Abstract
Purpose
The final stages of antral mouse oocytes maturation are characterised by the transition from transcriptionally active NSN to inactive SN oocytes. Here, we studied the profile of histone acetylation changes occurring during the NSN-to-SN transition.
Methods
During the NSN-to-SN transition, oocytes were classified based on their chromatin organisation and the immunocytochemical profile of histones H2B, H3 and H4 acetylation was analysed.
Results
We described four patterns of immunostaining common to the three acetylated histones, corresponding to stages of progressive localisation: From a diffused distribution in NSN oocytes to the association with constitutive heterochromatin and then to the nucleolar surface region in SN oocytes.
Conclusions
The maintenance of a favourable transcriptional epigenetic context, in the heterochromatin of transcriptionally silent SN oocytes, might be related to the early stages of development when transcripts from these heterochromatic regions are functional to preimplantation progression.
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Acknowledgements
We thank the following organisations for supporting this research: University of Parma (FIL), UNIPV-Regione Lombardia, Fondazione Alma Mater Ticinensis, Fondazione I.R.C.C.S. Policlinico San Matteo , and ‘Bando Giovani Ricercatori 2007’ to C.A.R.
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Capsule In late antral mouse oocytes, chromatin condenses around the nucleolus, becomes transcriptionally silent, but maintains transcriptionally permissive histone acetylation profiles, likely functional to development.
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Zuccotti, M., Bellone, M., Longo, F. et al. Fully-mature antral mouse oocytes are transcriptionally silent but their heterochromatin maintains a transcriptional permissive histone acetylation profile. J Assist Reprod Genet 28, 1193–1196 (2011). https://doi.org/10.1007/s10815-011-9562-4
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DOI: https://doi.org/10.1007/s10815-011-9562-4