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Nucleic Acids Res 2021 Apr 06;496:3263-3273. doi: 10.1093/nar/gkab111.
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BRCA1-BARD1 regulates transcription through BRD4 in Xenopus nucleoplasmic extract.

Barrows JK , Fullbright G , Long DT .

The tumor suppressor BRCA1 is considered a master regulator of genome integrity. Although widely recognized for its DNA repair functions, BRCA1 has also been implicated in various mechanisms of chromatin remodeling and transcription regulation. However, the precise role that BRCA1 plays in these processes has been difficult to establish due to the widespread consequences of its cellular dysfunction. Here, we use nucleoplasmic extract derived from the eggs of Xenopus laevis to investigate the role of BRCA1 in a cell-free transcription system. We report that BRCA1-BARD1 suppresses transcription initiation independent of DNA damage signaling and its established role in histone H2A ubiquitination. BRCA1-BARD1 acts through a histone intermediate, altering acetylation of histone H4K8 and recruitment of the chromatin reader and oncogene regulator BRD4. Together, these results establish a functional relationship between an established (BRCA1) and emerging (BRD4) regulator of genome integrity.

PubMed ID: 33660782
PMC ID: PMC8034626
Article link: Nucleic Acids Res
Grant support: [+]

Species referenced: Xenopus laevis
Genes referenced: bard1 brca1 brd4 h2ac21 tbp

Disease Ontology terms: breast cancer

Article Images: [+] show captions
References [+] :
Amodeo, Histone titration against the genome sets the DNA-to-cytoplasm threshold for the Xenopus midblastula transition. 2015, Pubmed, Xenbase