Abstract：
:Females with germline mutations in BRCA1 are predisposed to develop breast and ovarian cancers. A previous report indicated that BRCA1 colocalizes with and is necessary for the correct localization of XIST, a noncoding RNA that coats the inactive X chromosome (Xi) to mediate formation of facultative heterochromatin. A model emerged from this study suggesting that loss of BRCA1 in female cells could reactivate genes on the Xi through loss of the XIST RNA. However, our independent studies of BRCA1 and XIST RNA revealed little evidence to support this model. We report that BRCA1 is not enriched on XIST RNA-coated chromatin of the Xi. Neither mutation nor depletion of BRCA1 causes significant changes in XIST RNA localization or X-linked gene expression. Together, these results do not support a role for BRCA1 in promoting XIST RNA localization to the Xi or regulating XIST-dependent functions in maintaining the stability of facultative heterochromatin.
journal_name
Celljournal_title
Cellauthors
Xiao C,Sharp JA,Kawahara M,Davalos AR,Difilippantonio MJ,Hu Y,Li W,Cao L,Buetow K,Ried T,Chadwick BP,Deng CX,Panning Bdoi
10.1016/j.cell.2007.01.034subject
Has Abstractpub_date
2007-03-09 00:00:00pages
977-89issue
5eissn
0092-8674issn
1097-4172pii
S0092-8674(07)00179-1journal_volume
128pub_type
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