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CRLF2 Breakapart

Catalogue Numbers
RU-LPH 085 (100μl)
RU-LPH 085-S (50μl)

Overexpression of Cytokine Receptor-Like Factor 2 (CRLF2) has been shown to occur in Acute Lymphoblastic Leukaemia (ALL), particularly that associated with Down Syndrome (DS-ALL)1,2.

Overexpression of this protein has been associated with activation of the JAK/STAT5 pathway in transduced primary B-cell progenitors1,3 and various groups have attempted to characterise the biochemical consequences of these genetic lesions, with the goal of identifying targets for new therapies2,3.

CRLF2 overexpression has been shown to be caused by chromosomal rearrangements including the t(X;14) or t(Y;14) translocations or interstitial deletions of the pseudoautosomal region 1 (PAR1) of chromosomes X and Y. These place CRLF2 under control of an IGH enhancer1 or juxtapose the first non-coding exon of P2RY8 to the coding region of CRLF22, respectively. All of these CRLF2 rearrangements are cytogenetically cryptic and cannot be detected by conventional G-banded analysis1, making FISH a powerful detection tool for these abnormalities and an aid to furthering this research. Our CRLF2 Breakapart probe will detect rearrangements of the CRLF2 gene, whilst the P2RY8 Deletion probe allows detection of deletions between CRLF2 and P2RY8, causing the fusion gene.

I first came across Cytocell FISH probes in a previous lab I worked in and I was struck by the quality of the products. Since this time, I have been recommending and introducing Cytocell probes across all application areas — now they are the primary FISH probes used in our lab. They have an excellent range of products and their ready-to-use reagent format saves considerable time. As a matter of fact, at a recent conference there was a discussion about the lack of commercial probes for a particular disorder and I was happy to point the participants in the direction of the Cytocell catalogue, which contains the exact probes required. Elizabeth Benner, Medical Technologist at the University of Arizona Health Network 


1. Russell et al., Blood. 2009 Sep 24;114(13)2688-98

2. Mullighan et al., Nat Genet 2009; 41(11): 1243-6

3. Tasian et al., Blood 2012; 120(4):833-842

Microscope Images

CRLF2 magnified v3
Area of Interest*


For research use only, not for use in diagnostic procedures.

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