Polyadenylation Complex CFII Recognizes Downstream Cis‐element for Pre‐mRNA Polyadenylation Through Interaction with an RNA‐Binding Protein in Arabidopsis
Bibliographic record
Abstract
Alternative polyadenylation of pre-mRNA generates mRNAs with alternative 3' ends, thereby increasing the complexity of the transcriptome and proteome. This process is carried out by pre-mRNA 3' end processing complexes, with the specificity and site selection of polyadenylation primarily defined by the interaction between these complexes and conserved pre-mRNA cis-elements. However, the cis-element recognized by the polyadenylation CFII complex and the downstream cis-element of the poly(A) site remain unknown. Here, FPA, a conserved Spen family RNA-binding protein, is identified to physically interacts with the CFII complex in Arabidopsis. FPA specifically binds to a GA-rich cis-element downstream of the proximal poly(A) site, which is required for the CFII complex to promote proximal poly(A) site usage and prevent 3' extension. Thus, the CFII complex recognizes the downstream cis-element of the poly(A) site through its interaction with FPA, highlighting the role of RNA-binding proteins as accessory factors in alternative polyadenylation.
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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 | 0.001 |
| 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) | 0.000 | 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".