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Molecular cloning, tissue distribution, and immune function of goose TLR7.

  • Yulin Qi‎ et al.
  • Immunology letters‎
  • 2015‎

TLR7 is a transmembrane endosomal protein that plays an essential role in innate antiviral responses via the recognition of conserved viral molecular patterns. Here, we cloned the full-length cDNA of goose TLR7 and carried out a molecular characterization of goose TLR7. The goose TLR7 gene is 3900 bp and encodes a 1045 amino acid protein with high homology to poultry (93% to duck and 83% to chicken). Similar conclusions were made by phylogenetic analysis. The predicted protein secondary structure of goose TLR7 contained a conserved Toll/interleukin-1 receptor domain and characteristic leucine-rich repeat regions, which has also been reported for duck TLR7. Additionally, the tissue distribution of goose TLR7 suggests that immune-associated tissues, especially the cecal tonsil and bursa of Fabricius, have high goose TLR7 expression levels. Goose TLR7 is abundantly expressed in lung tissues, which is distinct from its expression in chickens. Similar to duck TLR7, goose spleen mononuclear cells (MNCs) exposed to the mammalian TLR7 agonists R848 and Imiquimod showed significant induction of the production of proinflammatory cytokines and IFN-α. New type gosling viral enteritis virus (NGVEV) infection resulted in high mRNA expression levels of goose TLR7 in the spleen. By contrast, no direct interaction between NGVEV and goose TLR7 was detected after infecting goose spleen MNCs with NGVEV in vitro. However, triggering of goose TLR7 resulted in the rapid up-regulation of proinflammatory cytokines and anti-viral molecules, suggesting that goose TLR7 plays an important role in anti-viral defense.


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