Inheritance and Genetics of Hyper-IgM Syndrome

Hyper-IgM Syndrome: Genetics Information

Genetics of Hyper-IgM Syndrome: In the most common form of HIM there is a defect in the gene TNFSF5, found on chromosome X at q26. This gene normally produces a CD40 antigen ligand (CD154), a protein on T cells which binds to the CD40 receptor on B and other immune cells. Without CD154, B cells are unable to receive signals from T cells, and thus fail to switch antibody production to IgA and IgG. The absence of CD 40 signals between other immune cells makes individuals with HIM susceptible to infections by opportunistic organisms such as Pneumocystis and Cryptosporidium species. (Source: Genes and Disease by the National Center for Biotechnology)

About inheritance and genetics:

Inheritance of Hyper-IgM Syndrome refers to whether the condition is inherited from your parents or "runs" in families. The level of inheritance of a condition depends on how important genetics are to the disease. Strongly genetic diseases are usually inherited, partially genetic diseases are sometimes inherited, and non-genetic diseases are not inherited. For general information, see Introduction to Genetics.

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