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

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PCR Fluorescence Differential Display 237<br />

37<br />

PCR Fluorescence Differential Display<br />

Kostya Khalturin, Sergej Kuznetsov, and Thomas C. G. Bosch<br />

1. Introduction<br />

Differential display of mRNA via polymerase chain reaction (DD-PCR) has become<br />

a powerful procedure for the quantitative detection of differentially expressed genes<br />

in distinct cell populations (1–4).<br />

The standard procedure includes selective reverse transcription of polyadenylated<br />

RNA using specific anchored oligo(dT) primers, PCR amplification of cDNA using<br />

the oligo(dT) primer and an arbitrary upstream primer, resolution of PCR products on<br />

denaturing sequencing gels, and radioactive detection methods. To avoid hazardous<br />

radioisotopes, several nonradioactive methods for identification of differential display<br />

cDNAs have been reported, including ethidium bromide visualization in agarose gels<br />

(5), silver staining (6,7) and chemiluminescent detection (8,9) of cDNA bands.<br />

Several protocols have been published reporting the use of automated DNA sequencers<br />

for differential display of cDNAs labeled with infrared dyes (10) or fluorescent<br />

tags (11–13). A major drawback for using automated sequencers for this purpose<br />

is the inability to recover the amplified cDNAs from the gel. As an alternative, the<br />

programmable GenomyxLR DNA sequencer (Genomyx, Foster City, CA), which<br />

allows high resolution of cDNAs and easy localization and excision of radiolabeled<br />

bands from the gel, is becoming widely used in differential display studies (3).<br />

For nonradioactive detection of differential cDNA bands on the GenomyxLR DNA<br />

sequencer, cDNAs can be fluorescently labeled by using tetramethylrhodamine<br />

(TAMRA)-anchored primers. Alternatively, cDNAs can be fluorescently labeled<br />

by using TAMRA-dUTP (Perkin–Elmer), which is incorporated into extending<br />

cDNA during the PCR (14). Fluorescently labeled PCR products are separated on a<br />

GenomyxLR DNA sequencer (Genomyx), detected by the GenomyxSC Fluorescent<br />

Imaging Scanner, and directly excised from the gel for further characterization using an<br />

actual and virtual grid system. The flowchart shown in Fig. 1 outlines the experimental<br />

procedure.<br />

2. Materials<br />

1. peqGold RNAPure kit (PEQLAB <strong>Bio</strong>technologie GmbH, Germany) or other reagents<br />

for total RNA/mRNA extraction.<br />

2. DEPC water.<br />

From: Methods in Molecular <strong>Bio</strong>logy, Vol. 226: PCR Protocols, Second Edition<br />

Edited by: J. M. S. <strong>Bartlett</strong> and D. Stirling © Humana Press Inc., Totowa, NJ<br />

237

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