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Updated: May 29, 2026
08:20
In Vitro Differentiation of Human CD4+FOXP3+ Induced Regulatory T Cells (iTregs) from Naïve CD4+ T Cells Using a TGF-β-containing Protocol
Published on: December 30, 2016
The p.Arg63Trp polymorphism controls Vav1 functions and Foxp3 regulatory T cell development
Céline Colacios1, Audrey Casemayou, Anne S Dejean
1INSERM Unité 1043, Centre National de la Recherche Scientifique Unité 5282, Toulouse, France.
The Journal of Experimental Medicine
|September 28, 2011
Summary
A genetic variation in the Vav1 gene influences the number of regulatory T (Treg) cells, crucial for immune tolerance. This finding highlights the role of Vav1 signaling in Treg cell development and immune system regulation.
Area of Science:
- Immunology
- Genetics
- Cell Biology
Background:
- CD4(+) regulatory T cells (Treg) expressing Foxp3 are vital for peripheral tolerance.
- Treg cells suppress pathogenic conventional T cells (Tconv).
Purpose of the Study:
- To identify genetic factors controlling the natural Treg cell compartment size.
- To investigate the functional impact of a specific genetic polymorphism on Treg cell development.
Main Methods:
- Fine mapping of a quantitative trait locus on rat chromosome 9.
- Association studies using single nucleotide polymorphisms (SNPs).
- Analysis of Vav1 gene function and T cell receptor signaling.
Main Results:
- A nonsynonymous SNP (p.Arg63Trp) in the Vav1 gene was identified.
- This polymorphism increases Treg cell numbers in thymus and lymphoid organs.
- The polymorphism leads to Vav1 constitutive activation and altered T cell receptor signaling.
Conclusions:
- Vav1 signaling is critical for natural Treg cell development.
- A specific Vav1 polymorphism impacts Treg cell homeostasis.
- This study reveals a novel mechanism regulating immune tolerance.
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