Nucleic Acids Research, Vol 24, Issue 2 253-256, Copyright © 1996 by Oxford University Press
V Pezo, MA Martinez and S Wain-Hobson
RNA hypermutagenesis results from cDNA synthesis in the presence of highly
biased dNTP precursor concentrations and preferentially exploits human
immunodeficiency virus type 1 (HIV-1) reverse transcriptase. Such reaction
conditions slow down DNA synthesis, which might be conducive to strand
transfer and deletion. This has been investigated. A 6 bp inverted repeat
nested between 10 bp repeats was efficiently deleted at dCTP concentrations
typically used. Inter- or intramolecular strand transfer between 10 bp
repeated sequences separated by runs of templated G residues occurred, but
at lower concentrations. If RNA hypermutagenesis of a sequence containing
direct and inverted repeats is unavoidable, avian myeloblastosis virus
(AMV) reverse transcriptase could be used, as strand transfer occurs with
much diminished dCTP substrate dependence.
ARTICLES
Fate of direct and inverted repeats in the RNA hypermutagenesis reaction
Unite de Retrovirologie Moleculaire, Institute Pasteur, Paris, France.
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