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- W2743105974 abstract "The nucleolus of the eukaryotic cell is the site of ribosome biogenesis and contains many protein factors re-quired for ribosome biogenesis. As it has been previously shown that Giardia did not have a nucleolar structure, we want to know how ribosome biogenesis occurs in Giardia . Are there any differences between Giardia and the other eukaryotes with nucleolar structures? We first identified 129 conserved common proteins which are involved in ribosome biogenesis in typical eukaryotes. Then, we used these proteins as query sequences to identify the orthologs in Giardia genomic database. Our results indicate that there are 89 orthologs of the 129 ribosomal biogenesis proteins in Giardia, some of which are involved in rRNA methylation or pseudouridine and present in 90S, pre-40S and pre-60S particles. These data suggest the ribosome biogenesis system of Giardia is similar to that of typical eukaryotes. However, there are 40 ribosomal proteins that do not have obvious orthologs in Giardia . This may imply that the ribosome biogenesis system of Giardia is simpler than that of other eukaryotes. According to these results, we argue that although Giardia does not possess nucleo-lus , its mechanism and pathway of ribosome biogenesis are similar to that of typical eukaryotes but simpler, and are differ-ent from that of prokaryotes. The present investigation provides significant insights into the origin and evolution of the nucleolus ." @default.
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- W2743105974 date "2005-10-22" @default.
- W2743105974 modified "2023-09-24" @default.
- W2743105974 title "Ribosome Biogenesis System of Giardia Inferred from Analysis of Giardial Genome" @default.
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