreceptor afferents. The present investigation has addressed whether this specification is due to visually dependent synaptic transmission in the outer plexiform layer or to some other early, pre-visual, neural activity. Individually labeled horizontal cells from dark-reared mice, as well as from mice carrying a mutation in the Cacna1f gene, which encodes the pore-forming calcium channel subunit Ca(v)1.4, were assessed for various morphological features. The dark-reared mice showed no alteration in any of these features, despite showing a compromised maximal voltage response in the electroretinograms. The retinas of Cacna1f mutant mice, by contrast, showed conspicuous morphological changes that mimicked the effects observed previously in coneless transgenic mice. These changes were present as early as postnatal day 10, when the shape and density of the cone pedicles appeared normal. Ultrastructurally, however, the pedicles at this early stage, as well as in maturity, lacked synaptic ribbons and the invaginations associated with postsynaptic processes. These results suggest a role for this calcium channel subunit in ribbon assembly in addition to its role in modulating calcium influx and glutamate release. Together, they suggest a complex cascade of interactions between developing cone pedicles and horizontal cell dendrites involving early spontaneous activity, dendritic attraction, ribbon assembly, and pedicle invagination.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it