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E47 is required for V(D)J recombinase activity in common lymphoid progenitors
Lisa Borghesi1, Jennifer Aites, Shakira Nelson
1Department of Immunology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA. borghesi@pitt.edu
The Journal of Experimental Medicine
|December 21, 2005
Summary
The transcription factor E47 is crucial for regulating common lymphoid progenitor (CLP) development and V(D)J recombinase activity in bone marrow precursors. Its absence halts B cell development, highlighting its role in lineage-specific gene activity.
Area of Science:
- Immunology
- Developmental Biology
- Molecular Genetics
Background:
- Common lymphoid progenitors (CLPs) are critical bone marrow precursors initiating V(D)J recombinase activity for lymphocyte development.
- The precise regulation of V(D)J recombination is essential for generating a diverse repertoire of immune cells.
Purpose of the Study:
- To investigate the role of the transcription factor E47 in CLP development and V(D)J recombinase activity.
- To identify transcription factors essential for lineage-specific V(D)J recombination.
Main Methods:
- Analysis of CLP populations and V(D)J recombination status in E47-deficient mice.
- In vivo assessment of D-J(H) rearrangements in developing B cells.
- Evaluation of recombinase activity in T lineage precursors.
Main Results:
- Loss of E47 significantly reduces CLP numbers and abrogates V(D)J recombinase activity and D-J(H) rearrangements in vivo.
- E47 deficiency causes a developmental arrest before the pro-B cell stage, affecting downstream B cell progeny.
- E47 and its target Erag show minimal impact on recombinase activity in thymic T lineage precursors, indicating lineage specificity.
Conclusions:
- E47 plays a critical role in regulating lineage progression at the CLP stage.
- This study identifies E47 as the first transcription factor required for lineage-specific V(D)J recombinase activity in B cell development.