Abstract
Microsatellite sequences are genome-wide dispersed stretches of short tandem nucleotide repeats. Because of their repetitive nature, microsatellites are prone to undergo shortening or extension during DNA replication because of polymerase slippage or misalignment of template strands (microsatellite instability, MSI). As spontaneous mutation rate increases dramatically in the presence of a defective mismatch repair (MMR) system, MSI represents an ideal phenotypic indicator of an MMR defect. MSI occurs in approximately 15% of colorectal cancers, including those arising in the Hereditary Non-Polyposis CRC familiar syndrome (HNPCC or Lynch Syndrome). MSI tumours feature a series of molecular and clinicopathological signatures that are distinct from non-MSI ones. MSI testing therefore enables identification of patients having a unique prognosis and a different response to particular drug therapies. This chapter provides three methodological approaches for assessing MSI in FFPE samples: a basic method involving amplification of the NCI-validated microsatellite marker sequences, with PAGE run and silver stain detection of PCR products; a multiplex PCR amplification of five mononucleotide markers alternative to the NCI panel, coupled with DHPLC (Denaturating High-Performance Liquid Chromatography) analysis of PCR products; and a multiplex PCR amplification of the five mononucleotide markers coupled with capillary electrophoresis.
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Notes
- 1.
The solubilization of proteinase K in 50% sterile glycerol avoids the freezing effect at −20°C, thus maintaining an optimal enzymatic activity.
- 2.
Clean the microtome with xylene. Cool the paraffin blocks at −20°C or on dry ice in aluminum foil to obtain thin sections.
- 3.
The number may vary, according to tissue type and area.
- 4.
Use some sections from a paraffin block without any tissue for the negative controls.
- 5.
When working with xylene, avoid breathing fumes; it is better to perform the deparaffinization step under a chemical hood.
- 6.
Discard the supernatant using a micropipette or a glass Pasteur pipette. Disposal of chemicals should be done in keeping with your laboratory safety rules.
- 7.
If low amounts of DNA are obtained, digestion can be prolonged up to 72 h by adding new Proteinase K solution every 24 h.
- 8.
Phenol and chloroform are toxic by inhalation; work under a chemical hood.
- 9.
The concentration of dsDNA expressed in μg/μL is obtained as follows: [DNA] = A260 x dilution factor x 50 x 10−3.
- 10.
The primer sequences for D2S123 and D13S153 have been modified with respect to those previously published, in order to reduce the length of the amplified product.
- 11.
It is recommended that a high-quality DNA, e.g. a DNA extracted from a cell line, be used.
- 12.
6× loading buffer: 0.25% bromophenol blue, 0.25% xylene cyanol, 30% glycerol in H2O.
- 13.
Ethidium bromide is a potentially carcinogenic compound. Always wear gloves. Used EtBr solutions must be collected in containers for chemical waste and discharged according to the local hazardous chemical disposal procedures.
- 14.
See Footnote 12.
- 15.
Toxic and carcinogenic. Avoid contact with eyes and skin. Avoid breathing fumes.
- 16.
The choice of amplification product volume (usually 1–5 μl) relies on band signal intensity at visual inspection of the agarose gel.
- 17.
As impedance may vary according to elecrophoretic system, buffer volume, etc., voltage and run time should be adapted.
- 18.
See Footnote 12.
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Glavač, D., Nardon, E. (2011). Microsatellite Instability (MSI) Detection in DNA from FFPE Tissues. In: Stanta, G. (eds) Guidelines for Molecular Analysis in Archive Tissues. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-17890-0_28
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DOI: https://doi.org/10.1007/978-3-642-17890-0_28
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