Neurotransmitter Levels and Synaptic Strength at the<i>Drosophila</i>Larval Neuromuscular Junction are not Altered by Mutation in the<i>Sluggish-a</i>Gene, Which Encodes Proline Oxidase and Affects Adult Locomotion
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
The sluggish-A (slgA) gene of Drosophila melanogaster has been shown to encode for the enzyme proline oxidase, a mitochondrial enzyme which catalyzes the first step in the conversion of L-proline to L-glutamate. The slgA transcript is expressed in both larval and adult Drosophila melanogaster. Mutations in this gene lead to reduced proline oxidase activity and an elevation of free proline levels. Adult mutant flies show a striking reduction of motor activity. Since proline oxidase may contribute to the supply of the neurotransmitter glutamate in the nervous system, a reduction in proline oxidase activity could reduce neural glutamate pools and affect synaptic transmission in neurons utilizing glutamate as a transmitter, including peripheral motor neurons. We tested the hypothesis that glutamate, and synaptic transmission mediated by glutamate, are reduced at synapses of glutamatergic motor neurons in slgA mutants. Levels of glutamate and proline in different cell compartments, and functional properties of synaptic transmission were compared in slgA and control specimens. Proline is elevated in muscle cells of slgA mutants, indicating that the slgA gene regulates tissue proline levels. In nerve terminal varicosities, proline levels were low in both mutants and controls. Glutamate levels in nerve terminal varicosities of slgA mutants and controls were similar. In addition, we found that glutamatergic synaptic transmission at individual nerve endings and at the whole-cell level was similar in slgA mutants and controls. Thus, proline oxidase does not play a major role in generating neuronal glutamate pools at the Drosophila larval neuromuscular junction, and larval neuromuscular performance is not altered significantly in slgA mutants. Metabolic pathways other than that involving proline oxidase are able to sustain glutamatergic synaptic function in Drosophila larvae.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.000 | 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 it