Isotypes, Allotypes and Idiotypes. I. ISOTYPES. A. Definition. Isotypes are antigenic determinants that characterize classes and subclasses of heavy chains and. In immunology, an idiotype is a shared characteristic between a group of immunoglobulin or T See also[edit]. Allotype (immunology) · Isotype ( immunology) · Immune network theory. In immunology, an immunoglobulin allotype is the allele of the antibody chains found in the See also[edit]. Allotype · Idiotype · Isotype.

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Isotype, Allotype & Idiotype – What is the Difference?

If you wish to download it, please recommend it to your friends in any social system. Share buttons are a little bit lower. Published by Ezra Little Modified over 3 years ago. Billy Daniels, age 8 months, is brought to the clinic by his parents for testing.

While he is healthy at this moment, for the past 3 months, Billy has had a series of bouts of pneumonia caused by Streptococcus pneumoniae and Haemophilus influenzae type b. He has contracted these infections despite the fact that he has had the recommended vaccinations that have included vaccinations with pneumococcal conjugate vaccine PCV and Haemophilus influenzae type b conjugate vaccine Hib at 2 months, 4 months, and 6 months.

What thoughts do you have about Billy? He has contracted these infections despite being vaccinated. It is likely that he has an impaired immune response. What additional tests might you wish to run? He has normal total WBC and normal differential. So, not likely to be T cell deficiency. Monitor for antibody levels. They are represent classes of antibody. Allotypes have the same constant regions with minor, but immunologic differences.

Different individuals have different allotypes.

Idiotypes are antibodies that recognize idioytpe specific epitopes. Each idiotype is composed of several idiotopes or combining sites. Pentameric IgM is secreted into mucosal secretions.

Secretory IgM has a secretory component that assists in transport across the epithelial membrane. Note that for IgM, the pentameric structure is shown as a flat molecule like a hand flat on a surface.


In reality, the disulfide bonds would all be the same length. In its binding form, the molecule would look more like a hand poised on a surface with only its fingertips touching the surface. This allows for multiple interactions with repeated epitopes on a given antigen.

IgD is a very minor component of serum Ig 0. Although it cannot be transported isotgpe the epithelium, it is produced in the distal pulmonary tract and is important in pulmonary secretions. There are four subclasses of IgG. Can mediate hemolytic disease of the newborn blue baby syndrome, Rh isotypee. Can be used to protect immunocompromised gamma globulin. Can be used as blocking antibody to block TNF production rheumatoid arthritis.

Can be used as blocking antibody to block allergens desensitization to hypersensitivity Not present in most bodily secretions Present in interstitial fluids.

IgA in blood can be monomeric, dimeric, or trimeric. When multimeric, the J chain stabilizes the interactions of the two or three monomers. IgA in bodily secretions is dimeric and combined with the J chain and with secretory component.

The dimeric IgA binds to the Poly-Ig isotyps on the basolateral membrane of an epithelial cell. The dimeric IgA, bound to the Poly-Ig receptor is internalized in an endocytic vesicle. The Poly-Ig receptor is cleaved, with the larger peptide remaining associated with the dimeric IgA as secretory component.

The dimeric IgA, with secretory component, is released on the luminal side of the epithelial cell. Secretory component protects IgA from enzymatic degradation. B cells that will produce IgA migrate to subepithelial tissue of most mucosal epithelia and allorype glandular epithelia.

Present in bodily secretions. Present at very high levels in colostrum and present in breast milk. Provides an excellent level of protection of newborns against respiratory and intestinal infections. IgE plays a major role in combating parasitic infections.

IgE plays a role in combating pulmonary fungal infections. If another epitope of the antigen binds to the paratope of another IgE molecules, this allogype cross-linking. The mast cell degranulates. This causes a high level of expression of IgE with the same paratopes recognize same epitope on antigen on given mast cells.


This makes it easier to cross-link two IgE antibodies. When antigen is present, many mast cells are degranulated, resulting in an over-stimulation of the immune system that is manifested as an allergic reaction Type 1 hypersensitivity. IgE plays an important role in asthma, too. What additional tests would you wish to run? He makes no antibodies. He has an immunodeficiency.

See if he has any B cell function and any T cell function to determine the nature of his immunodeficiency. He appears to have no B cell function.


CD19 test indicates that he has no B cells at all. This type of agammaglobulinemia is caused by a mutation in Bruton tyrosine kinase Btk. Btk is needed for proliferation and differentiation of B cells. Btk mutatiions have variable severity from individual to individual, indicating that different mutations to Btk cause variable expressivity.

Allotype (immunology) – Wikipedia

He is given an intramuscular injection of IgG and will continue receiving these injections every weeks for the rest of his life. In addition, Billy must be promptly given antibiotics any time he has a bacterial infection. Glycoprotein molecules that are produced by plasma cells in response to an immunogen and which function. Immunoglobulins, Cytokines, and Complement system: Immunoglobulins are Gamma globulins proteins of defined specificity for different. Antibody Isotypes, Idiotypes, and Allotypes W.

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