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

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Arrays for Genotyping 257<br />

Fig. 2. The layout of reaction cells used for the synthesis of arrays. The synthesis support<br />

is pressed to the reaction cell by a clamp. The inlet and outlet ports are attached to a DNA<br />

synthesizer. DNA synthesis on the support is achieved using the synthesizer to add and remove<br />

reagents from the reaction cell; the reagents flood the surface of the support. After the required<br />

sequence has been added the clamp is released and the cell moved and reclamped to allow<br />

further synthesis. Apparatus described in ref. 6 can be used to aid this process.<br />

leaves the oligonucleotides attached to the polypropylene via the initial, ammonia<br />

stable, phosphoramidite linkage to the 5′ end of the oligonucleotide and the amine<br />

of the polypropylene support.<br />

1.1.1. Arrays for Biallelic (SNP) Typing<br />

The simplest fabrication method involves the synthesis of each allele specific<br />

oligonucleotide (ASO) one at a time at a separate site on the surface. A patch of the<br />

first oligonucleotide is synthesized on the support using a cell to direct the synthesis<br />

reagents. The cell is then moved to a position adjacent to the first oligonucleotide and<br />

the second oligonucleotide synthesized. A long narrow cell (Fig. 2, left) minimizes

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