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BOR - Papers in Press, published online ahead of print October 14, 2002.
Biol Reprod 2002, 10.1095/biolreprod.102.007872
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BIOLOGY OF REPRODUCTION 68, 252–261 (2003)
DOI: 10.1095/biolreprod.102.007872
© 2003 by the Society for the Study of Reproduction, Inc.

Gamete Biology

Use of Heterologous Complementary DNA Array Screening to Analyze Bovine Oocyte Transcriptome and Its Evolution During In Vitro Maturation1

Rozenn Dalbiès-Tran2,a, and Pascal Mermilloda

a Physiologie de la Reproduction et des Comportements, UMR 6073 Institut National de la Recherche Agronomique/Centre National de la Recherche Scientifique/Université François Rabelais de Tours, F-37380 Nouzilly, France

We have analyzed gene expression in bovine oocytes before and after in vitro maturation (IVM) using heterologous hybridization onto cDNA array. Total RNA was purified from pools of over 200 oocytes either immediately after aspiration from follicles at the surface of slaughterhouse cow ovaries or following in vitro maturation. Radiolabeled cDNA probes were generated by reverse-transcription followed by linear PCR amplification and were hybridized to Atlas human cDNA arrays. To our knowledge, this is the first report of gene expression profiling by this technology in the mammalian female germ cell. Our results demonstrate that cDNA array screening is a suitable method for analyzing the transcription pattern in oocytes. About 300 identified genes were reproducibly shown to be expressed in the bovine oocyte, the largest profile available so far in this model. The relative abundance of most messenger RNAs appeared stable during IVM. However, 70 transcripts underwent a significant differential regulation (by a factor of at least two). Their potential role in the context of oocyte maturation is discussed. Together they constitute a molecular signature of the degree of oocyte cytoplasmic maturation achieved in vitro.

1 Financial support by EU grant QLK3-CT-1999-00104.

2 Correspondence. FAX: 33 247 42 77 43; dalbies{at}tours.inra.fr






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Copyright © 2003 by the Society for the Study of Reproduction.