Researchers decipher molecular basis of resistance in the African vector Anopheles funestus

November 2, 2015, Liverpool School of Tropical Medicine

Researchers at LSTM have shown the means by which one of the major species of mosquito responsible for transmitting malaria in Africa is becoming resistant to the insecticides used to treat the bednets which protect people from being bitten. This understanding can help tracking resistance and maintaining the effectiveness of tools used to control these mosquitoes.

In a paper published today in the journal PLoS Genetics a team of researchers from LSTM's Department of Vector Biology, collaborating with a colleague at the University of Liverpool, have deciphered the detailed molecular basis of resistance in the African vector Anopheles funestus.

LSTM's Dr Charles Wondji is senior author on the paper and a leading expert in vector genetics. He explained: "It is vital for the continued success of malaria control strategies that we understand, are able to identify and to anticipate the course of pyrethroid resistance in mosquitoes. Without genetic information on insecticide resistance genes and associated molecular markers this is extremely difficult.

He continued: "In this paper we demonstrated that allelic variation in major metabolic resistance genes (CYP6P9a and CYP6P9b) is the key mechanism driving pyrethroid resistance in An. funestus. Furthermore, we showed that three amino acid changes are the causative pyrethroid resistance markers. This information will allow the design of a DNA-based diagnostic assay for the early detection and tracking of resistance in the field as well as an ability to assess the true impact of resistance on malaria transmission and help ensure the continued effectiveness of pyrethroid-based interventions."

Despite the decrease in deaths from malaria in recent decades it remains a very serious public health burden in tropical world, with around 584,000 deaths worldwide in 2013 according to the World Health Organization (WHO), 90% of which were in Africa and mostly in children under the age of five. The scale up of the distribution of Long Lasting Insecticide treated Nets (LLINs) has massively contributed to the reduction in deaths in Africa. However, the success of control programmes is being threatened by growing to pyrethroid insecticides, the only class of insecticide approved by WHO for the use in bednets, among some of the mosquito populations that spread the disease.

Explore further: Professor Janet Hemingway, outlines 15 years of malaria interventions in Africa

More information: Sulaiman S. Ibrahim et al. Allelic Variation of Cytochrome P450s Drives Resistance to Bednet Insecticides in a Major Malaria Vector, PLOS Genetics (2015). DOI: 10.1371/journal.pgen.1005618

Related Stories

Professor Janet Hemingway, outlines 15 years of malaria interventions in Africa

October 8, 2015
In an editorial in the weekly science journal Nature, LSTM's Director, Professor Janet Hemingway, looks at how the last 15 years of control measures have led to massive reductions in disease prevalence in Africa since 2000. ...

How does an insecticide treated bed net actually work?

September 1, 2015
New research from the Liverpool School of Tropical Medicine has revealed precisely how insecticide-treated bed nets are so effective against malaria mosquitoes. 

Recommended for you

RNA processing and antiviral immunity

December 14, 2018
The RIG-I like receptors (RLRs) are intracellular enzyme sentries that detect viral infection and initiate a first line of antiviral defense. The cellular molecules that activate RLRs in vivo are not clear.

Faster test for Ebola shows promising results in field trials

December 13, 2018
A team of researchers with members from the U.S., Senegal and Guinea, in cooperation with Becton, Dickinson and Company (BD), has developed a faster test for the Ebola virus than those currently in use. In their paper published ...

Drug targets for Ebola, Dengue, and Zika viruses found in lab study

December 13, 2018
No drugs are currently available to treat Ebola, Dengue, or Zika viruses, which infect millions of people every year and result in severe illness, birth defects, and even death. New research from the Gladstone Institutes ...

Researchers discover new interactions between Ebola virus and human proteins

December 13, 2018
Several new connections have been discovered between the proteins of the Ebola virus and human host cells, a finding that provides insight on ways to prevent the deadly Ebola virus from reproducing and could lead to novel ...

Urbanisation and air travel leading to growing risk of pandemic

December 13, 2018
Increased arrivals by air and urbanisation are the two main factors leading to a growing vulnerability to pandemics in our cities, a University of Sydney research team has found.

Faecal transplants, 'robotic guts' and the fight against deadly gut bugs

December 13, 2018
A simple compound found in our gut could help to stop dangerous bacteria behind severe, and sometimes fatal, hospital infections.

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.