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The Principles of Clinical Cytogenetics - Extra Materials - Springer

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Fluorescence In Situ Hybridization 485<br />

Fig. 22. Reverse FISH <strong>of</strong> a patient with an abnormal chromosome 8. G-banding (A) suggested a duplication<br />

<strong>of</strong> bands 8p23.1-p23.3. Two pairs <strong>of</strong> chromosomes 8 are shown; arrows indicate the additional<br />

band. This band was microdissected and the DNA was amplified, labeled, and used as a FISH probe.<br />

(B,C): hybridization to normal chromosomes. <strong>The</strong> same metaphase is imaged with reverse DAPI to<br />

approximate G-banding patterns and identify the two chromosomes 8 (B) and with typical DAPI staining<br />

(C). Arrows indicate both chromosomes 8. (D) Hybridization back to a metaphase from the patient, demonstrating<br />

that one chromosome 8 contains a duplication (arrow). <strong>The</strong> reverse FISH results confirm the<br />

initial interpretation. (G-Banded images courtesy <strong>of</strong> Lisa Plumley and Alma Ganezer; reverse FISH was<br />

performed by Dr. Jingwei Yu.)

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