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Gene expression during oogenesis and oocyte development in mammals
1Department of Cell Biology and Anatomy, Cornell University Medical College, New York, New York 10021.
Developmental Biology (New York, N.Y. : 1985)
|January 1, 1985
Summary
Mouse oocyte development involves significant RNA synthesis changes. RNA polymerase activity increases during oocyte growth and declines as oocytes mature, impacting gene expression during meiosis.
Area of Science:
- Developmental Biology
- Molecular Biology
- Cell Biology
Background:
- Oocyte development progresses through meiotic prophase, starting in fetal life and continuing through reproductive stages.
- Oocytes grow from a pool of primordial cells, reaching full size before maturation and ovulation.
Purpose of the Study:
- To investigate the rate and patterns of RNA synthesis during mouse oocyte growth and maturation.
- To correlate RNA synthesis activity with chromosomal changes during meiotic prophase.
Main Methods:
- [3H]uridine incorporation and autoradiography to estimate RNA synthesis.
- Electron microscopy to analyze nuclear components and chromosomal structure.
- Measurement of ongoing RNA polymerase activity.
Main Results:
- RNA synthesis is moderate in early meiotic prophase and primordial oocytes, increasing severalfold during oocyte growth.
- Heterogeneous nuclear RNA (hnRNA) synthesis is rapid during mid-growth, with a short half-life.
- RNA synthesis declines in full-grown oocytes, ceasing at germinal vesicle breakdown; chromosomal structures change with synthesis rates.
Conclusions:
- Oocyte growth is characterized by a significant increase in RNA synthesis, crucial for preparing for meiosis.
- The dynamic regulation of RNA synthesis and chromosomal remodeling are key features of oocyte development.
- Understanding these processes is vital for reproductive biology and potential fertility research.