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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Changes in regulation of ribosome synthesis during different stages of the life cycle of Saccharomyces cerevisiae.

Diploid strains of Saccharomyces cerevisiae, each homozygous for one of the temperature sensitive mutations rna2, rna3, rna4, rna6 or rna8, are temperature sensitive for ribosome synthesis during vegetative growth, but are not inhibited for ribosomal synthesis at the restrictive temperature under sporulation conditions. The continued ribosome biosynthesis at the restrictive temperature (34 degrees C) during sporulation includes de novo synthesis of both ribosomal RNA and ribosomal proteins. This lack of inhibition of ribosome biosynthesis is found even when cells committed to complete sporulation are returned to vegetative growth medium. The ribosomes synthesized at 34 degrees C are apparently functional, as they are found in polyribosomes. Although the rna mutants do not regulate ribosome synthesis during sporulation, all of these diploid strains fail to complete sporulation at 34 degrees C. The cells are arrested after the second meiotic nuclear division but before ascus formation. The failure to complete sporulation at the restrictive temperature and the inhibition of ribosome biosynthesis during growth are caused by the same mutation, because revertants selected for temperature independent growth were also able to sporulate at 34 degrees C.[1]

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