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

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AU-Differential Display 231<br />

Fig. 3. Typical AU-DD gel. Results from adherent monocytes by using a single PCR (not<br />

nested) are shown. Lanes 1 and 2 show fingerprints from activated cells. Lanes 3 and 4 show<br />

resting cells. Net cDNA was used for lanes 1 and 3 and diluted (15) for 2 and 4. Arrows signal<br />

fragments from differentially expressed genes.<br />

3.3. AU-DD<br />

At this stage, there are two desalted cDNA samples ready to be compared, the<br />

experimental and the control. Every reaction on a template is made in duplicate to<br />

detect variability caused by the sample concentration only. In this way, two cDNA<br />

concentrations, net and 15, are used in independent PCR tubes with otherwise identical<br />

primer and conditions (see Note 13). Reactions are prepared for 10-µL volumes and<br />

contain 2 µL of cDNA, primer at 3 µM (1.5 µM in nested reactions as proposed in<br />

Note 13), 10 mM Tris-HCl, pH 8.8; 1.5 mM MgCl 2 , 50 mM KCl, 0.1% Triton X-100,<br />

dNTPs each at 0.2 mM (see Note 14), 0.25 µL of α- 32 P-dATP and 50 mU/µL Platinum<br />

DNA polymerase (see Note 15). Reactions are run in a PTC-100 thermocycler (MJ<br />

Research) for 40 cycles with the following profile: 94°C for 40 s; 42°C for 1 min,<br />

20 s; and 70°C for 40 s.

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