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Detecting mismatch repair defects in myeloma
Mark Velangi1, Elizabeth Matheson, Andrew Hall
1Northern Institute for Cancer Research, ?Medical School, Newcastle upon Tyne, UK.
Methods in Molecular Medicine
|June 22, 2005
Summary
Microsatellite instability, a hallmark of DNA mismatch repair defects, can be assessed in myeloma. This study details a method using CD138-purified plasma cells and PCR to detect instability in tumor DNA.
Area of Science:
- Genetics
- Molecular Biology
- Oncology
Background:
- Defects in the DNA mismatch repair system are linked to a microsatellite unstable phenotype.
- Microsatellite instability is a known characteristic in certain cancers, including myeloma.
Purpose of the Study:
- To describe the preparation of purified plasma cells for tumor DNA extraction.
- To present a sensitive method for assessing microsatellite instability in myeloma DNA.
Main Methods:
- Purification of plasma cells using CD138 magnetic microbeads.
- Comparison of microsatellite repeat units in tumor DNA versus constitutive DNA.
- Utilizing polymerase chain reaction (PCR) and laser scanning of fluorescently labeled amplicons for analysis.
Main Results:
- A robust and sensitive method for microsatellite instability assessment in myeloma was established.
- The method allows for the comparison of microsatellite repeat units between tumor and normal DNA.
Conclusions:
- The described method enables reliable detection of microsatellite instability in myeloma.
- This technique aids in understanding the role of DNA mismatch repair defects in myeloma development and progression.