Hybridization protection assay: a rapid, sensitive, and specific method for detection of Philadelphia chromosome-positive leukemias.

Abstract:

:The Philadelphia (Ph1) chromosome is present in greater than 90% of patients with chronic myelogenous leukemia (CML) and in 2% to 20% of those with acute leukemias, for which it is an important prognostic marker too. The chimeric BCR-ABL mRNAs resulting from the translocation encode either a 210-Kd or a 190-Kd protein. The techniques used to detect Ph1 chromosome include karyotyping, Southern analysis to demonstrate bcr rearrangement, and polymerase chain reaction to amplify the BCR-ABL transcripts. However, the routine performance of these methods by clinical laboratories is cumbersome, time consuming, and exposes laboratory personnel to radioisotopes. We describe here the clinical application of a new method, the hybridization protection assay (HPA), which uses chemiluminescent acridinium-ester-labeled probes in conjunction with PCR for detection of the amplified BCR-ABL sequences. The method is sensitive, specific, and can reliably distinguish between the transcripts for P190BCR-ABL and P210BCR-ABL. In contrast to the 2 days or longer required for conventional hybridization, HPA analysis can be completed in less than 30 minutes. We have successfully used this method to analyze 60 leukemia samples (34 from Ph1-negative acute leukemias; 6 from Ph1-positive acute leukemias; and 20 from CML) with complete correlation (of BCR-ABL positivity or negativity) with the results of karyotype or Southern Blot analysis of genomic DNA for bcr rearrangement. Therefore, the HPA, in conjunction with PCR, appears to provide a rapid and reliable test for the diagnosis of Ph1-positivity.

journal_name

Blood

journal_title

Blood

authors

Dhingra K,Talpaz M,Riggs MG,Eastman PS,Zipf T,Ku S,Kurzrock R

subject

Has Abstract

pub_date

1991-01-15 00:00:00

pages

238-42

issue

2

eissn

0006-4971

issn

1528-0020

journal_volume

77

pub_type

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