domingo, 1 de marzo de 2015

Economics of Next Generation Sequencing - February 17, 2015

Genomics|Features|Economics

Genomics & Health Impact Update with DNA in background

Economics of Genomic Medicine



Chagas Disease: Genomic Insights into a Neglected Parasitic Infection - February 20, 2015

Genomics|Features|Chagas Disease



Chagas Disease



Genetically Modifying the Insect Gut Microbiota to Control Chagas D... - PubMed - NCBI

Genetically Modifying the Insect Gut Microbiota to Control Chagas D... - PubMed - NCBI



 2015 Feb 12;9(2):e0003358. doi: 10.1371/journal.pntd.0003358. eCollection 2015.

Genetically Modifying the Insect Gut Microbiota to Control Chagas Disease Vectors through Systemic RNAi.

Abstract

Technologies based on RNA interference may be used for insect control. Sustainable strategies are needed to control vectors of Chagas disease such as Rhodnius prolixus. The insect microbiota can be modified to deliver molecules to the gut. Here, Escherichia coli HT115(DE3) expressing dsRNA for the Rhodnius heme-binding protein (RHBP) and for catalase (CAT) were fed to nymphs and adult triatomine stages. RHBP is an egg protein and CAT is an antioxidant enzyme expressed in all tissues by all developmental stages. The RNA interference effect was systemic and temporal. Concentrations of E. coli HT115(DE3) above 3.35 × 107 CFU/mL produced a significant RHBP and CAT gene knockdown in nymphs and adults. RHBP expression in the fat body was reduced by 99% three days after feeding, returning to normal levels 10 days after feeding. CAT expression was reduced by 99% and 96% in the ovary and the posterior midgut, respectively, five days after ingestion. Mortality rates increased by 24-30% in first instars fed RHBP and CAT bacteria. Molting rates were reduced by 100% in first instars and 80% in third instars fed bacteria producing RHBP or CAT dsRNA. Oviposition was reduced by 43% (RHBP) and 84% (CAT). Embryogenesis was arrested in 16% (RHBP) and 20% (CAT) of laid eggs. Feeding females 105 CFU/mL of the natural symbiont, Rhodococcus rhodnii, transformed to express RHBP-specific hairpin RNA reduced RHBP expression by 89% and reduced oviposition. Modifying the insect microbiota to induce systemic RNAi in R. prolixus may result in a paratransgenic strategy for sustainable vector control.

PMID:
 
25675102
 
[PubMed - in process] 
PMCID:
 
PMC4326462
 
Free PMC Article

Direct to Consumer Genetic Tests: Recent Oversight Developments - February 24, 2015

Genomics|Features|Oversight of Genomic Medicine

Genomics & Health Impact Update with DNA in background

Oversight of Genomic Medicine