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Genetic dissection of Anopheles gambiae gut epithelial responses to Serratia marcescens.
Stathopoulos, Stavros; Neafsey, Daniel E; Lawniczak, Mara K N; Muskavitch, Marc A T; Christophides, George K.
Afiliación
  • Stathopoulos S; Department of Life Sciences, Imperial College London, London, United Kingdom.
  • Neafsey DE; Broad Institute, Cambridge, Massachusetts, United States of America.
  • Lawniczak MK; Department of Life Sciences, Imperial College London, London, United Kingdom.
  • Muskavitch MA; Boston College, Chestnut Hill, Massachusetts, United States of America.
  • Christophides GK; Department of Life Sciences, Imperial College London, London, United Kingdom; The Cyprus Institute, Nicosia, Cyprus.
PLoS Pathog ; 10(3): e1003897, 2014 Mar.
Article en En | MEDLINE | ID: mdl-24603764
ABSTRACT
Genetic variation in the mosquito Anopheles gambiae profoundly influences its ability to transmit malaria. Mosquito gut bacteria are shown to influence the outcome of infections with Plasmodium parasites and are also thought to exert a strong drive on genetic variation through natural selection; however, a link between antibacterial effects and genetic variation is yet to emerge. Here, we combined SNP genotyping and expression profiling with phenotypic analyses of candidate genes by RNAi-mediated silencing and 454 pyrosequencing to investigate this intricate biological system. We identified 138 An. gambiae genes to be genetically associated with the outcome of Serratia marcescens infection, including the peptidoglycan recognition receptor PGRPLC that triggers activation of the antibacterial IMD/REL2 pathway and the epidermal growth factor receptor EGFR. Silencing of three genes encoding type III fibronectin domain proteins (FN3Ds) increased the Serratia load and altered the gut microbiota composition in favor of Enterobacteriaceae. These data suggest that natural genetic variation in immune-related genes can shape the bacterial population structure of the mosquito gut with high specificity. Importantly, FN3D2 encodes a homolog of the hypervariable pattern recognition receptor Dscam, suggesting that pathogen-specific recognition may involve a broader family of immune factors. Additionally, we showed that silencing the gene encoding the gustatory receptor Gr9 that is also associated with the Serratia infection phenotype drastically increased Serratia levels. The Gr9 antibacterial activity appears to be related to mosquito feeding behavior and to mostly rely on changes of neuropeptide F expression, together suggesting a behavioral immune response following Serratia infection. Our findings reveal that the mosquito response to oral Serratia infection comprises both an epithelial and a behavioral immune component.
Asunto(s)

Texto completo: 1 Colección: 01-internacional Banco de datos: MEDLINE Asunto principal: Infecciones por Serratia / Mucosa Intestinal / Anopheles Tipo de estudio: Prognostic_studies Límite: Animals Idioma: En Revista: PLoS Pathog Año: 2014 Tipo del documento: Article País de afiliación: Reino Unido

Texto completo: 1 Colección: 01-internacional Banco de datos: MEDLINE Asunto principal: Infecciones por Serratia / Mucosa Intestinal / Anopheles Tipo de estudio: Prognostic_studies Límite: Animals Idioma: En Revista: PLoS Pathog Año: 2014 Tipo del documento: Article País de afiliación: Reino Unido