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Related Experiment Videos

Multilineage gene expression precedes commitment in the hemopoietic system

M Hu1, D Krause, M Greaves

  • 1The Leukaemia Research Fund Centre at the Institute of Cancer Research, Chester Beatty Laboratories, London, UK.

Genes & Development
|March 15, 1997
PubMed
Summary

Hematopoietic stem cells activate multiple gene programs before committing to a single lineage. This promiscuous gene activation allows for early lineage priming in hemopoiesis.

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Area of Science:

  • Hematology
  • Molecular Biology
  • Cell Biology

Background:

  • Hematopoiesis involves stem and progenitor cells differentiating into various blood cell types.
  • Understanding the molecular mechanisms of lineage commitment is crucial for controlling blood cell development.

Purpose of the Study:

  • To investigate whether multipotential hematopoietic stem and progenitor cells activate multiple lineage-specific gene programs before terminal differentiation.
  • To characterize the gene expression profile of multipotential cells during early hematopoiesis.

Main Methods:

  • Single-cell reverse transcription polymerase chain reaction (RT-PCR) was employed to analyze gene expression in individual cells.
  • Specific gene expression programs for erythroid (beta-globin) and myeloid (myeloperoxidase) lineages were targeted.

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  • Expression of lineage-affiliated cytokine receptors was assessed.

    • Main Results:

    • The same cell was shown to initiate both erythroid and myeloid gene expression programs before committing to a single lineage.
    • Multipotential cells coexpressed several distinct lineage-affiliated cytokine receptors.
    • These findings indicate a 'promiscuous' phase of multilineage gene activation preceding commitment.

    Conclusions:

    • Hematopoietic lineage specification is preceded by a phase of promiscuous multilineage gene activation.
    • This early gene priming allows multipotential cells to prepare for differentiation into various blood cell types.
    • The findings support a model where unilineage commitment follows a period of broad gene expression activation.