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Immunoglobulin E (IgE) is a type of antibody (or immunoglobulin (Ig) "isoform") that has been found only in mammals. IgE is synthesised by plasma cells. Monomers of IgE consist of two heavy chains (ε chain) and two light chains, with the ε chain containing four Ig-like constant domains (Cε1–Cε4). [1]
IGHE (immunoglobulin heavy constant epsilon): The gene that encodes the ε heavy chain constant region for the IgE antibody. This gene is critical for the production and function of IgE in the body. The IGHE gene provides instructions for making a part of an antibody (immunoglobulin) called Immunoglobulin E, or IgE. [5]
The high-affinity IgE receptor, also known as FcεRI, or Fc epsilon RI, is the high-affinity receptor for the Fc region of immunoglobulin E (IgE), an antibody isotype involved in allergy disorders and parasite immunity. FcεRI is a tetrameric receptor complex that binds Fc portion of the ε heavy chain of IgE. [1]
An IgE level greater than 2,000 IU/mL is often considered diagnostic. [17] However, patients younger than 6 months of age may have very low to non-detectable IgE levels. Eosinophilia is also a common finding with greater than 90% of patients having eosinophil elevations greater than two standard deviations above the normal mean. [18]
The Fc region of immunoglobulin E (IgE) becomes bound to mast cells and basophils, and when IgE's paratopes bind to an antigen, it causes the cells to release histamine and other inflammatory mediators. [6] These similarities have led many to speculate that mast cells are basophils that have "homed in" on tissues.
In technical terms, an allergen is an antigen that is capable of stimulating a type-I hypersensitivity reaction in atopic individuals through immunoglobulin E (IgE) responses. [1] Most humans mount significant Immunoglobulin E responses only as a defense against parasitic infections. However, some individuals may respond to many common ...
Immunoglobulin E is a class of antibody (or immunoglobulin "isotype") that has only been found in mammals. It plays an important role in allergy, and is especially associated with type 1 hypersensitivity. There are receptors (FcεR) for the constant region of IgE, the Fc region, on several types of cells, including Mast cells and Basophils ...
Immunoglobulin A (IgA) 5-39 × 10 −4: Immunoglobulin D (IgD) 0.5-8.0 × 10 −5: Immunoglobulin G (IgG) 5.0-19 × 10 −3: Immunoglobulin M (IgM) 3.0-30 × 10 −4: Immunoglobulin E (IgE) <5 × 10 −7: Indican: 8-50 × 10 −7: Inositol: 3-7 × 10 −6: Insulin: 2.0-8.4 × 10 −10: Insulin-like growth factor: 9.9-50 × 10 −8: Iodine ...
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