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- Antigenic_variation abstract "Antigenic variation refers to the mechanism by which an infectious agent such as a protozoan, bacterium or virus alters its surface proteins in order to evade a host immune response. It is related to phase variation. Immune evasion is particularly important for organisms that target long-lived hosts, repeatedly infect a single host and are easily transmittable. Antigenic variation not only enables immune evasion by the pathogen, but also allows the microbes to cause re-infection, as their antigens are no longer recognized by the host's immune system. When an organism is exposed to a particular antigen (i.e. a protein on the surface of a bacterium) an immune response is stimulated and antibodies are generated to target that specific antigen. The immune system will then \"remember\" that particular antigen, and defenses aimed at that antigen become part of the immune system’s acquired immune response. If the same pathogen tries to re-infect the same host the antibodies will act rapidly to target the pathogen for destruction. However, if the pathogen can alter its surface antigens, it can evade the host's acquired immune system. This will allow the pathogen to re-infect the host while the immune system generates new antibodies to target the newly identified antigen. Antigenic variation can occur by altering a variety of surface molecules including proteins and carbohydrates. There are many molecular mechanisms behind antigenic variation, including gene conversion, site-specific DNA inversions, hypermutation, as well as recombination of sequence cassettes. In all cases, antigenic variation and phase variation result in a heterogenic phenotype of a clonal population. Individual cells either express the phase-variable protein(s) or express one of multiple antigenic forms of the protein. This form of regulation has been identified mainly, but not exclusively, for a wide variety of surface structures in pathogens and is implicated as a virulence strategy.".
- Antigenic_variation wikiPageID "5951626".
- Antigenic_variation wikiPageLength "25528".
- Antigenic_variation wikiPageOutDegree "57".
- Antigenic_variation wikiPageRevisionID "703405492".
- Antigenic_variation wikiPageWikiLink Adaptive_immune_system.
- Antigenic_variation wikiPageWikiLink Antibody.
- Antigenic_variation wikiPageWikiLink Antigen.
- Antigenic_variation wikiPageWikiLink Antigenic_drift.
- Antigenic_variation wikiPageWikiLink Antigenic_shift.
- Antigenic_variation wikiPageWikiLink CD4.
- Antigenic_variation wikiPageWikiLink Carbohydrate.
- Antigenic_variation wikiPageWikiLink Category:Antigens.
- Antigenic_variation wikiPageWikiLink Category:Immune_system.
- Antigenic_variation wikiPageWikiLink Cell_adhesion.
- Antigenic_variation wikiPageWikiLink Complement_system.
- Antigenic_variation wikiPageWikiLink Dengue_virus.
- Antigenic_variation wikiPageWikiLink Endothelium.
- Antigenic_variation wikiPageWikiLink Envelope_glycoprotein_GP120.
- Antigenic_variation wikiPageWikiLink Flaviviridae.
- Antigenic_variation wikiPageWikiLink Fluorescence_in_situ_hybridization.
- Antigenic_variation wikiPageWikiLink Gene_conversion.
- Antigenic_variation wikiPageWikiLink Genetic_recombination.
- Antigenic_variation wikiPageWikiLink Hemagglutinin.
- Antigenic_variation wikiPageWikiLink Host_(biology).
- Antigenic_variation wikiPageWikiLink Human_leukocyte_antigen.
- Antigenic_variation wikiPageWikiLink Immune_system.
- Antigenic_variation wikiPageWikiLink Innate_immune_system.
- Antigenic_variation wikiPageWikiLink Lyme_disease.
- Antigenic_variation wikiPageWikiLink Mycoplasma.
- Antigenic_variation wikiPageWikiLink Neisseria.
- Antigenic_variation wikiPageWikiLink Neisseria_gonorrhoeae.
- Antigenic_variation wikiPageWikiLink Neisseria_meningitidis.
- Antigenic_variation wikiPageWikiLink Neuraminidase.
- Antigenic_variation wikiPageWikiLink Orthomyxoviridae.
- Antigenic_variation wikiPageWikiLink Pathogen.
- Antigenic_variation wikiPageWikiLink Phase_variation.
- Antigenic_variation wikiPageWikiLink Pilin.
- Antigenic_variation wikiPageWikiLink Plasmodium.
- Antigenic_variation wikiPageWikiLink Plasmodium_falciparum_biology.
- Antigenic_variation wikiPageWikiLink Poliovirus.
- Antigenic_variation wikiPageWikiLink Polymer.
- Antigenic_variation wikiPageWikiLink Protein.
- Antigenic_variation wikiPageWikiLink Protozoa.
- Antigenic_variation wikiPageWikiLink Pseudogene.
- Antigenic_variation wikiPageWikiLink Red_blood_cell.
- Antigenic_variation wikiPageWikiLink Rhinovirus.
- Antigenic_variation wikiPageWikiLink Somatic_hypermutation.
- Antigenic_variation wikiPageWikiLink Streptococcus.
- Antigenic_variation wikiPageWikiLink Subtypes_of_HIV.
- Antigenic_variation wikiPageWikiLink Trypanosoma_brucei.
- Antigenic_variation wikiPageWikiLink Variant_surface_glycoprotein.
- Antigenic_variation wikiPageWikiLink West_Nile_virus.
- Antigenic_variation wikiPageWikiLink File:Mechanisms_of_VSG_switching2.png.
- Antigenic_variation wikiPageWikiLink File:Mutation_outside_b12_epitope_affects_binding_of_b12_to_monomeric_gp120.jpg.
- Antigenic_variation wikiPageWikiLinkText "Antigenic variation".
- Antigenic_variation wikiPageWikiLinkText "antigenic diversity".
- Antigenic_variation wikiPageWikiLinkText "antigenic variation".
- Antigenic_variation wikiPageWikiLinkText "antigenically variable".
- Antigenic_variation wikiPageWikiLinkText "antigenically".
- Antigenic_variation wikiPageUsesTemplate Template:Commonscat.
- Antigenic_variation wikiPageUsesTemplate Template:Reflist.
- Antigenic_variation subject Category:Antigens.
- Antigenic_variation subject Category:Immune_system.
- Antigenic_variation comment "Antigenic variation refers to the mechanism by which an infectious agent such as a protozoan, bacterium or virus alters its surface proteins in order to evade a host immune response. It is related to phase variation. Immune evasion is particularly important for organisms that target long-lived hosts, repeatedly infect a single host and are easily transmittable.".
- Antigenic_variation label "Antigenic variation".
- Antigenic_variation sameAs Q4774739.
- Antigenic_variation sameAs m.0fg9wz.
- Antigenic_variation sameAs Q4774739.
- Antigenic_variation wasDerivedFrom Antigenic_variation?oldid=703405492.
- Antigenic_variation isPrimaryTopicOf Antigenic_variation.