Mosquitoes suck — but should we simply get rid of them?, Pg2

Key Highlights:

• Mosquitoes are considered the "world's deadliest animals" by the CDC, causing over a million deaths annually due to diseases they carry.
• Rising global temperatures are expanding the domain of mosquitoes, leading to increased malaria cases even in the U.S.
• Scientists are exploring methods to eradicate specific mosquito species that transmit diseases like dengue, malaria, and West Nile virus.
• The sterile insect technique, involving the release of sterile male mosquitoes, is being refined using CRISPR-Cas9 technology.
• Researchers are investigating bacteria like Wolbachia and others that can prevent mosquitoes from transmitting diseases.
• A drug called nitisinone, used for metabolic disorders, has shown potential in killing malaria-causing mosquitoes.

Detailed Insights:

• Anopheles mosquitoes, which spread malaria, are adapting to cooler and drier climates, increasing the risk of dengue and malaria for billions by 2100.
• While eradicating all mosquitoes could harm ecosystems, targeting specific disease-carrying species may not cause major ecological damage.
• The sterile insect technique aims to reduce mosquito populations by releasing sterile males that prevent viable offspring.
• CRISPR-Cas9 methods are being used to create genetically modified sterile male mosquitoes and target genes that cause "femaleness".
• Wolbachia bacteria can prevent dengue viruses from growing inside mosquitoes, reducing the spread of dengue, chikungunya, yellow fever, and Zika viruses.
• Some bacteria secrete toxic products like harmane that can block Plasmodium parasites from developing in the mosquito gut, preventing malaria transmission.
• Combining mosquito eradication with other strategies like treating infected individuals and using vaccines is crucial for combating mosquito-borne diseases.

Scientific/Technical Concepts Involved:

• CRISPR-Cas9: A gene-editing technology used to modify the genes of organisms, including mosquitoes.
• Sterile Insect Technique (SIT): A method of pest control that involves releasing sterile male insects to reduce the population.
• Wolbachia: A naturally occurring bacterium that can prevent mosquitoes from transmitting certain viruses.
• Plasmodium: A genus of parasitic protozoa that causes malaria in humans and other animals.