Identification and characterisation of known and novel transcripts expressed during the final stages of human oocyte maturation

Molecular Reproduction and Development
Tetsuya GotoM Monk

Abstract

The final stages of oocyte maturation, from the germinal vesicle (GV) stage to metaphase II (MII) oocytes, are characterised by a series of dynamic events. These include germinal vesicle break down (GVBD), resumption of meiosis, and nuclear and cytoplasmic maturation to produce MII oocytes ready for fertilisation. To investigate the specific genes transcribed during these stages of oogenesis, we have prepared and analysed amplified cDNA representing the transcribed genes in a series of GV and MII oocytes. Differential display analysis disclosed that the overall gene expression profiles between different samples of GV oocytes are very similar, regardless of their source, while those between the MII oocytes are markedly variable. A comparison of expression profiles in oocytes and somatic (cumulus) cells identified several known genes preferentially-expressed in oocytes (e.g., a zona pellucida gene), as well as five novel sequences. Two of the five novel sequences are homologous to retrotransposon sequences, long terminal repeat (LTR) and long interspersed nuclear element (LINE) 1, and two other sequences show partial homology to known ESTs and genomic sequences. The remaining sequence, which is identical to shorter ESTs isolated ...Continue Reading

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