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Bridging The Gap
GM fungus rapidly kills 99% of malaria mosquitoes, study suggests
  Friday 31 May, 2019
GM fungus rapidly kills 99% of malaria mosquitoes, study suggests

A fungus - genetically enhanced to produce spider toxin - can rapidly kill huge numbers of the mosquitoes that spread malaria, a study suggests.

Trials, which took place in Burkina Faso, showed mosquito populations collapsed by 99% within 45 days.

The researchers say their aim is not to make the insects extinct but to help stop the spread of malaria.

The disease, which is spread when female mosquitoes drink blood, kills more than 400,000 people per year.

Worldwide, there are about 219 million cases of malaria each year.

Conducting the study, researchers at the University of Maryland in the US - and the IRSS research institute in Burkina Faso - first identified a fungus called Metarhizium pingshaense, which naturally infects the Anopheles mosquitoes that spread malaria.

The next stage was to enhance the fungus. "They're very malleable, you can genetically engineer them very easily," Prof Raymond St Leger, from the University of Maryland, told BBC News.

They turned to a toxin found in the venom of a species of funnel-web spider in Australia.

The genetic instructions for making the toxin were added to the fungus's own genetic code so it would start making the toxin once it was inside a mosquito.

"A spider uses its fangs to pierce the skin of insects and inject toxins, we replaced the fangs of spider with Metarhizium," Prof St Leger explained.

Laboratory tests showed the genetically modified fungus could kill quicker, and that it took fewer fungal spores to do the job. The next step was to test the fungus in as close to real-world conditions as possible.

A 6,500-sq-ft fake village - complete with plants, huts, water sources and food for the mosquitoes - was set up in Burkina Faso. It was surrounded by a double layer of mosquito netting to prevent anything escaping.

Source: https://www.bbc.com/news/health-48464510

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