Malaria-Resistant Mosquito Developed

Innovation Might One Day Help Block Spread Of Illness That Has Killed Millions

(AP)  Researchers have developed a malaria-resistant mosquito, a step that might one day help block the spread of an illness that has claimed millions of lives around the world.

When they fed on malaria-infected mice, the resistant mosquitoes had a higher survival rate than nonresistant ones, meaning they could eventually replace the ones that can carry the disease, according to a report in Tuesday's issue of Proceedings of the National Academy of Sciences.

Jason Rasgon of the department of molecular microbiology and immunology at Johns Hopkins University cautioned that the research so far is only a proof of principle and any field tests remain far away.

Nonetheless, it's a goal eagerly sought by scientists in hope of developing a practical way of blocking the spread of malaria.

According to the federal Centers for Disease Control and Prevention, an estimated 700,000 to 2.7 million people die of malaria each year, 75 percent of them African children.

Working with the mouse form of malaria — not the human type — Rasgon's team was able to genetically engineer mosquitoes that were resistant to malaria.

Malaria infection does exact a toll on mosquitoes and in laboratory work they found that the resistant insects were able to outcompete nonresistant mosquitoes.

Starting with the same number of resistant and nonresistant mosquitoes, they found that after nine generations, the resistant type made up 70 percent of the population — raising the possibility of replacing regular mosquitoes with resistant ones that don't spread disease.

However, Rasgon stressed that in the lab work the insects were infected with a higher amount of the parasite than occurs in nature, and a larger proportion of the mosquitoes were infected.

"This was proof of principle," Rasgon said in a telephone interview. "The next step would be to work in a system more epidemiologically relevant" but still in the lab.

"We're not anywhere near a field release," he said. Now they need to turn their attention to working with human malaria and trying to engineer a mosquito resistant to that.

William C. Black IV, a professor of entomology at Colorado State University, noted that the work was done with Plasmodium berghei, which infects mice, rather than P. falciparum, which causes malaria in humans.

P. berghei is often used in laboratory work because it is easy to manipulate, but a lot of its properties are specific to that parasite and it is not always a good model for the human form, he said.

"On the other hand, finding a gene that confers resistance and is stable for a long period of time is significant," said Black, who was not part of the research team.

If they can repeat the work using the human parasite then there is a chance of taking it into the field, he said.

Dr. Woodbridge A. Foster, an entomologist at Ohio State University who was not part of the research team, said that while several labs have been trying to develop a resistant mosquito, he was not aware of any that had been developed that were both healthy and inhospitable to the malaria parasite.

Rasgon's research was funded by the National Institutes of Health.

[sirbass73]

Ok. This might just back fire on them on a diffrent level. What if this mutated mosquito mates with a normal mosquito and it creates a much stronger and deadlier form of malaria? So many more tests need to be done before they release this one form. I hope they dont do it personally. Too many things could go wrong with this.

[gaye5]

If they can produce a mosquito like this, why cant them produce a mosquito which will go and give a disease to other mosquitos which kills them all off??? It would have to be a disease which would only start to mutate after a few generations, giving it time to mate and spread its deadly disease througthout the land..

Yes rf35 we do need to have a decrease in population world wide, but not that way... it is a cruel death. Much of the world is staving, so in exchange for food or money etc they could offer vascetomies... I believe it has been done before. I personally would prefer my money go towards this, than towards the trillions we send every year to these countries to help them survive and breed more children who could die...

[rf35]

So, engineer a resistant mosquito, release it into the wild, and hope it replaces unaltered mosquitoes through natural selection. Essentially, replace the normal insect with a human-created one. What a can of worms this will open. Everyone from tree-huggers to creationists will be c.r.a.pping their pants for their turn to protest this.

In my opinion, we should leave the natural mosquitoes alone, not because I think it might harm the ecosystem or I%u2019m upset about toying with some deity%u2019s creation, because malaria performs an important human population-limiting function. More diseases like this are needed to keep the population of the planet at sustainable levels. It may sound cold, but if people won%u2019t voluntarily quit having excessive numbers of children, then something has to be done and this is nature%u2019s way of doing it.