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Technical Advances |
From the Department of Clinical Immunology,*
Medical
Institute of Bioregulation, Kyushu University, Beppu, Oita, the Third
Department of Internal Medicine,
Faculty of
Medicine, Kyushu University, the Department of
Pathology,
School of Medicine, Fukuoka
University, and the Department of Hematology,§
National Kyushu Cancer Center Hospital, Fukuoka, Fukuoka, Japan
The remarkable diversity of the complementarity
determining region (CDR) 3 of the immunoglobulin (Ig) heavy (H) chain
gene rearrangements has been exploited to identify the clonal
populations of B cells in B cell malignancies. However, when B
cell malignancies of different categories were examined, the
overall detection rate was found to be approximately 70%. The
development of a simple clonality analysis using Ig light (L) chain
CDR3 diversity has been hampered due to the sparseness of knowledge
regarding the sequence of V
and V
gene segments and the
restriction of L chain CDR3 length. Based on the recently reported V
and V
gene sequences, we designed V
and V
framework 3
consensus primers. We combined the reverse transcriptase polymerase
chain reaction (RT-PCR) of IgL chain transcripts with a single-strand
conformation polymorphism (SSCP) analysis and then analyzed samples
from patients with B cell malignancies. Clonal B cell populations were
detected as discrete bands, and identical clones showed a
similar mobility in a RT-PCR SSCP analysis. This method was thus found
to be a useful supplement to the previously described approach of VH
gene amplification for detecting clonal B cell populations. By using
SSCP, we were able to determine the clonal identities of B cell
expansion in different samples.
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