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John M. S. Bartlett.pdf - Bio-Nica.info

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306 Edwards and <strong>Bartlett</strong><br />

Fig. 1. Example of a gel image.<br />

the tumor cell content after microdissection is assessed to be greater than 70% and inter<br />

assay variations of the detection system is below 5%. An example of LOH detection<br />

using the Geneotype ® Software can be seen in Fig. 2.<br />

A locus is described as unstable if a novel peak is present or if a peak has undergone<br />

a size shift after PCR amplification of tumor DNA compared with PCR amplification<br />

of paired normal DNA. A tumor is described as exhibiting MIS if at least 40% of the<br />

loci investigated are found to be unstable.<br />

4. Notes<br />

1. Inactivation of proteinase K is a very important step because failure to inactivate proteinase<br />

K will cause PCR to fail, with the proteinase K destroying the Taq polymerase.<br />

2. When analyzing Genotyper data, more than one peak may be present for each allele<br />

because of polymerase artifact stutter bands. It is therefore difficult to decide the size<br />

and the height of the peak to include in the calculation. In general, however, the sizes

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