What is meant by allotype?
Definition of allotype : an alloantigen that is part of a plasma protein (such as an antibody)
What is isotype allotype and idiotype?
A single clone of plasma cells produces immunoglobulin molecules with identical variable-region sequences i.e., they all have the same idiotype. When antibodies having no or minimal variation in their isotypes and allotypes are injected into a genetically identical person, anti-idiotype antibodies will be formed.
What is isotype allotype?
Isotype and allotype are terms that relate to the structure of a component of the immune system that is called an immunoglobulin. Immunoglobulins bind their corresponding antigen . Immunoglobulins of the same isotype have the same amino acid structure in two specific regions of the heavy chain.
What is anti Isotypic antibody?
The determinants that are recognized by such antibodies are called isotypic determinants and the antibodies to those determinants are called anti-isotypic antibodies. Each class, subclass, type and subtype of immunoglobulin has its unique set of isotypic determinants.
What is allotype in taxonomy?
Noun. allotype (plural allotypes) (zoology, taxonomy) A designated paratype of a species (or lower-order taxon) that is the opposite sex of the holotype. quotations ▼ (biochemistry) A genetically determined variant of the amino acid sequence of a protein.
What do you mean by allotype in immunology?
In immunology, allotype is an immunoglobulin variation (in addition to isotypic variation) that can be found among antibody classes and is manifested by heterogeneity of immunoglobulins present in a single vertebrate species.
What do you mean by Allotype in immunology?
What does isotype mean in immunology?
īsə-tīp. A biological specimen or other element that is a duplicate of the holotype. noun. Any of the subclasses of immunoglobulins defined by the chemical and antigenic characteristics of their constant regions.
Where are idiotypic determinants located?
Idiotypic determinant, an epitope located on the variable region of the heavy or light chain of an immunoglobulin molecule, could be classified into private and public forms. The private idiotype is a marker unique to a single clone of B cell and hence a fingerprint of an individual clone.
Does IgG2 fix complement?
For instance, IgG2 does not cross the placenta, IgG4 does not fix complement and IgG2 and IgG4 do not bind to Fc receptors with a high affinity (Meulenbroek and Zeijlemaker, 1996).
What is the difference between IgG1 and IgG4?
Typically, IgG1 and IgG3 are potent triggers of effector mechanisms, whereas IgG2 and IgG4 will induce more subtle responses, and only in certain cases. However, these antibodies remain capable of neutralizing virus particles and toxins.
What makes up the structure of an allotype antibody?
Before we understand the meaning of an allotype antibody, let us first review the general structure of an antibody. Antibodies are proteins made up of four chains – two light chains and two heavy chains. These proteins are essential members of our immune system and they are also known as immunoglobulins (Ig).
Where does the word allotype come from in immunology?
The word allotype comes from two Greek roots, allo meaning ‘other or differing from the norm’ and typos meaning ‘mark’. Thus allotype refers to the idea that each immunoglobulin has unique sequences particular to the individual’s genome that manifest in its constant region (normally).
How many allotypes are in the IgA class of antibodies?
Humans have about 25 different IgG allotypes and the IgA class of antibody has two allotypes. Allotype of an antibody plays a crucial role during medical interventions that use therapeutic antibodies.
Can a non-self allotype cause an anti-allotype response?
Exposure of individuals to a non-self allotype might elicit an anti- allotype response and became cause of problems for example in a patient after transfusion of blood or in a pregnant woman. However, it is important to mention that not all variations in immunoglobulin amino acid sequence pose as a determinant responsible for immune response.