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Roles of the L aodelphax striatellus Down syndrome cell adhesion molecule in Rice stripe virus infection of its insect vector
Author(s) -
Zhang F.,
Li Q.,
Chen X.,
Huo Y.,
Guo H.,
Song Z.,
Cui F.,
Zhang L.,
Fang R.
Publication year - 2016
Publication title -
insect molecular biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.955
H-Index - 93
eISSN - 1365-2583
pISSN - 0962-1075
DOI - 10.1111/imb.12226
Subject(s) - biology , transmembrane protein , complementary dna , transmembrane domain , alternative splicing , gene isoform , microbiology and biotechnology , genetics , gene , receptor
Abstract The arthropod Down syndrome cell adhesion molecule (Dscam) mediates pathogen‐specific recognition via an extensive protein isoform repertoire produced by alternative splicing. To date, most studies have focused on the subsequent pathogen‐specific immune response, and few have investigated the entry into cells of viruses or endosymbionts. In the present study, we cloned and characterized the cDNA of Laodelphax striatellus Dscam (LsDscam) and investigated the function of LsDscam in rice stripe virus (RSV) infection and the influence on the endosymbiont Wolbachia . LsDscam displayed a typical Dscam domain architecture, including 10 immunoglobulin (Ig) domains, six fibronectin type III domains, one transmembrane domain and a cytoplasmic tail. Alternative splicing occurred at the N‐termini of the Ig2 and Ig3 domains, the complete Ig7 domain, the transmembrane domain and the C‐terminus, comprising 10, 51, 35, two and two variable exons, respectively. Potentially LsDscam could encode at least 71 400 unique isoforms and 17 850 types of extracellular regions. LsDscam was expressed in various L. striatellus tissues. Knockdown of LsDscam mRNA via RNA interference decreased the titres of both RSV and Wolbachia , but did not change the numbers of the extracellular symbiotic bacterium Acinetobacter rhizosphaerae . Specific Dscam isoforms may play roles in enhancing the infection of vector‐borne viruses or endosymbionts.