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Updated: Sep 16, 2025

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Essential cell-intrinsic requirement for GMDS in T cell development.

Mehmet Yabas1,2, Carla M Roots1, T Daniel Andrews1

  • 1Division of Immunology and Infectious Disease, The John Curtin School of Medical Research, The Australian National University, Canberra, ACT, Australia.

Frontiers in Immunology
|July 11, 2025
PubMed
Summary

Mice with a mutation in the guanosine diphosphate (GDP)-mannose 4,6-dehydratase (GMDS) gene showed impaired T cell development. This study reveals GMDS is essential for early T cell development in mice.

Keywords:
GMDST cell developmentT cellsfucosylationglycosylationimmune system

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Area of Science:

  • Immunology
  • Glycobiology
  • Developmental Biology

Background:

  • Fucosylation, a critical post-translational modification, relies on GDP-fucose.
  • GDP-mannose 4,6-dehydratase (GMDS) is essential for GDP-fucose generation.
  • The role of GMDS in T cell development is not well understood.

Purpose of the Study:

  • To investigate the function of GMDS in T cell development.
  • To characterize a novel mouse model with a mutation in the Gmds gene.
  • To determine the cell-intrinsic requirement for GMDS in T cell maturation.

Main Methods:

  • Generated a mouse strain with a point mutation in the Gmds gene using N-ethyl-N-nitrosourea.
  • Performed immunophenotyping of thymocytes and peripheral blood cells.
  • Utilized bone marrow reconstitution and mixed chimera experiments in Rag1-/- mice.

Main Results:

  • Gmds mutant mice exhibited growth retardation and increased mortality.
  • A partial arrest in T cell development at the double-negative (DN) stage was observed in the thymus.
  • Gmds mutant T cells showed impaired competitive ability during thymic development, leading to reduced peripheral T cells.
  • B cell development remained largely unaffected.

Conclusions:

  • GMDS is essential for early T cell development in mice.
  • The Gmds mutation causes a cell-intrinsic defect in T cell maturation.
  • This study highlights the critical role of fucosylation substrate generation in lymphocyte development.