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M9480858.TXT
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1994-09-05
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Document 0858
DOCN M9480858
TI Sensitivity and application of a new method for isolating purified
compartmentalized HIV-1 unintegrated and integrated DNA.
DT 9410
AU Bush CE; Golembieski A; Donovan RM; Baxa D; Markowitz N; Saravolatz LD;
Henry Ford Hospital, Detroit, MI.
SO Abstr Gen Meet Am Soc Microbiol. 1994;94:483 (abstract no. T-4). Unique
Identifier : AIDSLINE ASM94/94313087
AB Measurement of the relative amounts of HIV unintegrated DNA (uDNA) and
integrated DNA (iDNA) is a promising marker of therapeutic efficacy. The
Hirt procedure for isolating total uDNA requires multiple extractions
leading to DNA loss. We developed a novel column-based method for the
isolation of cytoplasmic and nuclear uDNA fractions and the proviral
iDNA from HIV-1. Aliquots of counted peripheral blood mononuclear cells
(PBMCs) from 10 patients on antiretrovirals with CD4 counts > 200 were
processed using the column or Hirt methods. The column method
resuspended PBMCs in lysis buffer with the cytoplasmic fraction purified
by centrifugation and ion exchange chromatography. The nuclear uDNA
fraction was purified by base and detergent lysis followed by
centrifugation and chromatography. The Hirt procedure lysed PBMCs with
SDS and iDNA was separated from uDNA by high salt and centrifugation.
The two fractions were digested and extracted multiple times. The amount
of iDNA from both methods was quantified by measuring the OD260. The
amount of HIV DNA in the uDNA and iDNA fractions was determined using
quantitative PCR. The uDNA fractions were tested for iDNA contamination
by RAS specific PCR. The nuclear uDNA fraction was tested for
cytoplasmic uDNA contamination using mitochondrial DNA specific PCR. All
10 of the patients had uDNA in both fractions. Seven of the patients had
more uDNA in the nuclear fraction than the cytoplasmic fraction, 2 had
about the same amount and 1 had more in the cytoplasm. There was an
average of 10% uDNA in the cytoplasm and 26% in the nucleus. Two of the
patients had recently switched antiretroviral therapy and their total
uDNA levels dropped from 45% to 16% and 17% to 7%, respectively, after 4
weeks on new therapy. The new method was found to recover approximately
50 X more u/iDNA than the Hirt procedure. This new method has proven to
be rapid, reliable and directly PCR compatible. We are using it to
characterize the uDNA in the separated fractions and to monitor copy
number changes in patients as therapy starts or changes.
DE Acquired Immunodeficiency Syndrome/*DRUG THERAPY/IMMUNOLOGY/
MICROBIOLOGY Cell Nucleus/MICROBIOLOGY Cytoplasm/MICROBIOLOGY DNA,
Viral/ANALYSIS/*BLOOD/GENETICS Human HIV-1/GENETICS/*ISOLATION & PURIF
Lymphocytes/IMMUNOLOGY/*MICROBIOLOGY Polymerase Chain Reaction/*METHODS
Sensitivity and Specificity T4 Lymphocytes/IMMUNOLOGY *Virus
Integration MEETING ABSTRACT
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).