title: Cloning and characterization of two Campoletis chlorideae ichnovirus vankyrin genes expressed in parasitized host Helicoverpa armigera.
abstract: Polydnaviruses, symbionts of parasitic ichneumonid (ichnoviruses, IVs) and braconid (bracoviruses, BVs), are injected into hosts along with wasp eggs. Within the host, PDV genes are expressed and their products function to alter lepidopteran host physiology and enable endoparasitoid development. In the present study, we describe two Campoletis chlorideae ichnovirus (CcIV) viral ankyrin (vankyrin) genes and their transcription. The CcIV vankyrin genes possess ankyrin repeat domains that resemble the inhibitory domains of the Drosophila melanogaster NF-kappaB transcription factor inhibitor (IkappaB) cactus. The expression of CcIV vankyrin genes could be detected in Helicoverpa armigera during the whole course of parasitization with two expression peaks, 30 min post-parasitization (p.p.) and 2 days p.p. Our data indicate that the CcIV vankyrin genes are differentially expressed in the tissues of parasitized hosts and both are mainly expressed in hemocytes. The temporal and spatial variation in expression of the two CcIV vankyrin genes suggests that CcIV vankyrin genes could be involved in early protection of parasitoid eggs from host cellular immune response by suppressing NF-kappaB signaling cascades, thereby altering development and immune responses of parasitized lepidopteran hosts.
authors.affiliation: State Key Laboratory of Integrated Management of Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing 100080, China.
authors.forename: Shen-Peng
authors.initials: SP
authors.lastname: Tian
authors.forename: Ji-Hong
authors.initials: JH
authors.lastname: Zhang
authors.forename: Chen-Zhu
authors.initials: CZ
authors.lastname: Wang
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D017124:Conserved Sequence; D004279:DNA, Viral / Q000737:chemistry / Q000235:genetics; D015967:Gene Expression Regulation, Viral; D008969:Molecular Sequence Data; D009838:Oligodeoxyribonucleotides / Q000737:chemistry; D010802:Phylogeny; D018071:Polydnaviridae / Q000145:classification / Q000235:genetics* / Q000472:pathogenicity; D016133:Polymerase Chain Reaction; D012367:RNA, Viral / Q000235:genetics / Q000302:isolation & purification; D016415:Sequence Alignment; D014764:Viral Proteins / Q000737:chemistry / Q000235:genetics; D014863:Wasps / Q000821:virology*
chemical_list: D004279:DNA, Viral; D009838:Oligodeoxyribonucleotides; D012367:RNA, Viral; D014764:Viral Proteins