XL Iso(17q)

Amplification/Deletion Probe

Order Number
Package Size
100 µl (10 Tests)


XL Iso(17q)

The XL Iso(17q) is a combination of locus-specific DNA probes for the TP53 region at 17p13 in green and the MPO region located at 17q22 in orange.

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Clinical Details

An isochromosome of the long arm of chromosome 17, i(17q), is the most frequent genetic abnormality observed during the disease progression of Philadelphia chromosome positive chronic myeloid leukemia (CML). The breakpoints are located in the short arm of chromosome 17 within the Smith-Magenis critical region at 17p11. In neuroblastoma and other hematologic malignancies, amplification of 17q is a significant predictive factor for adverse outcome.

Isochromosome 17q, or i(17q), is ocurring in primitive neuroectodermal tumor/medulloblastoma (50 %), chronic myeloid leukemia (CML), acute myeloid leukemia (AML), and myelodysplastic syndrome (MDS).

Clinical Applications

  • Chronic Myelogenous Leukemia (CML)
  • Myelodysplastic Syndrome (MDS)
  • Acute Lymphoblastic Leukemia (ALL)
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XL Iso(17q)

XL Iso(17q) 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 result):
One green (1G) and three orange (3O) signals, indicating the presence of i(17q).

Expected Pattern 3

Aberrant Cell (typical results):
Two green (2G) and three orange (3O) signals, indicating a gain of 17q.

Expected Pattern 4

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

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  • Fioretos et al (1999) Blood 94:225-232
  • Barbouti et al (2004) Am J Hum Genet 74:1 - 10
  • Carvalho et al (2008) Genome Res 18:1724-1732