Break Apart Probe

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Package Size
100 µl (10 Tests)



The XL ETV6 is designed as a break apart probe. Its orange labeled part hybridizes proximal to the ETV6 (TEL) gene at 12p13; the green labeled probe hybridizes to the distal ETV6 region.

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Clinical Details

The ETV6 gene, located on 12p13.2, is involved in numerous translocations found in myeloid and lymphoid malignancies. Two mechanisms are common, fusion to a tyrosine kinase resulting in a constitutively active tyrosine kinase and fusions to transcription factors driving aberrant expression of target genes. The frequent translocation t(12;21)(p13;q22) results in the formation of the chimeric transcription factor ETV6-RUNX1 which can be identified in about 25% of childhood B-ALL cases. ETV6-RUNX1 causes expansion of B-cell precursors with impaired ability of differentiation to mature B-cells. Another important aberration is t(5;12)(q33;p13), found in chronic myelomonocytic leukemia and myeloproliferative diseases, resulting in the fusion of ETV6 with the receptor tyrosine kinase PDGFRB. The resulting oncogene is sensitive to the kinase inhibitor imatinib. t(7;12)(q36;p13) can be identified in pediatric AML and ALL and is resulting in the fusion gene MNX1-ETV6.

Besides hematological malignancies, ETV6 is also involved in the development of the pediatric congenital mesoblastic nephroma and fibrosarcoma. t(12;15)(p13;q25) fuses ETV6 to the tyrosin receptor kinase NTRK3 resulting in the ETV6-NTRK3 fusion gene, a constitutively active tyrosine kinase.

Clinical Applications

  • Acute Lymphoblastic Leukemia (ALL)
  • Acute Myelogenous Leukemia (AML)
  • Chronic Myelogenous Leukemia and Myeloproliferative Neoplasms (CML/MPN)
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XL ETV6 hybridized to lymphocytes. One normal interphase and metaphase are shown.

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Expected Patterns

Expected Pattern 1

Normal Cell:
Two green-orange (2GO) fusion signals representing the two normal ETV6 loci.

Expected Pattern 2

Aberrant Cell (typical results):
One green (1G), one orange (1O), and one green-orange (1GO) fusion signal, indicating a chromosome break in the ETV6 locus.

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  • Lierman and Cools (2007) Haematologica 92:145-147
  • Adem et al (2001) Mod Pathol 14:1246-1251
  • Naiel et al (2013) Cancers 5:281-295