Cyclin B3 and dynein heavy chain cooperate to increase fitness in the absence of<i>mdf-1/MAD1</i>in<i>Caenorhabditis elegans</i>
Bibliographic record
Abstract
Spindle assembly checkpoint (SAC) ensures genome stability by delaying anaphase onset until all the chromosomes have achieved proper spindle attachment. Once correct attachment has been achieved, SAC must be silenced. In the absence of mdf-1/MAD1, an essential SAC component, Caenorhabditis elegans cannot propagate beyond 3 generations. Previously, in a dog-1(gk10)/FANCJ mutator background, we isolated a suppressor of mdf-1(gk2) sterility (such-4) which allowed indefinite propagation in the absence of MDF-1. We showed that such-4 is a Cyclin B3 (cyb-3) duplication. Here we analyze mdf-1 such-4; dog-1, which we propagated for 470 generations, with freezing of samples for long time storage at F170 and F270. Phenotypic analysis of this strain revealed additional suppression of sterility in the absence of MDF-1, beyond the effects of such-4. We applied oligonucleotide array Comparative Genomic Hybridization (oaCGH) and whole genome sequencing (WGS) and identified a further amplification of cyb-3 (triplication) and a new missense mutation in dynein heavy chain (dhc-1). We show that dhc-1(dot168) suppresses the mdf-1(gk2), and is the second cloned suppressor, next to cyb-3 duplication, that does not cause a delay in anaphase onset. We also show that amplification of cyb-3 and dhc-1(dot168) cooperate to increase fitness in the absence of MDF-1.
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How this classification was reachedexpand
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 | 0.000 |
| 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".