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Related Experiment Videos

Retrotransposons and regulatory suites.

James A Shapiro1

  • 1Department of Biochemistry and Molecular Biology, University of Chicago, IL 60637, USA. jsha@uchicago.edu

Bioessays : News and Reviews in Molecular, Cellular and Developmental Biology
|January 25, 2005
PubMed
Summary

Retrotransposons (RTEs) may regulate gene expression during early development. Researchers found RTE sequences in transcripts of mouse oocytes and embryos, suggesting a role in coordinating gene expression for development.

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Area of Science:

  • Developmental Biology
  • Genomics
  • Molecular Biology

Background:

  • Multicellular development relies on coordinated gene expression across dispersed genomic loci.
  • Understanding how functionally related genes share regulatory elements is crucial for developmental biology.

Purpose of the Study:

  • To investigate the potential role of retrotransposons (RTEs) in providing common regulatory motifs for coregulated gene expression during oocyte and preimplantation embryonic development.

Main Methods:

  • Analysis of cDNA libraries from full-grown mouse oocytes, 2-cell embryos, and blastocysts.
  • Identification and characterization of RTE sequences within cellular transcripts.

Main Results:

  • Retrotransposon sequences, primarily from the MT family, were found in 13% of processed transcripts in full-grown mouse oocytes.

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  • Significant percentages of RTE sequences were also detected in 2-cell and blastocyst stage embryos.
  • A quarter of these RTE sequences formed chimeric transcripts with endogenous mouse gene exons, exhibiting restricted expression in oocytes and early embryos, likely driven by LTR promoters.

    • Conclusions:

    • Retrotransposons may contribute to the coordinated regulation of gene expression during oocyte maturation and preimplantation development.
    • Chimeric transcripts involving RTEs and endogenous genes are developmentally regulated and can produce novel protein products, highlighting a novel mechanism in gene regulation.