Details for: CL0000553

Cell ID: CL0000553

Cell Name: megakaryocyte progenitor cell

Description: Lineage negative is described here as CD2-negative, CD3-negative, CD4-negative, CD5-negative, CD8a-negative, CD14-negative, CD19-negative, CD20-negative, CD56-negative, Ly6g-negative, and Ter119-negative.

Synonyms: colony-forming unit-megakaryocyte, megacaryoblast, megacaryocyte progenitor cell, megakaryoblast, promegacaryocyte, promegakaryocyte, CFU-Meg, Meg-CFC, MkP, megakaryocytic progenitor cell

Selected Context(s): Overall

Gene Significance Landscape

Display Options
Score:
Display
Genes

Contexts:

Cell Significance Index (CSI) is uniquely calculated to reveal cell-specific gene markers. More info here

Significant Genes List

Genes with the highest and lowest Percentile Rank Scores (PRS) for megakaryocyte progenitor cell within the selected context(s).

Gene ID: A unique numerical identifier for this specific gene.
Symbol: Shortened abbreviation or name that represents this gene.
Ensembl Gene ID: A unique identifier assigned by Ensembl for genomic data mapping.
CSI Score: A combined effect size and statistical significance measure for megakaryocyte progenitor cell. Higher scores indicate a stronger, more significant difference in expression.
(Previously described as "Fold Change", but now represents Cliff's Delta × –log10(p).)

Gene ID: A unique numerical identifier for this specific gene.
Symbol: Shortened abbreviation or name that represents this gene.
Ensembl Gene ID: A unique identifier assigned by Ensembl for genomic data mapping.
CSI Score: A combined effect size and statistical significance measure for megakaryocyte progenitor cell. Higher scores indicate a stronger, more significant difference in expression.
Average CSI: csi sum / gene count
Cell network configuration

This network visualizes key genes for megakaryocyte progenitor cell. It primarily includes:
1. Top genes highly significant for this cell (Num. Top Cell Genes - based on the 'Min. CSI' setting).
2. Any additional specific 'Context Genes' you add below.
The final network is a combined view. Choose an Interaction Source (pathways or protein interactions) and optionally compare CSI scores with a Baseline Cell Type.

Maximum number of selected genes.
Select a context for the baseline cell.
Select a context for the target cell.
Target Cell for CSI:  megakaryocyte progenitor cell (CL0000553)

 Legend
Nodes (Genes):
 Query Gene
Node size also reflects Target Cell CSI magnitude.
Node Color (Target Cell CSI in specific network):
 Very High
 High
 Medium
 Low
 Very Low
 N/A or Not Sig.
Edges (Interactions):
 STRING (Protein-Protein)
 ONTOLOGY (Shared Pathway)
 Colors vary by pathway category; default arrow applies.

Loading network (please wait)...

