Regulation and trafficking of three distinct 18 S ribosomal RNAs during development of the malaria parasite

Journal of Molecular Biology
J LiT F McCutchan

Abstract

The human malaria parasite Plasmodium vivax has been shown to regulate the transcription of two distinct 18 RNAs during development. Here we show a third and distinctive type of ribosome that is present shortly after zygote formation, a transcriptional pattern of ribosome types that relates closely to the developmental state of the parasite and a phenomenon that separates ribosomal types at a critical phase of maturation. The A-type ribosome is predominantly found in infected erythrocytes of the vertebrate and the mosquito blood meal. Transcripts from the A gene are replaced by transcripts from another locus, the O gene, shortly after fertilization and increase in number as the parasite develops on the mosquito midgut. Transcripts from another locus, the S gene, begins as the oocyst form of the parasite matures. RNA transcripts from the S gene are preferentially included in sporozoites that bud off from the oocyst and migrate to the salivary gland while the O gene transcripts are left within the oocyst. Although all three genes are typically eukaryotic in structure, the O gene transcript, described here, varies from the other two in core regions of the rRNA that are involved in mRNA decoding and translational termination. We no...Continue Reading

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