Nucleic Acids Research, 1995, Vol. 23, No. 6 982-987
© 1995
CHEMISTRY |
High-throughput DNA synthesis in a multichannel format
Engineering Division, Lawrence Berkeley Laboratory, University of California Berkeley, CA 94720, USA
*To whom correspondence should be addressed
Received November 21, 1994. Revised January 24, 1995. Accepted January 24, 1995.
We describe an approach to high-throughput parallel DNA synthesis in which a multiwell format is used. The reactions are carried out in open wells using an argon ambient atmosphere to prevent reagent contamination. The controlled-pore glass beads which form the substrate for synthesis are held in individual wells with high-density polyethylene filter bottoms through which reagents are drawn into a vacuum manifold. The synthesis is carried out using direct reagent dispensing into the individual reaction wells. A computer controls the sequence in which reagents are dispensed and the timing of the periodic vacuum pulses required to synthesize the desired sequence. Experiments to date have demonstrated the viability of the approach for a variety of test sequences. Results obtained with HPLC analysis demonstrate coupling efficiencies as high as99.5% under optimized conditions. Use of the oligomers for DNA sequencing templates and as PCR primers has been demonstrated in production applications. The current instrument design consists of a series of discrete reaction chambers in a 12 channel module which can be multiplexed in a 12 x n format where n can be 18, i.e. 96 wells. A projected time interval for 12 parallel syntheses is 2.5 h, with 96 syntheses in 3.5 h. Becauseof the reduced volume of reagents required in the open well format, significant cost savings are projected.
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