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Cell interactions and gene expression in early hematopoiesis
M Y Gordon1, A M Ford, M F Greaves
1Leukaemia Research Fund Centre, Institute of Cancer Research, London, England.
International Journal of Cell Cloning
|January 1, 1990
Summary
Hematopoietic stem cell gene expression is regulated by microenvironment interactions. Genes primed for transcription in multipotent cells become silenced during lineage commitment.
Area of Science:
- Hematology
- Molecular Biology
- Cell Biology
Background:
- Gene expression regulation is crucial for cell differentiation.
- Hematopoietic stem cells (HSCs) differentiate into various blood cell types.
- The bone marrow microenvironment influences HSC behavior.
Purpose of the Study:
- To investigate gene expression mechanisms during hematopoietic lineage commitment.
- To explore the role of the bone marrow microenvironment in regulating gene expression.
Main Methods:
- Assessed transcriptional status and DNAse I hypersensitivity of lineage-specific genes in hematopoietic cells.
- Studied interactions between early hematopoietic progenitor cells and stromal cells.
- Examined the impact of inducing single lineage commitment on gene accessibility.
Main Results:
- A subset of lineage-restricted genes are transcriptionally active or DNAse I hypersensitive in multipotent hematopoietic cells.
- These genes may become transcriptionally silent and inaccessible upon lineage commitment.
- Stromal cell binding and growth factor exposure influence gene expression.
Conclusions:
- Gene expression in hematopoietic cells is controlled by microenvironmental cues.
- These interactions are vital for normal hematopoietic development.
- Dysregulation of these interactions may contribute to chronic myeloid leukemia.