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Article Synopsis
- Sir2 is a histone deacetylase that helps maintain the stability of ribosomal RNA genes in budding yeast by preventing DNA breaks from leading to changes in rDNA copy number.
- It does this by suppressing transcription near issues that arise during DNA replication, which can otherwise provoke double-strand breaks (DSBs) and subsequent DNA repair processes.
- When Sir2 is absent, increased transcription can lead to DSBs, resulting in unstable rDNA copy numbers and the formation of extrachromosomal DNA, highlighting the importance of Sir2 in maintaining rDNA integrity.
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