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Related Experiment Video

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Intact B-Cell Signaling and Function With Host B-Cells 47 Years After Transplantation for X-SCID.

Christin Deal1, Timothy J Thauland1, E Richard Stiehm1

  • 1Division of Immunology, Allergy, and Rheumatology, Department of Pediatrics, University of California, Los Angeles, Los Angeles, CA, United States.

Frontiers in Immunology
|April 9, 2020
PubMed
Summary
This summary is machine-generated.

Hematopoietic stem cell transplantation for Severe Combined Immunodeficiency (SCID) can lead to long-term survival. A patient with a unique gamma chain (γc) variant achieved 48-year survival with intact IL-21 signaling and donor T cells.

Keywords:
B cellIL-21IL2RGIVIGSCIDchimerismgamma chaintransplant

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Area of Science:

  • Immunology
  • Genetics
  • Hematology

Background:

  • Severe Combined Immunodeficiency (SCID) is a life-threatening genetic disorder impacting T-cell function.
  • Hematopoietic stem cell transplantation (HSCT) is the standard SCID treatment, necessitating long-term outcome assessment.
  • Understanding genetic variants and their impact on immune reconstitution is crucial for SCID management.

Observation:

  • A SCID patient with an IL2RG gene variant (NM_000206.2:c.675C>A, p.Ser225Arg) exhibited intact IL-21 signaling despite carrying the pathogenic variant.
  • The patient received an unconditioned, matched, related donor HSCT in 1971 and has survived for 48 years.
  • Chimerism studies revealed donor T cells, host B cells, and host myeloid cells, with mixed NK cells.

Findings:

  • The patient demonstrated T-dependent vaccine responses and survived over four decades without immunoglobulin replacement.
  • Host B cells, despite carrying the IL2RG variant, showed intact gamma chain (γc)-dependent IL-21 signaling.
  • Donor T-cell reconstitution, coupled with intact B-cell function, facilitated long-term survival.

Implications:

  • This case highlights that functional B-cell recovery, driven by intact IL-21 signaling and T-cell help, can ensure long-term survival in SCID.
  • Hypomorphic γc variants and precise HLA matching are critical factors for successful HSCT outcomes in SCID.
  • The findings suggest potential therapeutic strategies for SCID patients with specific genetic profiles and varying chimerism.