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Related Experiment Videos

Reverse transcriptases and genomic variability: the accuracy of DNA replication is enzyme specific and sequence

M Ricchetti1, H Buc

  • 1Institut Pasteur, Unité de Physicochimie des Macromolécules Biologiques, (URA1149 du CNRS), Paris, France.

The EMBO Journal
|May 1, 1990
PubMed
Summary

Reverse transcriptase enzymes show varied accuracy in incorporating DNA building blocks. HIV-1 reverse transcriptase misincorporation patterns partially match in vivo viral sequence variations, suggesting RNA template influence.

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Area of Science:

  • Molecular Biology
  • Virology
  • Enzymology

Background:

  • Reverse transcriptases (RTs) are crucial viral enzymes that synthesize DNA from RNA templates.
  • Accurate DNA synthesis by RTs is vital for viral replication, while errors can lead to mutations.
  • Understanding RT fidelity is important for antiviral drug development and studying viral evolution.

Purpose of the Study:

  • To investigate the kinetics of correct and incorrect deoxynucleotide incorporation by different reverse transcriptases.
  • To compare in vitro misincorporation patterns with in vivo genetic variability of HIV-1 gag sequences.
  • To assess the error-proneness of HIV-1 reverse transcriptase relative to other enzymes.

Main Methods:

  • Gel-based assays were used to monitor deoxynucleotide incorporation kinetics.

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  • Systematic evaluation of misincorporation frequencies at 46 specific DNA template positions.
  • Comparison of in vitro misincorporation patterns with in vivo HIV-1 gag sequence variability.

    • Main Results:

    • Significant variation in nucleotide incorporation kinetics and misincorporation frequencies among different reverse transcriptases (HIV-1, AMV, MoMLV).
    • Misincorporation patterns were highly dependent on the specific enzyme and DNA template sequence.
    • In vitro misincorporation patterns for HIV-1 RT showed fair agreement with in vivo gag sequence variability, but some in vivo changes were not explained.

    Conclusions:

    • Reverse transcriptase fidelity is enzyme- and sequence-dependent, with no universal high error rate for HIV-1 RT.
    • In vitro assays partially explain in vivo viral sequence diversity, but other mechanisms likely contribute to mismatch generation.
    • The RNA template may play a significant role in generating certain mismatches during reverse transcription.