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An early T cell lineage commitment checkpoint dependent on the transcription factor Bcl11b
Long Li1, Mark Leid, Ellen V Rothenberg
1Division of Biology 156-29, California Institute of Technology, Pasadena, CA 91125, USA.
The zinc finger transcription factor Bcl11b is crucial for T lymphocyte lineage commitment. This transcription factor is essential for suppressing natural killer cell potential and silencing stem cell genes during T cell development.
Area of Science:
- Hematopoiesis
- Immunology
- Molecular Biology
Background:
- The regulators of hematopoietic precursor commitment to the T lymphocyte lineage remain largely unknown.
- T lineage commitment involves suppressing alternative cell fates (natural killer, myeloid, dendritic) and stem cell self-renewal functions.
Purpose of the Study:
- To identify the regulators involved in T lymphocyte lineage commitment.
- To elucidate the role of Bcl11b in the critical stages of T cell development.
Main Methods:
- Investigated the expression pattern of Bcl11b in hematopoietic cells.
- Utilized mouse models to assess the necessity of Bcl11b for T lineage commitment.
- Analyzed gene expression changes related to natural killer and stem cell functions upon Bcl11b manipulation.
Main Results:
- Bcl11b is a T cell-specific transcription factor expressed just before lineage commitment.
- Bcl11b is indispensable for T lineage commitment in mice.
- Bcl11b actively represses natural killer cell-associated genes.
- Bcl11b down-regulates stem cell and progenitor cell regulatory genes during commitment.
Conclusions:
- Bcl11b is a key regulator that mediates T lymphocyte lineage commitment.
- Bcl11b functions by suppressing alternative cell potentials and silencing progenitor cell characteristics at the commitment stage.
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