Inherited immune disorders
IL2RG-associated X-linked severe combined immunodeficiency
IL2RG-associated SCID disrupts immune signaling needed for T-cell and natural-killer-cell development. B cells may be present but function poorly. Some IL2RG variants cause less typical, later presentations.
Other names and abbreviations
X-SCID · SCID-X1 · IL2RG deficiency · gamma-c deficiency · SCID · severe combined immunodeficiency · bubble boy disease · X-linked severe combined immunodeficiency · Common gamma-chain deficiency
Where transplant fits
Allogeneic transplantation is an established treatment and may use a suitable sibling, unrelated donor or an alternative family donor. Gene-therapy approaches use the patient’s own cells and are a separate treatment pathway.
Treatment depends on the exact diagnosis, disease stage, prior treatment and the person’s health. These categories are not estimates of donor demand.
Treatment at a glance
- Who it affects
- An X-linked disorder usually recognized in male infants, including through newborn screening or family testing.
- Other treatment options
- Infection prevention, immunoglobulin replacement and treatment of existing infections support the child while immune-restoring treatment is arranged.
- Cells used for transplantation
- When transplantation is appropriate, the graft contains blood-forming stem cells from a suitable donor. Bone marrow, peripheral blood or cord blood may be selected according to the condition and transplant protocol.
Why the details matter
A positive screening result requires urgent specialist assessment; it is not itself a complete molecular diagnosis. Donor choice and conditioning depend on genotype and clinical status.
Questions to bring to your care team
What is the exact diagnosis or subtype? What is the goal of each treatment option? If transplant is being considered, why does it fit this situation, which cells would be used and what are the alternatives?
Sources and further reading
- X-Linked Severe Combined Immunodeficiency
GeneReviews, University of Washington / NCBI Bookshelf · Accessed 2026-09-05 - Guidelines for hematopoietic stem cell transplantation for inborn errors of immunity
EBMT / ESID Inborn Errors Working Party · 2021
Understanding can become action.
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