SEPTIN9 locally activates the RhoGEF ARHGEF18 to promote early stages of mitochondrial fission
Bibliographic record
Abstract
Mitochondria continually undergo fission to maintain their network and health. Nascent fission sites are marked by the ER, which facilitates actin polymerization to drive calcium flux into the mitochondrion and constrict the inner mitochondrial membrane. Septins are a major eukaryotic cytoskeleton component that forms filaments that can both directly and indirectly modulate other cytoskeleton components, including actin. Septins have been implicated in mitochondrial fission; however, a connection between septins and the regulation of cytoskeletal machinery driving fission is not known. We find that SEPTIN9 is present at mitochondrial fission sites from its early stages with the ER and prior to the fission factor dynamin-related protein 1 (DRP1). SEPTIN9 has an isoform-specific role in fission, dependent on its N-terminal interaction to activate a Rho guanine nucleotide exchange factor, ARHGEF18. Without SEPTIN9, mitochondrial calcium influx is impaired, indicating SEPTIN9-containing octamers play a critical role in the early stages of fission.
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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) | 0.000 | 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) | 0.002 | 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".