## Summary The [megakaryocyte progenitor cell](/details-cell/CL0000553) is a hematopoietic cell committed to the megakaryocytic lineage, ultimately giving rise to platelet-producing megakaryocytes. Based on its gene significance profile, this cell is characterized by an exceptionally high and specific expression of genes involved in RNA processing, splicing, and nuclear organization. Top markers such as [NPM1](/details-gene/4869), [YBX1](/details-gene/4904), and a suite of heterogeneous nuclear ribonucleoproteins (hnRNPs) suggest that the cell's identity is defined less by terminal differentiation factors and more by a powerful post-transcriptional regulatory machinery. This molecular signature is consistent with a progenitor state poised for rapid and complex changes in gene expression required for terminal differentiation and endomitosis. ## Key Characteristics and Function The functional genomics profile of the [megakaryocyte progenitor cell](/details-cell/CL0000553) points towards a state of high metabolic and biosynthetic activity, with a particular emphasis on the regulation of gene expression at the RNA level. * **RNA Processing and Splicing Hub:** A dominant feature of this cell is the high significance of numerous genes integral to mRNA processing and splicing. This includes a remarkable number of hnRNP family members such as [HNRNPA2B1](/details-gene/3181), [HNRNPDL](/details-gene/9987), [HNRNPK](/details-gene/3190), [HNRNPU](/details-gene/3192), [HNRNPC](/details-gene/3183), [HNRNPA1](/details-gene/3178), and [HNRNPA3](/details-gene/220988). Additionally, core splicing factors like [RBM39](/details-gene/9584), [SRSF5](/details-gene/6430), and [SRSF3](/details-gene/6428) are among the top markers. The high specificity scores ([csi_z](/glossary/csi_z)) for this functional cluster strongly suggest that the regulation of alternative splicing is a critical and defining activity, likely orchestrating the complex transitions in the proteome required for megakaryocyte maturation. * **Nuclear Organization and Chromatin Regulation:** The identity of this progenitor is also marked by proteins that structure the nucleus and modulate chromatin. The top marker, [NPM1](/details-gene/4869), along with [NCL](/details-gene/4691), are key nucleolar proteins involved in ribosome biogenesis and chromatin remodeling ([Link](https://pubmed.ncbi.nlm.nih.gov/2478125/)). The high significance of [HMGB1](/details-gene/3146), a non-histone chromatin protein that influences DNA architecture, and [SET](/details-gene/6418), a component of chromatin-modifying complexes ([Link](https://doi.org/10.1128/mcb.12.8.3346-3355.1992)), further underscores that the cell maintains a specific nuclear environment primed for large-scale transcriptional changes. * **Control of Transcription and Translation:** The profile is enriched for master regulators of gene expression. [YBX1](/details-gene/4904) is a DNA/RNA-binding protein that can act as both a transcriptional and translational regulator ([Link](https://doi.org/10.1073/pnas.85.19.7322)). The high significance of [PABPC1](/details-gene/26986), the cytoplasmic poly(A)-binding protein, points to robust control over mRNA stability and translational efficiency. This indicates that the cell tightly couples transcriptional output with protein production, a necessary feature for a rapidly differentiating progenitor. * **Anti-Markers:** The provided list of genes with low significance scores does not contain strong lineage-defining markers, but it is notable that [NFE2](/details-gene/4778), a crucial transcription factor for late-stage megakaryopoiesis, has a very low specificity score (CSI: 0.20). This is consistent with the cell's progenitor status, suggesting that while such factors may be expressed, their expression level is not a uniquely defining characteristic of this early stage compared to other hematopoietic cells. ## Clinical Significance and Contextual Roles **Overall**, the gene signature of the [megakaryocyte progenitor cell](/details-cell/CL0000553) highlights fundamental cellular processes that, when dysregulated, are frequently implicated in hematopoietic malignancies. The top marker, [NPM1](/details-gene/4869), is one of the most frequently mutated genes in acute myeloid leukemia (AML), where its cytoplasmic dislocation alters its normal function in ribosome biogenesis and genome stability. The high specificity of [NPM1](/details-gene/4869) in this progenitor context suggests that this cell type, or a closely related one, could be a cell of origin for NPM1-mutated leukemias. Similarly, [SET](/details-gene/6418) is part of a fusion oncogene, SET-NUP214, found in acute undifferentiated leukemia and T-cell acute lymphoblastic leukemia. The profound enrichment for splicing factors ([HNRNPs](/glossary/hnRNP), [SRSFs](/glossary/SRSF)) is also clinically relevant, as mutations in and mis-splicing of RNA processing genes are increasingly recognized as drivers of myelodysplastic syndromes (MDS) and leukemias. The molecular identity of the [megakaryocyte progenitor cell](/details-cell/CL0000553) appears to be intrinsically tied to this machinery, making it a potentially vulnerable point for malignant transformation. Therefore, this cell type may serve as a critical model for understanding how disruption of fundamental RNA biology and chromatin regulation contributes to the development of blood cancers. ## Potential Mechanisms and Research Directions 1. **Hypothesis: The identity of megakaryocyte progenitors is established and maintained by a specific post-transcriptional regulatory code, orchestrated by a unique combination of RNA-binding proteins and splicing factors.** * **Surprising Findings:** The most specific markers for this cell are not the canonical lineage-defining transcription factors (e.g., GATA1, FLI1, RUNX1), but rather the seemingly "housekeeping" machinery of RNA processing. This suggests that the regulation of mRNA splicing, stability, and translation is a more defining feature of this progenitor state than the mere presence of master transcriptional regulators. * **Testable Questions:** Can single-cell RNA sequencing combined with analysis of splice variants reveal a unique "splicing signature" for [megakaryocyte progenitor cells](/details-cell/CL0000553)? How does the targeted depletion of highly specific hnRNPs like [HNRNPA2B1](/details-gene/3181) or splicing factors like [SRSF5](/details-gene/6430) affect megakaryocyte differentiation efficiency and platelet production in vitro? 2. **Hypothesis: The high and specific expression of nucleolar and chromatin-associated proteins like [NPM1](/details-gene/4869) and [HMGB1](/details-gene/3146) creates a distinct nuclear architecture that poises key megakaryopoiesis-related genes for rapid activation during differentiation.** * **Surprising Findings:** A protein like [NPM1](/details-gene/4869), central to ribosome biogenesis, functions as the top specificity marker ([csi_z](/glossary/csi_z)). This elevates its role beyond general cell growth, implying a uniquely regulated function or expression level in these progenitors that is critical for their identity and fate, potentially linking ribosome production directly to lineage commitment. * **Testable Questions:** Does the [megakaryocyte progenitor cell](/details-cell/CL0000553) exhibit a unique 3D chromatin conformation, as measured by Hi-C, that is dependent on [NPM1](/details-gene/4869) levels? Does perturbation of [NPM1](/details-gene/4869) or [HMGB1](/details-gene/3146) alter the chromatin accessibility (via ATAC-seq) at the promoters and enhancers of critical megakaryocyte transcription factors?