Systematic screening of an arrayed cDNA library by PCR.
We have developed a PCR-based method for rapid and effective screening of arrayed cDNA libraries. This strategy directly addresses the limitations of conventional hybridization-based schemes and provides a more rapid, cost-effective, and sensitive method compatible with large-scale and routine cDNA clone recovery. To prepare arrayed libraries, 1-2 x 10(6) cDNA clones were propagated as individual plaques on solid medium in 24-well culture dishes at approximately 250 plaque-forming units per well. Phage suspensions were prepared from each well and transferred to a 96-well format. To screen the library, pools were generated that correspond to each individual 96-well plate and to each row and column within "blocks" of six plates each. Library screening for specific cDNA clones was conducted in a systematic and hierarchical fashion beginning with the plate pools. Next, the row/column pools corresponding to each positive plate pool were screened. Finally, isolated clones from within each positive well were identified by hybridization. We have applied this approach to the screening of an arrayed human brain cDNA library resulting in the recovery of cDNAs corresponding to > 25 genes and expressed sequence tags.
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