Interphase Microtubules Safeguard Mitotic Progression by Suppressing an Aurora B-Dependent Arrest Induced by DNA Replication Stress
Bibliographic record
Abstract
The segregation of chromosomes is a critical step during cell division. This process is driven by the elongation of spindle microtubules and is tightly regulated by checkpoint mechanisms. It is unknown whether microtubules affect checkpoint responses as passive contributors or active regulators of the process. We show here that interphase microtubules are essential to temporally restrict the effects of DNA replication stress to S phase in Saccharomyces cerevisiae. Tubulin mutants hypersensitive to DNA damage experience a strong but delayed mitotic checkpoint arrest after exposure to genotoxic stress in S phase. This untimely arrest is dependent on the Aurora B kinase but, surprisingly, not on the DNA damage checkpoint. Impaired microtubule-kinetochore interaction is the apparent cause for this unusual phenotype. Collectively, our results reveal that core components of microtubules potentiate the detection of DNA lesions created in S phase, thereby suppressing untimely activation of mitotic checkpoints after DNA replication stress.
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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) | 0.001 | 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 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".