Ribosomes are highly conserved large ribonucleoprotein (RNP) particles, consisting in yeast of a large 60S subunit and a small 40S subunit, that perform protein synthesis. Yeast ribosomes contain one copy each of four ribosomal RNAs (5S, 5.8S, 18S, and 25S; produced in two separate transcripts encoded within the rDNA repeat present as hundreds of copies on Chromosome 12) and 79 different ribosomal proteins (r-proteins), which are encoded by 137 different genes scattered about the genome, 59 of which are duplicated (7, 6). The 60S subunit contains 46 proteins and three RNA molecules: 25S RNA of 3392 nt, hydrogen bonded to the 5.8S RNA of 158 nt and associated with the 5S RNA of 121 nt. The 40S subunit has a single 18S RNA of 1798 nt and 33 proteins (8, 6). All yeast ribosomal proteins have a mammalian homolog (1). In a rapidly growing yeast cell, 60% of total transcription is devoted to ribosomal RNA, and 50% of RNA polymerase II transcription and 90% of mRNA splicing are devoted to the production of mRNAs for r-proteins. Coordinate regulation of the rRNA genes and 137 r-protein genes is affected by nutritional cues and a number of signal transduction pathways that can abruptly induce or silence the ribosomal genes, whose transcripts have naturally short lifetimes, leading to major implications for the expression of other genes as well (9, 10, 11). The expression of some r-protein genes is influenced by Abf1p (12), and most are directly induced by binding of Rap1p to their promoters, which excludes nucleosomes and recruits Fhl1p and Ifh1p to drive transcription (13). Ribosome assembly is a complex process, with different steps occurring in different parts of the cell. Ribosomal protein genes are transcribed in the nucleus, and the mRNA is transported to the cytoplasm for translation. The newly synthesized r-proteins then enter the nucleus and associate in the nucleolus with the two rRNA transcripts, one of which is methylated and pseudouridylated (
Phenotype annotations for a gene are curated single mutant phenotypes that require an
observable (e.g., "cell shape"), a qualifier (e.g., "abnormal"), a mutant type (e.g., null),
strain background, and a reference. In addition, annotations are classified as classical
genetics or high-throughput (e.g., large scale survey, systematic mutation set). Whenever
possible, allele information and additional details are provided.
A phenotype is defined as an observable (e.g., apoptosis) and a qualifier (e.g., increased). There may be more than one row with the same phenotype if that phenotype was observed in separate studies or in different conditions, strains, alleles, etc.
Increase the total number of rows showing on this page using the pull-down located below the table, or use the page
scroll at the table's top right to browse through the table's pages; use the arrows to the right of a column header
to sort by that column; filter the table using the "Filter" box at the top of the table; click on the small "i"
buttons located within a cell for an annotation to view further details.
This diagram displays phenotype observables (purple squares) that are shared between the
given gene (yellow circle) and other genes (gray circles) based on the number of phenotype
observables shared (adjustable using the slider at the bottom).
Click on a gene or phenotype observable name to go to its specific page within SGD; drag any of the gene or
observable objects around within the visualization for easier viewing; click “Reset” to automatically redraw the
diagram; filter the genes that share observable terms with the given gene by the number of terms they share by
clicking anywhere on the slider bar or dragging the tab to the desired filter number.
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Yeast Phenome
RPS0A / YGR214W Phenotype
Annotations
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Phenotype
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