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Journal of Virology, November 1998, p. 8493-8501, Vol. 72, No. 11
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Molecular Evidence for Mother-to-Child Transmission of Multiple Variants by Analysis of RNA and DNA Sequences of Human Immunodeficiency Virus Type 1

C. Pasquier,1,* C. Cayrou,1 A. Blancher,2 C. Tourne-Petheil,1 A. Berrebi,3 J. Tricoire,4 J. Puel,1 and J. Izopet1

Laboratoire de Virologie,1 Laboratoire d'Immunologie,2 and Service de Néo-Natologie,4 Centre Hospitalier Universitaire Purpan, and Service de Gynécologie Obstétrique, Hôpital La Grave,3 Toulouse, France

Received 8 May 1998/Accepted 3 August 1998

We have examined the viral selection that may occur during transmission by studying the env gene sequences from four cases of mother-to-child transmission of human immunodeficiency virus type 1. The V3 region sequences were directly amplified from both plasma viral RNA and peripheral blood mononuclear cells containing proviral DNA from mothers at delivery and at the time of diagnosis for children. Transmission occurred perinatally in three cases. The similarity of the viral sequences in each infant sample contrasted with the heterogeneous viral populations in the mothers. Phylogenetic analysis indicated the transmission of one or a few closely related maternal minor virus variants. In contrast, the child virus population in the fourth case was as heterogeneous as that of his mother, and phylogenetic analysis strongly suggested the transmission of multiple maternal variants. This case of multiple transmission was confirmed by analyzing sequences obtained at three times after delivery. Strains with sequences corresponding to the syncytium-inducing phenotype were also transmitted in this fourth case, and this was associated with the rapid development of disease in the child. There was no evidence for transmission of particular viral variants from mother to infant. We have thus described a particular case of vertical human immunodeficiency virus type 1 transmission with the transmission of multiple maternal variants to the infant and a rapid, fatal outcome in the child.

* Corresponding author. Mailing address: Laboratoire de Virologie, Hopital Purpan, Place Baylac, 31 059 Toulouse Cedex, France. Phone: 33-5-61-77-22-65. Fax: 33-5-61-77-25-42. E-mail: cpasquie{at}cict.fr.

Journal of Virology, November 1998, p. 8493-8501, Vol. 72, No. 11
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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