Abstract:
:We have isolated and characterized cDNAs and genes for pufferfish, Fugu rubripes, (Fugu) orthologues of mammalian interleukin (IL)-12 subunits (IL-12 p35 and IL-12 p40). The deduced amino acid sequences of the Fugu IL-12 subunits showed homology with mammalian IL-12 subunits (p35: 50.4-58.0% similarity; p40: 51.2-55.4% similarity). Phylogenetic analysis confirmed that Fugu IL-12 p35 and p40 genes cluster with their mammalian counterpart lineages. The genomic organization of each of the Fugu IL-12 subunit genes is similar to that of the corresponding mouse IL-12 subunit genes, although the Fugu genes are very compact due to small intron size. Comparative genomic analysis showed conserved syntenies within the IL-12 p35 and p40 regions between Fugu and human, indicating that the Fugu IL-12 p35 and p40 genes are orthologues for mammalian IL-12 p35 and p40 encoding genes, respectively. Expression of IL-12 p35 mRNA was observed in lymphoid tissues and several non-lymphoid tissues, while expression of IL-12 p40 mRNA was constitutive and nearly ubiquitous. In the spleen and head kidney, expression of IL-12 p35 was induced by polyriboinosinic polyribocytidylic acid [poly(I:C)] and not by lipopolysaccharide (LPS), while expression of IL-12 p40 was constitutive and unresponsive to both poly(I:C) and LPS. These results indicate that IL-12 levels are regulated by production of IL-12 p35 mRNA and suggest that IL-12 in fish may be involved in antiviral defense. This is the first report of the identification and characterization of IL-12 subunit cDNAs and genes in a non-mammalian vertebrate.
journal_name
Immunogeneticsjournal_title
Immunogeneticsauthors
Yoshiura Y,Kiryu I,Fujiwara A,Suetake H,Suzuki Y,Nakanishi T,Ototake Mdoi
10.1007/s00251-003-0582-9subject
Has Abstractpub_date
2003-08-01 00:00:00pages
296-306issue
5eissn
0093-7711issn
1432-1211journal_volume
55pub_type
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