Trypanosomatid histones: the building blocks of the epigenetic code of highly divergent eukaryotes
Bibliographic record
Abstract
Histones play a fundamental role in eukaryotic organisms not only as scaffolding proteins in DNA packaging but also in regulating gene expression. They constitute the protein reel around which DNA wraps forming nucleosomes. This initial packing gives rise to the chromatin fiber which is next folded into three-dimensional arrangements. Additionally, histones have expanded their functions through the emergence of histone variants which have specialized purposes and can deeply affect chromatin organization and dynamics. Moreover, both canonical histones and histone variants comprise the building blocks of the histone code by being targets of different post-translational modifications (PTMs) that occur in a highly regulated manner both in place and time. Most of the above-mentioned about chromatin organization is conserved among eukaryotes. However, trypanosomatid histones have many peculiarities that entail a special description. In this review, we compile the current knowledge of canonical core histones, histone variants, and their PTMs in trypanosomatids. We highlight the similarities and differences between histone variants and their canonical counterparts in trypanosomatids, and we compare them with those from model organisms. Finally, we discuss the crosstalk between different histone marks and their genomic distribution underlying the uniqueness of trypanosomatids.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 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 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".