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2015 ; 57
(ä): 235-64
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gab.com Text
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Unique Features of Fish Immune Repertoires: Particularities of Adaptive Immunity
Within the Largest Group of Vertebrates
#MMPMID26537384
Magadan S
; Sunyer OJ
; Boudinot P
Results Probl Cell Differ
2015[]; 57
(ä): 235-64
PMID26537384
show ga
Fishes (i.e., teleost fishes) are the largest group of vertebrates. Although
their immune system is based on the fundamental receptors, pathways, and cell
types found in all groups of vertebrates, fishes show a diversity of particular
features that challenge some classical concepts of immunology. In this chapter,
we discuss the particularities of fish immune repertoires from a comparative
perspective. We examine how allelic exclusion can be achieved when multiple Ig
loci are present, how isotypic diversity and functional specificity impact clonal
complexity, how loss of the MHC class II molecules affects the cooperation
between T and B cells, and how deep sequencing technologies bring new insights
about somatic hypermutation in the absence of germinal centers. The unique
coexistence of two distinct B-cell lineages respectively specialized in systemic
and mucosal responses is also discussed. Finally, we try to show that the diverse
adaptations of immune repertoires in teleosts can help in understanding how
somatic adaptive mechanisms of immunity evolved in parallel in different lineages
across vertebrates.