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2017 ; 8
(ä): 209
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Evolution of Interferons and Interferon Receptors
#MMPMID28303139
Secombes CJ
; Zou J
Front Immunol
2017[]; 8
(ä): 209
PMID28303139
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The earliest jawed vertebrates (Gnathostomes) would likely have had interferon
(IFN) genes, since they are present in extant cartilaginous fish (sharks and
rays) and bony fish (lobe-finned and ray-finned fish, the latter consisting of
the chondrostei, holostei, and teleostei), as well as in tetrapods. They are
thought to have evolved from a class II helical cytokine ancestor, along with the
interleukin (IL)-10 cytokine family. The two rounds of whole genome duplication
(WGD) that occurred between invertebrates and vertebrates (1) may have given rise
to additional loci, initially containing an IL-10 ancestor and IFN ancestor,
which have duplicated further to give rise to the two loci containing the IL-10
family genes, and potentially the IFN type I and IFN type III loci (2). The
timing of the divergence of the IFN type II gene from the IL-10 family genes is
not clear but was also an early event in vertebrate evolution. Further WGD events
at the base of the teleost fish, and in particular teleost lineages (cyprinids,
salmonids), have duplicated the loci further, giving rise to additional IFN
genes, with tandem gene duplication within a locus a common occurrence. Finally,
retrotransposition events have occurred in different vertebrate lineages giving
rise to further IFN loci, with large expansions of genes at these loci in some
cases. This review will initially explore the likely IFN system present in the
earliest Gnathostomes by comparison of the known cartilaginous fish genes with
those present in mammals and will then explore the changes that have occurred in
gene number/diversification, gene organization, and the encoded proteins during
vertebrate evolution.