Abstract
With the increasing emergence of genome-wide analysis technologies (including comparative genomic hybridization (CGH)1, expression profiling on microarrays2, differential display (DD)3, subtractive hybridization, and representational difference analysis (RDA)4,5), there is frequently a need to amplify entire genomes or cDNAs by PCR to obtain enough material for comparisons among target and control samples. A major problem with PCR is that amplification occurs in a nonlinear manner and reproducibility is influenced by stray impurities6. As a result, when two complex DNA populations are amplified separately, the quantitative relationship between two genes after amplification is generally not the same as their relation before amplification7. Here we describe balanced PCR, a procedure that faithfully retains the difference among corresponding amplified genes by using a simple principle. Two distinct genomic DNA samples are tagged with oligonucleotides containing both a common and a unique DNA sequence. The genomic DNA samples are pooled and amplified in a single PCR tube using the common DNA tag. By mixing the two genomes, PCR loses the ability to discriminate among the different alleles and the influence of impurities is eliminated. The PCR-amplified pooled samples can be separated using the DNA tag unique to each individual genomic DNA sample. The principle of this method has been validated with synthetic DNA, genomic DNA, and cDNA applied on microarrays. By removing the bias of PCR, this method allows a balanced amplification of allelic fragments from two complex DNAs even after three sequential rounds of PCR. This balanced PCR approach should allow genetic analysis in minute laser-microdissected tissues, paraffin-embedded archived material, or single cells.
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Acknowledgements
We thank K. Ardlie (Genomics Collaborative) and D. Sgroi (Massachusetts General Hospital Department of Pathology) for helpful comments and suggestions. This work was supported in part by Genomics Collaborative (Cambridge, MA).
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Makrigiorgos, G., Chakrabarti, S., Zhang, Y. et al. A PCR-based amplification method retaining the quantitative difference between two complex genomes. Nat Biotechnol 20, 936–939 (2002). https://doi.org/10.1038/nbt724
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DOI: https://doi.org/10.1038/nbt724
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