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Cloning and characterization of Bax1 and Bax2 genes of Ctenopharyngodon idellus and evaluation of transcript expression in response to grass carp reovirus infection

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Abstract

Multidomain proapoptotic Bcl-2-associated X (Bax) protein is an essential effector responsible for mitochondrial outer membrane permeabilization, resulting in cell death via apoptosis. In this study, two Bax genes of grass carp (Ctenopharyngodon idellus), designated as CiBax1 and CiBax2, were isolated and analyzed. The obtained CiBax1 cDNA is 2058 bp long, with a 579 bp open reading frame (ORF) coding a protein of 192 amino acid residues. The full-length cDNA of CiBax2 is 1161 bp, with a 618 bp ORF coding 205 amino acids. Both CiBax1 and CiBax2 are typical members of Bcl-2 family containing conserved Bcl and C-terminal domains, and they share conserved synteny with zebrafish Bax genes despite the grass carp Bax mapping to different linkage groups. Phylogenetic analysis showed that CiBax1 was clustered with Bax from most teleost fish, and CiBax2 was close to Bax2 from teleost fish but far separated from that of Salmo salar. Quantitative real-time PCR analysis revealed broad expression of CiBax1 and CiBax2 in tissues from healthy grass carp, but the relative expression level differed. The mRNA expression of CiBax1 and CiBax2 was both upregulated significantly and peaked in all examined tissues at days 5 or 6 post-infection with grass carp reovirus. Subcellular localization indicated that CiBax1 protein was localized in both nucleus and cytosol, while CiBax2 protein only in cytosol. Moreover, CiBax2, but not CiBax1 was colocalized with mitochondrion under normal condition. Taken together, the findings would be helpful for further understanding of the function of Bax in teleost fish.

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Acknowledgments

This work was supported by grants from the National Natural Science Foundation of China (No. 31130055), the National High Technology Research and Development Program (No. 2011AA100403), and the Direction Program of Chinese Academy of Sciences (No. KSCX2-EW-N-004-3).

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Authors and Affiliations

  1. State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China

    Hao Wang, Libo He, Yongyan Pei, Pengfei Chu, Rong Huang, Yongming Li, Lanjie Liao, Zuoyan Zhu & Yaping Wang

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Hao Wang, Yongyan Pei & Pengfei Chu

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  1. Hao Wang
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  2. Libo He
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  3. Yongyan Pei
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  4. Pengfei Chu
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  5. Rong Huang
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  6. Yongming Li
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  7. Lanjie Liao
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  8. Zuoyan Zhu
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  9. Yaping Wang
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Correspondence to Yaping Wang.

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Wang, H., He, L., Pei, Y. et al. Cloning and characterization of Bax1 and Bax2 genes of Ctenopharyngodon idellus and evaluation of transcript expression in response to grass carp reovirus infection. Fish Physiol Biochem 42, 1369–1382 (2016). https://doi.org/10.1007/s10695-016-0225-3

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  • DOI: https://doi.org/10.1007/s10695-016-0225-3

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