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The Principles of Clinical Cytogenetics - Extra Materials - Springer

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474 Daynna Wolff and Stuart Schwartz<br />

Fig. 12. FISH panels for B-cell disorders. (A) Results from a peripheral blood sample from a patient with CLL,<br />

hybridized with the Vysis CLL probe panel. Top row: A deletion <strong>of</strong> chromosome 13q was evident from the<br />

presence <strong>of</strong> two 13q34 control signals (green) and only one signal for the D13S319 probe (red). <strong>The</strong> ATM probe<br />

produced two signals, indicating no deletion. Bottom row: A normal signal pattern for TP53, and both normal and<br />

trisomy 12 cells revealed with a chromosome 12 centromere probe. B: A panel <strong>of</strong> probes hybridized to peripheral<br />

blood from a patient with plasma cell myeloma. An MLL break-apart probe produced two fusion signals, indicating<br />

no rearrangement involving this gene. An IGH break-apart probe, however, reveals both normal (bottom) and<br />

abnormal (top, arrow) cells in which a rearrangement involving IGH was evident by the separation <strong>of</strong> one red and<br />

one green signal. Subsequent analysis with probes for t(11;14)(q13.q32) demonstrated this rearrangement. A deletion<br />

<strong>of</strong> the RB-1 locus on chromosome 13 was also present, as is a deletion <strong>of</strong> the TP53 locus on 17p.

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