Stimulation and suppression of PCR-mediated recombination

Michael S.B. Judo, Andrew B. Wedel, Charles Wilson

Research output: Contribution to journalArticlepeer-review

200 Scopus citations


Recombination, or chimera formation, is known to occur between related template sequences present in a single PCR amplification. To characterize the conditions under which such recombinant amplification products form we monitored the exchange of sequence between two homologous templates carrying different restriction sites separated by 282 bp. Using a typical cycling program the rates of recombination between the two restriction sites were 1 and 7% using Tag and Vent polymerases respectively over 12 doublings. However, by using long elongation times and cycling only to the mid-point of the amplification recombination could be suppressed below visual detection with both polymerases. Conversely, cycling programs designed to promote incomplete primer elongation and subsequent template strand exchange stimulated recombination to > 20%.

Original languageEnglish (US)
Pages (from-to)1819-1825
Number of pages7
JournalNucleic acids research
Issue number7
StatePublished - Apr 1 1998

ASJC Scopus subject areas

  • Genetics


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