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SH2D1A gene
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

SH2D1A gene

The SH2D1A gene provides instructions for creating the SAP protein, which is essential for regulating immune cell function and preventing life-threatening immune reactions.

Normal Function

The SH2D1A gene provides instructions for making a protein called signaling lymphocyte activation molecule (SLAM) associated protein (SAP). SAP interacts with other proteins called SLAM family receptors to activate signaling pathways that are involved in the control of immune cells (lymphocytes). In particular, it helps regulate lymphocytes that destroy other cells (cytotoxic lymphocytes) and is necessary for the development of specialized lymphocytes called natural killer T cells. SAP also helps control immune reactions by triggering self-destruction (apoptosis) of lymphocytes when they are no longer needed.

Health Conditions Related to Genetic Changes

X-linked lymphoproliferative disease

More than 70 SH2D1A gene mutations have been identified in people with X-linked lymphoproliferative disease (XLP). Some SH2D1A gene mutations impair SAP function. Others result in an abnormally short protein that is unstable or nonfunctional, or prevent any SAP from being produced. The loss of functional SAP disrupts proper control of the immune system and may result in the life-threatening immune reaction to Epstein-Barr virus infection that occurs in this disorder. In addition, cancers of immune system cells (lymphomas) may develop in affected individuals when defective lymphocytes are not properly destroyed by apoptosis.

Other Names for This Gene

  • DSHP
  • Duncan disease SH2-protein
  • EBVS
  • MTCP1
  • SAP
  • SH2 domain-containing protein 1A
  • SH21A_HUMAN
  • signaling lymphocyte activation molecule-associated protein
  • SLAM-associated protein
  • XLP
  • XLPD

Frequently Asked Questions

Routine monitoring includes regular EBV serology and viral load testing. If EBV infection is detected, prompt antiviral therapy (e.g., acyclovir) and supportive care are started. If HLH develops, aggressive treatment with steroids, etoposide, and sometimes hematopoietic stem cell transplantation is required. Early referral to a specialist center is advised.
Individuals with pathogenic SH2D1A mutations (X‑linked lymphoproliferative disease) are at high risk for a life‑threatening hemophagocytic lymphohistiocytosis (HLH) when infected with EBV. The risk is essentially 100 % if the mutation is present, so prophylactic measures and early treatment are critical.
llogeneic hematopoietic stem cell transplantation can be curative by replacing the defective immune system. Risks include graft‑versus‑host disease, infection, and transplant‑related mortality. The decision depends on disease severity, donor availability, and patient age; a transplant specialist should evaluate each case.
Because SH2D1A is X‑linked, carrier testing for female relatives and prenatal testing (amniocentesis or chorionic villus sampling) can identify affected fetuses. Pre‑implantation genetic diagnosis (PGD) with IVF is another option. Genetic counselors can guide families through testing, interpretation, and reproductive choices.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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