Molecular cloning, genomic structure, polymorphism and expression analysis of major histocompatibility complex class IIA and IIB genes of half-smooth tongue sole (Cynoglossus semilaevis)

文献类型： 外文期刊

第一作者： Xu, Tian-jun

作者： Xu, Tian-jun;Chen, Song-lin;Ji, Xiang-shan;Sha, Zhen-xia;Xu, Tian-jun

作者机构：

关键词： immune response;GenBank sequence data;genomic organization;genomic structure

期刊名称：FISH & SHELLFISH IMMUNOLOGY （ 影响因子：4.581； 五年影响因子：4.851 ）

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收录情况： SCI

摘要： Major histocompatibility complex (MHC) genes play an important role in the immune response of vertebrates. Its function is to present foreign peptide to the T-cell. In order to study the function and molecular polymorphism of class II genes in teleost, the full lengths of MHC class IIA and IIB cDNA were cloned from half-smooth tongue sole by homology cloning and rapid amplification of cDNA ends polymerase chain reaction (RACE-PCR). Genomic organizations, molecular polymorphism, and expression profiles of class IIA and IIB were examined to study the function in fish. As in other teleost, four exons and three introns were identified in half-smooth tongue sole class IIA gene, five exons and four introns were identified in class 1113 gene. The deduced amino acid sequence of class IIA had 27.3-69.8% identity with those of mammal and teleost. Nine class IIA alleles were identified from four individuals. Four different alleles observed in a single individual may infer the existence of two loci at least The deduced amino acid sequence of class IIB had 7.9-71.9% identity with those of other species. Fifteen class IIB alleles were identified. Six different alleles observed in a single individual may suggest that there are at least three loci in class IIB genes. Real-time quantitative RT-PCR demonstrated that the MHC class ITA and IIB were ubiquitously expressed in twelve normal tissues. Challenge of half-smooth tongue sole with the pathogenic bacteria, Vibrio anguillarum, resulted in significant changes in the expression of MHC IIA and IIB mRNA in three tissues.

分类号： S9

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