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Developmental and Comparative Immunology 2019-Aug

Molecular cloning and functional characterization of duck TYK2.

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Aohan Guan
Dejian Liu
Jinyue Yang
Yaqian Li
Peng Zhou
Hui Jin
Rui Luo

キーワード

概要

Tyrosine kinase 2 (TYK2), a member of Janus kinase family, has been identified as a crucial protein in signal transduction initiated by interferons or interleukins in mammals. However, the function of avian TYK2 in innate immune response remains largely unknown. In this study, the full-length duck TYK2 (duTYK2) cDNA was cloned for the first time, which encoded a putative protein of 1187 amino acid residues and showed the high sequence similarity with bald eagle, crested ibis, and white-tailed tropicbird TYK2s. The duTYK2 was widely expressed in all examined tissues of healthy ducks and showed diffuse cytoplasmic localization in duck embryo fibroblasts (DEFs). Overexpression of duTYK2 significantly enhanced ISRE promoter activity and induced the expression of viperin, PKR, 2',5'-OAS, Mx and ZAP in DEFs. The C-terminal kinase domain of duTYK2 is essential for duTYK2-mediated ISRE promoter activation. Furthermore, knockdown of duTYK2 dramatically decreased duck Tembusu virus (DTMUV)-, duck enteritis virus (DEV)-, poly(I:C)- or poly(dA:dT)-induced ISRE promoter activation. Additionally, duTYK2 expression exhibited antiviral activity against DTMUV. These results indicated that duTYK2 played a critical role in duck antiviral innate immunity.

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