The Carboxy Terminus of YCF1 Contains a Motif Conserved throughout >500 Myr of Streptophyte Evolution
Bibliographic record
Abstract
Plastids evolved from cyanobacteria by endosymbiosis. During the course of evolution, the coding capacity of plastid genomes shrinks due to gene loss or transfer to the nucleus. In the green lineage, however, there were apparent gene gains including that of ycf1. Although its function is still debated, YCF1 has proven to be a useful marker for plastid evolution. YCF1 sequence and predicted structural features unite the plastid genomes of land plants with those of their closest algal relatives, the higher streptophyte algae; YCF1 appears to have undergone pronounced changes during the course of streptophyte algal evolution. Using new data, we show that YCF1 underwent divergent evolution in the common ancestor of higher streptophyte algae and Klebsormidiophycae. This divergence resulted in the origin of an extreme, klebsormidiophycean-specific YCF1 and the higher streptophyte Ste-YCF1. Most importantly, our analysis uncovers a conserved carboxy-terminal sequence stretch within YCF1 that is unique to higher streptophytes and hints at an important, yet unexplored function.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.000 | 0.001 |
| 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) | 0.003 | 0.002 |
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".