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Diversity of Antigen Receptors01:28

Diversity of Antigen Receptors

Antigen receptors are essential components of the immune system crucial in defending the body against foreign invaders. These receptors are present on the surface of B and T cells, enabling them to recognize antigens and mount an appropriate immune response.
Before encountering any antigen, lymphocytes express these receptors. On B cells, the antigen receptor is a membrane-bound antibody molecule called BCR; on T cells, it is a T cell receptor or TCR. B and T cell receptors are composed of two...
Diversity of Protists IV01:27

Diversity of Protists IV

Amoebozoa represent a diverse group of terrestrial and aquatic protists that utilize lobe-shaped pseudopodia for locomotion and feeding. This characteristic differentiates them from the Rhizaria, which possess threadlike pseudopodia. The primary classifications within Amoebozoa include gymnamoebas, entamoebas, and the plasmodial and cellular slime molds. Phylogenetic evidence indicates that Amoebozoa diverged from a lineage that ultimately gave rise to fungi and animals.Gymnamoebas and...
Diversity of Protists I01:15

Diversity of Protists I

Excavata is a diverse group of protists that includes both chemoorganotrophic and phototrophic species, with some thriving in anaerobic environments. Among the key groups within Excavata are diplomonads and parabasalids, which are flagellated protists that lack mitochondria and chloroplasts. These microorganisms typically inhabit anoxic environments, such as the intestines of animals, where they exist either symbiotically or as parasites, relying on fermentation for energy production. Some...
Diversity of Protists II01:27

Diversity of Protists II

Alveolates are a group of organisms recognized by the presence of alveoli, which are cytoplasmic sacs located beneath the cell membrane. While their function remains uncertain, alveoli may help regulate water balance by controlling how much water enters and leaves the cell. In dinoflagellates, these structures may serve as armor plates. There are three major types of alveolates: ciliates, which move using cilia; dinoflagellates, which use flagella for movement; and apicomplexans, which are...
Diversity of Protists III01:27

Diversity of Protists III

Rhizaria are a diverse group of unicellular protists characterized by their threadlike cytoplasmic extensions known as pseudopodia. These structures aid in both locomotion and feeding, giving Rhizaria an amoeboid appearance. Their amoeboid morphology once led to taxonomic confusion, but molecular phylogenetics has clarified their evolutionary placement and emphasized their shared use of pseudopodia despite divergent lineages.This clade comprises diverse lineages such as Chlorarachniophyta,...
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Invertebrate immune diversity.

Julie Ghosh1, Cheng Man Lun, Audrey J Majeske

  • 1Department of Biological Sciences, George Washington University, Washington, DC, United States.

Developmental and Comparative Immunology
|December 25, 2010
PubMed
Summary
This summary is machine-generated.

Invertebrate immune systems utilize diverse molecular strategies to combat pathogens, driven by evolutionary pressures. Common genetic building blocks and diversity-generating mechanisms are found across various species, suggesting an ancient, fragmented immune toolkit.

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Area of Science:

  • Evolutionary immunology
  • Invertebrate defense mechanisms
  • Molecular diversification of immune genes

Background:

  • Host-pathogen interactions drive the evolution of immune gene diversity.
  • Invertebrates employ a wide array of defense strategies over evolutionary timescales.
  • Specific invertebrate immune systems reviewed include those in crustaceans, tunicates, arthropods, snails, protochordates, and sea urchins.

Purpose of the Study:

  • To review and compare diverse invertebrate immune systems.
  • To identify common molecular components and mechanisms underlying immune responses.
  • To understand the evolutionary origins and fragmentation of immune gene toolkits.

Main Methods:

  • Comparative review of published literature on invertebrate immunity.
  • Analysis of immune gene families, domains, and motifs across different species.
  • Identification of recurring genetic sequences, proteins, and diversity-generating mechanisms.

Main Results:

  • No single immune-specific regulatory genetic toolkit was identified.
  • Common molecular building blocks like Toll/TLR, complement, LPS binding protein, and RAG core/Transib elements are repeatedly found.
  • Shared protein domains (NACHT, LRR, Ig, death, TIR, lectin, thioester) and diversity-generating mechanisms (gene duplication, recombination, alternative splicing, RNA editing) are prevalent.

Conclusions:

  • Invertebrate immune systems share fundamental molecular components and diversity-generating strategies, suggesting an ancient, conserved ancestral system.
  • These common elements appear fragmented in modern species due to rapid evolutionary change and gene loss.
  • The identified building materials and methods highlight conserved strategies for maintaining immune function against diverse pathogens.