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Genome-wide screen identifies pathways that govern GAA/TTC repeat fragility and expansions in dividing and nondividing yeast cells.

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.

journal_name

Mol Cell

journal_title

Molecular cell

authors

Zhang Y,Shishkin AA,Nishida Y,Marcinkowski-Desmond D,Saini N,Volkov KV,Mirkin SM,Lobachev KS

doi

10.1016/j.molcel.2012.08.002

subject

Has Abstract

pub_date

2012-10-26 00:00:00

pages

254-65

issue

2

eissn

1097-2765

issn

1097-4164

pii

S1097-2765(12)00688-0

journal_volume

48

pub_type

杂志文章

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