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Cytogenetics on released DNA fibers
J W Vaandrager1, J K Kleiverda, E Schuuring
1Dept. of Pathology, Leiden University Medical Center, The Netherlands.
Verhandlungen Der Deutschen Gesellschaft Fur Pathologie
|January 1, 1997
Summary
DNA fiber Fluorescence In Situ Hybridization (FISH) creates color barcodes to detect DNA rearrangements with high sensitivity. This method effectively maps structural DNA alterations, including translocations in mantle cell lymphoma and immunoglobulin class switching in hairy cell leukemia.
Area of Science:
- Molecular Biology
- Genetics
- Cytogenetics
Background:
- DNA fiber Fluorescence In Situ Hybridization (FISH) enables detailed analysis of DNA segments.
- Hybridization with multiple probes creates unique color barcodes for DNA segments.
Purpose of the Study:
- To evaluate DNA fiber FISH for detecting and mapping structural DNA alterations.
- To apply DNA fiber FISH in diagnosing specific hematological malignancies.
Main Methods:
- Releasing DNA fibers from cell suspensions and frozen tissues.
- Performing simultaneous hybridization with 5-10 differently labeled probes to generate color barcodes.
- Analyzing DNA fiber FISH for sensitivity and resolution (2-500kb).
Main Results:
- Detected t(11;14) translocation in 35 of 36 mantle cell lymphoma (MCL) cases, identifying complex rearrangements in 5 cases.
- Revealed concordant immunoglobulin class switch deletions in 13 hairy cell leukemia (HCL) cases, affecting both alleles in most instances.
- Demonstrated a sensitivity of approximately 10% in mixing experiments.
Conclusions:
- DNA fiber FISH is a powerful tool for detecting and mapping structural DNA alterations.
- The method shows high specificity and sensitivity for diagnosing genetic abnormalities in hematological cancers.
- DNA fiber FISH aids in understanding complex genomic rearrangements and immunoglobulin class switching.