Molecular polymorphism and expression analysis of MHC class II B gene from red sea bream (Chrysophrys major) - PubMed

Molecular polymorphism and expression analysis of MHC class II B gene from red sea bream (Chrysophrys major)

Song-Lin Chen et al. Dev Comp Immunol. 2006.

Abstract

MHC class II (major histocompatibility complex class II) plays an important role in the immune response of vertebrates. Its function is to present antigenic peptides to the T-cell receptor. In order to study the function and molecular polymorphism of class II B gene in fish, we have isolated cDNAs encoding class II B from spleen cDNA library of red sea bream (Chrysophrys major) by using EST sequencing, and examined genomic organization, molecular polymorphism and expression of red sea bream class II B gene. As in other vertebrates, five exons and four introns were identified in red sea bream class II B gene. Seven class II B alleles were identified from seven individuals of red sea bream. The deduced amino acid sequence of red sea bream MHC class II B 1(Chma-DAB*0101) had 87.1, 85.1, 87.1, 90.4, 87.1, 90.8% identity with those of red sea bream class II B 2, 3, 4, 5, 6, 7(Chma-DAB*0201-Chma-DAB*0701), respectively, and had 75.2, 74.5, 55.9, 55.1, 34.3 and 30.4% identity with those of striped sea bass, cichlid, rainbow trout, Atlantic salmon, mouse and human, respectively. Four different class II B alleles were observed in a single individual and two different 3' untranslated region (3' UTR) sequences from this individual may infer the existence of two loci at least. Semi-quantitative RT-PCR demonstrated that high expression was detected in liver, head kidney, kidney, intestine, gill, stomach, hear and spleen, low expression in muscle and blood. Challenge of red sea bream with the pathogenic bacteria, Vibrio anguillarum, resulted in a significant decrease in the expression of MHC class II B mRNA from 5 to 72 h after infection in liver, spleen, head kidney and intestine, followed by a recovery to normal level after 96 h.

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