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CTLA4-related primary immune dysregulatory disorders

Safa Baris1,2,3

  • 1Division of Pediatric Allergy and Immunology, Faculty of Medicine, Marmara University.

Current Opinion in Allergy and Clinical Immunology
|October 29, 2025
PubMed

Insights

Lifespan-limiting CTLA4-related immune disorders, including LRBA deficiency and CTLA-4 insufficiency, are better managed with abatacept and sirolimus. Early diagnosis and multidisciplinary care improve outcomes, with HSCT for high-risk cases.

Area of Science:

  • Immunology
  • Genetics
  • Clinical Medicine

Background:

  • CTLA4-related immune disorders are primary immune dysregulation syndromes.
  • These disorders involve susceptibility to infections, autoimmunity, hyperinflammation, and malignancies.
  • LRBA deficiency and CTLA-4 insufficiency are key examples requiring updated clinical guidance.

Purpose of the Study:

  • To review current knowledge on LRBA deficiency and CTLA-4 insufficiency.
  • To guide clinicians in diagnosing and managing these CTLA4-related immune disorders.
  • To highlight emerging molecular mechanisms and therapeutic strategies.

Main Methods:

  • Review of recent studies on LRBA/DEF6-mediated CTLA-4 recycling.
  • Analysis of novel molecular interactions (NBEAL2, Arf1-Rab4) and BEACH-domain protein function.
  • Clinical data review on phenotypic heterogeneity and treatment efficacy.

Main Results:

  • LRBA/DEF6 facilitates CTLA-4 recycling, crucial for immune tolerance.
  • Phenotypic heterogeneity includes infections (CVID, IPEX, ALPS-like), pulmonary/neurological issues, and malignancies.
  • Abatacept and sirolimus show efficacy; HSCT is curative; multiomics may personalize therapy.

Conclusions:

  • Tailored immunomodulation with abatacept and sirolimus enhances disease control and quality of life.
  • Early diagnosis, multidisciplinary care, and timely HSCT are vital for optimal outcomes.
  • Gene therapy and AI-driven pathways offer future personalized treatment possibilities.
Abstract

Keywords:
CTLA-4 insufficiencyLRBA deficiencyabatacepthematopoietic stem cell transplantationimmune dysregulation

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