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Related Experiment Videos

Tcf/Lef transcription factors during T-cell development: unique and overlapping functions.

F J Staal1, H Clevers

  • 1Department of Immunology, Utrecht Medical Center, Utrecht, The Netherlands. f.staal@lab.azu.nl

The Hematology Journal : the Official Journal of the European Haematology Association
|March 29, 2002
PubMed
Summary

T-cell factor-1 (Tcf-1) and lymphoid enhancing factor-1 (Lef-1) are crucial for T-cell development. Lef-1 can compensate for Tcf-1 loss, but Tcf-1 is essential for normal T-cell generation.

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Area of Science:

  • Developmental biology
  • Immunology
  • Molecular genetics

Background:

  • T-cell factor-1 (Tcf-1) and lymphoid enhancing factor-1 (Lef-1) are key members of the TCF/LEF family.
  • Differential expression patterns of Tcf-1 and Lef-1 exist in adult mammals and during murine development.
  • TCF/LEF factors interact with beta-catenin in Wnt signaling pathways across species.

Purpose of the Study:

  • To investigate the in vivo functions of Tcf-1 and Lef-1 using gene disruption experiments.
  • To elucidate the roles of Tcf-1 and Lef-1 in T-cell differentiation and development.
  • To understand the compensatory mechanisms between Tcf-1 and Lef-1 in T-cell generation.

Main Methods:

  • Gene disruption experiments in mice (Tcf-1-/- and Lef-1-/- knockout models).

Related Experiment Videos

  • Analysis of T-cell development in single and double knockout mice (Tcf-1/Lef-1).
  • Comparative analysis of Tcf-1 and Lef-1 expression patterns during murine development.

    • Main Results:

    • Tcf-1 knockout mice showed impaired T-cell generation but were otherwise normal.
    • Lef-1 knockout mice exhibited developmental defects (hair, teeth, mammary glands) and perinatal lethality.
    • Double knockout mice completely lacked T-cell development, demonstrating Lef-1's ability to substitute for Tcf-1 in T-cell differentiation.

    Conclusions:

    • Tcf-1 plays a critical, non-redundant role in T-cell generation.
    • Lef-1 can functionally substitute for Tcf-1 in T-cell differentiation.
    • The TCF/LEF family, through interaction with beta-catenin, is fundamental for developmental processes and cell fate determination.