the temporoammonic (TA) input to CA1 synapse is hyperexcitable in MeCP2 -/Y mice
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Bibliographic record
Abstract
The temporoammonic (TA) pathway provides input directly from layer III of the entorhinal cortex (ECIII) to the distal dendrites of CA1 pyramidal cells in the stratum lacunosum-moleculare (SLM) of the hippocampus. The TA synapse influences the firing of CA1 pyramidal neurons and modulates the flow of information to the hippocampus. Neurons in ECIII are degenerated in Rett Syndrome (RTT), thus the aim of this study is to investigate how the presence of the MeCP2 mutation alters properties of the TA-CA1 synapse using electrophysiological characterization of synaptic and network connectivity. Electrophysiological neuronal properties were assessed by making whole-cell patch clamp recordings. The SLM neurons in Mecp2-/Y mice were found to be hyperexcitable showing increased action potential firing rate, with a significantly larger sag potential and post inhibitory rebound potential observed compared to matched wild-types. Additionally, evoked EPSCs of CA1 pyramidal neurons were significantly larger when the TA-CA1 pathway was stimulated, with no change in evoked IPSCs compared to wild-types. Moreover, the reversal potential for GABA (EGABA) was measured using a high intracellular chloride concentration (30mM) and found to be depolarized compared to wild-types controls. Finally, to assess network connectivity we examined hippocampal long-term potentiation induction and paired pulse ratio which were both found to be unaffected in TA-CA1 pathway in the MeCP2-/Y mouse. Taken together, the data demonstrates increased intrinsic excitability of the CA1 pyramidal neurons, revealing a potential mechanism of changes in GABA activity and provide preliminary evidence suggesting that targeting this phenotype may rescue neuronal abnormality and disease progression.
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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 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.012 | 0.001 |
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