Researchers are making a major leap in malaria research thanks to new advances in single-cell RNA sequencing. Led by researchers at the Institute of Tropical Medicine in Belgium, scientists have validated a way to study individual malaria parasites from real human infections, not just lab models.

Malaria parasites, like Plasmodium knowlesi, pass through several stages during infection. Studying those stages is crucial for understanding how the disease progresses and for developing effective treatments. But analyzing these stages one cell at a time has been difficult in low-resource settings where malaria is most common.

The team developed a method that preserves RNA in individual malaria cells, even when samples are taken in the field. They used this method on six blood samples and successfully sequenced over 22,000 individual parasite cells. The data revealed all the different life stages of P. knowlesi in the bloodstream and matched up well with a known reference database.

Experimental setup to test methods for processing Plasmodium natural infections and in vitro culture

A mock natural infection sample was prepared by mixing P. knowlesi A1-H.1 in vitro culture with human whole blood. Two combinations of leukodepletion and parasite enrichment methods were tested (PNyco and MACSPS). In addition, we processed an in vitro-cultured P. knowlesi sample, with two different density gradients: Nycodenz (PkCultureN) and Percoll (PkCultureP). For each sample 60,000 cells were loaded into a HIVE by gravity (G) or centrifuge (C). 

Importantly, the approach produced consistent results across all samples, even when different sample preparation methods were used. This means that researchers working in remote or resource-limited areas could soon generate high-quality single-cell data directly from patient samples.

This breakthrough opens the door to deeper insights into how malaria behaves in natural infections, helping scientists get closer to new interventions for a disease that still affects millions around the world.