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Developmentally acquired PKA localisation in mouse oocytes and embryos

Webb, Rachel J. and Tinworth, Lorna and Thomas, Geraint M.H. and Zaccolo, Manuela and Carroll, John (2008) Developmentally acquired PKA localisation in mouse oocytes and embryos. Developmental Biology, 317 (1). pp. 36-45. ISSN 0012-1606

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Official URL: http://dx.doi.org/10.1016/j.ydbio.2008.01.045

Abstract

Localisation of Protein Kinase A (PKA) by A-Kinase Anchoring Proteins (AKAPs) is known to coordinate localised signalling complexes that target cAMP-mediated signalling to specific cellular sub-domains. The cAMP PKA signalling pathway is implicated in both meiotic arrest and meiotic resumption, thus spatio-temporal changes in PKA localisation during development may determine the oocytes response to changes in cAMP. In this study we aim to establish whether changes in PKA localisation occur during oocyte and early embryo development. Using fluorescently-labelled PKA constructs we show that in meiotically incompetent oocytes PKA is distributed throughout the cytoplasm and shows no punctuate localisation. As meiotic competence is acquired, PKA associates with mitochondria. Immature germinal vesicle (GV) stage oocytes show an aggregation of PKA around the GV and PKA remains co-localised with mitochondria throughout oocyte maturation. After fertilisation, the punctuate, mitochondrial distribution was lost, such that by the 2-cell stage there was no evidence of PKA localisation. RT-PCR and Western blotting revealed two candidate AKAPs that are known to be targeted to mitochondria, AKAP1 and D-AKAP2. In summary these data show a dynamic regulation of PKA localisation during oocyte and early embryo development.

Item Type:Article
Research Community:University of Westminster > Life Sciences, School of
ID Code:6017
Deposited On:18 Feb 2009 12:45
Last Modified:08 Dec 2011 11:17

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