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- W2068970740 abstract "The developmentally regulated transcription of the gene encoding the ookinete surface protein, Pbs21, has been investigated in the rodent malaria parasite, Plasmodium berghei, by RNA in siu hybridisation using fluorescently labelled DNA probes. We used a procedure that will allow the visualisation of cytoplasmic mRNA in the parasite and of high copy DNA repeats in the nucleus. Specific hybridisation to Pbs21 mRNA occurred in the cyptoplas of female gametocytes, zygotes and ookinetes, while asexual blood stages, male gemetocytes and gametes showed no fluorescence. Analysis of the transcription of the Pbs21 gene during blood stage development in two tightkt synchronised parasite clones using the same methodology revealed that transcription is restricted to sexual stages and is initiated in immature gametocytes at 19 h post invasion (hpi). At this point in development it is not yet possible to discriminate between the morphology of asexual trophozoites and immature gametocytes. At 24 hpi approximate 50% of the gametocytes transcribed the Pbs21 gene and the morphology of these gametocytes was identical and female. The distribution of hte mRNA encoding Pbs21 confirmed that post-transcriptional control of expression occurred in the cytoplasm by repression of translation and not through delayed transport of the message to the cytoplasm., The transcription of the Pbs21 gene is the earliest demonstrated event in gametocytogenesis in rodent malaria species to date." @default.
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- W2068970740 title "Differential expression in blood stages of the gene coding for the 21-kilodalton surface protein of ookinetes of Plasmodium berghei as detected by RNA in situ hybridisation" @default.
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- W2068970740 doi "https://doi.org/10.1016/0166-6851(94)90170-8" @default.
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