Activin A receptor, type I (ACVR1); A Target Enabling Package
Bibliographic record
Abstract
Germline gain of function mutations in the gene ACVR1 encoding the BMP receptor ALK2 lead to the rare congenital syndrome FOP in which aberrant signalling through the BMP signalling pathway leads to progressive heterotopic ossification in muscle and connective tissue. Identical somatic mutations have been identified in 25% of cases of the childhood brain tumour DIPG. Both conditions affect young children and have no approved therapies. Highly selective ALK2 kinase inhibitors are therefore desirable to achieve chronic treatment of children with safety. We prepared recombinant ALK2 kinase domain and solved structures of ALK2 in complex with new ATP-competitive inhibitors. We identified a novel allosteric pocket in the ALK2 kinase domain and took advantage of these structures to perform crystallographic fragment screening (XChem) using both a standard poised fragment library and a new mini-fragment library. This work identified a poised fragment for development as an allosteric ALK2 inhibitor, as well as mini-fragments exploiting new areas of the ATP and substrate binding pockets. In vitro and cellular assays are available to advance these compounds for drug development in collaboration with patient groups.
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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 | 0.001 | 0.003 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.002 | 0.003 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.063 | 0.044 |
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".