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Modified arthropod and method of use

a technology of arthropods and modified arthropods, applied in the field of arthropods and arthropodtransmitted diseases, can solve the problems of researchers not being able to colonize i>wolbachia/i>in, and achieve the effect of reducing disease transmission

Inactive Publication Date: 2011-06-16
THE UNIV OF QUEENSLAND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009]Most pathogens require a relatively long incubation period in their arthropod host before they can be transmitted to a new host. Thus, it has been proposed that a life-shortening Wolbachia bacterium may be used to reduce disease transmission by arthropod hosts that do not naturally harbour Wolbachia.
[0010]However, despite significant efforts, researchers have been unable to achieve colonization of Wolbachia in distantly related arthropod species due to the inability of Wolbachia to quickly adapt to new intra-cellular environments. To overcome this problem, the inventors have identified a need for a modified bacterium that can be easily introduced into populations of disease-transmitting arthropod vectors and reduce transmission of pathogens such as dengue virus and malaria.

Problems solved by technology

However, despite significant efforts, researchers have been unable to achieve colonization of Wolbachia in distantly related arthropod species due to the inability of Wolbachia to quickly adapt to new intra-cellular environments.

Method used

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  • Modified arthropod and method of use
  • Modified arthropod and method of use
  • Modified arthropod and method of use

Examples

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Effect test

example 1

Host Adaptation of Wolbachia after Long-Term Serial Passage in Mosquito Cell Lines

Materials and Methods

Cell Lines and Maintenance

[0211]Three cell lines were used in this study: (i) Aa23.T derived from Ae. albopictus embryos (O'Neill et al., 1997) (ii) RML-12 derived from Ae. aegypti larvae (C. E. Yunker; personal communication) (Kuno, 1983) and (iii) MOS-55 derived from An. gambiae larvae (Marhoul and Pudney, 1972). All these cell lines were confirmed as negative for Wolbachia infection prior to this study by PCR as outlined below. Aa23.T and RML-12 cell lines were maintained in growth medium consisting of equal volumes of Mitsuhashi-Maramorosch (Mitsuhashi and Maramorosch, 1964) (1 mM CaCl2, 0.2 mM MgCl2, 2.7 mM KCl, 120 mM NaCl, 1.4 mM NaHCO3, 1.3 mM NaH2PO4, 22 mM D (+) glucose, 6.5 g / L lactalbumin hydrolysate, and 5.0 g / L yeast extract) and Schneider's Insect Medium (Sigma-Aldrich, St Louis, Mo.) supplemented with 10% heat-inactivated fetal bovine serum (HIFBS). MOS-55 was maint...

example 2

Stable Introduction of a Life-Shortening Wolbachia Infection into Mosquito Aedes Aegypti

Materials and Methods

Mosquito Strains and Maintenance

[0230]The naturally uninfected JCU strain of Aedes aegypti was established from A. aegypti eggs that were field-collected from Cairns (Queensland, Australia) in 2005. For routine maintenance, eggs were hatched under vacuum for 30 min, and larvae reared at a set density of ˜150 larvae in 3 L of distilled water in plastic trays (30×40×8 cm). Larvae were fed with 150 mg (½ tablet) fish food per pan per day (Tetramin Tropical Tablets, Tetra, Germany) until pupation. Adult mosquitoes were maintained in screened 30×30×30 cm cages enclosed within transparent plastic bags, with damp cotton wool to maintain elevated humidity (25±1° C., ˜80% relative humidity (RH), 12:12 h light:dark). Adults were provided with constant access to 10% sucrose solution, and females (5 day old) supplied with a human blood source for egg production. PGYP1 and PGYP2 lines we...

example 3

Increased Locomotor Activity and Metabolism of Aedes Aegypti Infected with a Life-Shortening Strain of Wolbachia Pipientis

Materials and Methods

Experimental Organisms

[0246]The wMelPop-infected Aedes aegypti line (PGYP1) used in this study was generated as previously described (see Example 2). In brief, the Wolbachia strain, wMelPop, native to Drosophila melanogaster (Min and Benzer, 1997) was transferred into Ae. aegypti by embryonic microinjection. Descendants of this isofemale line were outcrossed for several generations to the original recipient line of mosquitoes and selected for stable infection before closing the colony. At generations 8 & 9 post-transinfection, an aposymbiotic control line was created by antibiotic treatment of the Wolbachia infected line (see Example 2). All experiments reported here were carried out on mosquitoes at generations 14-16 post trans-infection (i.e. 4-6 generations post treatment), with replicates representing different generations. Mosquitoes we...

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Abstract

A modified arthropod, an arthropod-modifying bacterium, and use thereof as an agent for control of diseases transmitted by arthropods, particularly mosquitoes, is provided. More specifically, an isolated arthropod-adapted Wolbachia bacterium capable of modifying one or more biological properties of a mosquito host is provided. The modified arthropod may be characterized as having a shortened life-span, a reduced ability to transmit disease, a reduced susceptibility to a pathogen, a reduced fecundity, and / or a reduced ability to feed from a host, when compared to a corresponding wild-type arthropod.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This patent application claims the benefit of U.S. Provisional Patent Application No. 61 / 187,805, filed Jun. 17, 2009, and Australian Patent Application No. 2009222557, filed Oct. 2, 2009, which are incorporated by reference herein.INCORPORATION-BY-REFERENCE OF MATERIAL SUBMITTED ELECTRONICALLY[0002]Incorporated by reference in its entirety herein is a computer-readable nucleotide / amino acid sequence listing submitted concurrently herewith and identified as follows: One 9,489 Byte ASCII (Text) file named “706551_ST25.TXT,” created on Jun. 17, 2010.FIELD OF THE INVENTION[0003]THIS INVENTION relates to arthropods and arthropod-transmitted diseases. More particularly, this invention relates to a modified arthropod, an arthropod-modifying bacterium, and use thereof as an agent for control of diseases transmitted by arthropods, particularly mosquitoes.BACKGROUND OF THE INVENTION[0004]Arthropods are a source of, or transmit, many diseases and c...

Claims

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Application Information

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IPC IPC(8): A01K67/033C12N1/20C12N1/36A01N63/00A01P7/00A01P7/04A01N63/20
CPCA01K67/033A01K2227/706A01K2267/02A01N63/00C12N15/87C12R1/01A01K67/0337A01K2227/70C12N15/01A01N63/20C12R2001/01C12N1/205
Inventor O'NEILL, SCOTT LESLIE
Owner THE UNIV OF QUEENSLAND
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