Laminar fate of cortical GABAergic interneurons is dependent on both birthdate and phenotype
Bibliographic record
Abstract
Pioneering work indicates that the final position of neurons in specific layers of the mammalian cerebral cortex is determined primarily by birthdate. Glutamatergic projection neurons are born in the cortical proliferative zones of the dorsal telencephalon, and follow an "inside-out" neurogenesis gradient: later-born cohorts migrate radially past earlier-born neurons to populate more superficial layers. GABAergic interneurons, the major source of cortical inhibition, comprise a heterogeneous population and are produced in proliferative zones of the ventral telencephalon. Mechanisms by which interneuron subclasses find appropriate layer-specific cortical addresses remain largely unexplored. Major cortical interneuron subclasses can be identified based on expression of distinct calcium-binding proteins including parvalbumin, calretinin, or calbindin. We determined whether cortical layer-patterning of interneurons is dependent on phenotype. Parvalbumin-positive interneurons populate cortical layers with an inside-out gradient, and birthdate is isochronous to projection neurons in the same layers. In contrast, another major GABAergic subtype, labeled using calretinin, populates the cerebral cortex using an opposite "outside-in" gradient, heterochronous to neighboring neurons. In addition to birthdate, phenotype is also a determinant of cortical patterning. Discovery of a cortical subpopulation that does not follow the well-established inside-out gradient has important implications for mechanisms of layer formation in the cerebral cortex.
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How this classification was reachedexpand
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 | 0.001 |
| 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".