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Analysis of immune-relevant genes expressed in red sea bream (Chrysophrys major) spleen

文献类型: 外文期刊

作者: Chen, SL 1 ; Xu, MY 2 ; Hu, SN 2 ; Li, L 2 ;

作者机构: 1.Chinese Acad Fisheries Sci, Yellow Sea Fisheries Res Inst, Qingdao 266071, Peoples R China

2.Chinese Acad Fisheries Sci, Yellow Sea Fisheries Res Inst, Qingdao 266071, Peoples R China; Chinese Acad Sci, Huada Gene Res Ctr, Beijing 101300, Peoples R China

关键词: Est;Immune-relevant genes;Mhc ii;Rap2c;Spleen;Red sea bream;Immunoglobulin light-chain;Catfish ictalurus-punctatus;Complex;class-ii;Trout oncorhynchus-mykiss;Salmon salmo-salar;Channel;catfish;Rainbow-trout;Initial analysis;Atlantic salmon;Beta-chain

期刊名称:AQUACULTURE ( 影响因子:4.242; 五年影响因子:4.723 )

ISSN:

年卷期:

页码:

收录情况: SCI

摘要: Expressed sequence tag (EST) analysis is an efficient tool for gene discovery and for profiling gene expression. In order to isolate functional genes involved in immunity in fish, a cDNA library was constructed from red sea bream (Chrysophrys major) spleen by unidirectional cloning. A total of 2010 ESTs from the library was sequenced and compared with sequences in the GenBank database. Of the 2010 ESTs, 320 ESTs (15.9%) were identified as orthologs of known gene from other organisms by BLAST searches, whereas 1690 ESTs (84.1%) appeared to be unknown and are likely to represent newly described genes. These identified clones were derived from at least 81 genes, which were categorized into eight categories: 9 in cell structure/motility (11.1%), 14 in metabolism (17.3%), 8 in cell defense/immunity (10%), 5 in cell division (6.2%), 7 in cell signal transduction/communication (8.6%), 30 in gene/protein expression (37%), 5 hemoglobin (6.2%) and 3 genes lacking enough information to be classified (3.7%). Several important cDNAs involved in immune functions, such as immumoglobulin light chain (IgL), MHC class Ilalpha, MHC class IIbeta and RAP2c, were identified in red sea bream and compared for their structure with those from other organisms. Alignment showed that the red sea bream IgL precursor was closer to that of spotted wolfish than to that of yellowtail, Europe sea bass, orange spotted grouper, Atlantic salmon, channel catfish, fugu and sterlet. Phylogenetic analysis indicated that the red sea bream MHC IIalpha and MHC IIbeta were more related to those from striped sea bass than to those from cichlid, flounder, salmonids, zebrafish and carp. High identity (over 92%) in deduced amino acid sequence of RAP2c between red sea bream and mammals implied that RAP2c gene was highly conserved during evolution. (C) 2004 Elsevier B.V

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