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M94A3283.TXT
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1994-10-25
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Document 3283
DOCN M94A3283
TI Characterisation of HIV-1 virus isolates involved in mother to child
transmission.
DT 9412
AU Narwa R; Roques P; Boussin F; Marce D; Dormont D; CRSSA/CEA,
Fontenay-aux-Roses, France.
SO Int Conf AIDS. 1994 Aug 7-12;10(1):111 (abstract no. PA0062). Unique
Identifier : AIDSLINE ICA10/94369292
AB OBJECTIVE: We investigated the selection of particular subspecies of
mother's human immunodeficiency virus type 1 (HIV-1) isolates during in
utero transmission to the infant. METHODS: We characterized HIV-1
isolates involved in mother to child transmission by analyzing cell
tropism and V3, V4, V5 env gene sequences. Isolates were obtained by
peripheral blood mononuclear cell (PBMC) cultures and amplification in
cord blood cell cocultures. Eight couples of infected women/newborns and
six mothers who did not infect their babies were investigated between
the delivery and the seventh month of life. We assessed cell tropism
with human purified lymphocytes and elutriated monocytes and with
lymphoblastoid cells HUT78. Direct sequencing was performed through PCR
assay specific for HIV-1 env gene in the V3 to V5 region with DNA
extracted 1) from PBMC and 2) from cells of cultures used during isolate
amplification. RESULTS: 1) We demonstrated that all isolates were a
mixture of strongly related viruses and that all isolates seemed to be
from the MN subtype. 2) No difference was observed in cell tropism
between the isolates derived from the newborns, from their mother and
from non transmitting mothers. 3) Molecular analysis of V3: the newborn
isolates were closely related to the mother isolates and were selected
among virus quasispecies of the mother. However we did not find any
specific characteristics among the transmitted isolates. The size of the
sample is on the way to be incrised and final results will be presented
and discussed at the conference. CONCLUSION: Regarding our preliminary
results, the specificity of the transmitted viruses may be due to the
combination of multiple factors (cell tropism, immune response of the
mother, viral load, placenta) which could not be reduced to a unique
biological or molecular parameter.
DE DNA, Viral/BLOOD/GENETICS Female Fetal Blood/MICROBIOLOGY Genes, env
Human HIV Infections/COMPLICATIONS/*MICROBIOLOGY/*TRANSMISSION
HIV-1/CLASSIFICATION/GENETICS/*ISOLATION & PURIF Infant, Newborn
Leukocytes, Mononuclear/MICROBIOLOGY *Maternal-Fetal Exchange
Polymerase Chain Reaction Pregnancy Pregnancy Complications,
Infectious/*MICROBIOLOGY MEETING ABSTRACT
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).