The Karyopherin Sal3 is Required for Nuclear Import of the Core <scp>RNA</scp> Interference Pathway Protein <scp>Rdp</scp>1
Bibliographic record
Abstract
RNA-dependent RNA polymerase activity is required for RNA interference (RNAi) in many lower eukaryotes including the fission yeast Schizosacchromyces pombe. Together with Ago1 and Dcr1, the RNA-dependent RNA polymerase Rdp1 is critical for RNA-dependent transcriptional- and post-transcriptional gene silencing. Although the bulk of Rdp1 is localized to the nucleus, Ago1 and Dcr1 are primarily cytoplasmic. This may reflect the fact that Rdp1 is required early in the RNAi pathway to generate double strand RNA from transcripts that originate from centromeric loci. The relatively large size of Rdp1 (139.4 kD) precludes passive diffusion of the enzyme into the nucleus suggesting that karyopherin-dependent transport is involved in nuclear targeting of this enzyme. In this study, we report that the karyopherin/importin β3 homolog Sal3 is required for nuclear import of Rdp1 in S. pombe. Loss of nuclear Rdp1 was associated with substantially reduced transcriptional gene silencing, and surprisingly, post-transcriptional gene silencing which occurs in the cytoplasm of other eukaryotes, was also significantly affected. Together, these results identify Sal3 as a modulator of RNAi-dependent transcriptional gene silencing as well as a potential link between nuclear import and post-transcriptional gene silencing.
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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 | 0.000 | 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) | 0.001 | 0.001 |
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".