Deletion Probe

Order Number
Package Size
100 µl (10 Tests)



The XL DLEU/LAMP probe detects deletions on chromosome 13q. The orange labeled probe hybridizes to the DLEU locus region at 13q14.2, including D13S319 and the green probe hybridizes to the LAMP locus at 13q34.

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Clinical Details

The prognosis and clinical course of CLL are heterogeneous. Conventional banding techniques in CLL are hampered by the low mitotic index of the neoplastic cells. The introduction of interphase cytogenetics using fluorescent in situ hybridization (FISH) has greatly increased the sensitivity of cytogenetic analyses. With FISH abnormalities can be detected in more than 80 % of patients by using a 4-probe panel for the detection of trisomy 12q13-15 and deletions 13q14, 17p13 and 11q22-23. An additional 10 % of patients can be shown to carry a 6q21 deletion, 14q32 translocation, and partial trisomy 3q or 8q.

The most frequently deleted region in B-CLL is located in 13q14.3 distal to RB1. The minimal deleted region (MDR) is 350 kb in size and includes the gene loci for the mi-RNAs 15 and 16. CLL with 13q deletion as the sole cytogenetic abnormality usually have a good prognosis.

Deletions of chromosomal region 13q14 have also been reported in a variety of human tumors, including other types of lymphoid tumors and myeloid leukemias, as well as prostate, head and neck, and non-small-cell lung cancers.

Clinical Applications

  • Multiple Myeloma and Plasma Cell Neoplasms (MM)
  • Acute Myelogenous Leukemia (AML)
  • Chronic Lymphocytic Leukemia (CLL)
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XL DLEU/LAMP hybridized to lymphocytes. One normal interphase and metaphase are 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):
Two green (2G) and one orange (1O) signal, indicating the deletion of a 13q14.3 locus.

Expected Pattern 3

Aberrant Cell (typical results): One green (1G) and two orange (2O) signals, indicating a deletion of the terminal region of the long arm of chromosome 13.

Expected Pattern 4

Aberrant Cell (typical results): One green (1G) and one orange (1O) signal, indicating deletions of both loci in 13q14 and 13qter.

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  • Doehner et al (2000) N Engl J Med 343:1910-1916
  • Calin et al (2002) Proc Natl Acad Sci USA 99:15524-15529
  • Gunn at al (2008) J Mol Diagn 10:442-451