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First published online 16 June 2009
doi: 10.1242/jcs.049353

Journal of Cell Science 122, 2446-2452 (2009)
Published by The Company of Biologists 2009
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Research Article

BRCA1-mediated chromatin silencing is limited to oocytes with a small number of asynapsed chromosomes

Anna Kouznetsova1, Hong Wang1, Marina Bellani2, R. Daniel Camerini-Otero2, Rolf Jessberger3 and Christer Höög1,*

1 Department of Cell and Molecular Biology (CMB), Karolinska Institutet, Stockholm, S-171 77, Sweden
2 Genetics and Biochemistry Branch, National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), National Institutes of Health, Bethesda, MD 20892, USA
3 Institute of Physiological Chemistry, Medical School, MTZ, Dresden University of Technology, Dresden, D-01307, Germany

* Author for correspondence (e-mail: christer.hoog{at}ki.se)

Accepted 1 April 2009

Transcriptional silencing of the sex chromosomes during male meiosis is regarded as a manifestation of a general mechanism active in both male and female germ cells, called meiotic silencing of unsynapsed chromatin (MSUC). MSUC is initiated by the recruitment of the tumor suppressor protein BRCA1 to the axes of unsynapsed chromosomes. We now show that Sycp3, a structural component of the chromosome axis, is required for localization of BRCA1 to unsynapsed pachytene chromosomes. Importantly, we find that oocytes carrying an excess of two to three pairs of asynapsed homologous chromosomes fail to recruit enough BRCA1 to the asynapsed axes to activate MSUC. Furthermore, loss of MSUC function only transiently rescues oocytes from elimination during early postnatal development. The fact that the BRCA1-dependent synapsis surveillance system cannot respond to higher degrees of asynapsis and is dispensable for removal of aberrant oocytes argues that MSUC has a limited input as a quality control mechanism in female germ cells.

Key words: Meiosis, Oocytes, BRCA1, Meiotic silencing of unsynapsed chromatin


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