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By using conditional loss of suppression an an assay, we have been successful in screening for a yeast mutant which is defective in tRNA processing. The los1-1 mutation causes an accumulation of a subset of precursor tRNAs at the nonpermissive temperature. These pre-tRNAs are like those which accumulate in the yeast mutant ts 136 (rna1) in that they have transcribed intervening sequences. The mutations at los1-1 and rna1 complement and segregate independently of each other. The los1-1 mutation affects the expression of all 8 tyrosine-inserting suppressor loci, but does not seem to affect rRNA or mRNA synthesis.
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