Hyper-IgM syndrome type 5

The fifth type of hyper-IgM syndrome has been characterized in three patients from France and Japan. The symptoms are similar to hyper IgM syndrome type 2, but the AICDA gene is intact. These three patients instead had mutations in the catalytic domain of uracil-DNA glycosylase, an enzyme that removes uracil from DNA. In both type 2 and type 5 hyper-IgM syndromes, the patients are profoundly deficient in IgG and IgA because the B cells can't carry out the recombination steps necessary to class-switch.

External links

Online Mendelian Inheritance in Man (OMIM) 608106

Immune disorders: Lymphoid and complement immunodeficiency (D80–D85, 279.0–4)

Primary

Antibody/humoral (B)

Hypogammaglobulinemia	X-linked agammaglobulinemia Transient hypogammaglobulinemia of infancy

Dysgammaglobulinemia	IgA deficiency IgG deficiency IgM deficiency Hyper IgM syndrome (1 2 3 4 5) Wiskott-Aldrich syndrome Hyper-IgE syndrome

Other	Common variable immunodeficiency ICF syndrome

T cell deficiency (T)

thymic hypoplasia: hypoparathyroid (Di George's syndrome)
euparathyroid (Nezelof syndrome
Ataxia telangiectasia)

peripheral: Purine nucleoside phosphorylase deficiency

Hyper IgM syndrome (1)

Severe combined (B+T)

x-linked: X-SCID
autosomal: Adenosine deaminase deficiency
Omenn syndrome
ZAP70 deficiency
Bare lymphocyte syndrome

Acquired

AIDS

Leukopenia:
Lymphocytopenia

Idiopathic CD4+ lymphocytopenia

Complement deficiency

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