Bibliographic record
Abstract
PURPOSE OF REVIEW: Megakaryocytes are large, polyploid cells that produce platelets and originate from hematopoietic stem cells (HSCs) in the bone marrow. While in the classical paradigm, megakaryocytes are generated in a stepwise fashion through increasingly committed progenitor stages, studies using in-vivo barcoding, transplantation, and in-vitro culture have suggested that, in addition, a more direct pathway existed. The relevance of this direct pathway and its functional and phenotypic characteristics were unclear, however. RECENT FINDINGS: Recent publications using fate-mapping and single-cell transplantation now unequivocally demonstrate the existence of a direct megakaryocyte differentiation pathway, provide molecular characterization, and indicate distinct roles and regulation of both pathways. The direct pathway originates from a separate subset of 'top' HSCs, is enhanced by hematopoietic stress, inflammation and aging, bypasses multipotential progenitors, may be more active in myeloproliferative neoplasms, and generates phenotypically distinct megakaryocyte progenitors and more reactive platelets. SUMMARY: Novel insights into the direct megakaryocyte differentiation pathway provide a deeper understanding of HSC biology, hematological recovery after myeloablation, and aging of the hematopoietic system, and suggest that this pathway may contribute to the increase in thrombotic incidents with age and in myeloproliferative neoplasms.
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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) | 0.003 | 0.000 |
| Bibliometrics | 0.001 | 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".