Deletion Probe

Order Number
Package Size
100 µl (10 Tests)



XL TP53/NF1 consists of an orange-labeled probe hybridizing to the TP53 gene region at 17p13 and a green-labeled probe hybridizing to the NF1 gene region at 17q11.2.

Probe maps are created in accordance with the intended purpose of the product. Solid colored bars do not necessarily indicate that the probe fully covers the indicated genomic region. Therefore, caution is advised when interpreting results generated through off-label use. Probe map details based on UCSC Genome Browser GRCh37/hg19. Map components not to scale. Further information is available on request.

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Clinical Details

TP53 is a tumor suppressor gene often described as the guardian of the genome. Deletions and/or mutations can be detected in a wide range of hematological neoplasms and are the most common genetic aberrations in human cancer. The neurofibromin 1 gene (NF1), located at 17q11.2, is a tumor suppressor gene negatively regulating the RAS signal transduction pathway. Germline-loss of function can cause neurofibromatosis type I, a congenital genetic disorder of the nervous system which usually appears during childhood. Somatic deletions of NF1 are detected in about 3.5-7% of de novo acute myeloid leukemia (AML) cases and are often associated with a complex aberrant karyotype. Mutations in the remaining NF1 allele are reported with varying frequency. NF1 deleted cells have a decreased sensitivity to Ara-C in cell culture studies.
FISH is a valuable tool for the detection of NF1 deletions which might be easily overlooked by conventional cytogenetics due to the small size of the aberration.

Clinical Applications

  • Acute Myelogenous Leukemia (AML)
  • Chronic Myelogenous Leukemia (CML)
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XL TP53/NF1 hybridized to lymphocytes. One normal metaphase is shown.

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Expected Patterns

Expected Pattern 1

Normal Cell:
Two green (2G) and two orange (2O) signals.

Expected Pattern 2

Aberrant Cell (typical results):
One orange (1O), two green (2G) signals, indicating a deletion of TP53.

Expected Pattern 3

Aberrant Cell (typical results):
One green (1G) and one orange (1O) signal indicating the deletion of the TP53 and NF1 locus.

Expected Pattern 4

Aberrant Cell (typical results):
One orange (1O) and three green (3G) signals, indicating the presence of an isochromosome (17).

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  • Haferlach et al (2012) Leukemia 26:834-839
  • Boudry-Labis et al (2013) Am J Hematol 88:306-311
  • Tessoulin et al (2017) Blood Rev:doi:org/10.1016/j.blre.2017.03.001