Severe combined immunodeficiency due to complete RAG1/2 deficiency

Severe combined immunodeficiency due to complete RAG1/2 deficiency (also called T-B- SCID or RAG-deficient SCID) is a very serious inherited immune system disorder. It is caused by mutations in either the RAG1 or RAG2 gene, which are essential for building functional T cells and B cells — the two main types of white blood cells that fight infections. Without working copies of these genes, the body cannot produce T cells or B cells at all, leaving the baby with virtually no immune defense against bacteria, viruses, or fungi. Symptoms typically appear in the first few weeks to months of life. Affected babies develop severe, recurrent, and life-threatening infections including pneumonia, chronic diarrhea, skin infections, and oral thrush that does not go away. They often fail to gain weight and grow normally, a condition called failure to thrive. Without treatment, this condition is fatal, usually within the first one to two years of life. The primary curative treatment is hematopoietic stem cell transplantation (bone marrow transplant), ideally performed as early as possible — before serious infections develop. Gene therapy is also being explored as a potential treatment option. Until a transplant can be performed, babies must be kept in a protected environment and may receive immunoglobulin replacement therapy and preventive antibiotics to reduce infection risk. Newborn screening programs that detect SCID through the TREC assay have dramatically improved early diagnosis and outcomes.

Bring these to your next appointment

• Q1.How soon should my baby have a bone marrow transplant, and what type of donor is best?,Has my baby already developed any infections that could affect transplant outcomes?,What isolation precautions do we need to follow at home before the transplant?,Is gene therapy a possibility for my child, and are there any clinical trials available?,What are the risks and potential complications of the bone marrow transplant?,Will my child need lifelong immunoglobulin replacement therapy after transplant?,Should our other children or future pregnancies be tested for this condition?

Common questions about Severe combined immunodeficiency due to complete RAG1/2 deficiency