ACUTE LYMPHOCYTIC LEUKEMIA (ALL)

Vysis LSI TCF3/PBX1 Dual Color, Dual Fusion Translocation Probe

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Vysis LSI TCF3/ PBX1 Dual Color, Dual Fusion Translocation Probe hybridizes to chromosome 19p13.3 (TCF3 - Spectrum Green) and chromosome 1q23 (PBX1 - Spectrum Orange). The PBX1 probe is 635 kb in size and covers the entire PBX1 gene on chromosome 1q23. The TCF3 probe is 730 kb in size and the green probe extends beyond the TCF3 gene to cover a larger region on chromosome 19p13.3. 
 

The signals may also appear diffuse or split depending upon the condensation of the DNA and the relative distances between chromatids. The hybridized probe fluoresces with moderate to bright intensity both in interphase nuclei and on metaphase chromosomes. In interphase nuclei of normal cells, the probe generally appears as two distinct orange signals and two distinct green signals.

Normal Hybridization: Normal hybridization showing two orange and two green signals.

Abnormal Hybridization: Example abnormal hybridization showing two orange, one green and one fusion signals.