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Modeling TCIRG1 Neutropenia by Utilizing Patient Derived Induced Pluripotent Stem Cells.

Vahagn Makaryan1, Merideth L Kelley1, Audrey Anna Bolyard1

  • 1Department of Medicine, University of Washington, Seattle, Washington, U.S.A.

Journal of Cellular Immunology
|September 18, 2025
PubMed
Summary

Mutations in the TCIRG1 gene impair neutrophil development, leading to congenital neutropenia. Correcting TCIRG1 mutations in stem cells restored normal neutrophil production, revealing the gene's critical role in immune cell formation.

Keywords:
CRISPR/Cas9GranulopoiesisNeutropeniaNeutrophilsTCIRG1V-ATPaseiPSCs

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Area of Science:

  • Genetics and Molecular Biology
  • Immunology
  • Hematology

Background:

  • Congenital neutropenia is a condition of low neutrophil counts, increasing infection risk.
  • TCIRG1 mutations are increasingly linked to congenital neutropenia, but their mechanism is unknown.
  • TCIRG1 is a vacuolar ATPase (V-ATPase) component crucial for osteoclasts, with an unclear role in hematopoiesis.

Purpose of the Study:

  • To investigate the functional consequences of TCIRG1 mutations on hematopoiesis and neutrophil development.
  • To elucidate the molecular mechanisms underlying TCIRG1-associated congenital neutropenia.

Main Methods:

  • Generated induced pluripotent stem cells (iPSCs) from patients with TCIRG1 mutations and healthy controls.
  • Utilized in vitro differentiation protocols to assess hematopoietic progenitor cells and neutrophil differentiation.
  • Employed CRISPR/Cas9 gene editing to correct TCIRG1 mutations and immunofluorescence to analyze protein expression and localization.

Main Results:

  • Patient-derived iPSCs exhibited impaired myeloid differentiation and increased cell death.
  • CRISPR/Cas9 correction of the TCIRG1 R736C mutation restored normal neutrophil differentiation.
  • Mutant TCIRG1 protein showed reduced expression and altered intracellular localization, with diffuse cytosolic distribution.

Conclusions:

  • TCIRG1 mutations impair neutrophil development, likely by disrupting the V-ATPase complex structure and function.
  • This study clarifies the molecular basis of TCIRG1-associated neutropenia.
  • Findings suggest potential therapeutic targets for congenital neutropenia.