Sparrows and supergenes: Ecological epigenetics in action
Bibliographic record
Abstract
Despite the promise of ecological epigenetics, there remain few cases that clearly link epigenetic variation in wild animal populations to evolutionary change. In this issue of Molecular Ecology, Sun et al. provide such an example in white-throated sparrows-a fascinating system in which a large chromosomal rearrangement generates a "supergene" polymorphism linked to plumage colour, aggression and parenting behaviour. By combining whole genome bisulphite sequencing with RNA-sequencing and chromatin accessibility data, they show that the two alleles of this chromosomal polymorphism also exhibit substantial differences in DNA methylation levels, with implications for gene expression and transposable element activity. Their results provide a compelling case study for how genetic and epigenetic evolution proceed in concert. They also demonstrate the importance of integrating multiple types of genomic information to understand how gene regulation evolves, providing a model for future work in nonmodel species.
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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 | 0.002 | 0.006 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.002 | 0.003 |
| Scholarly communication | 0.002 | 0.003 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.024 | 0.022 |
| Insufficient payload (model declined to judge) | 0.004 | 0.004 |
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".