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Profiling of the BRCA1 transcriptome through microarray and ChIP-chip analysis.

Abstract：

:A role for BRCA1 in the direct and indirect regulation of transcription is well established. However, a comprehensive view of the degree to which BRCA1 impacts transcriptional regulation on a genome-wide level has not been defined. We performed genome-wide expression profiling and ChIP-chip analysis, comparison of which revealed that although BRCA1 depletion results in transcriptional changes in 1294 genes, only 44 of these are promoter bound by BRCA1. However, 27% of these transcripts were linked to transcriptional regulation possibly explaining the large number of indirect transcriptional changes observed by microarray analysis. We show that no specific consensus sequence exists for BRCA1 DNA binding but rather demonstrate the presence of a number of known and novel transcription factor (TF)- binding sites commonly found on BRCA1 bound promoters. Co-immunoprecipitations confirmed that BRCA1 interacts with a number of these TFs including AP2-α, PAX2 and ZF5. Finally, we show that BRCA1 is bound to a subset of promoters of genes that are not altered by BRCA1 loss, but are transcriptionally regulated in a BRCA1-dependent manner upon DNA damage. These data suggest a model, whereby BRCA1 is present on defined promoters as part of an inactive complex poised to respond to various genotoxic stimuli.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Gorski JJ,Savage KI,Mulligan JM,McDade SS,Blayney JK,Ge Z,Harkin DP

doi

10.1093/nar/gkr679

subject

Has Abstract

pub_date

2011-12-01 00:00:00

pages

9536-48

issue

22

eissn

0305-1048

issn

1362-4962

pii

gkr679

journal_volume

39

pub_type

杂志文章

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