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A genome-wide siRNA screen reveals diverse cellular processes and pathways that mediate genome stability.

ABSTRACT: Signaling pathways that respond to DNA damage are essential for the maintenance of genome stability and are linked to many diseases, including cancer. Here, a genome-wide siRNA screen was employed to identify additional genes involved in genome stabilization by monitoring phosphorylation of the histone variant H2AX, an early mark of DNA damage. We identified hundreds of genes whose downregulation led to elevated levels of H2AX phosphorylation (gammaH2AX) and revealed links to cellular complexes and to genes with unclassified functions. We demonstrate a widespread role for mRNA-processing factors in preventing DNA damage, which in some cases is caused by aberrant RNA-DNA structures. Furthermore, we connect increased gammaH2AX levels to the neurological disorder Charcot-Marie-Tooth (CMT) syndrome, and we find a role for several CMT proteins in the DNA-damage response. These data indicate that preservation of genome stability is mediated by a larger network of biological processes than previously appreciated.

SUBMITTER: Paulsen RD 

PROVIDER: S-EPMC2772893 | biostudies-literature | 2009 Jul

REPOSITORIES: biostudies-literature

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A genome-wide siRNA screen reveals diverse cellular processes and pathways that mediate genome stability.

Paulsen Renee D RD   Soni Deena V DV   Wollman Roy R   Hahn Angela T AT   Yee Muh-Ching MC   Guan Anna A   Hesley Jayne A JA   Miller Steven C SC   Cromwell Evan F EF   Solow-Cordero David E DE   Meyer Tobias T   Cimprich Karlene A KA  

Molecular cell 20090701 2

Signaling pathways that respond to DNA damage are essential for the maintenance of genome stability and are linked to many diseases, including cancer. Here, a genome-wide siRNA screen was employed to identify additional genes involved in genome stabilization by monitoring phosphorylation of the histone variant H2AX, an early mark of DNA damage. We identified hundreds of genes whose downregulation led to elevated levels of H2AX phosphorylation (gammaH2AX) and revealed links to cellular complexes  ...[more]

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