Novel mitosis-specific phosphorylation of histone H3 at Thr11 mediated by Dlk/ZIP kinase
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Bibliographic record
Abstract
Death-associated protein (DAP)-like kinase (Dlk), also known as Zipper interacting protein (ZIP) kinase, is a nuclear serine/threonine-specific kinase that phosphorylates core histones H3 and H4, and myosine light chain in vitro. It interacts with transcription and splicing factors as well as with pro-apoptotic protein Par-4 suggesting that it participates in multiple cellular processes. To explore the significance of histone phosphorylation by Dlk, we determined the phosphorylation site in H3 and generated phosphospecific antibodies for in vivo analyses. Interestingly, Dlk/ZIP kinase phosphorylated histone H3 at a novel site, Thr11, rather than Ser10, which is characteristic of mitotic chromosomes. Immunoblotting and confocal immunofluorescence analyses demonstrated that phosphorylation of H3 at Thr11 occurred in vivo and was restricted to mitosis as well. It was discernable from prophase to early anaphase and particularly enriched at centromeres. Strikingly, during this time interval, Dlk was associated with centromeres too, as revealed by stable expression of a green fluorescent protein (GFP)-Dlk fusion protein. These findings strongly suggest that Dlk is a centromere-specific histone kinase that might play a role in labeling centromere-specific chromatin for subsequent mitotic processes.
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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 | 0.001 | 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 it