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

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Table 3<br />

Summary of Control Experiments Required for DNA Detection by PRINS, in situ PCR, and ISH (Modified from ref. 9).<br />

Method Control experiment Purpose<br />

General Use of known positive and negative control samples Control for specificity and sensitivity<br />

as well as mixtures of these (cells) in different ratios<br />

Immunophenotpying the cell types of interest<br />

Control for specificity and sensitivity<br />

Solution-phase PCR on extracted DNA of sample under<br />

Control for sensitivity, false negative results and DNA quality<br />

study or directly on mildly fixed cell suspension<br />

Omission of primary antibody in immunohistochemical<br />

Control for background induced by endogenous enzyme activity<br />

detection (colorimetric detection) or nonspecific sticking of secondary<br />

and/or tertiary detection reagents to sample and/or glass slide<br />

Use of no, random, or irrelevant (labeled) primers/probes,<br />

Control for background induced by endogenous enzyme activity<br />

or vector sequences without a target-specific insert (colorimetric detection) or non-specific sticking of probe<br />

and/or detection reagents to sample and/or glass slide<br />

(Cycling) PRINS Omission of DNA polymerase Control for background induced by endogenous enzyme activity<br />

and (colorimetric detection) or nonspecific sticking of detection<br />

Direct in situ PCR reagents to sample and/or glass slide<br />

Omission of primers<br />

Control for artifacts related to endogenous priming, DNA repair<br />

and extension of nicks present in the DNA<br />

Indirect in situ PCR Omission of DNA polymerase Control for effect of amplification and sensitivity of ISH<br />

416 Speel, Ramaekers, and Hopman

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