RRC ID 486
Author Volkoff AN, Rocher J, d'Alençon E, Bouton M, Landais I, Quesada-Moraga E, Vey A, Fournier P, Mita K, Devauchelle G.
Title Characterization and transcriptional profiles of three Spodoptera frugiperda genes encoding cysteine-rich peptides. A new class of defensin-like genes from lepidopteran insects?
Journal Gene
Abstract The present work describes sequence and transcription of three Spodoptera frugiperda genes encoding 6-cysteine-rich peptides. Sequence alignments indicate that the predicted peptides belong to the insect defensin family, although phylogenetic analyses suggest they form a cluster distinct from that of other neopteran insect defensins. The three genes were identified in a non-immune-challenged Sf9 cells cDNA (DNA complementary to RNA) library (Landais et al., Bioinformatics, in press) and were named spodoptericin, Sf-gallerimycin and Sf-cobatoxin. Spodoptericin is a novel defensin-like gene that appears to be weakly up-regulated following injection of bacteria and fungi. Interestingly, no sequence motif clearly homologous to cis regulatory element involved in the regulation of antimicrobial genes was found. An homologue of the spodoptericin gene was identified in the SilkBase Bombyx mori cDNA library. Sf-gallerimycin is related to the Galleria mellonella gallerimycin gene and is induced after immune challenge by injection of bacteria in the larval fat body as well as in hemocytes. In silico analysis of the sequence upstream from the cDNA reveals the presence of at least one motif homologous to a nuclear factor kappaB (NF-kappaB) binding site. Finally, Sf-cobatoxin is related to the G. mellonella cobatoxin-like gene. Despite high levels of constitutive expression compared to the two previous genes, transcription of Sf-cobatoxin is increased after immune, in particular, bacterial challenge. We therefore confirm that these three genes encode potential candidate molecules involved in S. frugiperda innate humoral response.
Volume 319
Pages 43-53
Published 2003-11-13
PII S0378111903007893
PMID 14597170
MeSH Amino Acid Sequence Animals Antimicrobial Cationic Peptides / genetics Base Sequence Cell Line DNA / chemistry DNA / genetics DNA, Complementary / genetics DNA, Complementary / isolation & purification Defensins / genetics Fat Body / cytology Fat Body / metabolism Gene Dosage Gene Expression Regulation Genes, Insect / genetics Hemocytes / metabolism Insect Proteins / genetics* Molecular Sequence Data Phylogeny Promoter Regions, Genetic / genetics Sequence Alignment Sequence Analysis, DNA Sequence Homology, Amino Acid Spodoptera / cytology Spodoptera / genetics* Spodoptera / microbiology Transcription, Genetic Up-Regulation
IF 2.638
Times Cited 40
Silkworms Silkbase