title: Flightless-I (FliI) is a potential negative regulator of the Toll pathway in Litopenaeus vannamei.
abstract: Flightless-I (FliI) is a protein negatively modulates the Toll-like receptor (TLR) pathway through interacting with Myeloid differentiation factor 88 (MyD88). To investigate the function of FliI in innate immune responses in invertebrates, Litopenaeus vannamei FliI (LvFliI) was identified and characterized. The full-length cDNA of LvFliI is 4, 304 bp long, with an open reading frame (ORF) encoding a putative protein of 1292 amino acids, including 12 leucine-rich repeat (LRR) domains at the N-terminus and 6 gelsolin homology (GEL) domains at the C-terminus. The LvFliI protein was located in the cytoplasm and LvFliI mRNA was constitutively expressed in healthy L. vannamei, with the highest expression level in the muscle. LvFliI could be up-regulated in hemocytes after lipopolysaccharide (LPS), poly I:C, CpG-ODN2006, Vibrio parahaemolyticus, Staphylococcus aureus, and white spot syndrome virus (WSSV) challenges, suggesting a stimulation response of LvFliI to bacterial and immune stimulant challenges. Upon LPS stimulation, overexpression of LvFliI in Drosophila Schneider 2 cells led to downregulation of Drosophila and shrimp antimicrobial peptide (AMP) genes. Knockdown of LvFliI by RNA interference (RNAi) resulted in an increase of the expression of three shrimp AMP genes (PEN2, crustin, and Lyz1). However, the mortality rates of LvFliI-knockdown shrimp in response to V. parahaemolyticus, S. aureus or WSSV infections were not significantly different from those of the control group. Taken together, all the results suggested that LvFliI may play a negative role in TLR signaling response in L. vannamei.
authors.affiliation: MOE Key Laboratory of Aquatic Product Safety/State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, 135 Xingang Road West, Guangzhou 510275, PR China.
authors.forename: Shuang
authors.initials: S
authors.lastname: Zhang
authors.affiliation: School of Marine Sciences, Sun Yat-sen University, 135 Xingang Road West, Guangzhou 51027, PR China.
authors.forename: Wei
authors.initials: W
authors.lastname: Qiu
authors.affiliation: School of Marine Sciences, Sun Yat-sen University, 135 Xingang Road West, Guangzhou 51027, PR China.
authors.forename: Yong-gui
authors.initials: YG
authors.lastname: Chen
authors.affiliation: MOE Key Laboratory of Aquatic Product Safety/State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, 135 Xingang Road West, Guangzhou 510275, PR China.
authors.forename: Feng-Hua
authors.initials: FH
authors.lastname: Yuan
authors.affiliation: MOE Key Laboratory of Aquatic Product Safety/State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, 135 Xingang Road West, Guangzhou 510275, PR China.
authors.forename: Chao-Zheng
authors.initials: CZ
authors.lastname: Li
authors.affiliation: MOE Key Laboratory of Aquatic Product Safety/State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, 135 Xingang Road West, Guangzhou 510275, PR China.
authors.forename: Hui
authors.initials: H
authors.lastname: Yan
authors.affiliation: MOE Key Laboratory of Aquatic Product Safety/State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, 135 Xingang Road West, Guangzhou 510275, PR China.
authors.forename: Shao-Ping
authors.initials: SP
authors.lastname: Weng
authors.affiliation: MOE Key Laboratory of Aquatic Product Safety/State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, 135 Xingang Road West, Guangzhou 510275, PR China; School of Marine Sciences, Sun Yat-sen University, 135 Xingang Road West, Guangzhou 51027, PR China. Electronic address: lsshjg@mail.sysu.edu.cn.
authors.forename: Jian-Guo
authors.initials: JG
authors.lastname: He
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D060829:Arthropod Proteins / Q000235:genetics* / Q000378:metabolism; D001483:Base Sequence; D002460:Cell Line; D004331:Drosophila melanogaster / Q000737:chemistry; D005786:Gene Expression Regulation; D008070:Lipopolysaccharides / Q000494:pharmacology; D008969:Molecular Sequence Data; D009838:Oligodeoxyribonucleotides / Q000494:pharmacology; D033561:Penaeidae / Q000235:genetics* / Q000276:immunology* / Q000378:metabolism / Q000382:microbiology; D010802:Phylogeny; D011070:Poly I-C / Q000494:pharmacology; D016415:Sequence Alignment; D015398:Signal Transduction; D013211:Staphylococcus aureus / Q000502:physiology; D051193:Toll-Like Receptors / Q000235:genetics / Q000378:metabolism; D014736:Vibrio parahaemolyticus / Q000502:physiology; D046848:White spot syndrome virus 1 / Q000502:physiology
chemical_list: D060829:Arthropod Proteins; C408982:CPG-oligonucleotide; D008070:Lipopolysaccharides; D009838:Oligodeoxyribonucleotides; D051193:Toll-Like Receptors; D011070:Poly I-C
keywords: Antimicrobial peptide genes; Litopenaeus vannamei; LvFliI; RNA interference; Toll signal pathway