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Characterization and expression analysis of a complement component gene in sea cucumber (Apostichopus japonicus)

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Abstract

The complement system plays a crucial role in the innate immune system of animals. It can be activated by distinct yet overlapping classical, alternative and lectin pathways. In the alternative pathway, complement factor B (Bf) serves as the catalytic subunit of complement component 3 (C3) convertase, which plays the central role among three activation pathways. In this study, the Bf gene in sea cucumber (Apostichopus japonicus), termed AjBf, was obtained by rapid amplification of cDNA ends (RACE). The full-length cDNA of AjBf was 3231 bp in length barring the poly (A) tail. It contained an open reading frame (ORF) of 2742 bp encoding 913 amino acids, a 105 bp 5’-UTR (5’-terminal untranslated region) and a 384 bp 3’-UTR. AjBf was a mosaic protein with six CCP (complement control protein) domains, a VWA (von Willebrand factor A) domain, and a serine protease domain. The deduced molecular weight of AjBf protein was 101 kDa. Quantitative real time PCR (qRT-PCR) analysis indicated that the expression level of AjBf in A. japonicus was obviously higher at larval stage than that at embryonic stage. Expression detection in different tissues showed that AjBf expressed higher in coelomocytes than in other four tissues. In addation, AjBf expression in different tissues was induced significantly after LPS or PolyI:C challenge. These results indicated that AjBf plays an important role in immune responses to pathogen infection.

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Authors and Affiliations

  1. Liaoning Key Laboratory of Marine Fishery Molecular Biology, Liaoning Ocean and Fisheries Science Research Institute, Dalian, 116023, P. R. China

    Zhong Chen, Zunchun Zhou, Aifu Yang, Ying Dong, Xiaoyan Guan, Bei Jiang & Bai Wang

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  1. Zhong Chen
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  2. Zunchun Zhou
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  3. Aifu Yang
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  4. Ying Dong
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  5. Xiaoyan Guan
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  6. Bei Jiang
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  7. Bai Wang
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Correspondence to Zunchun Zhou.

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Chen, Z., Zhou, Z., Yang, A. et al. Characterization and expression analysis of a complement component gene in sea cucumber (Apostichopus japonicus). J. Ocean Univ. China 14, 1096–1104 (2015). https://doi.org/10.1007/s11802-015-2696-8

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  • DOI: https://doi.org/10.1007/s11802-015-2696-8

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