Isolation of GFP-expressing Malarial Hypnozoites by Flow Cytometry Cell Sorting.

Hypnozoites are dormant liver-stage parasites unique to relapsing malarial species, including the important human pathogen , and pose a barrier to the elimination of malaria. Little is known regarding the biology of these stages, largely due to their inaccessible location. Hypnozoites can be cultured but these cultures always consist of a mixture of hepatocytes, developing forms, and hypnozoites. Here, using a GFP-expressing line of the hypnozoite model parasite , we describe a protocol for the FACS-based isolation of malarial hypnozoites. The purified hypnozoites can be used for a range of '-omics' studies to dissect the biology of this cryptic stage of the malarial life cycle.