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Related Experiment Videos

Retroviral mutation rates and reverse transcriptase fidelity.

Evguenia S Svarovskaia1, Sara R Cheslock, Wen-Hui Zhang

  • 1HIV Drug Resistance Program, CCR, NCI-Frederick, Frederick, Maryland 21702, USA.

Frontiers in Bioscience : a Journal and Virtual Library
|November 29, 2002
PubMed
Summary

Retroviruses generate genetic variation through high mutation rates, primarily from reverse transcriptase errors. Specific mutations, like Y586F in MLV RT, reveal how DNA structure influences these mutations.

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Area of Science:

  • Virology
  • Molecular Biology
  • Genetics

Background:

  • Retroviruses exhibit high mutation rates, crucial for immune evasion and drug resistance.
  • Reverse transcriptase (RT) errors during DNA synthesis are a primary source of retroviral genetic variation.
  • RT lacks proofreading activity, contributing to its high error rate.

Purpose of the Study:

  • To review current understanding of mutation generation in retroviruses.
  • To summarize in vivo and in vitro studies on retroviral mutation rates.
  • To explore the relationship between RT structural determinants and DNA synthesis fidelity.

Main Methods:

  • Review of in vivo and in vitro studies.
  • Analysis of retroviral mutation rates using fidelity assays.

Related Experiment Videos

  • Mutational analyses of reverse transcriptases (RTs).

    • Main Results:

    • The Y586F mutation in Moloney murine leukemia virus (MLV) RT significantly increases mutation rates near DNA bends (e.g., AAAA, TTTT tracts).
    • The template-primer duplex structure within the polymerase active site influences nucleotide selectivity and mutation rates.
    • Specific RT residues (Y586) and domains (RNase H primer grip) are identified as key in maintaining DNA synthesis fidelity.

    Conclusions:

    • Retroviral mutation rates are influenced by both polymerase errors and template-primer DNA structure.
    • Structural features of RT have evolved to mitigate the impact of DNA conformation on fidelity.
    • Understanding these mechanisms is vital for developing effective antiretroviral therapies.