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Journal of Virology, November 2000, p. 10670-10680, Vol. 74, No. 22
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Immunoreactivity of Intact Virions of Human Immunodeficiency
Virus Type 1 (HIV-1) Reveals the Existence of Fewer HIV-1
Immunotypes than Genotypes
Phillipe N.
Nyambi,1
Arthur
Nádas,2
Henry A.
Mbah,1
Sherri
Burda,1
Constance
Williams,1
Miroslaw K.
Gorny,1 and
Susan
Zolla-Pazner1,3,*
Department of
Pathology1 and Institute of
Environmental Medicine,2 New York University
School of Medicine, New York, New York 10016, and Research
Center for AIDS and HIV Infection, Veterans Affairs Medical Center,
New York, New York 100103
Received 18 May 2000/Accepted 18 August 2000
In order to protect against organisms that exhibit significant
genetic variation, polyvalent vaccines are needed. Given the extreme variability of human immunodeficiency virus type 1 (HIV-1), it
is probable that a polyvalent vaccine will also be needed
for protection from this virus. However, to understand how to construct a polyvalent vaccine, serotypes or immunotypes of HIV must be identified. In the present study, we have examined the immunologic relatedness of intact, native HIV-1 primary isolates of group M, clades
A to H, with human monoclonal antibodies (MAbs) directed at epitopes in the V3, C5, and gp41 cluster I regions of the
envelope glycoproteins, since these regions are well exposed on the
virion surface. Multivariate analysis of the binding data
revealed three immunotypes of HIV-1 and five MAb groups useful for
immunotyping of the viruses. The analysis revealed that
there are fewer immunotypes than genotypes of HIV and that clustering
of the isolates did not correlate with either genotypes,
coreceptor usage (CCR5 and CXCR4), or geographic origin of the
isolates. Further analysis revealed distinct MAb groups that bound
preferentially to HIV-1 isolates belonging to particular immunotypes or
that bound to all three immunotypes; this demonstrates that viral
immunotypes identified by mathematical analysis are indeed defined by
their immunologic characteristics. In summary, these results indicate (i) that HIV-1 immunotypes can be defined, (ii) that constellations of
epitopes that are conserved among isolates belonging to each individual
HIV-1 immunotype exist and that these distinguish each of the
immunotypes, and (iii) that there are also epitopes that are routinely
shared by all immunotypes.
*
Corresponding author. Mailing address: Veterans Affairs
Medical Center, Room 18124N, 423 E. 23rd St., New York, NY 10010. Phone: (212) 263-6769. Fax: (212) 951-6321. E-mail:
zollas01{at}popmail.med.nyu.edu.
Journal of Virology, November 2000, p. 10670-10680, Vol. 74, No. 22
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
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