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• W2952658990 abstract "Summary Copy-number changes generate phenotypic variability in health and disease. Whether organisms protect against copy-number changes is largely unknown. Here, we show that Saccharomyces cerevisiae monitors the copy number of its ribosomal DNA (rDNA) and rapidly responds to copy-number loss with the clonal amplification of extrachromosomal rDNA circles (ERCs) from chromosomal repeats. ERC production is proportional to repeat loss and reaches a dynamic steady state that responds to the addition of exogenous rDNA copies. ERC levels are also modulated by RNAPI activity and diet, suggesting that rDNA copy number is calibrated against the cellular demand for rRNA. Lastly, we show that ERCs reinsert into the genome in a dosage-dependent manner, indicating that they provide a reservoir for ultimately increasing rDNA array length. Our results reveal a DNA-based mechanism for rapidly restoring copy number in response to catastrophic gene loss that shares fundamental features with unscheduled copy-number amplifications in cancer cells." @default.
• W2952658990 created "2019-06-27" @default.
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• W2952658990 date "2018-01-29" @default.
• W2952658990 modified "2023-09-30" @default.
• W2952658990 title "Genomic copy-number loss is rescued by self-limiting production of DNA circles" @default.
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• W2952658990 doi "https://doi.org/10.1101/255471" @default.
• W2952658990 hasPublicationYear "2018" @default.
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