Channel catfish hemoglobin genes: identification, phylogenetic and syntenic analysis, and specific induction in response to heat stress

Comparative Biochemistry and Physiology. Part D, Genomics & Proteomics
Jianbin FengZhanjiang Liu

Abstract

Hemoglobins transport oxygen from gill to inner organs in fish, and this process is affected by temperature, one of the major environmental factors for fish. The hemoglobin gene clusters have been well studied in humans and several model fish species, but remain largely unknown in catfish. Here, eight α- and six β-hemoglobin genes were identified and characterized in channel catfish. Genomic synteny analysis showed that these hemoglobin genes were separated into two unlinked clusters, the MN cluster containing six α- and six β-hemoglobin genes, and the LA cluster consisting of two α-hemoglobin genes. Channel catfish hemoglobin genes were ubiquitously expressed in all the 10 tested tissues from healthy fish, but exhibited higher expression level in spleen, head kidney, and trunk kidney. In response to heat stress, hemoglobin genes, especially MN Hbα4, MN Hbα5, MN Hbα6, MN Hbβ4, MN Hbβ5, MN Hbβ6, LA Hbα1, and LA Hbα2, presumably the embryonic hemoglobin genes, were drastically up-regulated in the gill and head kidney of heat-tolerant fishes, but not in these tissues of the heat-intolerant fish, suggesting the importance of the embryonic hemoglobin genes in coping with the low oxygen conditions under heat stress.

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Citations

Feb 28, 2015·Comparative Biochemistry and Physiology. Part D, Genomics & Proteomics·Yi TianZhanjiang Liu
Apr 10, 2016·Electrophoresis·Arabinda MahantyBimal Prasanna Mohanty
Jul 13, 2018·The Journal of Experimental Biology·Guido van den ThillartFrans Witte
Oct 18, 2018·Molecular Ecology Resources·Siv Nam Khang HoffSissel Jentoft

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