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2003 FEB 5 - (NewsRx.com & NewsRx.net) -- According to a study from Japan, "The Plasmodium falciparum serine repeat antigen (SERA) is one of the blood stage malaria vaccine candidates. The malaria genome project has revealed that SERA is a member of the SERA multigene family consisting of eight SERA homologues clustered on chromosome 2 and one SERA homologue on chromosome 9."
"Northern blotting and real time quantitative reverse transcription-PCR with five independent parasite strains, including three allelic representative forms of the SERA gene, have shown that all of the SERA homologues are transcribed most actively at trophozoite and schizont stages and that SERA5 (SERA/SERP) is transcribed predominantly among the family," explained S. Aoki and coauthors, Osaka University.
"Polyclonal antibodies were raised against recombinant proteins representing the N-terminal portions of four significantly transcribed SERA homologues (SERA3 to -6) in the center of the cluster on chromosome 2," according to the report. "Using these antibodies, indirect immunofluorescence microscopy detected the expression of SERA3 to -6, with similar localization, in all trophozoite- and schizont-infected erythrocytes."
"We have examined 40 sera from Ugandan adults for their antibody reactivity and found that enzyme-linked immunosorbent assay titer ...
Source: HighBeam Research, Serine repeat antigen-based immunization shows promise.