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Divergence and recombination of clinical herpes simplex virus type 2 isolates.

Forskningsöversiktsartikel
Författare Peter Norberg
Mabula J Kasubi
Lars Haarr
Tomas Bergström
Jan-Åke Liljeqvist
Publicerad i Journal of virology
Volym 81
Nummer/häfte 23
Sidor 13158-67
ISSN 1098-5514
Publiceringsår 2007
Publicerad vid Institutionen för biomedicin, avdelningen för infektionssjukdomar
Sidor 13158-67
Språk en
Länkar dx.doi.org/10.1128/JVI.01310-07
Ämnesord Cluster Analysis, DNA, Viral, chemistry, genetics, Evolution, Molecular, Genotype, Geography, Herpes Genitalis, virology, Herpesvirus 2, Human, classification, genetics, isolation & purification, Humans, Molecular Sequence Data, Norway, Phylogeny, Polymorphism, Genetic, Recombination, Genetic, Sequence Analysis, DNA, Sequence Homology, Amino Acid, Sweden, Tanzania, Viral Envelope Proteins, genetics
Ämneskategorier Mikrobiologi inom det medicinska området

Sammanfattning

Herpes simplex virus type 2 (HSV-2) infects the genital mucosa and is one of the most common sexually transmitted viruses. Here we sequenced a segment comprising 3.5% of the HSV-2 genome, including genes coding for glycoproteins G, I, and E, from 27 clinical isolates from Tanzania, 10 isolates from Norway, and 10 isolates from Sweden. The sequence variation was low compared to that described for clinical HSV-1 isolates, with an overall similarity of 99.6% between the two most distant HSV-2 isolates. Phylogenetic analysis revealed a divergence into at least two genogroups arbitrarily designated A and B, supported by high bootstrap values and evolutionarily separated at the root. Genogroup A contained isolates collected in Tanzania, and genogroup B contained isolates collected in Tanzania and Scandinavia, implying that the genetic variability of HSV-2 is higher in Tanzania than in Scandinavia. Recombination network analysis and bootscan analysis revealed a complex pattern of phylogenetically conflicting informative sites in the sequence alignments. These signals were present in synonymous and nonsynonymous sites in all three genes and were not accumulated in specific regions, observations arguing against positive selection. Since the PHI test applied solely to synonymous sites revealed a high statistical probability of recombination, we suggest as a novel finding that homologous recombination is, as reported earlier for HSV-1 and varicella-zoster virus, a prominent feature in the evolution of HSV-2.

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