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In Vivo Functional Study of Disease-associated Rare Human Variants Using Drosophila
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VEXAS syndrome.

Hideaki Nakajima1, Hiroyoshi Kunimoto2

  • 1Department of Stem Cell and Immune Regulation, Yokohama City University Graduate School of Medicine, 3-9 Fuku-Ura, Kanazawa-Ku, Yokohama, 236-0004, Japan. hnakajim@yokohama-cu.ac.jp.

International Journal of Hematology
|May 31, 2024
PubMed
Summary

VEXAS syndrome, a somatic UBA1 mutation disease, causes autoinflammation and is linked to hematologic disorders. Hematopoietic stem cell transplantation offers a cure for VEXAS syndrome.

Keywords:
InflammationMyelodysplastic syndromeUBA1VEXAS syndrome

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Area of Science:

  • Genetics
  • Immunology
  • Hematology

Background:

  • VEXAS syndrome is an adult-onset autoinflammatory disease.
  • It stems from somatic mutations in the UBA1 gene, crucial for ubiquitin activation.
  • These mutations affect hematopoietic stem cells, leading to clonal expansion and myeloid differentiation.

Purpose of the Study:

  • To summarize the key features, pathogenesis, and treatment of VEXAS syndrome.
  • To highlight the diagnostic markers and therapeutic challenges associated with this condition.

Main Methods:

  • Review of existing literature on VEXAS syndrome.
  • Analysis of clinical manifestations, genetic basis, and treatment outcomes.

Main Results:

  • UBA1 mutations, particularly at p.Met41, lead to loss of the UBA1b isoform, impairing ubiquitination and activating innate immunity.
  • Clinical features include recurrent fever, chondritis, vasculitis, and specific hematologic findings like macrocytic anemia and myeloid precursor vacuoles.
  • Associated conditions include myelodysplastic syndrome and venous thromboembolism.

Conclusions:

  • VEXAS syndrome diagnosis relies on identifying UBA1 variants in patients with autoinflammatory symptoms and characteristic hematologic features.
  • Current treatments like anti-inflammatories and JAK inhibitors offer limited efficacy, with hematopoietic stem cell transplantation being the only curative option.