Three novel Toll genes (PtToll1–3) identified from a marine crab, Portunus trituberculatus: Different tissue expression and response to pathogens. Issue 2 (October 2015)

• Record Type: Journal Article
• Authors: Zhou, Su-Ming; Yuan, Xue-Mei; Liu, Shun; Li, Meng; Tao, Zhen; Wang, Guo-Liang
• Is Part Of: Fish & shellfish immunology. Volume 46:Issue 2(2015:Oct.)
• Page Start: 737
• Page End: 744
• Publication Date: 2015-10
• Subjects: Fishes -- Immunology -- Periodicals; Shellfish -- Immunology -- Periodicals; Poissons -- Immunologie -- Périodiques; Crustacés -- Immunologie -- Périodiques; 571.9617
• DOI: 10.1016/j.fsi.2015.07.027
• Languages: English
• ISSNs: 1050-4648

Abstract

<abstract xml:lang="en" abstract-type="author" id="abs0010"> <title id="sectitle0010">Abstract</title> <sec> <p id="abspara0010">The Toll signaling pathway is one of the most important regulators of the immune response in both vertebrates and invertebrates. Herein, three novel Toll (PtToll1–3) cDNA sequences were cloned from the swimming crab, <italic>Portunus trituberculatus</italic>. PtToll1 has 1003 amino acid residues and consists of an extracellular domain containing 15 leucine-rich repeats (LRRs) and a cytoplasmic Toll/interleukin-1 receptor (TIR) domain of 139 residues. PtToll2 encodes 1196 peptides, with an extracellular domain containing 28 LRRs and a cytoplasmic TIR domain. PtToll3 is 1229 residues long and contains 26 LRRs and a cytoplasmic TIR domain. Based on sequence and phylogenetic analyses, PtToll1 distinctly clustered with almost all crustacean Tolls, except <italic>Litopenaeus vannamei</italic> Toll3. However, PtToll2 and PtToll3 were separated from most reported crustacean Tolls, which mostly clustered with <italic>Drosophila melanogaster</italic> (Dm) Toll8, <italic>L. vannamei</italic> Toll3, and DmToll6. Reverse transcription PCR and real-time quantitative PCR analyses showed that PtToll1 and PtToll3 were constitutively expressed in all tissues tested, but PtToll2 mRNA was only highly enriched in gills. Upon challenges with <italic>Vibrio alginolyticus</italic>, <italic>Candida lusitaniae</italic>, or white spot syndrome virus (WSSV), the three Tolls exhibited different responses: the PtToll1 transcript was up-regulated in response to <italic>C. lusitaniae</italic> or <italic>V. alginolyticus</italic> challenge, but did not respond to WSSV challenge; both PtToll2 and PtToll3 mRNAs were down-regulated 12 h after <italic>C. lusitaniae</italic> or <italic>V. alginolyticus</italic> infection. However, WSSV elicited the expression of PtToll2 at 6 h post-infection, but suppressed transcription of PtToll3 at 24 h post-infection. The study provides valuable data for understanding the role of Toll pathways in the host defense against microbial pathogens, which will facilitate future studies on host–pathogen interactions in crabs.</p> </sec> </abstract>