Molecular Characterization, Evolution and Expression Analysis of TNFSF14 and Three TNFSF Receptors in Spotted Gar <i>Lepisosteus oculatus</i>
2022
Yaxin Wu | Zhao Jia | Huifeng Dang | Hehe Xiao | Wenji Huang | Qin Liu | Kangyong Chen | Lei Zhang | Jun Zou | Junya Wang
The tumor necrosis superfamily (TNFSF) and their receptors (TNFRs) play an essential role in inflammatory responses. In this study, <i>tnfsf14</i>, <i>tnfrsf1a</i>, <i>tnfrsf1b</i> and <i>tnfrsf14</i> were identified in spotted gar. All the genes have conserved genomic organization and synteny with their respective homologs in zebrafish and humans. The putative TNFSF protein contains a typical TNF homology domain in the extracellular region. All three TNFRSFs possess characteristic cysteine-rich domains. TNFRSF1a has a death domain in the cytosolic region which is absent in the TNFRSF1b and TNFRSF14. Notably, TNFRSF14 lacks a transmembrane domain and is predicted to be secreted. Protein structure modeling revealed that the key residues involved in the interaction between TNFSF14 and TNFRSF14 are well conserved in spotted gar. All four genes were ubiquitously expressed in the spleen, liver, kidney, gills and intestine. Infection with <i>Klebsiella pneumoniae</i> resulted in remarkable downregulation of <i>tnfsf14</i> and <i>tnfrsf14</i> in tissues but upregulation of <i>tnfrsf1a</i> and <i>tnfrsf1b</i>. The results indicate that <i>tnfsf14</i>, <i>tnfrsf1a</i>, <i>tnfrsf1b</i> and <i>tnfrsf14</i> are involved in the immune response to bacterial infection, and expand knowledge on the TNF system in the primitive ray-finned fish.
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