X-linked SCID typically affects males, who only have one X chromosome. Instead of mobilizing lymphocytes to mature, replicate and spread to fight infection when it is detected, a mutated IL2RG gene will do nothing - leaving the body defenseless to infection. The mutation causes the gene to fail to respond to fight infection. X-linked SCID is caused by mutations in the IL2RG gene on the X chromosome. Adenosine deaminase (ADA) deficiency SCID (13 percent of all SCID patients).Recombinase activating genes 1 and 2 (RAG1/RAG2) SCID (20 percent of all SCID patients).X-linked SCID (IL2RG SCID, common gamma chain SCID) (31 percent of all SCID patients).There are several types of SCID, but some of the most common are: In SCID, the immune-protecting skills of both T cells and B cells are affected. NK cells, like their name implies, are typically involved in the direct killing of diseased cells. B cells produce antibodies that attack foreign substances such as viruses and bacteria. In addition, some T cells are also able to directly detect and destroy infected or diseased cells. T cells are the helper cells in the blood stream that encourage other cells in the body to respond to foreign substances and combat infections. These defects affect lymphocytes, a type of white blood cells, that become T cells, B cells and natural killer (NK) cells. Severe combined immunodeficiency is a group of hereditary disorders linked to defects of at least 17 different genes. Today, thanks to newborn screening in many states, early intervention, and advances in treatment, children with severe combined immunodeficiency can be successfully treated with bone marrow transplant and in some cases gene therapy. Many died in early childhood after repeated infections. Until a few years ago, the majority of children with severe combined immunodeficiency were not diagnosed until they were at least 6 months old and very sick. At the time, doctors believed the only way to treat children born with this rare disorder was to isolate them until they could receive a bone marrow transplant from related donor with a 100 percent human leucocyte antigen match. Treatment for SCID should be considered a pediatric emergency.Ĭommonly called the “bubble boy disease” or “boy in the bubble” syndrome, SCID became widely known in the 1970s and ’80s due to the publicity and later a movie about David Vetter, a boy with X-linked SCID, who lived in a plastic, germ-free bubble for 12 years. As a result, the child’s body is unable to fight off infections and can become very sick from infections like chickenpox, pneumonia and meningitis and can die within the first year of life. Severe combined immunodeficiency (SCID) is a group of rare, life-threatening diseases that cause a child to be born with very little or no immune system.
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