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The ribosomal RNA (rDNA) sequence is the most abundant repetitive element in the budding yeast genome and forms a tandem cluster of ~100-200 copies. Cells frequently change their rDNA copy number, making rDNA the most unstable region in the budding yeast genome. The rDNA region experiences programmed replication fork arrest and subsequent formation of DNA double-strand breaks (DSBs), which are the main drivers of rDNA instability. The rDNA region offers a unique system to understand the mechanisms that respond to replication fork arrest as well as the mechanisms that regulate repeat instability. This chapter describes three methods to assess rDNA instability.


Mariko Sasaki, Takehiko Kobayashi. Gel Electrophoresis Analysis of rDNA Instability in Saccharomyces cerevisiae. Methods in molecular biology (Clifton, N.J.). 2021;2153:403-425

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PMID: 32840795

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