Mutant/mutation
The mutant lacks expression of MTRAP and expresses mCherry (likely under control of a constitutive promoter but no details are provided on the promoter used)

Protein (function)
The thrombospondin-related anonymous protein (TRAP) family of proteins are type I transmembrane proteins that share a functionally conserved cytoplasmic tail and an ectodomain exposing various ligand-binding modules including a thrombospondin type I repeat (TSR). In Plasmodium, the sporozoite stage expresses three members of the family—TRAP; TRAP-related protein (TREP), also called S6; and TRAP-ike protein (TLP)—which all play a role in sporozoite gliding on substrates and within tissues. The ookinete stage expresses a single member, called circumsporozoite protein and thrombospondin-related anonymous protein-related protein (CTRP), which is essential for ookinete gliding motility.
Merozoite TRAP (MTRAP) is a TRAP family member that was reported as expressed in the merozoite. The mtrap gene is conserved and syntenic among Plasmodium species.

Phenotype
Normal numbers of gametocytes are produced. Both male and female gametes cannot escape from the host red blood cell after activation of gametocytes. Evidence is presented that the parasitophorous membrane is not disrupted in the absence of MTRAP.
No fertilisation and ookinete and oocyst production.

Additional information

Other mutants
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