Richard Culleton
Department of Protozoology, Institute of Tropical Medicine
「Integrated Global Control Strategy for Tropical and Emerging Infectious Diseases」
【Gene encoding Erythrocyte Binding Ligand linked to blood stage multiplication rate in Plasmodium yoelii】
概要:
Variation in the multiplication rate of blood stage malaria parasites is often positively correlated with the severity of the disease they cause. The rodent malaria parasite Plasmodium yoelii yoelii has strains with marked differences in pathogenicity and multiplication rate in the blood. We have used genetic analysis by Linkage Group Selection (LGS) to identify genes that determine differences in multiplication rate. Genetic crosses were generated between genetically unrelated, fast- (17XYM) and slowly multiplying (33XC) clones of P. y. yoelii. The uncloned progenies of these crosses were placed under multiplication rate selection in blood infections in mice. The selected progenies were screened for reduction in intensity of quantitative genetic markers of the slowly multiplying parent. A small number of strongly selected markers, formed a linkage group on P. y. yoelii chromosome 13. Of these, that most strongly selected marked the gene encoding the P. yoelii Erythrocyte Binding Like protein (pyebl. Our genome-wide LGS analysis also indicated effects of at least one other locus on multiplication rate.