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  2. Combined immunodeficiency

Combined immunodeficiency

Definition:

The term combined immunodeficiency (CID) is used to distinguish patients with low, but not absent, T-cell function from those with severe CID (SCID) characterized by profound deficiencies of T- and B-cell (and sometimes NK- cell) function. Hyper-IgM syndrome (HIM) represents a group of distinct entities characterized by defective normal or elevated IgM in the presence of diminished IgG and IgA levels. The genetic anomaly in X-linked hyper-IgM syndrome has been mapped to Xq26, and resides in mutations of the CD40 ligand gene. ZAP-70 deficiency is inherited in an autosomal recessive manner. Recurrent and opportunistic infections occur within the first year of life. The mutations in genes responsible for CRAC channel function, ORAI1 and STIM1, cause the defect in Ca2+ influx.

References:

Biomedical Dictionary

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