Zhang Y~Lobachev KS, 2012

Pubmed ID 22959270
Title Genome-wide screen identifies pathways that govern GAA/TTC repeat fragility and expansions in dividing and nondividing yeast cells.
Authors Yu Zhang, Alexander A Shishkin, Yuri Nishida, Dana Marcinkowski-Desmond, Natalie Saini, Kirill V Volkov, Sergei M Mirkin, Kirill S Lobachev
Abstract Triplex structure-forming GAA/TTC repeats pose a dual threat to the eukaryotic genome integrity. Their potential to expand can lead to gene inactivation, the cause of Friedreich's ataxia disease in humans. In model systems, long GAA/TTC tracts also act as chromosomal fragile sites that can trigger gross chromosomal rearrangements. The mechanisms that regulate the metabolism of GAA/TTC repeats are poorly understood. We have developed an experimental system in the yeast Saccharomyces cerevisiae that allows us to systematically identify genes crucial for maintaining the repeat stability. Two major groups of mutants defective in DNA replication or transcription initiation are found to be prone to fragility and large-scale expansions. We demonstrate that problems imposed by the repeats during DNA replication in actively dividing cells and during transcription initiation in nondividing cells can culminate in genome instability. We propose that similar mechanisms can mediate detrimental metabolism of GAA/TTC tracts in human cells.
Citation Mol. Cell 2012; 48:254-65


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Paper Phenotype Condition Medium Collection Tested mutants Data Details
Zhang Y~Lobachev KS, 2012 genome instability (GAA/TTC fragility, loss of chromosome arm) standard YPD hap a 4,760 Discrete

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