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Journal articles
G-->A hypermutation of the human immunodeficiency virus type 1 genome: evidence for dCTP pool imbalance during reverse transcription.
Abstract : The quasispecies model for RNA viruses predicts the existence of a replication error threshold beyond which there is a melting or total loss of sequence information. Retroviral G-->A hypermutation is probably an example. Here it is shown that G-->A transitions may occur in both GpG and GpA dinucleotide contexts. Transitions in GpG preferentially occur via base mispairing at the ends of runs of G residues, whereas G-->A transitions within GpA may result from temporary dislocation of the primer and template strands by a single base. The two circumstances may be related by the local dCTP substrate concentration. An in vitro elongation assay shows that primer/template dislocation is more frequent for the human immunodeficiency virus type 1 reverse transcriptase than for murine or avian retroviral enzymes. Taken together these data suggest that G-->A hypermutation is an example of induced mutation whereby the viral reverse transcriptase is forced into making errors by imbalances in the intracellular dCTP concentration.
https://hal-pasteur.archives-ouvertes.fr/pasteur-03520165
Contributor : Jean-Pierre Vartanian Connect in order to contact the contributor
Submitted on : Monday, January 10, 2022 - 7:36:51 PM
Last modification on : Thursday, January 13, 2022 - 6:32:02 PM
Contributor : Jean-Pierre Vartanian Connect in order to contact the contributor
Submitted on : Monday, January 10, 2022 - 7:36:51 PM
Last modification on : Thursday, January 13, 2022 - 6:32:02 PM
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