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A reverse transcriptase-dependent mechanism is essential for murine preimplantation development.

Ilaria Sciamanna1, Patrizia Vitullo2, Angela Curatolo3

  • 1Italian National Institute of Health (ISS), Viale Regina Elena 299, 00161 Rome, Italy. ilaria.sciamanna@iss.it.

Genes
|April 9, 2014
PubMed
Summary

The reverse transcriptase (RT) enzyme encoded by LINE-1 retrotransposons is crucial for early embryonic development. Inhibiting this RT enzyme in mouse embryos halts development, highlighting its essential regulatory role.

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Area of Science:

  • Genomics
  • Developmental Biology
  • Retrovirology

Background:

  • Long Interspersed Nuclear elements (LINE-1) and Human Endogenous Retroviruses (HERVs) constitute approximately 28% of the human genome.
  • The reverse transcriptase (RT) enzyme encoded by these retrotransposons is typically expressed at low levels in differentiated cells but is upregulated in embryonic and transformed cells.

Purpose of the Study:

  • To review evidence for the regulatory role of LINE-1-encoded RT in early embryonic development.
  • To investigate the necessity of RT activity for successful embryonic progression.

Main Methods:

  • Review of existing scientific literature on retrotransposons and embryonic development.
  • Analysis of studies involving antisense-mediated inhibition of LINE-1 expression in mouse zygotes.
  • Examination of experiments using nevirapine to inhibit endogenous RT activity in embryos.

Main Results:

  • Inhibition of LINE-1 expression in mouse zygotes led to developmental arrest at the two- or four-cell stages.
  • Pharmacological inhibition of endogenous RT activity with nevirapine also caused irreversible embryonic developmental arrest.
  • Embryonic development arrest was associated with altered gene expression profiles.

Conclusions:

  • LINE-1-encoded RT is essential for supporting early developmental progression in embryos.
  • A wave of reverse transcription occurs in zygotes shortly after fertilization, continuing through early cell divisions.
  • Reverse transcription mediated by RT is a critical component of a novel regulatory mechanism essential for proper embryonic development.