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M9480864.TXT
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1994-09-05
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Document 0864
DOCN M9480864
TI Identification of three distinct HIV-1 subtypes in Brazil based on the
protease gene.
DT 9410
AU Janini LM; Luo CC; Peralta M; Schecther M; Kalish ML; Pieniazek N; de la
Torre N; Schochetman G; Rayfield M; Pieniazek D; CDC, Atlanta, GA.
SO Abstr Gen Meet Am Soc Microbiol. 1994;94:482 (abstract no. T-1). Unique
Identifier : AIDSLINE ASM94/94313081
AB OBJECTIVE: To study genotypic differences in the protease gene from
HIV-1 infected persons in Brazil. METHODS: HIV-1 proviral DNA from 40
specimens were surveyed for genetic similarity to reference strains
using a PCR typing procedure based on the polymorphism of restriction
sites in the p24 gag region and in the protease gene. Twenty four of
these isolates were selected for protease gene sequencing. The sequence
data were used to infer phylogenetic relationship between isolates using
maximum likelihood and distance matrix methods. RESULTS: Three
genetically distinct subtypes were identified on the basis of their
protease gene sequences. Twenty one of the sequences were related to
those of the North American/European env subtype (B). The remaining 3
strains clustered into 2 distinct groups in the phylogenetic tree: one
sequence clustered with the African strains ELI and Z2Z6 (env subtype
D), whereas two other sequences clustered with strains in the env
subtype F group. CONCLUSIONS: Analysis of protease gene demonstrated the
existence of 3 distinct HIV-1 phylogenetic groups corresponding to env
subtypes B, D and F in the Brazilian population in contrast to the two
env subtypes (B and F) previously identified. Whether differences
between the grouping of some Brazilian strains, based on protease or
envelope gene regions, is a result of convergence in V3 region or a
recombination event merits further studies.
DE Brazil Comparative Study DNA, Viral/*ISOLATION & PURIF Genes, gag
*Genes, Viral Human HIV Protease/*GENETICS
HIV-1/*CLASSIFICATION/*GENETICS/ISOLATION & PURIF Phylogeny Polymerase
Chain Reaction/METHODS Polymorphism (Genetics) MEETING ABSTRACT
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).