1887

Abstract

The proviral genome of the 32H reisolate of simian immunodeficiency of macaques (SIVmac32H) has been cloned and sequenced. Including both long terminal repeats, it is 10277 base pairs in length and contains open reading frames for all known SIV genes ( and ). This is the first report of an infectious SIVmac molecular clone which contains no premature termination codons. Three molecular clones of SIVmac32H have been constructed differing in sequence only within their last 1·2 kb. Two of the molecular clones, SIVmac32H(pJ5) and SIVmac32H (pC8), differ in the coding region by an in-frame deletion of four amino acids in pC8 and two conservative amino acid changes; other nucleotide changes in the 3′ LTR were not associated with known functionally critical motifs. The third clone, SIVmac32H(pB1), contains the last 1·2 kb of the SIVmac251 clone pBK28. The biological properties of virus produced after electroporation of these clones into C8166 cells has been assessed by infection of rhesus and cynomolgus macaques, time to seroconversion and by induction of cytopathic effects upon co-cultivation of infected rhesus peripheral blood lymphocytes with C8166 cells. The viruses obtained from these clones have identical growth kinetics but differ in their ability to persist in macaques. Macaques infected with pJ5 derived virus remain viraemic longer than macaques infected with pC8-derived virus. PCR analysis of circulating provirus indicates that the evolved over time in pJ5 virus-infected macaques, whereas late in infection in pC8 virus-infected macaques the gene remained invariant in sequence. These results support the observation that a deletion mutant of SIVmac239 lost its pathogenic potential and resulted in low-level viraemia when rhesus macaques were infected. Virus challenge pools for vaccine studies have been prepared for pJ5 using both human and monkey cell substrates and these stocks have been titrated both and . Virus has also been prepared from pC8 and titrated . This virus pool is being assessed as an attenuated live-virus vaccine in macaques. Since only virus originating from the SIVmac239 molecular clone is known to cause AIDSlike symptoms in rhesus macaques consistently, the SIVmac32H molecular clones should tell us more about which viral sequence features are important for the pathogenesis of AIDS.

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1994-03-01
2024-04-20
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