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Evaluation of housekeeping genes as references for quantitative real-time PCR analysis of European eel, Anguilla anguilla

文献类型： 外文期刊

作者： Li, Ying-Ying 1 ; Chen, Xi 1 ; Yang, Jin-Xian 1 ; Chen, Qiang 1 ; Song, Tie-Ying 1 ; Ge, Jun-Qing 1 ;

作者机构： 1.Fujian Acad Agr Sci, Inst Biotechnol, Wusi Rd 247, Fuzhou 350003, Fujian, Peoples R China

关键词： Anguilla anguilla; housekeeping gene; quantitative real-time PCR; reference gene

期刊名称：JOURNAL OF FISH BIOLOGY （ 影响因子：2.504； 五年影响因子：2.541 ）

ISSN： 0022-1112

年卷期：

页码：

收录情况： SCI

摘要： Eels are important aquaculture species for which an increasing number of reference genes are being identified and applied. In this study, five housekeeping genes [RPL7 (ribosomal protein L7), 18 S (18 S ribosomal RNA), EF1A (elongation factor 1 alpha), ACTB (beta-actin) and GAPDH (glyceraldehyde-3-phosphate dehydrogenase)] were chosen to evaluate their reliability as reference genes for quantitative real-time PCR (qPCR) for the study of Anguilla anguilla. The expression of the selected genes in different eel tissues was determined using qPCR at different growth stages or upon challenge by Anguillid herpesvirus (AngHV), and the expression levels of these genes were then compared and evaluated using the geNorm and NormFinder algorithms. Then, RefFinder was used to comprehensively rank the examined housekeeping genes. Interestingly, the expression of the evaluated housekeeping genes exhibited tissue-dependent and treatment-dependent variations. In different growth periods A. anguilla tissues, the most stable genes were the following: ACTB in mucus; 18 S in skin and kidney; RPL7 in muscle, gill, intestine and brain; EF1A in heart and liver; and GAPDH in spleen. In contrast, in AngHV-challenged A. anguilla tissues, the most stable genes were the following: 18 S in mucus; RPL7 in skin, gill, heart, spleen, kidney and intestine; EF1A in muscle and liver; and ACTB in brain. Further comparison analysis indicated that the expression of RPL7 and EF1A was stable in multiple A. anguilla tissues in different growth periods and in eels challenged by AngHV. Nonetheless, the expression level of GAPDH in eel tissues was lower, and it was unstable in several tissues. These results indicated that the selection of reference genes for qPCR analysis in A. anguilla should be made in accordance with experimental parameters, and both RPL7 and EF1A could be used as reference genes for qPCR study of A. anguilla at different growth stages or upon challenge by AngHV. The reference genes identified in this study could improve the accuracy of qPCR data and facilitate further studies aimed at understanding the biology of eels.

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