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Immune response-related genes associated to blocking midgut dengue virus infection in Aedes aegypti strains that differ in susceptibility.

Authors
  • Caicedo, Paola A1
  • Serrato, Idalba Mildred1
  • Sim, Shuzhen2
  • Dimopoulos, George2
  • Coatsworth, Heather3
  • Lowenberger, Carl3
  • Ocampo, Clara B1
  • 1 Centro Internacional de Entrenamiento e Investigaciones Médicas (CIDEIM), Cali, Colombia. , (Colombia)
  • 2 W. Harry Feinstone Department of Molecular Microbiology and Immunology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland, USA.
  • 3 Department of Biological Sciences, Simon Fraser University, Burnaby, Canada. , (Canada)
Type
Published Article
Journal
Insect Science
Publisher
Wiley (Blackwell Publishing)
Publication Date
Aug 01, 2019
Volume
26
Issue
4
Pages
635–648
Identifiers
DOI: 10.1111/1744-7917.12573
PMID: 29389079
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Aedes (Stegomyia) aegypti, the principal global vector of dengue viruses, has differences in its susceptibility to dengue virus infection. We compared the global expression of genes in the midguts of Colombian Ae. aegypti dengue-susceptible (Cali-S) and dengue-refractory (Cali-MIB) field derived strains after ingesting either a sugarmeal, a bloodmeal, or a bloodmeal containing dengue virus serotype 2 (DENV-2). Microarray-based transcriptome analysis among treatments indicated a total of 4725 transcripts with differential expression between the two strains. Eleven genes were selected from different functional groups based on their significant up or down expression levels as well as reports in the literature suggesting they are associated with dengue virus elimination. We measured mRNA abundance of these 11 genes at 0, 8, 24, and 36 h postinfection using quantitative real time PCR (qPCR) to confirm the microarray results and assess any temporal patterns. Four genes were selected (Gram-negative binding protein-GNBP [AAEL009176], Niemann Pick Type-C2-NPC2 [AAEL015136], Keratinocyte lectin [AAEL009842], and Cathepsin-b [AAEL007585]) for knockdown experiments using RNA interference (RNAi) methodology to determine the phenotype (DENV-2 susceptible or refractory). Silencing GNBP, Cathepsin-b and Keratinocyte lectin reduced the percentage of mosquitoes with disseminated virus in the Cali-S strain to 8%, 20%, and 12% respectively compared with 96% in the controls. Silencing of NPC2 increased the percentage of mosquitos with disseminated virus infections in Cali-MIB to 66% compared with 35% in the controls. This study provides insight into genes that may contribute to the Cali-S susceptible and Cali-MIB refractory phenotypes in Ae. aegypti. © 2018 Institute of Zoology, Chinese Academy of Sciences.

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