[Detection of bcl-2/IgH gene rearrangement in diffuse large B cell lymphoma by hemi-nested PCR].
OBJECTIVE
To explore a sensitive and specific method for detection of bcl-2/IgH gene rearrangement in diffuse large B cell lymphoma (DLBCL), and verify the credibility of the established method.


METHODS
bcl-2/IgH hemi-nested PCR primers were designed using the professional primer design software. Fifty-two samples of pathologically diagnosed DLBCL and 10 fresh tonsil tissues were amplified using hemi-nested touch down-PCR to detect bcl-2/IgH gene rearrangement. The PCR products were cloned and sequenced.


RESULTS
bcl-2/IgH gene rearrangement was detected in 6 of 52 DLBCL samples and 2 of 10 fresh tonsil tissues using one-way method. By using the hemi-nested PCR for the second round amplification, 5 of DLBCL were positive, but all of the fresh tonsil tissues were negative. The positive PCR products were sequenced and analyzed on the Internet, 3 of 8 cases obtained by one-way method were false positive, 5 positive cases amplified using hemi-nested PCR were all bcl-2/IgH gene rearrangement. PCR products of 3 false positive cases were homologous to BAC331191 and LLNLR-245D11 in human chromosome 19 and RP11-498P10 in chromosome 1.


CONCLUSIONS
There are false positive results using common primers for detecting bcl-2/IgH gene rearrangement. The mechanism may be that highly homologous sequences to human genome exist in commonly used primers. The specificity of the diagnosis could be improved by hemi-nested PCR using the combination of primers we designed and the traditional ones.
Department of Pathology, Nan Fang Hospital, Guangzhou 510515, China.
Hui-Yong
HY
Jiang
San-Quan
SQ
Zhang
Xi-Qun
XQ
Han
Lan-Ying
LY
Song
Mei-Gang
MG
Zhu
Tong
T
Zhao
D015326:Gene Rearrangement, B-Lymphocyte, Heavy Chain; D019254:Genes, bcl-2 / Q000235:genetics*; D006801:Humans; D016403:Lymphoma, Large B-Cell, Diffuse / Q000235:genetics*; D016133:Polymerase Chain Reaction / Q000379:methods*