双色双融合与额外信号探针在BCR/ABL融合基因检测中的比较及其意义

目的 探讨DCCF(dual color dual fusion)探针与ES(extra signal)探针在BCR/ABL融合基因检测中信号表现的特点,并明确其信号特征与染色体核型的相互关系.方法 对初治65例慢性粒细胞白血病(chronic myelocytic leukemia,CML)及50例急性淋巴细胞白血病(acute lymphoblastic leukemia,ALL)患者骨髓标本进行BCR/ABL的DCDF探针的荧光原位杂交(fluorescence in situ hybridization,FISH)检测,FISH阳性标本则使用ES探针再次进行荧光原位杂交进行BCR断裂点的检测,同时对其中47例CML和40例ALL进行了核型分析.结果 FISH结果示65例CML均为BCR/ABL阳性,DCDFFISH中有17例为非典型信号表现,ES-FISH有12例为非典型信号表现;50例ALL中7例BCR/ABL阳性,ES探针显示5例BCR断裂点位于m-bcr,2例位于M-bcr.核型分析CML检出Ph阳性98%(43/44),ALL检出Ph阳性22%(7/32).结论 DCDF-FISH、ES-FISH以及核型分析各有其特性.根据每种方法的特性,对实验结果进行综合分析可对遗传学特征作出更准确判断.

Abstract：

Objective To investigate the signal patterns of dual color dual fusion (DCDF) probe and extra signal (ES) probe in the detection of BCR/ABL fusion gene, and illustrate the relation between the fluorescence in situ hybridization (FISH) pattern and the karyotype. Methods Sixty-five cases of chronic myelocytic leukemia(CML) and 50 cases of acute lymphoblastic leukemia (ALL) were detected by FISH with DCDF probe, the BCR/ABL positive samples were detected by FISH with ES probe. Among these cases, 47 cases of CML and 40 cases of ALL perform conventional cytogenetics simultaneously. Results All 65 cases of CML were all BCR/ABL positive by FISH. 17 cases showed the atypical pattern by DCDFFISH, and 12 cases showed the atypical pattern by ES-FISH. There were 7 cases of BCR/ABL positive in 50 cases of ALL by FISH. By ES-FISH, there were 5 cases in which the break-point of BCR gene was located in m-bcr, 2 cases in which the break-point of BCR gene was located in M-bcr. Conventional cytogenetics demonstrated that 43/44(98 %) cases of CML and 7/32(22 %) cases of ALL were Ph positive.Conclusion The features of DCDF-FISH, ES-FISH and conventional eytogenetic are different from each other. According to the features of these method, it can increase the precision of the adjustment of genetic feature to analyze these results comprehensively.

Comparison and significance of DCDF probe and ES probe in the detection of BCR/ABL fusion gene

Objective To investigate the signal patterns of dual color dual fusion (DCDF) probe and extra signal (ES) probe in the detection of BCR/ABL fusion gene, and illustrate the relation between the fluorescence in situ hybridization (FISH) pattern and the karyotype. Methods Sixty-five cases of chronic myelocytic leukemia(CML) and 50 cases of acute lymphoblastic leukemia (ALL) were detected by FISH with DCDF probe, the BCR/ABL positive samples were detected by FISH with ES probe. Among these cases, 47 cases of CML and 40 cases of ALL perform conventional cytogenetics simultaneously. Results All 65 cases of CML were all BCR/ABL positive by FISH. 17 cases showed the atypical pattern by DCDFFISH, and 12 cases showed the atypical pattern by ES-FISH. There were 7 cases of BCR/ABL positive in 50 cases of ALL by FISH. By ES-FISH, there were 5 cases in which the break-point of BCR gene was located in m-bcr, 2 cases in which the break-point of BCR gene was located in M-bcr. Conventional cytogenetics demonstrated that 43/44(98 %) cases of CML and 7/32(22 %) cases of ALL were Ph positive.Conclusion The features of DCDF-FISH, ES-FISH and conventional eytogenetic are different from each other. According to the features of these method, it can increase the precision of the adjustment of genetic feature to analyze these results comprehensively.