Distribution of a Knockdown Resistance Mutation in Malaria Vectors in Kenya
Author Information
Author(s): Kawada Hitoshi, Futami Kyoko, Komagata Osamu, Kasai Shinji, Tomita Takashi, Sonye George, Mwatele Cassian, Njenga Sammy M., Mwandawiro Charles, Minakawa Noboru, Takagi Masahiro
Primary Institution: Institute of Tropical Medicine, Nagasaki University, Nagasaki, Japan
Hypothesis
What is the distribution of the L1014S mutation in Anopheles gambiae s.s. and Anopheles arabiensis in Kenya?
Conclusion
The L1014S mutation is widely distributed in Anopheles gambiae s.s. and Anopheles arabiensis in western and southern Kenya, with higher frequencies in An. gambiae s.s.
Supporting Evidence
- High allelic and homozygous frequencies of the L1014S mutation were found in An. gambiae s.s.
- The L1014S mutation was also widely distributed in An. arabiensis, although at lower frequencies.
- The mutation was found in 72.7% of sites where An. gambiae s.s. larvae were collected.
- An. arabiensis was found at 96% of the breeding sites surveyed.
- The study indicates strong selection pressure from insecticide-treated nets on mosquito populations.
Takeaway
Scientists studied mosquitoes in Kenya to see how a specific mutation that helps them resist insecticides is spread. They found that this mutation is common in one type of mosquito and less so in another.
Methodology
Mosquito larvae were collected from various habitats, and DNA was extracted to screen for the L1014S mutation using PCR and DNA sequencing.
Limitations
The study did not assess the phenotypic resistance levels of An. arabiensis.
Participant Demographics
The study focused on Anopheles gambiae s.s. and An. arabiensis larvae collected from southern and western Kenya.
Digital Object Identifier (DOI)
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