DNA methylation dynamic in male rat germ cells during gametogenesis
Bibliographic record
Abstract
In mammals, a near complete resetting of DNA methylation (DNAme) is observed during germline establishment. This wave of epigenetic reprogramming is sensitive to the environment, which could impair the establishment of an optimal state of the gamete epigenome, hence proper embryo development. Yet, we lack a comprehensive understanding of DNAme dynamics during spermatogenesis, especially in rats, the model of choice for toxicological studies. Using a combination of cell sorting and DNA methyl-seq capture, we generated a stage-specific mapping of DNAme in nine populations of differentiating germ cells from perinatal life to spermiogenesis. DNAme was found to reach its lowest level at gestational day 18, the last demethylated coding regions being associated with negative regulation of cell movement. The following de novo DNAme displayed three different kinetics with common and distinct genomic enrichments, suggesting a non-random process. DNAme variations were also detected at key steps of chromatin remodeling during spermiogenesis, revealing potential sensitivity. These methylome datasets for coding sequences during normal spermatogenesis in rat provide an essential reference for studying epigenetic-related effects of disease or environmental factors on the male germline.
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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".