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Reverse transcriptase in normal rhesus monkey placenta.

R J Mayer, R G Smith, R C Gallo

    Science (New York, N.Y.)
    |September 6, 1974
    PubMed
    Summary
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    Researchers found type C virus particles in primate placentas, potentially transferring genetic information during embryogenesis. An enzyme isolated from these particles showed unique properties, suggesting a role in early development.

    Area of Science:

    • Virology
    • Reproductive Biology
    • Molecular Biology

    Background:

    • Type C viruses are known from primate research.
    • Placentas are crucial for embryonic development.
    • Endogenous retroviruses can integrate into host genomes.

    Purpose of the Study:

    • To investigate the presence and nature of type C virus particles in primate placentas.
    • To characterize the reverse transcriptase enzyme associated with these particles.
    • To explore the potential role of these particles in embryogenesis.

    Main Methods:

    • Electron microscopy was used to identify viral particles in primate placentas.
    • Reverse transcriptase (RNA-dependent DNA polymerase) was isolated and purified.
    • Biochemical and immunological methods were employed to characterize the enzyme.

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    Main Results:

    • Particles resembling type C virus were observed in rhesus monkey placentas.
    • A novel reverse transcriptase was isolated and purified.
    • The enzyme was biochemically similar but immunologically distinct from known tumorigenic primate type C virus reverse transcriptases.
    • The enzyme showed immunological relation to reverse transcriptase from a baboon placenta type C virus.

    Conclusions:

    • The identified particles may represent endogenous viruses within primate placentas.
    • These endogenous viral particles and their associated enzymes could play a role in genetic information transfer during embryogenesis.