Coupling Transcriptional State to Large-Scale Repeat Expansions in Yeast
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Shah-2014-Coupling Transcripti.pdf
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Author(s)
Shah, Kartik A.
McGinty, Ryan J.
Egorova, Vera I.
Mirkin, Sergei M.
Shah, Kartik A
Date Issued
November 2014
Journal
Cell Reports
Publisher
Elsevier
Citation
Shah, Kartik A., Ryan J. McGinty, Vera I. Egorova, and Sergei M. Mirkin. “Coupling Transcriptional State to Large-Scale Repeat Expansions in Yeast.” Cell Reports 9, no. 5 (December 2014): 1594–1602.
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Final published version
Abstract
Expansions of simple DNA repeats cause numerous hereditary disorders in humans. Replication, repair, and transcription are implicated in the expansion process, but their relative contributions are yet to be distinguished. To separate the roles of replication and transcription in the expansion of Friedreich’s ataxia (GAA)[subscript n] repeats, we designed two yeast genetic systems that utilize a galactose-inducible GAL1 promoter but contain these repeats in either the transcribed or nontranscribed region of a selectable cassette. We found that large-scale repeat expansions can occur in the lack of transcription. Induction of transcription strongly elevated the rate of expansions in both systems, indicating that active transcriptional state rather than transcription through the repeat per se affects this process. Furthermore, replication defects increased the rate of repeat expansions irrespective of transcriptional state. We present a model in which transcriptional state, linked to the nucleosomal density of a region, acts as a modulator of large-scale repeat expansions.
MIT Department
Koch Institute for Integrative Cancer Research at MIT
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DOI of Published Version
https://doi.org/10.1016/j.celrep.2014.10.048
