Circadian clock in the lateral habenula affects motor function in mice through the regulation of daily rhythms in the nigrostriatal pathway
Bibliographic record
Abstract
ABSTRACT Alterations to the dopaminergic system can have several consequences on behaviour such as the development of disorders like addiction, schizophrenia, and Parkinsons. The lateral habenula (LHb) is uniquely positioned to act on a large group of dopaminergic (DA) neurons, sending inhibitory signals both directly and indirectly to the ventral tegmental area (VTA) and the substantia nigra (SN). Additionally, the LHb houses a circadian clock that appears to function independently from the central circadian pacemaker. We investigated the role of the LHb as a pacemaker for the production and release of DA along the nigrostriatal pathway. Using male and female Bmal1 floxed mice, we injected AAV-2/9 Cre-eGFP virus into the LHb to selectively knockout Bmal1 , a clock gene essential for clock functioning. We found a significant impact on motor functioning in both male and female knockout mice. Analysis of daily rhythms of expression of circadian clock genes and genes involved in DA synthesis, and liquid chromatography coupled mass spectrometry for striatal DA measurements revealed blunting of rhythms in the dorsal striatum (DS) and (SN) of knockout animals, that may contribute to the observed behavioural phenotype. As proper functioning of the striatum is likely maintained by a mutual interaction of the circadian clock and DAergic system, these findings support that disrupting the LHb clock can impact functioning of the nigrostriatal DA pathway.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.002 |
| Insufficient payload (model declined to judge) | 0.003 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), 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".