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M94A2750.TXT
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1994-10-25
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Document 2750
DOCN M94A2750
TI Quantitation of HIV-1 proviruses in peripheral blood lymphocytes by
competitive nested PCR.
DT 9412
AU Hiraishi Y; Kato S; Asakawa M; Takano T; Department of Microbiology,
Keio University School of Medicine,; Tokyo, Japan.
SO Int Conf AIDS. 1994 Aug 7-12;10(1):233 (abstract no. PB0360). Unique
Identifier : AIDSLINE ICA10/94369825
AB OBJECTIVE: To optimize the conditions of the competitive nested PCR
assay which is highly sensitive for quantitation of HIV-1 DNA. METHODS:
The target sequence was within the nef gene. The competitor DNA was
produced by an internal deletion of the parental HIV-1 DNA. Competitor
DNA with a known copy number was co-amplified with 1 microgram of DNA
from peripheral blood lymphocytes of infected individuals by two
sequential PCR using different pairs of primers. The ratio between the
wild-type and competitor DNA products are determined by densitometric
analysis of DNA bands on agarose gel electrophoresis. RESULTS: To ensure
that the ratio between the wild-type and competitor DNA products be
equal to the ratio of these DNA before amplification, the preheating and
the polymerization steps had to be long enough. In the case of sample
DNA, the amounts of wild-type DNA products were often gradually
increased with the annealing temperature decreased, which was thought to
be an effect of mismatches between primers and target DNA. Such an
effect can be erased by using an annealing temperature at least 16
degrees C below Tm of the primers. DISCUSSION AND CONCLUSIONS:
Competitive nested PCR is useful for accurate quantitation of HIV-1
nucleic acids with no need of radioisotope.
DE Genes, nef/GENETICS Human HIV Infections/*MICROBIOLOGY
*HIV-1/GENETICS Lymphocytes/*MICROBIOLOGY Polymerase Chain
Reaction/*METHODS *Proviruses/GENETICS Viremia/*MICROBIOLOGY MEETING
ABSTRACT
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).