Skip to Content

Are you based in North America? If yes, switch to our North American website →

E2A/PBX1 Plus Translocation, Dual Fusion Probe

Catalogue Numbers
LPH 080-S (5 tests)
LPH 080 (10 tests)

Probe Specification

  • E2A, 19p13.3, Green
  • PBX1, 1q23.3, Red
  • HLF, 17q22, Blue

The E2A probe, labelled in green, contains two probes (110kb and 146kb) that cover the 3’ end of the E2A (TCF3) gene and flanking region and a 321kb probe that covers a region 5’ (centromeric) to the gene. The PBX1 probe, labelled in red, contains two probes (147kb and 110kb) that map within the PBX1 gene and a 117kb probe that maps 3’ (telomeric) to the gene. The HLF probe, labelled in blue, consists of a 482kb probe 5’ (centromeric) to HLF and two probes (323kb and 166kb) that are 3’ of the gene.

Probe Information

The TCF3 (transcription factor 3) gene is located at 19p13.3, PBX1 (pre-B-cell leukemia homeobox 1) gene is located at 1q23.3 and HLF (hepatic leukemia factor) at 17q22.

Translocations involving TCF3 are some of the most common rearrangements in childhood B-cell acute lymphoblastic leukaemia (ALL)1,2.

PBX1 and HLF become fused to TCF3 as a result of the t(1;19)(q23;p13) and t(17;19)(q22;p13) translocations, forming the TCF3-PBX1 and TCF3-HLF fusion genes, respectively. A rare cryptic inversion, inv(19)(p13;q13), has been reported to fuse TCF3 to TFPT (TCF3[E2A] fusion partner [in childhood leukaemia]), resulting in the TCF3-TFPT fusion gene1.

Not only do Cytocell offer an extensive range of high-quality FISH probes, the customer support is also excellent — providing fast access to all the probes I need. The probes are highly consistent with bright signals allowing easy scoring of results. Dr Eric Crawford, Senior Director, Genetics Associates Inc.


  1. Van der Burg et al., Leukemia 2004;18(5):895-908
  2. Swerdlow et al., (eds,) WHO Classification of Tumours of Haematopoietic and Lymphoid Tissue, Lyon, France, 4th edition, IARC,2017
  3. Arsham, MS., Barch, MJ. and Lawce HJ. (eds.) (2017) The AGT Cytogenetics Laboratory Manual. New Jersey: John Wiley & Sons Inc.
  4. Mascarello JT, Hirsch B, Kearney HM, et al. Section E9 of the American College of Medical Genetics technical standards and guidelines: fluorescence in situ hybridization. Genet Med. 2011;13(7):667-675.
  5. Wiktor AE, Dyke DLV, Stupca PJ, Ketterling RP, Thorland EC, Shearer BM, Fink SR, Stockero KJ, Majorowicz JR, Dewald GW. Preclinical validation of fluorescence in situ hybridization assays for clinical practice. Genetics in Medicine. 2006;8(1):16–23.

Microscope Images

E2A PBX1 HLF Translocation Dual Fusion magnified
Area of Interest*


This product is intended to be used on Carnoy’s solution (3:1 methanol/acetic acid) fixed haematological samples.

*Disease information supported by the literature and is not a reflection of the intended purpose of this product.