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Proto-oncogenes and embryonic development.

M Méchali1, M Gusse, S Vriz

  • 1Institut Jacques Monod, Paris, France.

Biochimie
|July 1, 1988
PubMed
Summary
This summary is machine-generated.

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Proto-oncogenes, like the myc gene, are crucial for embryonic development. In Xenopus, myc RNA is abundant maternally but rapidly degraded post-fertilization, regulating early cell division.

Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Genetics

Background:

  • Proto-oncogenes play vital roles in embryonic development.
  • The amphibian Xenopus laevis is a well-established model organism for developmental studies.
  • Major proto-oncogene families, including the myc gene, are present in the Xenopus genome.

Purpose of the Study:

  • To investigate the role of proto-oncogenes in embryonic development using Xenopus laevis.
  • To analyze the developmental control of the myc gene during Xenopus embryogenesis.

Main Methods:

  • Utilized a characterized Xenopus myc probe for gene expression analysis.
  • Employed specific antibodies to detect myc protein accumulation.
  • Quantified myc RNA levels in oocytes, unfertilized eggs, and embryonic cells.

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Main Results:

  • The myc gene is highly expressed as stable maternal mRNA in oocytes, with eggs containing 5 X 10(5)-fold more myc RNA than somatic cells.
  • Fertilization initiates post-transcriptional regulation, leading to rapid degradation of myc RNA to 10-30 copies per gastrula cell.
  • The 62K myc protein accumulates late in oogenesis, uncoupled from immediate cell proliferation.

Conclusions:

  • The Xenopus myc gene exhibits specific developmental regulation, with maternal mRNA serving as a reservoir.
  • Post-transcriptional control mechanisms tightly regulate myc RNA levels after fertilization.
  • This regulation is adapted to support the rapid cell cleavages characteristic of early Xenopus embryogenesis.