BRCA1 supports XIST RNA concentration on the inactive X chromosome

Shridar Ganesan, Daniel P. Silver, Roger A. Greenberg, Dror Avni, Ronny Drapkin, Alexander Miron, Samuel C. Mok, Voahangy Randrianarison, Steven Brodie, Jennifer Salstrom, Theodore P. Rasmussen, Ann Klimke, Christine Marrese, York Marahrens, Chu Xia Deng, Jean Feunteun, David M. Livingston

Research output: Contribution to journalArticlepeer-review

253 Scopus citations


BRCA1, a breast and ovarian tumor suppressor, colocalizes with markers of the inactive X chromosome (Xi) on Xi in female somatic cells and associates with XIST RNA, as detected by chromatin immunoprecipitation. Breast and ovarian carcinoma cells lacking BRCA1 show evidence of defects in Xi chromatin structure. Reconstitution of BRCA1-deficient cells with wt BRCA1 led to the appearance of focal XIST RNA staining without altering XIST abundance. Inhibiting BRCA1 synthesis in a suitable reporter line led to increased expression of an otherwise silenced Xi-located GFP transgene. These observations suggest that loss of BRCA1 in female cells may lead to Xi perturbation and destabilization of its silenced state.

Original languageEnglish (US)
Pages (from-to)393-405
Number of pages13
Issue number3
StatePublished - Nov 1 2002
Externally publishedYes

ASJC Scopus subject areas

  • General Biochemistry, Genetics and Molecular Biology


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