Identification and Characterization of Immunoglobulin T Heavy Chain in Large Yellow Croaker (<i>Larimichthys crocea</i>)

Yan Teng; Qiuling Fu; Yuanzhen Tan; Yangyang Ding; Yang Ding; Xinhua Chen

doi:10.3390/fishes7010029

Fishes (Jan 2022)

Identification and Characterization of Immunoglobulin T Heavy Chain in Large Yellow Croaker (<i>Larimichthys crocea</i>)

Yan Teng,
Qiuling Fu,
Yuanzhen Tan,
Yangyang Ding,
Yang Ding,
Xinhua Chen

Affiliations

Yan Teng: Key Laboratory of Marine Biotechnology of Fujian Province, Institute of Oceanology, Fujian Agriculture and Forestry University, 15 Shangxiadian Road, Fuzhou 350002, China
Qiuling Fu: Key Laboratory of Marine Biotechnology of Fujian Province, Institute of Oceanology, Fujian Agriculture and Forestry University, 15 Shangxiadian Road, Fuzhou 350002, China
Yuanzhen Tan: Key Laboratory of Marine Biotechnology of Fujian Province, Institute of Oceanology, Fujian Agriculture and Forestry University, 15 Shangxiadian Road, Fuzhou 350002, China
Yangyang Ding: Key Laboratory of Marine Biotechnology of Fujian Province, Institute of Oceanology, Fujian Agriculture and Forestry University, 15 Shangxiadian Road, Fuzhou 350002, China
Yang Ding: Key Laboratory of Marine Biotechnology of Fujian Province, Institute of Oceanology, Fujian Agriculture and Forestry University, 15 Shangxiadian Road, Fuzhou 350002, China
Xinhua Chen: Key Laboratory of Marine Biotechnology of Fujian Province, Institute of Oceanology, Fujian Agriculture and Forestry University, 15 Shangxiadian Road, Fuzhou 350002, China

DOI: https://doi.org/10.3390/fishes7010029
Journal volume & issue: Vol. 7, no. 1
p. 29

Abstract

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Three immunoglobulin (Ig) isotypes have been identified in teleosts, IgM, IgD, and IgT or IgZ. IgT, a new teleost Ig isotype, plays a vital role in mucosal immunity. However, information on molecular and functional characteristics of fish IgT is still limited. In this study, an IgT heavy chain (LcIgT) gene was cloned and characterized in large yellow croaker (Larimichthys crocea). Complete cDNA of LcIgT was 1930 bp in length, encoding a protein of 554 amino acids. The deduced LcIgT contains a VH region and only three CH regions (CH1, CH2, CH4), but no transmembrane region was predicted. Phylogenetic analysis showed that IgT heavy chain sequences from all fish species are grouped together. Homology comparison showed that LcIgT shares the highest amino acid identity of 58.73% with IgT heavy chain in Scophthalmus maximus. The VH domain of LcIgT has the highest identity of 72.50% with that of Scophthalmus maximus IgT. Relatively, each constant domain of LcIgT exhibits the highest amino acid identity with that of IgT in Oreochromis niloticus (67.61% identity for CH1, 61.11% identity for CH2, and 63.74% identity for CH4). LcIgT was constitutively expressed in various tissues tested, with the highest levels in mucosa-associated tissues such as gills and skin. After Cryptocaryon irritans infection, the mRNA levels of LcIgT were significantly up-regulated in the spleen (3.27-fold) at 4 d, in the head kidney (3.98-fold) and skin (2.11-fold) at 7 d, and in gills (4.45-fold) at 14 d. The protein levels in these detected tissues were all significantly up-regulated; the peak of its up-regulation was 6.33-fold at 28d in gills, 3.44-fold at 7d in skin, and 3.72-fold at 14d in spleen. These results showed that IgT response could be simultaneously induced in both systemic and mucosal tissues after parasitic infection and that IgT may be involved in systemic immunity and mucosal immunity against parasitic infection.

Published in Fishes

ISSN: 2410-3888 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Science: Biology (General): Genetics
Website: http://www.mdpi.com/journal/fishes

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