Abstract:
OBJECTIVE:The mutational status of the immunoglobulin (Ig) V(H) gene in B-cell chronic lymphocytic leukaemia (B-CLL) identifies two subgroups of patients with significantly different outcomes. We investigated the association of ZAP-70 expression with IgVH mutational status in B-CLL by quantifying ZAP-70 mRNA, to evaluate its use as a surrogate marker for mutational status. The aim of this study was to develop a quantitative reverse transcriptase-polymerase chain reaction (RQ-PCR) assay for the detection of ZAP-70 expression in a group of patients whose mutational status and cytogenetics had been determined previously. METHODS:RQ-PCR was used to analyse ZAP-70 expression from 42 B-CLL patients. B cells were purified using CD19 magnetic bead system and total RNA was isolated. RQ-PCR was performed using Taqman PCR. RESULTS:Twenty-five patients (60%) had mutated and 17 (40%) had unmutated IgVH genes; 94% (16/17) of patients with unmutated IgVH gene were ZAP-70 positive as assessed by RQ-PCR and 92% (23/25) of patients with mutated IgVH gene were ZAP-70 negative. In three patients, ZAP-70 expression and IgVH mutational status were discordant. CONCLUSION:This paper describes an RQ-PCR assay for the detection of ZAP-70 expression and confirms that IgV(H) unmutated CLL cells have a high expression of ZAP-70 in comparison with IgVH mutated CLL. This robust method acts as a surrogate marker for IgVH mutational status albeit with <100% concordance. However, it does provide better concordance with mutational status than that reported using flow cytometry.
journal_name
Eur J Haematoljournal_title
European journal of haematologyauthors
Catherwood MA,Matthews C,Niblock R,Dobbin E,Morris TC,Alexander HDdoi
10.1111/j.1600-0609.2005.00619.xsubject
Has Abstractpub_date
2006-04-01 00:00:00pages
294-8issue
4eissn
0902-4441issn
1600-0609pii
EJH619journal_volume
76pub_type
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