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7 November 2012 Developmental Arrest and Mouse Antral Not-Surrounded Nucleolus Oocytes
Manuela Monti, Mario Zanoni, Alberto Calligaro, Minoru S.H. Ko, Pierluigi Mauri, Carlo Alberto Redi
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The antral compartment in the ovary consists of two populations of oocytes that differ by their ability to resume meiosis and to develop to the blastocyst stage. For reasons still not entirely clear, antral oocytes termed surrounded nucleolus (SN; 70% of the population of antral oocytes) develop to the blastocyst stage, whereas those called not-surrounded nucleolus (NSN) arrest at two cells. We profiled transcriptomic, proteomic, and morphological characteristics of antral oocytes and observed that NSN oocyte arrest is associated with lack of cytoplasmic lattices coincident with reduced expression of MATER and ribosomal proteins. Cytoplasmic lattices have been shown to store maternally derived mRNA and ribosomes in mammalian oocytes and embryos, and MATER has been shown to be required for cytoplasmic lattice formation. Thus, we isolated antral oocytes from a Matertm/tm mouse and we observed that 84% of oocytes are of the NSN type. Our results provide the first molecular evidence to account for inability of NSN-derived embryos to progress beyond the two-cell stage; these results may be relevant to naturally occurring preimplantation embryo demise in mammals.

Manuela Monti, Mario Zanoni, Alberto Calligaro, Minoru S.H. Ko, Pierluigi Mauri, and Carlo Alberto Redi "Developmental Arrest and Mouse Antral Not-Surrounded Nucleolus Oocytes," Biology of Reproduction 88(1), (7 November 2012).
Received: 7 August 2012; Accepted: 1 November 2012; Published: 7 November 2012
cytoplasmic lattices
oocyte maturation
oocyte to embryo transition
preimplantation embryo development
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