Modes and Tempos of Mitochondrial and Chloroplast Genome Evolution in Chlamydomonas: A Comparative Analysis
Bibliographic record
Abstract
Chlamydomonas mitochondrial and chloroplast genomes, in contrast to the land plant counterparts, exhibit concerted modes and tempos of evolution. The 1.5-fold variation currently observed in the size of both organelle genomes is mostly accounted for by changes in the spacer DNA and intron number, with less contribution from changes in gene content and amount of repeated DNA. Gene order is highly variable in both mitochondrial and chloroplast genomes of Chlamydomonas, the level of gene rearrangement being correlated with the abundance of short dispersed repeated sequences throughout the genome. Intron-containing-, fragmented-, and fragmented and scrambled coding regions are common features of mitochondrial and chloroplast gene structure and organization within the group. The level of ribosomal RNA gene sequence divergence in both mitochondrial and chloroplast genomes is higher in the Chlamydomonas lineage than in land plants and is most likely due to higher rates of nucleotide substitution in Chlamydomonas organellar DNAs. The mechanisms as well as the selective pressures that shaped the organellar genomes in the Chlamydomonas lineage remain to be explained.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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 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".