Abstract
The rapid tRNA decay (RTD) pathway is a tRNA quality control pathway known to degrade several specific hypomodified or destabilized tRNAs in the yeast Saccharomyces cerevisiae. In this chapter, we describe seven methods for identifying RTD substrates, with a focus on two new approaches: a high-throughput approach that utilizes a suppressor tRNA library, fluorescence-activated cell sorting, and deep sequencing, and has greatly expanded the known range of RTD substrates; and a poison primer extension assay that allows for the measurement of levels of suppressor tRNA variants, even in the presence of highly similar endogenous tRNAs. We also discuss different applications of the use of the high-throughput and poison primer extension methodologies for different problems in tRNA biology.
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