Abstract
Objective
Apply Dicer siRNA to study functions of Dicer and miRNA during oogenesis.
Materials and Methods
Mouse oocytes were injected with Dicer siRNA and negative control siRNA and then matured in vitro. After IVM, oocytes were examined for maturation rates, spindle and chromosomal organization, and various gene expressions.
Results
Dicer siRNA significantly reduced maturation rates, increased abnormal spindle and chromosomal organization, and reduced the transcripts of Dicer miRNAs, spindle formation proteins (plk1 and AURKA) and spindle check points (Bub1, Bublb). Depletion of bulb16 markedly prohibited the first polar body extrusion and increased the incidence of misaligned chromosomes and abnormal meiotic spindle assembly.
Conclusion
Dicer siRNA triggered a cascade reduction for gene expressions starting from Dicer to miRNAs than to spindle assembly proteins and checkpoints which led to abnormal spindle and chromosomal organization. Thus, Dicer and miRNA appeared to play an important role during oogenesis and were essential for meiotic completion.
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Dicer and miRNAs are essential for spindle integrity and completion of meiosis I. They appear to play important roles during oogenesis and can serve as potential markers of oocyte quality.
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Liu, HC., Tang, Y., He, Z. et al. Dicer is a key player in oocyte maturation. J Assist Reprod Genet 27, 571–580 (2010). https://doi.org/10.1007/s10815-010-9456-x
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DOI: https://doi.org/10.1007/s10815-010-9456-x