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Most specific and general transcription factors (TFs) become dissociated from hypoacetylated mitotic chromosomes, which may contribute to transcriptional silencing during mitosis. Only some chromosomal proteins, such as bromodomain containing protein 4 (BRD4), have a potential to associate with mitotic chromosomes in a histone acetylation-dependent manner. It remains to be fully demonstrated whether similar displacement of nuclear factors takes place in meiotic oocytes whose chromosomes become globally deacetylated. To address this, we here examined the subcellular localization of BRD4 in conjunction with the acetylation status of histones in mouse oocytes. Immunofluorescence studies revealed that BRD4 preferentially localized to mitotic chromosomes in early embryos. In contrast, not only endogenous BRD4 but also exogenous BRD4 overexpressed by mRNA microinjection were displaced from meiotic chromosomes whose histones H3 and H4 were deacetylated. Treatment with trichostatin A (TSA), an inhibitor of histone deacetylases, induced histone hyperacetylation of meiotic chromosomes from which endogenous BRD4, however, remained dissociated. Finally, meiotic chromosomal localization of BRD4 could be achieved by BRD4 overexpression together with TSA-induced histone hyperacetylation. These results indicate that, unlike mitosis, histone acetylation is necessary but not sufficient for chromosomal localization of BRD4 during meiosis, suggesting that meiotic oocytes may have additional mechanism(s) for displacement of chromosomal proteins and TFs.

Histone acetylation and subcellular localization of chromosomal protein BRD4 during mouse oocyte meiosis and mitosis†