Key Takeaways
- New research shows malaria parasites and mosquitoes have internal biological clocks that influence disease transmission.
- An assistant professor at UC Berkeley is leading studies to explore circadian rhythms in parasites, with hopes to enhance treatment and prevention.
- Global malaria continues to affect millions, killing nearly 600,000 people annually, predominantly in sub-Saharan Africa.
Understanding Malaria’s Circadian Connection
The U.S. eradicated malaria in the early 1950s, but the disease resurged with a locally acquired case in 2023. Malaria remains a critical global health issue, causing nearly 600,000 deaths annually, particularly among children under five in sub-Saharan Africa. Approximately 290 million people are infected with malaria each year.
Malaria is caused by the Plasmodium parasite, transmitted by female Anopheles mosquitoes. Though treatments exist, the effectiveness of current vaccines is limited, and challenges persist in delivering these solutions to remote areas. Additionally, resistance is growing among parasites and mosquitoes against existing medicinal and pesticide treatments.
Researchers at UC Berkeley’s School of Public Health, led by Assistant Professor Filipa Rijo-Ferreira, are investigating the circadian rhythms of malaria parasites and their mosquito vectors. Rijo-Ferreira explains that the periodic fevers associated with malaria occur at specific times, resembling a circadian clock. This internal timing mechanism is critical for the transmission of malaria, as certain points in the day increase the likelihood of infectious bites.
A significant finding of Rijo-Ferreira’s lab indicates that the mosquito’s salivary glands are closely regulated by these biological clocks, with genes linked to blood feeding peaking just before sunset. This synchronization of host, mosquito, and parasite clocks is thought to maximize transmission potential. Interrupting this alignment could reduce infection rates.
Further research is underway, not only on malaria but also on other parasitic diseases like sleeping sickness and toxoplasmosis. Rijo-Ferreira’s work has garnered national recognition, receiving honors and funding from various prestigious institutions, including a $1.5 million grant from the National Institutes of Health (NIH) for innovative research in circadian rhythms and parasitic infections.
Rijo-Ferreira, originally from Portugal, has a distinguished academic history, having focused her studies on molecular parasitology and circadian biology across leading research institutions. She has highlighted that internal clocks in parasites represent new targets for treatment development, which was previously underestimated in the field.
Her lab currently employs a diverse team of researchers, using interdisciplinary approaches to develop tools for studying the interactions between parasites and their hosts. The ultimate goal is to disrupt these internal clocks in both the parasites and their mosquito vectors, aiming to combat parasitic infections more effectively.
In conclusion, Rijo-Ferreira’s groundbreaking work sheds light on the sophistication of parasitic behavior in relation to biological rhythms, presenting a promising avenue for combating malaria and possibly other infections in the future.
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