The XL 21q22/XCP 21 is a combination of a whole chromosome paint 21 in green with an orange labeled locus-specific probe for 21q22. This probe allows analysis of copy numbers and structural aberrations of chromosome 21 on metaphase chromosomes.

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.

This probe is not intended for use in analysis of trisomy 21 in prenatal diagnosis.

XL 21q22/XCP 21 hybridized to normal human metaphase spreads will result in green signals along the entire length of chromosome 21 combined with orange signals at 21q22 (Down Syndrome Critical Region 4).
A translocation with involvement of chromosome 21 will result in a split of a green signal. In this case, the green signal will be partially visible on the der(21) and the respective partner chromosome of the translocation. Depending on the localization of the breakpoint on the der(21), the signal of the locus-specific probe remains on the der(21) or will be observed on the translocation partner.

XL 21q22/XCP21 was hybridized to normal lymphocytes. A metaphase with chromosomes 21 painted in green and orange signals at 21q22 is shown.

• Utility and performance of bacterial artificial chromosomes-on-beads assays in chromosome analysis of clinical prenatal samples, products of conception and blood samples.
• A child with multiple congenital anomalies due to partial trisomy 7q22.1 → qter resulting from a maternally inherited balanced translocation: a case report and review of literature.
• Distinct roles of ATM and ATR in the regulation of ARP8 phosphorylation to prevent chromosome translocations.
• Heterogeneous MYCN amplification in neuroblastoma: a SIOP Europe Neuroblastoma Study.
• Immense random colocalization, revealed by automated high content image cytometry, seriously questions FISH as gold standard for detecting EML4-ALK fusion.
• Fluorescence in situ hybridisation assays designed for del(7q) detection uncover more complex rearrangements in myeloid leukaemia cell lines
• Detection of t(7;12)(q36;p13) in paediatric leukaemia using dual colour fluorescence in situ hybridisation.
• A rare case of t(11;22) in a mantle cell lymphoma like B-cell neoplasiaresulting in a fusion of IGL and CCND1: case report.
• Genomic DNA-chip hybridization in t(11;14)-positive mantle cell lymphomas shows a high frequency of aberrations and allows a refined characterization of consensus regions.